安卓版四则运算

package com.example.add;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

import com.example.add.opt;

import java.text.DecimalFormat;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.text.InputType;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

    public class MainActivity extends Activity {
        
        int x;//题目个数
        int y=0;
        int n;
        int i=1;
        char[] op = { '+', '-', '*', '/' };
        int[] nov = new int[4];
        int zf;//控制正负
        int zz;//题型控制
        String str = new String();
        String str1 = new String();
        int[] num1 = new int[5];
        String s[] = new String[5];
        int num2=0;
        float[] anser=new float[5];//用户的答案
        float[] trueanser=new float[5];//正确答案
        File file;
        int a=0;
        int b=0;
        int bb=0;
        // int c = 0;
        opt opt=new opt();;
        EditText editText,xs;
        StringBuffer text,text1;
        String number_1="",number_2="";
        boolean clicked=false;
        byte style=0;
        Button btn_1,btn_2,btn_3,btn_4,btn_5,btn_6,btn_7,btn_8,btn_9,btn_0;
        Button start,btn_eq,btn_dot,btn_clear;
        /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.fragment_main);
            text=new StringBuffer();
            editText=(EditText)findViewById(R.id.result);
            xs=(EditText)findViewById(R.id.xs);
            //editText.setFocusable(false);
            btn_1=(Button) findViewById(R.id.btn_1);
            btn_1.setOnClickListener(new Button.OnClickListener(){

                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if(clicked){
                        editText.setText("");
                        clicked=false;
                        text.setLength(0);
                    }
                    text.append("7");
                    editText.setText(text.toString());
                    
                }
                
            });
            btn_2=(Button) findViewById(R.id.btn_2);
            btn_2.setOnClickListener(new Button.OnClickListener(){
                
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if(clicked){
                        editText.setText("");
                        clicked=false;
                        text.setLength(0);
                    }
                    text.append("8");
                    editText.setText(text.toString());
                }
            });
            btn_3=(Button) findViewById(R.id.btn_3);
            btn_3.setOnClickListener(new Button.OnClickListener(){
                
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if(clicked){
                        editText.setText("");
                        clicked=false;
                        text.setLength(0);
                    }
                    text.append("9");
                    editText.setText(text.toString());
                }
                
            });
            btn_4=(Button) findViewById(R.id.btn_4);
            btn_4.setOnClickListener(new Button.OnClickListener(){
                
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if(clicked){
                        editText.setText("");
                        clicked=false;
                        text.setLength(0);
                    }
                    text.append("4");
                    editText.setText(text.toString());
                }
                
            });
            btn_5=(Button) findViewById(R.id.btn_5);
            btn_5.setOnClickListener(new Button.OnClickListener(){
                
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if(clicked){
                        editText.setText("");
                        clicked=false;
                        text.setLength(0);
                    }
                    text.append("5");
                    editText.setText(text.toString());
                }
                
            });
            btn_6=(Button) findViewById(R.id.btn_6);
            btn_6.setOnClickListener(new Button.OnClickListener(){
                
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if(clicked){
                        editText.setText("");
                        clicked=false;
                        text.setLength(0);
                    }
                    text.append("6");
                    editText.setText(text.toString());
                }
                
            });
            btn_7=(Button) findViewById(R.id.btn_7);
            btn_7.setOnClickListener(new Button.OnClickListener(){
                
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if(clicked){
                        editText.setText("");
                        clicked=false;
                        text.setLength(0);
                    }
                    text.append("1");
                    editText.setText(text.toString());
                }
                
            });
            btn_8=(Button) findViewById(R.id.btn_8);
            btn_8.setOnClickListener(new Button.OnClickListener(){
                
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if(clicked){
                        editText.setText("");
                        clicked=false;
                        text.setLength(0);
                    }
                    text.append("2");
                    editText.setText(text.toString());
                }
                
            });
            btn_9=(Button) findViewById(R.id.btn_9);
            btn_9.setOnClickListener(new Button.OnClickListener(){
                
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if(clicked){
                        editText.setText("");
                        clicked=false;
                        text.setLength(0);
                    }
                    text.append("3");
                    editText.setText(text.toString());
                }
                
            });
            btn_0=(Button) findViewById(R.id.btn_0);
            btn_0.setOnClickListener(new Button.OnClickListener(){
                
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if(clicked){
                        editText.setText("");
                        clicked=false;
                        text.setLength(0);
                    }
                    text.append("0");
                    editText.setText(text.toString());
                }
                
            });
            btn_dot=(Button) findViewById(R.id.btn_dot);
            btn_dot.setOnClickListener(new Button.OnClickListener(){
                
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if(clicked){
                        editText.setText("");
                        clicked=false;
                        text.setLength(0);
                    }
                    if(editText.getText().toString().indexOf(".")==-1){//已经有.了
                        if(text.length()==0){
                            text.append("0.");
                        }else{
                            text.append(".");
                        }
                        editText.setText(text.toString());
                    }
                }
                
            });
            btn_eq=(Button) findViewById(R.id.btn_eq);
            btn_eq.setOnClickListener(new Button.OnClickListener(){
                
