小学生四则运算APP核心代码公布

Mainactivity类：

package com.example.XXSCYS;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {
    public static final String FILENAME = "setting.set";
    public static final String FILENAME1 = "mima.set";
    public static final String FILENAME0 = "zancun.set"; 
    private EditText et; 
    private EditText et1;
    private EditText et2;
    TextView text;
    String c;
    OnClickListener listener1 = null;//监听器初始化
    OnClickListener listener2 = null;
    OnClickListener listener3 = null;
    OnClickListener listener4 = null;
    String a;
    String b;
    Button button1;//定义按钮
    TextView textView;
    TextView textView1;
    CheckBox CheckBox;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        text=(TextView) findViewById(R.id.editText3);
        b=readFiles0();    
        text.setText(b);
        //登录
        listener1 = new OnClickListener() {
            public void onClick(View v) {
                et=(EditText)findViewById(R.id.editText2);
                et1=(EditText)findViewById(R.id.editText3);
                c=readFiles1();
                a=readFiles();
                if(et.getText().toString().equals(c) && et1.getText().toString().equals(a)){
                     /*AlertDialog.Builder builder  = new Builder(MainActivity.this);
                     builder.setTitle("信息提醒" ) ;
                     builder.setMessage("密码输入正确！！" ) ;
                     builder.setPositiveButton("确定" ,  null );
                     */
                     et.setText("");
                     Intent intent = new Intent(MainActivity.this, onectivity.class);
                     startActivity(intent);
                     //builder.show(); 
                      }
                else{
                     AlertDialog.Builder builder  = new Builder(MainActivity.this);
                     builder.setTitle("信息提醒" ) ;
                     builder.setMessage("密码错误！请重新输入！") ;
                     builder.setPositiveButton("确定" ,  null );
                     builder.show(); 
                     et.setText("");
                    
                }
                
            }
        };
        
        //注册
        listener2 = new OnClickListener() {
            public void onClick(View v) {
                setTitle("注册");
                Intent intent1 = new Intent(MainActivity.this, zhuce.class);
                startActivity(intent1);
            }
        };
        
        //忘记密码
        listener3 = new OnClickListener() {
            public void onClick(View v) {
                 a=readFiles();
                 AlertDialog.Builder builder  = new Builder(MainActivity.this);
                 builder.setTitle("信息提醒" ) ;
                 builder.setMessage("请联系客服光大大设计者拿回密码！") ;
                 builder.setPositiveButton("确定" ,  null );
                 builder.show(); 
                 //et.setText("");
            }
        };
        
        //记住我
        listener4 = new OnClickListener() {
            public void onClick(View v) {
                et2=(EditText)findViewById(R.id.editText3);
                writeFiles0(et2.getText().toString());
            }
        };
        setContentView(R.layout.activity_main);
        button1 = (Button) findViewById(R.id.denglu);
        button1.setOnClickListener(listener1);
    
        textView = (TextView) findViewById(R.id.zhuce);
        textView.setOnClickListener(listener2);
        
        textView1 = (TextView) findViewById(R.id.wangji);
        textView1.setOnClickListener(listener3);
        
        CheckBox = (CheckBox) findViewById(R.id.jizhu);
        CheckBox.setOnClickListener(listener4);
        
        
    }
    
    // 保存文件暂时保存账号内容  
    private void writeFiles0(String content) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos0 = openFileOutput(FILENAME0,  
                    Context.MODE_PRIVATE);  
            fos0.write(content.getBytes());  
            fos0.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
    
    
    
    // 读取文件内容  
    private String readFiles0() {  
        String content = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME0);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content;  
    }  
    
    
    // 读取文件内容  
    private String readFiles() {  
        String content = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content;  
    }  
    
 // 读取文件内容  
    private String readFiles1() {  
        String content1 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME1);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content1 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content1;  
    }  
}

注册类：

package com.example.XXSCYS;  

  
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import android.annotation.SuppressLint;
import android.app.Activity;  
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;  
import android.view.View;  
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;  
import android.widget.TextView;



public class zhuce extends Activity{
    
    private EditText zhanghao; 
    private EditText mima;
    private EditText QRmima;
    private EditText nicheng;
    private Button Btn; 
    private int dengji=0;
    private int money=100;
    private int daoju=0;
    //private TextView contentView;  
    String xinxi;
    public static final String FILENAME = "setting.set";  
    public static final String FILENAME1 = "mima.set"; 
    public static final String FILENAME2 = "xinxi.set"; 
    public static final String FILENAME3 = "dengji.set"; 
    public static final String FILENAME4 = "money.set"; 
    public static final String FILENAME5 = "daoju.set"; 
    OnClickListener listener1 = null;//监听器初始化
    EditText editText;
    @SuppressLint("CutPasteId") @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.zhuce);  
        zhanghao = (EditText) findViewById(R.id.editText1);
        mima = (EditText) findViewById(R.id.editText2); 
        QRmima = (EditText) findViewById(R.id.editText3); 
        nicheng = (EditText) findViewById(R.id.editText4); 
        Btn = (Button) findViewById(R.id.button1);     
         
       // contentView = (TextView) findViewById(R.id.contentview);  
        Btn.setOnClickListener(new OperateOnClickListener());  
           }  
  
    class OperateOnClickListener implements OnClickListener {  
        @Override  
        public void onClick(View v) {  
             writeFiles(zhanghao.getText().toString());
             writeFiles1(mima.getText().toString());
             //writeFiles(QRmima.getText().toString());
             writeFiles2(nicheng.getText().toString());
             writeFiles3(""+dengji);
             writeFiles4(""+money);
             writeFiles5(""+daoju);
             xinxi=readFiles2();                                   
                     if(mima.getText().toString().equals(QRmima.getText().toString())){
                         AlertDialog.Builder builder  = new Builder(zhuce.this);
                          builder.setTitle("注册成功" ) ;
                          builder.setMessage("昵称"+xinxi+"
"+"等级"+dengji+"
"+"金币"+money ) ;
                          builder.setPositiveButton("确定" ,  null );
                          builder.show(); 
                          zhanghao.setText("");
                          mima.setText("");
                          QRmima.setText("");
                          nicheng.setText("");
                         System.out.println(getFilesDir());  
                         zhuce.this.finish();
                     }
                     else{
                          AlertDialog.Builder builder  = new Builder(zhuce.this);
                          builder.setTitle("信息提醒" ) ;
                          builder.setMessage("密码确认不符！请重新输入！") ;
                          builder.setPositiveButton("确定" ,  null );
                          builder.show(); 
                          mima.setText("");
                          QRmima.setText("");
                     }                      
                      
        }  
    }
      
  
    // 保存文件内容(账号)  
    private void writeFiles(String content) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos = openFileOutput(FILENAME,  
                    Context.MODE_PRIVATE);  
            fos.write(content.getBytes());  
            fos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
 // 保存文件内容 (密码)
    private void writeFiles1(String content1) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos1 = openFileOutput(FILENAME1,  
                    Context.MODE_PRIVATE);  
            fos1.write(content1.getBytes());  
            fos1.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
    
 // 保存文件内容  (昵称)
    private void writeFiles2(String content2) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos2 = openFileOutput(FILENAME2,  
                    Context.MODE_PRIVATE);  
            fos2.write(content2.getBytes());  
            fos2.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
    
 // 保存文件内容  （等级）
    private void writeFiles3(String content3) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos3 = openFileOutput(FILENAME3,  
                    Context.MODE_PRIVATE);  
            fos3.write(content3.getBytes());  
            fos3.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
    
 // 保存文件内容  （金币）
    private void writeFiles4(String content4) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos4 = openFileOutput(FILENAME4,  
                    Context.MODE_PRIVATE);  
            fos4.write(content4.getBytes());  
            fos4.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
    // 读取昵称  
    private String readFiles2() {  
        String content2 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME2);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content2 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content2;  
    }  
 // 保存文件内容  
    private void writeFiles5(String content5) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos5 = openFileOutput(FILENAME5,  
                    Context.MODE_PRIVATE);  
            fos5.write(content5.getBytes());  
            fos5.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
  
}  

登陆类（启动页面）：

package com.example.XXSCYS;

import android.annotation.SuppressLint;
import android.app.TabActivity;
import android.content.Intent;

import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.PopupMenu;
import android.widget.RadioGroup;
import android.widget.TabHost;
import android.widget.RadioGroup.OnCheckedChangeListener;

public class onectivity extends  TabActivity implements OnCheckedChangeListener{
        private RadioGroup mainTab;
        private TabHost tabhost;
        private Intent a;
        private Intent xinxi;
        private Intent shangcheng;
        @SuppressLint("NewApi") @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            requestWindowFeature(Window.FEATURE_NO_TITLE);
            setContentView(R.layout.onectivity);
            final Button btn=(Button)findViewById(R.id.dati);
            final PopupMenu popupMenu=new PopupMenu(this, btn);
            popupMenu.inflate(R.menu.main);    
    
            
            btn.setOnClickListener(new View.OnClickListener() {
                
                @Override
                public void onClick(View arg0) {
                    // TODO Auto-generated method stub
                    popupMenu.show();                    
                }
            });
            
          //菜单单击响应
            popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener(){
               @Override
               public  boolean onMenuItemClick(MenuItem item){
                   
                   switch(item.getItemId()){
                   case R.id.jiafa:
                        setTitle("加法");
                    Intent intent1 = new Intent(onectivity.this, jiafa.class);
                    startActivity(intent1);
                       break;
                   case R.id.jianfa:
                       setTitle("减法");
                    Intent intent2 = new Intent(onectivity.this, jianfa.class);
                    startActivity(intent2);
                       break;
                   case R.id.chengfa:
                       setTitle("乘法");
                    Intent intent3 = new Intent(onectivity.this, chengfa.class);
                    startActivity(intent3);
                       break;
                   case R.id.chufa:
                       setTitle("除法");
                    Intent intent4 = new Intent(onectivity.this, chufa.class);
                    startActivity(intent4);
                       break;
                   case R.id.hunhe:
                       setTitle("混合运算");
                    Intent intent5 = new Intent(onectivity.this, hunhe.class);
                    startActivity(intent5);
                       break;
                   }
                   return false;
            }
        });
    
         
            mainTab=(RadioGroup)findViewById(R.id.main_tab);
            mainTab.setOnCheckedChangeListener(this);
            tabhost = getTabHost();
            
            a= new Intent(this, a.class);
            tabhost.addTab(tabhost.newTabSpec("a")
                    .setIndicator(getResources().getString(R.string.xinxi), getResources().getDrawable(R.drawable.xinxi))
                    .setContent(a));
            
            xinxi= new Intent(this, xinxi.class);
            tabhost.addTab(tabhost.newTabSpec("xinxi")
                    .setIndicator(getResources().getString(R.string.xinxi), getResources().getDrawable(R.drawable.xinxi))
                    .setContent(xinxi));
             
            shangcheng = new Intent(this,shangcheng.class);
            tabhost.addTab(tabhost.newTabSpec("shangcheng")
                    .setIndicator(getResources().getString(R.string.shangcheng), getResources().getDrawable(R.drawable.shangcheng))
                    .setContent(shangcheng));
             
            
        }
        
    
     @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            switch(checkedId){
           
            case R.id.xinxi:
                this.tabhost.setCurrentTabByTag("xinxi");
                break;
            case R.id.shangcheng:
                this.tabhost.setCurrentTabByTag("shangcheng");               
                break;
            case R.id.tuichu:
                onectivity.this.finish();
                break;
            }
        }  
    
}

加法类：

package com.example.XXSCYS;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class jiafa extends Activity {

    public static final String FILENAME3 = "dengji.set"; 
    public static final String FILENAME4 = "money.set"; 
    public static final String FILENAME5 = "daoju.set";
    private int money;
    private float dengji;
    private int daoju;
   
    
    private EditText et;
    TextView text;
    OnClickListener listener1 = null;//监听器初始化
    OnClickListener listener2 = null;
    OnClickListener listener3 = null;
    OnClickListener listener4 = null;
    Button button1;//定义按钮
    Button button2;
    Button button3;
    Button button4;
    double c;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);;
        setContentView(R.layout.jiafa);
         
        listener1 = new OnClickListener() {
            public void onClick(View v) {
                int a=(int)(Math.random()*(-5))+10;
                int b=(int)(Math.random()*(-5))+20;
                 text=(TextView) findViewById(R.id.editText3);
                 text.setText(a+"+"+b+"=?");
                 c=a+b;
            }
     };
     
     listener2 = new OnClickListener() {                
            public void onClick(View v) {
                String m;
                String n;
                m=readFiles4(); 
                 n=readFiles3(); 
                 final int i = Integer.parseInt(m); 
                 final float j = Float.parseFloat(n); 
            et=(EditText)findViewById(R.id.editText2);
            if(Integer.parseInt(et.getText().toString())==c){
                 AlertDialog.Builder builder  = new Builder(jiafa.this);
                 builder.setTitle("信息提醒" ) ;
                 builder.setMessage("恭喜啦，回答正确！！" ) ;
                 builder.setPositiveButton("确定" ,  null );
                 builder.show(); 
                 et.setText("");
                 text.setText("");
                 money=i+10;
                 dengji=(float) (j+0.1);
                  }
            else{
                AlertDialog.Builder builder  = new Builder(jiafa.this);
                 builder.setTitle("信息提醒" ) ;
                 builder.setMessage("很遗憾，回答错误！加油哦！正确答案为："+c ) ;
                 builder.setPositiveButton("确定" ,  null );
                 builder.show(); 
                 et.setText("");
                 text.setText("");
                 money=i-5;
            }
            writeFiles4(""+money);
             writeFiles3(""+dengji);
        }
     };
     
     listener3 = new OnClickListener() {
            public void onClick(View v) {
                int a=(int)(Math.random()*(-5))+10;
                int b=(int)(Math.random()*(-5))+20;
                 text=(TextView) findViewById(R.id.editText3);
                 text.setText(a+"+"+b+"=?");
                 c=a+b;
            }
     };
     
     listener4 = new OnClickListener() {
            public void onClick(View v) {
                 String o;
                 o=readFiles5(); 
                 final int p = Integer.parseInt(o); 
                 if(o.equals("0")) {
                     AlertDialog.Builder builder  = new Builder(jiafa.this);
                     builder.setTitle("信息提醒" ) ;
                     builder.setMessage("您的道具余额不足，请去商城购买道具！" ) ;
                     builder.setPositiveButton("确定" ,  null );
                     builder.show();
                     }
                 else{                                     
                     AlertDialog.Builder builder  = new Builder(jiafa.this);
                     builder.setTitle("信息提醒" ) ;
                     builder.setMessage("正确答案为："+c+"
"+"您用掉了一个道具" ) ;
                     builder.setPositiveButton("确定" ,  null );
                     builder.show(); 
                     daoju=p-1;
                     writeFiles5(""+daoju);
                     }
            }
     };
     setContentView(R.layout.jiafa);
        button1 = (Button) findViewById(R.id.start);
        button1.setOnClickListener(listener1);

        button2 = (Button) findViewById(R.id.tijiao);
        button2.setOnClickListener(listener2);
        
        button3 = (Button) findViewById(R.id.next);
        button3.setOnClickListener(listener3);
        

        button4 = (Button) findViewById(R.id.daoju);
        button4.setOnClickListener(listener4);

    }
    
    // 读取等级
    private String readFiles3() {  
        String content3 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME3);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content3 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content3;  
    }  
 // 保存文件内容  
    private void writeFiles3(String content3) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos3 = openFileOutput(FILENAME3,  
                    Context.MODE_PRIVATE);  
            fos3.write(content3.getBytes());  
            fos3.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
    
    // 读取金币
    private String readFiles4() {  
        String content4 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME4);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content4 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content4;  
    }  
 // 保存文件内容  
    private void writeFiles4(String content4) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos4 = openFileOutput(FILENAME4,  
                    Context.MODE_PRIVATE);  
            fos4.write(content4.getBytes());  
            fos4.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
 // 读取道具数
    private String readFiles5() {  
        String content5 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME5);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content5 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content5;  
    }  
 // 保存文件内容  
    private void writeFiles5(String content5) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos5 = openFileOutput(FILENAME5,  
                    Context.MODE_PRIVATE);  
            fos5.write(content5.getBytes());  
            fos5.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
}

减法类:

package com.example.XXSCYS;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class jianfa extends Activity {

    public static final String FILENAME3 = "dengji.set"; 
    public static final String FILENAME4 = "money.set"; 
    public static final String FILENAME5 = "daoju.set";
    private int money;
    private float dengji;
    private int daoju;
   
    
    private EditText et;
    TextView text;
    OnClickListener listener1 = null;//监听器初始化
    OnClickListener listener2 = null;
    OnClickListener listener3 = null;
    OnClickListener listener4 = null;
    Button button1;//定义按钮
    Button button2;
    Button button3;
    Button button4;
    double c;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);;
        setContentView(R.layout.jiafa);
         
        listener1 = new OnClickListener() {
            public void onClick(View v) {
                int a=(int)(Math.random()*(-5))+20;
                int b=(int)(Math.random()*(-5))+10;
                 text=(TextView) findViewById(R.id.editText3);
                 text.setText(a+"-"+b+"=?");
                 c=a-b;
            }
     };
     
     listener2 = new OnClickListener() {                
            public void onClick(View v) {
                String m;
                String n;
                m=readFiles4(); 
                 n=readFiles3(); 
                 final int i = Integer.parseInt(m); 
                 final float j = Float.parseFloat(n); 
            et=(EditText)findViewById(R.id.editText2);
            if(Integer.parseInt(et.getText().toString())==c){
                 AlertDialog.Builder builder  = new Builder(jianfa.this);
                 builder.setTitle("信息提醒" ) ;
                 builder.setMessage("恭喜啦，回答正确！！" ) ;
                 builder.setPositiveButton("确定" ,  null );
                 builder.show(); 
                 et.setText("");
                 text.setText("");
                 money=i+10;
                 dengji=(float) (j+0.1);
                  }
            else{
                AlertDialog.Builder builder  = new Builder(jianfa.this);
                 builder.setTitle("信息提醒" ) ;
                 builder.setMessage("很遗憾，回答错误！加油哦！正确答案为："+c ) ;
                 builder.setPositiveButton("确定" ,  null );
                 builder.show(); 
                 et.setText("");
                 text.setText("");
                 money=i-5;
            }
            writeFiles4(""+money);
             writeFiles3(""+dengji);
        }
     };
     
     listener3 = new OnClickListener() {
            public void onClick(View v) {
                int a=(int)(Math.random()*(-5))+20;
                int b=(int)(Math.random()*(-5))+10;
                 text=(TextView) findViewById(R.id.editText3);
                 text.setText(a+"-"+b+"=?");
                 c=a-b;
            }
     };
     
     listener4 = new OnClickListener() {
            public void onClick(View v) {
                 String o;
                 o=readFiles5(); 
                 final int p = Integer.parseInt(o); 
                 if(o.equals("0")) {
                     AlertDialog.Builder builder  = new Builder(jianfa.this);
                     builder.setTitle("信息提醒" ) ;
                     builder.setMessage("您的道具余额不足，请去商城购买道具！" ) ;
                     builder.setPositiveButton("确定" ,  null );
                     builder.show();
                     }
                 else{                                     
                     AlertDialog.Builder builder  = new Builder(jianfa.this);
                     builder.setTitle("信息提醒" ) ;
                     builder.setMessage("正确答案为："+c+"
"+"您用掉了一个道具" ) ;
                     builder.setPositiveButton("确定" ,  null );
                     builder.show(); 
                     daoju=p-1;
                     writeFiles5(""+daoju);
                     }
            }
     };
     setContentView(R.layout.jiafa);
        button1 = (Button) findViewById(R.id.start);
        button1.setOnClickListener(listener1);

        button2 = (Button) findViewById(R.id.tijiao);
        button2.setOnClickListener(listener2);
        
        button3 = (Button) findViewById(R.id.next);
        button3.setOnClickListener(listener3);
        

        button4 = (Button) findViewById(R.id.daoju);
        button4.setOnClickListener(listener4);

    }
    
    // 读取等级
    private String readFiles3() {  
        String content3 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME3);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content3 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content3;  
    }  
 // 保存文件内容  
    private void writeFiles3(String content3) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos3 = openFileOutput(FILENAME3,  
                    Context.MODE_PRIVATE);  
            fos3.write(content3.getBytes());  
            fos3.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
    
    // 读取金币
    private String readFiles4() {  
        String content4 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME4);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content4 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content4;  
    }  
 // 保存文件内容  
    private void writeFiles4(String content4) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos4 = openFileOutput(FILENAME4,  
                    Context.MODE_PRIVATE);  
            fos4.write(content4.getBytes());  
            fos4.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
 // 读取道具数
    private String readFiles5() {  
        String content5 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME5);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content5 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content5;  
    }  
 // 保存文件内容  
    private void writeFiles5(String content5) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos5 = openFileOutput(FILENAME5,  
                    Context.MODE_PRIVATE);  
            fos5.write(content5.getBytes());  
            fos5.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
}

乘法类：

package com.example.XXSCYS;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class chengfa extends Activity {

    public static final String FILENAME3 = "dengji.set"; 
    public static final String FILENAME4 = "money.set"; 
    public static final String FILENAME5 = "daoju.set";
    private int money;
    private float dengji;
    private int daoju;
   
    
    private EditText et;
    TextView text;
    OnClickListener listener1 = null;//监听器初始化
    OnClickListener listener2 = null;
    OnClickListener listener3 = null;
    OnClickListener listener4 = null;
    Button button1;//定义按钮
    Button button2;
    Button button3;
    Button button4;
    double c;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);;
        setContentView(R.layout.jiafa);
         
        listener1 = new OnClickListener() {
            public void onClick(View v) {
                int a=(int)(Math.random()*(-5))+10;
                int b=(int)(Math.random()*(-5))+20;
                 text=(TextView) findViewById(R.id.editText3);
                 text.setText(a+"*"+b+"=?");
                 c=a*b;
            }
     };
     
     listener2 = new OnClickListener() {                
            public void onClick(View v) {
                String m;
                String n;
                m=readFiles4(); 
                 n=readFiles3(); 
                 final int i = Integer.parseInt(m); 
                 final float j = Float.parseFloat(n); 
            et=(EditText)findViewById(R.id.editText2);
            if(Integer.parseInt(et.getText().toString())==c){
                 AlertDialog.Builder builder  = new Builder(chengfa.this);
                 builder.setTitle("信息提醒" ) ;
                 builder.setMessage("恭喜啦，回答正确！！" ) ;
                 builder.setPositiveButton("确定" ,  null );
                 builder.show(); 
                 et.setText("");
                 text.setText("");
                 money=i+10;
                 dengji=(float) (j+0.1);
                  }
            else{
                AlertDialog.Builder builder  = new Builder(chengfa.this);
                 builder.setTitle("信息提醒" ) ;
                 builder.setMessage("很遗憾，回答错误！加油哦！正确答案为："+c ) ;
                 builder.setPositiveButton("确定" ,  null );
                 builder.show(); 
                 et.setText("");
                 text.setText("");
                 money=i-5;
            }
            writeFiles4(""+money);
             writeFiles3(""+dengji);
        }
     };
     
     listener3 = new OnClickListener() {
            public void onClick(View v) {
                int a=(int)(Math.random()*(-5))+10;
                int b=(int)(Math.random()*(-5))+20;
                 text=(TextView) findViewById(R.id.editText3);
                 text.setText(a+"*"+b+"=?");
                 c=a*b;
            }
     };
     
     listener4 = new OnClickListener() {
            public void onClick(View v) {
                 String o;
                 o=readFiles5(); 
                 final int p = Integer.parseInt(o); 
                 if(o.equals("0")) {
                     AlertDialog.Builder builder  = new Builder(chengfa.this);
                     builder.setTitle("信息提醒" ) ;
                     builder.setMessage("您的道具余额不足，请去商城购买道具！" ) ;
                     builder.setPositiveButton("确定" ,  null );
                     builder.show();
                     }
                 else{                                     
                     AlertDialog.Builder builder  = new Builder(chengfa.this);
                     builder.setTitle("信息提醒" ) ;
                     builder.setMessage("正确答案为："+c+"
"+"您用掉了一个道具" ) ;
                     builder.setPositiveButton("确定" ,  null );
                     builder.show(); 
                     daoju=p-1;
                     writeFiles5(""+daoju);
                     }
            }
     };
     setContentView(R.layout.jiafa);
        button1 = (Button) findViewById(R.id.start);
        button1.setOnClickListener(listener1);

        button2 = (Button) findViewById(R.id.tijiao);
        button2.setOnClickListener(listener2);
        
        button3 = (Button) findViewById(R.id.next);
        button3.setOnClickListener(listener3);
        

        button4 = (Button) findViewById(R.id.daoju);
        button4.setOnClickListener(listener4);

    }
    
    // 读取等级
    private String readFiles3() {  
        String content3 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME3);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content3 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content3;  
    }  
 // 保存文件内容  
    private void writeFiles3(String content3) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos3 = openFileOutput(FILENAME3,  
                    Context.MODE_PRIVATE);  
            fos3.write(content3.getBytes());  
            fos3.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
    
    // 读取金币
    private String readFiles4() {  
        String content4 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME4);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content4 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content4;  
    }  
 // 保存文件内容  
    private void writeFiles4(String content4) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos4 = openFileOutput(FILENAME4,  
                    Context.MODE_PRIVATE);  
            fos4.write(content4.getBytes());  
            fos4.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
 // 读取道具数
    private String readFiles5() {  
        String content5 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME5);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content5 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content5;  
    }  
 // 保存文件内容  
    private void writeFiles5(String content5) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos5 = openFileOutput(FILENAME5,  
                    Context.MODE_PRIVATE);  
            fos5.write(content5.getBytes());  
            fos5.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
}

除法类：

package com.example.XXSCYS;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class chufa extends Activity {

    public static final String FILENAME3 = "dengji.set"; 
    public static final String FILENAME4 = "money.set"; 
    public static final String FILENAME5 = "daoju.set";
    private int money;
    private float dengji;
    private int daoju;
   
    
    private EditText et;
    TextView text;
    OnClickListener listener1 = null;//监听器初始化
    OnClickListener listener2 = null;
    OnClickListener listener3 = null;
    OnClickListener listener4 = null;
    Button button1;//定义按钮
    Button button2;
    Button button3;
    Button button4;
    double c;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);;
        setContentView(R.layout.jiafa);
         
        listener1 = new OnClickListener() {
            public void onClick(View v) {
                int a=(int)(Math.random()*(-5))+20;
                int b=(int)(Math.random()*(-5))+10;
                 text=(TextView) findViewById(R.id.editText3);
                 text.setText(a+"/"+b+"=?");
                 c=a/b;
            }
     };
     
     listener2 = new OnClickListener() {                
            public void onClick(View v) {
                String m;
                String n;
                m=readFiles4(); 
                 n=readFiles3(); 
                 final int i = Integer.parseInt(m); 
                 final float j = Float.parseFloat(n); 
            et=(EditText)findViewById(R.id.editText2);
            if(Integer.parseInt(et.getText().toString())==c){
                 AlertDialog.Builder builder  = new Builder(chufa.this);
                 builder.setTitle("信息提醒" ) ;
                 builder.setMessage("恭喜啦，回答正确！！" ) ;
                 builder.setPositiveButton("确定" ,  null );
                 builder.show(); 
                 et.setText("");
                 text.setText("");
                 money=i+10;
                 dengji=(float) (j+0.1);
                  }
            else{
                AlertDialog.Builder builder  = new Builder(chufa.this);
                 builder.setTitle("信息提醒" ) ;
                 builder.setMessage("很遗憾，回答错误！加油哦！正确答案为："+c ) ;
                 builder.setPositiveButton("确定" ,  null );
                 builder.show(); 
                 et.setText("");
                 text.setText("");
                 money=i-5;
            }
            writeFiles4(""+money);
             writeFiles3(""+dengji);
        }
     };
     
     listener3 = new OnClickListener() {
            public void onClick(View v) {
                int a=(int)(Math.random()*(-5))+20;
                int b=(int)(Math.random()*(-5))+10;
                 text=(TextView) findViewById(R.id.editText3);
                 text.setText(a+"/"+b+"=?");
                 c=a/b;
            }
     };
     
     listener4 = new OnClickListener() {
            public void onClick(View v) {
                 String o;
                 o=readFiles5(); 
                 final int p = Integer.parseInt(o); 
                 if(o.equals("0")) {
                     AlertDialog.Builder builder  = new Builder(chufa.this);
                     builder.setTitle("信息提醒" ) ;
                     builder.setMessage("您的道具余额不足，请去商城购买道具！" ) ;
                     builder.setPositiveButton("确定" ,  null );
                     builder.show();
                     }
                 else{                                     
                     AlertDialog.Builder builder  = new Builder(chufa.this);
                     builder.setTitle("信息提醒" ) ;
                     builder.setMessage("正确答案为："+c+"
"+"您用掉了一个道具" ) ;
                     builder.setPositiveButton("确定" ,  null );
                     builder.show(); 
                     daoju=p-1;
                     writeFiles5(""+daoju);
                     }
            }
     };
     setContentView(R.layout.jiafa);
        button1 = (Button) findViewById(R.id.start);
        button1.setOnClickListener(listener1);

        button2 = (Button) findViewById(R.id.tijiao);
        button2.setOnClickListener(listener2);
        
        button3 = (Button) findViewById(R.id.next);
        button3.setOnClickListener(listener3);
        

        button4 = (Button) findViewById(R.id.daoju);
        button4.setOnClickListener(listener4);

    }
    
    // 读取等级
    private String readFiles3() {  
        String content3 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME3);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content3 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content3;  
    }  
 // 保存文件内容  
    private void writeFiles3(String content3) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos3 = openFileOutput(FILENAME3,  
                    Context.MODE_PRIVATE);  
            fos3.write(content3.getBytes());  
            fos3.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
    
    // 读取金币
    private String readFiles4() {  
        String content4 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME4);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content4 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content4;  
    }  
 // 保存文件内容  
    private void writeFiles4(String content4) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos4 = openFileOutput(FILENAME4,  
                    Context.MODE_PRIVATE);  
            fos4.write(content4.getBytes());  
            fos4.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
 // 读取道具数
    private String readFiles5() {  
        String content5 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME5);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content5 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content5;  
    }  
 // 保存文件内容  
    private void writeFiles5(String content5) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos5 = openFileOutput(FILENAME5,  
                    Context.MODE_PRIVATE);  
            fos5.write(content5.getBytes());  
            fos5.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
}

混合运算类：

package com.example.XXSCYS;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class hunhe extends Activity {

    public static final String FILENAME3 = "dengji.set"; 
    public static final String FILENAME4 = "money.set"; 
    public static final String FILENAME5 = "daoju.set";
    private int money;
    private float dengji;
    private int daoju;
   
    int a,x,y,o,p,j1,j2;
    float z,q,s1,s2,f,n;
    private EditText et;
    TextView text;
    OnClickListener listener1 = null;//监听器初始化
    OnClickListener listener2 = null;
    OnClickListener listener3 = null;
    OnClickListener listener4 = null;
    Button button1;//定义按钮
    Button button2;
    Button button3;
    Button button4;
    //double c;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);;
        setContentView(R.layout.jiafa);
        
        listener1 = new OnClickListener() {
            public void onClick(View v) {
                text=(TextView) findViewById(R.id.editText3);
                 x=(int)(1+Math.random()*100);
                 y=(int)(1+Math.random()*100);

                 o=(int)(1+Math.random()*100);
                 p=(int)(1+Math.random()*100);

                 a=(int)(1+Math.random()*16);

                 j1=x*y;
                 j2=o*p;
                 s1=x/y;
                 s2=o/p;
                switch (a) {
                case 1:
                    text.setText("("+x+"+"+y+")"+"*"+"("+o+"+"+p+")"+"=");
                    z=x+y;
                    q=o+p;
                    f=z*q;
                    break;
                case 2:
                    z=x-y;
                    if(z<0)            
                    {text.setText("("+y+"-"+x+")"+"*"+"("+o+"+"+p+")"+"=");
                    z=-z;
                    }
                    else {
                        text.setText("("+x+"-"+y+")"+"*"+"("+o+"+"+p+")"+"=");

                    }
                    q=o+p;
                    f=z*q;
             
                    break;
                case 3:
                    z=x-y;
                    if(z>0)
                     text.setText("("+x+"-"+y+")"+"/"+"("+o+"+"+p+")"+"=");
                    else {
                         text.setText("("+y+"-"+x+")"+"/"+"("+o+"+"+p+")"+"=");
                         z=-z;
                    }
                    q=o+p;
                    f=q*z;
                
                    break;    
                case 4:
                    text.setText("("+x+"+"+y+")"+"/"+"("+o+"+"+p+")"+"=");
                    f=(x+y)/(o+p);
                    
                    break;
                case 5:
                    if(o==p)
                        o++;
                    z=x-y;
                    q=o-p;
                        
                    if(z>0 && q>0)
                       text.setText("("+x+"-"+y+")"+"/"+"("+o+"-"+p+")"+"=");
                    if(z>0 && q<0)
                    {    text.setText("("+x+"-"+y+")"+"/"+"("+p+"-"+o+")"+"=");
                    q=-q;
                    }
                    if(z<0 && q>0)
                        {text.setText("("+y+"-"+x+")"+"/"+"("+o+"-"+p+")"+"=");
                        z=-z;
                        }
                    if(z<0 && q<0)
                    {    text.setText("("+y+"-"+x+")"+"/"+"("+p+"-"+o+")"+"=");    
                       z=-z;
                       q=-q;
                    }
                    f=z/q;
                    
                    break;
                case 6:
                    q=o-p;
                    z=x+y;
                    if(q>0)
                    text.setText("("+x+"+"+y+")"+"/"+"("+o+"-"+p+")"+"=");
                    else
                        {text.setText("("+x+"+"+y+")"+"/"+"("+p+"-"+o+")"+"=");
                        q=-q;
                        }
                    f=z/q;
                    
                    break;
                case 7:
                    z=x-y;
                    q=o+p;
                    if(z>0)
                    text.setText("("+x+"-"+y+")"+"*"+"("+o+"+"+p+")"+"=");
                    else
                    {
                        text.setText("("+y+"-"+x+")"+"*"+"("+o+"+"+p+")"+"=");
                        z=-z;
                    }
                    f=z*q;
                    
                    break;
                case 8:
                    q=o-p;
                    z=x+y;
                    if(q>0)
                    text.setText("("+x+"+"+y+")"+"*"+"("+o+"-"+p+")"+"=");
                    else
                    {
                        text.setText("("+x+"+"+y+")"+"*"+"("+o+"-"+p+")"+"=");
                        q=-q;
                    }
                    f=z*q;
                    
                    break;

                case 9:
                    if(j1>j2)
                    {text.setText(x+"*"+y+"-"+o+"*"+p+"=");
                    f=j1-j2;
                    }
                    else
                        {
                        text.setText(o+"*"+p+"-"+x+"*"+y+"=");    
                        f=j2-j1;
                        }
                    
                    break;
                case 10:
                    if(j1>s2)
                        {
                        text.setText(x+"*"+y+"-"+o+"/"+p+"=");
                        f=j1-s2;
                        }
                    else
                        {
                        text.setText(o+"/"+p+"-"+x+"*"+y+"=");    
                        f=s2-j1;
                        }
                    
                    break;
                case 11:
                    if(s1>j2)
                    {
                        text.setText(x+"/"+y+"-"+o+"*"+p+"=");
                        f=s1-j2;
                    }
                    else
                        {
                        text.setText(o+"*"+p+"-"+x+"/"+y+"=");
                        f=j2-s1;
                        }
                    
                    
                    break;
                case 12:
                    f=s1-s2;
                    if(f>0)
                    {
                    text.setText(x+"/"+y+"-"+o+"/"+p+"=");

                    }
                    if(f<0)
                    {
                        text.setText(o+"/"+p+"-"+x+"/"+y+"=");
                        f=s2-s1;
                    }
                    
                    
                    break;
                case 13:
                    text.setText(x+"*"+y+"+"+o+"*"+p+"=");
                    f=j1+j2;
                    
                    
                    break;
                case 14:
                    text.setText(x+"*"+y+"+"+o+"/"+p+"=");
                    f=1+s2;
                    
                    
                    break;
                case 15:
                    text.setText(x+"/"+y+"+"+o+"*"+p+"=");
                    f=s1+j2;
                    
                    
                    break;
                case 16:
                    text.setText(x+"/"+y+"+"+o+"/"+p+"=");
                    f=s2+s1;
                    
                    break;
                default:
                    break;
                }

            }
     };
     
     listener2 = new OnClickListener() {                
            public void onClick(View v) {
                String m;
                String n;
                m=readFiles4(); 
                 n=readFiles3(); 
                 final int i = Integer.parseInt(m); 
                 final float j = Float.parseFloat(n); 
            et=(EditText)findViewById(R.id.editText2);
            if(Integer.parseInt(et.getText().toString())==f){
                 AlertDialog.Builder builder  = new Builder(hunhe.this);
                 builder.setTitle("信息提醒" ) ;
                 builder.setMessage("恭喜啦，回答正确！！" ) ;
                 builder.setPositiveButton("确定" ,  null );
                 builder.show(); 
                 et.setText("");
                 text.setText("");
                 money=i+10;
                 dengji=(float) (j+0.1);
                  }
            else{
                AlertDialog.Builder builder  = new Builder(hunhe.this);
                 builder.setTitle("信息提醒" ) ;
                 builder.setMessage("很遗憾，回答错误！加油哦！正确答案为："+f ) ;
                 builder.setPositiveButton("确定" ,  null );
                 builder.show(); 
                 et.setText("");
                 text.setText("");
                 money=i-5;
            }
            writeFiles4(""+money);
             writeFiles3(""+dengji);
        }
     };
     
     listener3 = new OnClickListener() {
            public void onClick(View v) {
                text=(TextView) findViewById(R.id.editText3);
                x=(int)(1+Math.random()*100);
                 y=(int)(1+Math.random()*100);

                 o=(int)(1+Math.random()*100);
                 p=(int)(1+Math.random()*100);

                 a=(int)(1+Math.random()*16);

                 j1=x*y;
                 j2=o*p;
                 s1=x/y;
                 s2=o/p;
                switch (a) {
                case 1:
                    text.setText("("+x+"+"+y+")"+"*"+"("+o+"+"+p+")"+"=");
                    z=x+y;
                    q=o+p;
                    f=z*q;
                    break;
                case 2:
                    z=x-y;
                    if(z<0)            
                    {text.setText("("+y+"-"+x+")"+"*"+"("+o+"+"+p+")"+"=");
                    z=-z;
                    }
                    else {
                        text.setText("("+x+"-"+y+")"+"*"+"("+o+"+"+p+")"+"=");

                    }
                    q=o+p;
                    f=z*q;
             
                    break;
                case 3:
                    z=x-y;
                    if(z>0)
                     text.setText("("+x+"-"+y+")"+"/"+"("+o+"+"+p+")"+"=");
                    else {
                         text.setText("("+y+"-"+x+")"+"/"+"("+o+"+"+p+")"+"=");
                         z=-z;
                    }
                    q=o+p;
                    f=q*z;
                
                    break;    
                case 4:
                    text.setText("("+x+"+"+y+")"+"/"+"("+o+"+"+p+")"+"=");
                    f=(x+y)/(o+p);
                    
                    break;
                case 5:
                    if(o==p)
                        o++;
                    z=x-y;
                    q=o-p;
                        
                    if(z>0 && q>0)
                       text.setText("("+x+"-"+y+")"+"/"+"("+o+"-"+p+")"+"=");
                    if(z>0 && q<0)
                    {    text.setText("("+x+"-"+y+")"+"/"+"("+p+"-"+o+")"+"=");
                    q=-q;
                    }
                    if(z<0 && q>0)
                        {text.setText("("+y+"-"+x+")"+"/"+"("+o+"-"+p+")"+"=");
                        z=-z;
                        }
                    if(z<0 && q<0)
                    {    text.setText("("+y+"-"+x+")"+"/"+"("+p+"-"+o+")"+"=");    
                       z=-z;
                       q=-q;
                    }
                    f=z/q;
                    
                    break;
                case 6:
                    q=o-p;
                    z=x+y;
                    if(q>0)
                    text.setText("("+x+"+"+y+")"+"/"+"("+o+"-"+p+")"+"=");
                    else
                        {text.setText("("+x+"+"+y+")"+"/"+"("+p+"-"+o+")"+"=");
                        q=-q;
                        }
                    f=z/q;
                    
                    break;
                case 7:
                    z=x-y;
                    q=o+p;
                    if(z>0)
                    text.setText("("+x+"-"+y+")"+"*"+"("+o+"+"+p+")"+"=");
                    else
                    {
                        text.setText("("+y+"-"+x+")"+"*"+"("+o+"+"+p+")"+"=");
                        z=-z;
                    }
                    f=z*q;
                    
                    break;
                case 8:
                    q=o-p;
                    z=x+y;
                    if(q>0)
                    text.setText("("+x+"+"+y+")"+"*"+"("+o+"-"+p+")"+"=");
                    else
                    {
                        text.setText("("+x+"+"+y+")"+"*"+"("+o+"-"+p+")"+"=");
                        q=-q;
                    }
                    f=z*q;
                    
                    break;

                case 9:
                    if(j1>j2)
                    {text.setText(x+"*"+y+"-"+o+"*"+p+"=");
                    f=j1-j2;
                    }
                    else
                        {
                        text.setText(o+"*"+p+"-"+x+"*"+y+"=");    
                        f=j2-j1;
                        }
                    
                    break;
                case 10:
                    if(j1>s2)
                        {
                        text.setText(x+"*"+y+"-"+o+"/"+p+"=");
                        f=j1-s2;
                        }
                    else
                        {
                        text.setText(o+"/"+p+"-"+x+"*"+y+"=");    
                        f=s2-j1;
                        }
                    
                    break;
                case 11:
                    if(s1>j2)
                    {
                        text.setText(x+"/"+y+"-"+o+"*"+p+"=");
                        f=s1-j2;
                    }
                    else
                        {
                        text.setText(o+"*"+p+"-"+x+"/"+y+"=");
                        f=j2-s1;
                        }
                    
                    
                    break;
                case 12:
                    f=s1-s2;
                    if(f>0)
                    {
                    text.setText(x+"/"+y+"-"+o+"/"+p+"=");

                    }
                    if(f<0)
                    {
                        text.setText(o+"/"+p+"-"+x+"/"+y+"=");
                        f=s2-s1;
                    }
                    
                    
                    break;
                case 13:
                    text.setText(x+"*"+y+"+"+o+"*"+p+"=");
                    f=j1+j2;
                    
                    
                    break;
                case 14:
                    text.setText(x+"*"+y+"+"+o+"/"+p+"=");
                    f=1+s2;
                    
                    
                    break;
                case 15:
                    text.setText(x+"/"+y+"+"+o+"*"+p+"=");
                    f=s1+j2;
                    
                    
                    break;
                case 16:
                    text.setText(x+"/"+y+"+"+o+"/"+p+"=");
                    f=s2+s1;
                    
                    break;
                default:
                    break;
                }
            }
     };
     
     listener4 = new OnClickListener() {
            public void onClick(View v) {
                 String o;
                 o=readFiles5(); 
                 final int p = Integer.parseInt(o); 
                 if(o.equals("0")) {
                     AlertDialog.Builder builder  = new Builder(hunhe.this);
                     builder.setTitle("信息提醒" ) ;
                     builder.setMessage("您的道具余额不足，请去商城购买道具！" ) ;
                     builder.setPositiveButton("确定" ,  null );
                     builder.show();
                     }
                 else{                                     
                     AlertDialog.Builder builder  = new Builder(hunhe.this);
                     builder.setTitle("信息提醒" ) ;
                     builder.setMessage("正确答案为："+f+"
"+"您用掉了一个道具" ) ;
                     builder.setPositiveButton("确定" ,  null );
                     builder.show(); 
                     daoju=p-1;
                     writeFiles5(""+daoju);
                     }
            }
     };
     setContentView(R.layout.jiafa);
        button1 = (Button) findViewById(R.id.start);
        button1.setOnClickListener(listener1);

        button2 = (Button) findViewById(R.id.tijiao);
        button2.setOnClickListener(listener2);
        
        button3 = (Button) findViewById(R.id.next);
        button3.setOnClickListener(listener3);
        

        button4 = (Button) findViewById(R.id.daoju);
        button4.setOnClickListener(listener4);

    }
    
    // 读取等级
    private String readFiles3() {  
        String content3 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME3);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content3 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content3;  
    }  
 // 保存文件内容  
    private void writeFiles3(String content3) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos3 = openFileOutput(FILENAME3,  
                    Context.MODE_PRIVATE);  
            fos3.write(content3.getBytes());  
            fos3.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
    
    // 读取金币
    private String readFiles4() {  
        String content4 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME4);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content4 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content4;  
    }  
 // 保存文件内容  
    private void writeFiles4(String content4) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos4 = openFileOutput(FILENAME4,  
                    Context.MODE_PRIVATE);  
            fos4.write(content4.getBytes());  
            fos4.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
 // 读取道具数
    private String readFiles5() {  
        String content5 = null ;  
        try {  
            FileInputStream fis = openFileInput(FILENAME5);  
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = fis.read(buffer)) != -1) {  
                baos.write(buffer, 0, len);  
            }  
            content5 = baos.toString();  
            fis.close();  
            baos.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return content5;  
    }  
 // 保存文件内容  
    private void writeFiles5(String content5) {  
        try {  
            // 打开文件获取输出流，文件不存在则自动创建  
            FileOutputStream fos5 = openFileOutput(FILENAME5,  
                    Context.MODE_PRIVATE);  
            fos5.write(content5.getBytes());  
            fos5.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
}

商城类：

package com.example.XXSCYS;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import android.R.integer;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class shangcheng extends Activity{
    OnClickListener listener1 = null;
    Button button1;//定义按钮
    public static final String FILENAME4 = "money.set"; 
    public static final String FILENAME5 = "daoju.set"; 
    private int money;
    private int daoju;
    
    /** Called when the activity is first created. */
    @Override
     public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.shangcheng);    
            
            listener1 = new OnClickListener() {
                public void onClick(View v) {
                     String m;
                        String n;
                        m=readFiles4(); 
                         n=readFiles5(); 
                         final int i = Integer.parseInt(m); 
                         final float j = Float.parseFloat(n); 
                         if(i<=0){
                             AlertDialog.Builder builder  = new Builder(shangcheng.this);
                             builder.setTitle("信息提醒" ) ;
                             builder.setMessage("对不起，您的金币不足！！" ) ;
                             builder.setPositiveButton("确定" ,  null );
                             builder.show();
                         }
                         else{
                            money=i-50;
                            daoju=(int) (j+1);
                             writeFiles4(""+money);
                             writeFiles5(""+daoju);
                             AlertDialog.Builder builder  = new Builder(shangcheng.this);
                             builder.setTitle("信息提醒" ) ;
                             builder.setMessage("恭喜您，道具购买成功！" ) ;
                             builder.setPositiveButton("确定" ,  null );
                             builder.show();
                              }
                }
         };
          
           setContentView(R.layout.shangcheng);
            button1 = (Button) findViewById(R.id.button1);
            button1.setOnClickListener(listener1);
            
}
    // 读取金币
        private String readFiles4() {  
            String content4 = null ;  
            try {  
                FileInputStream fis = openFileInput(FILENAME4);  
                ByteArrayOutputStream baos = new ByteArrayOutputStream();  
                byte[] buffer = new byte[1024];  
                int len = 0;  
                while ((len = fis.read(buffer)) != -1) {  
                    baos.write(buffer, 0, len);  
                }  
                content4 = baos.toString();  
                fis.close();  
                baos.close();  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
            return content4;  
        }  
     // 保存文件内容  
        private void writeFiles4(String content4) {  
            try {  
                // 打开文件获取输出流，文件不存在则自动创建  
                FileOutputStream fos4 = openFileOutput(FILENAME4,  
                        Context.MODE_PRIVATE);  
                fos4.write(content4.getBytes());  
                fos4.close();  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
        }  
        
     // 读取道具数
        private String readFiles5() {  
            String content5 = null ;  
            try {  
                FileInputStream fis = openFileInput(FILENAME5);  
                ByteArrayOutputStream baos = new ByteArrayOutputStream();  
                byte[] buffer = new byte[1024];  
                int len = 0;  
                while ((len = fis.read(buffer)) != -1) {  
                    baos.write(buffer, 0, len);  
                }  
                content5 = baos.toString();  
                fis.close();  
                baos.close();  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
            return content5;  
        }  
     // 保存文件内容  
        private void writeFiles5(String content5) {  
            try {  
                // 打开文件获取输出流，文件不存在则自动创建  
                FileOutputStream fos5 = openFileOutput(FILENAME5,  
                        Context.MODE_PRIVATE);  
                fos5.write(content5.getBytes());  
                fos5.close();  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
        }  
}

用户信息类:

package com.example.XXSCYS;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class xinxi extends Activity{
    TextView textView;
      public static final String FILENAME3 = "dengji.set"; 
      public static final String FILENAME4 = "money.set"; 
      public static final String FILENAME2 = "xinxi.set";
      public static final String FILENAME5 = "daoju.set"; 
      private String money;
      private String dengji;
      private String nicheng;
      private String daoju;
      
     protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.xinxi);
            nicheng=readFiles2();
            money=readFiles4(); 
            dengji=readFiles3(); 
            daoju=readFiles5(); 
            textView = (TextView) findViewById(R.id.textView1);
            textView.setText("昵称:"+nicheng+"
"+"等级:"+dengji+"
"+"金币:"+money+"
"+"道具:"
            +daoju+"

"+"温馨提示："+"
"+"每答对一道题可获取10金币，等级提升0.1级，答错一题则扣5金币");
            
     }
     
    // 读取昵称
        private String readFiles2() {  
            String content4 = null ;  
            try {  
                FileInputStream fis = openFileInput(FILENAME2);  
                ByteArrayOutputStream baos = new ByteArrayOutputStream();  
                byte[] buffer = new byte[1024];  
                int len = 0;  
                while ((len = fis.read(buffer)) != -1) {  
                    baos.write(buffer, 0, len);  
                }  
                content4 = baos.toString();  
                fis.close();  
                baos.close();  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
            return content4;  
        }  
        
        
    // 读取等级  
        private String readFiles3() {  
            String content4 = null ;  
            try {  
                FileInputStream fis = openFileInput(FILENAME3);  
                ByteArrayOutputStream baos = new ByteArrayOutputStream();  
                byte[] buffer = new byte[1024];  
                int len = 0;  
                while ((len = fis.read(buffer)) != -1) {  
                    baos.write(buffer, 0, len);  
                }  
                content4 = baos.toString();  
                fis.close();  
                baos.close();  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
            return content4;  
        }  
        
     // 读取金币  
        private String readFiles4() {  
            String content4 = null ;  
            try {  
                FileInputStream fis = openFileInput(FILENAME4);  
                ByteArrayOutputStream baos = new ByteArrayOutputStream();  
                byte[] buffer = new byte[1024];  
                int len = 0;  
                while ((len = fis.read(buffer)) != -1) {  
                    baos.write(buffer, 0, len);  
                }  
                content4 = baos.toString();  
                fis.close();  
                baos.close();  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
            return content4;  
        } 
        // 读取道具数
        private String readFiles5() {  
            String content5 = null ;  
            try {  
                FileInputStream fis = openFileInput(FILENAME5);  
                ByteArrayOutputStream baos = new ByteArrayOutputStream();  
                byte[] buffer = new byte[1024];  
                int len = 0;  
                while ((len = fis.read(buffer)) != -1) {  
                    baos.write(buffer, 0, len);  
                }  
                content5 = baos.toString();  
                fis.close();  
                baos.close();  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
            return content5;  
        }  
}

附加类：

package com.example.XXSCYS;
import android.app.Activity;
import android.os.Bundle;

public class a extends Activity{
     protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.a);
     }
}

项目发布： 

我们团队把整个项目文件上传到Github，链接地址：https://github.com/scarletcirno/students

app推广：

第一步：在QQ群和微信群里边，呼吁大家下载APP体验，但是效果比较差，下载量比较小，于是采用逐个逐个单独和同学沟通，认真听取他们的体验感受。

第二步：我们采用了人海战术，通过微信公众号来推广，找到一些微信公众号平台，比如：广商微生活。在底部菜单加上我们APP的下载链接，引导他们下载使用。

第三步：最后采用有针对性的推广，锁定用户人群，小学生的家长，于是找到各个同学的亲戚朋友，让他们下载APP体验，总结不足和优点。

总结：这推广过程中，我们也遇到了很多困难，但是，我们收获了很多，明白产品推广的不易之处，相信这份体验会给将来的学习和工作带来一点帮助。