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if(b==1)
                    {
                        if(editText.getText().toString().length()!=0)
                        {
                            try
                            {
                                x=Integer.parseInt(editText.getText().toString());
                                if(x>=0 && x<=5)b++;
                                else Toast.makeText(MainActivity.this, "输入有误", 1).show();
                            }
                            catch(NumberFormatException x)
                            {
                                Toast.makeText(MainActivity.this, "输入有误", 1).show();
                            }
                        }
                        else Toast.makeText(MainActivity.this, "输入有误", 1).show();
                        editText.setText("");
                        number_1="";
                        number_2="";
                        style=0;
                        clicked=false;
                        text.setLength(0);
                    }
                    if(b==2)
                    {
                        if(n!=0)anser[i-2]=Float.parseFloat(editText.getText().toString());
                        str1="第"+i+"条题目为:";
                        n=(int)(Math.random() * 4 + 2);//随机出运算符的数量
                        zz=(int)(Math.random()*2);
                        for(int j=0;j<n;j++)
                        {
                            //zf=(int)(Math.random()*2);
                            //if(zf==0)//负
                            //    num1[j]=-(int)(Math.random()*100);//产生随机数
                            //else        //正
                                num1[j]=(int)(Math.random()*100);
                                if(zz==1)num1[j]=(int)(Math.random()*10+1);
                        }
                        for(int k=0;k<n-1;k++)
                        {
                            nov[k]=(int)(Math.random()*4);
                            if(nov[k]==3&&num1[k+1]==0)
                            {
                                do
                                {
                                    num1[k+1]=(int)(Math.random()*100);
                                }while(num1[k+1]==0);
                            }
                        }
                        str="";
                        if(zz==0)
                        {
                            for(int j=0;j<n;j++)
                            {
                                //if(num1[j]<0)str=str+"("+String.valueOf(num1[j])+")";
                                str=str+String.valueOf(num1[j]);
                                if(j==n-1)
                                {
                                    //try
                                    //{
                                        //int ii=0;
                                        try{
                                            trueanser[i-1]=opt.Math(str);
                                            DecimalFormat df = new DecimalFormat("#.00");
                                            trueanser[i-1]=Float.parseFloat(df.format(trueanser[i-1]));
                                        } catch (Exception e1) {
                                            // TODO 自动生成的 catch 块
                                            e1.printStackTrace();
                                        }
                                    //}
                                    /*catch (Exception e1)
                                    {
                                        System.out.println(e1);
                                        //e1.printStackTrace();
                                    }*/
                                    str=str+"=";
                                    //str=str+String.valueOf(trueanser[i-1]);
                                    xs.setText(str1+str);
                                    break;
                                }
                                str=str+op[nov[j]];
                            }
                        }
                        if(zz==1)
                        {
                            trueanser[i-1]=1;
                            str=String.valueOf(num1[0])+"!=";
                            for(int j=1;j<=num1[0];j++)
                            trueanser[i-1]=trueanser[i-1]*j;
                            //str=str+String.valueOf(trueanser[i-1]);
                            xs.setText(str1+str);
                        }
                        if(i==x+1)
                        {
                            b=3;
                            anser[i-2]=Float.parseFloat(editText.getText().toString());
                        }
                        else i++;
                        editText.setText("");
                        number_1="";
                        number_2="";
                        style=0;
                        clicked=false;
                        text.setLength(0);
                    }
                    if(b==3)
                    {
                        y=0;
                        for(int j=0;j<x;j++)
                        {
                            if(anser[j]==trueanser[j])y++;
                        }
                        xs.setText("答题完成!答对"+y+"道!");
                        b=0;
                        editText.setText("");
                        number_1="";
                        number_2="";
                        style=0;
                        clicked=false;
                        text.setLength(0);
                    }
                }
            });
            start=(Button) findViewById(R.id.start);
            start.setOnClickListener(new Button.OnClickListener(){
                
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    xs.setText("请输入出题数量!(1-5)");
                    n=0;
                    i=1;
                    b=1;
                }
            });
            btn_clear=(Button) findViewById(R.id.btn_clear);
            btn_clear.setOnClickListener(new Button.OnClickListener(){
                
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    editText.setText("");
                    number_1="";
                    number_2="";
                    style=0;
                    clicked=false;
                    text.setLength(0);
                }
            });
        }
    }

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/result"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:cursorVisible="false"
        android:digits="1234567890."
        android:ems="10"
        android:focusable="false"
        android:numeric="decimal"
        android:singleLine="true" />

    <TableLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:stretchColumns="0,1,2,3" >

        <TableRow>

            <Button
                android:id="@+id/btn_1"
                android:text="7" />

            <Button
                android:id="@+id/btn_2"
                android:text="8" />

            <Button
                android:id="@+id/btn_3"
                android:text="9" />
        </TableRow>

        <TableRow>

            <Button
                android:id="@+id/btn_4"
                android:text="4" />

            <Button
                android:id="@+id/btn_5"
                android:text="5" />

            <Button
                android:id="@+id/btn_6"
                android:text="6" />
        </TableRow>

        <TableRow>

            <Button
                android:id="@+id/btn_7"
                android:text="1" />

            <Button
                android:id="@+id/btn_8"
                android:text="2" />

            <Button
                android:id="@+id/btn_9"
                android:text="3" />
        </TableRow>

        <TableRow>

            <Button
                android:id="@+id/btn_dot"
                android:text="." />

            <Button
                android:id="@+id/btn_0"
                android:text="0" />

            <Button
                android:id="@+id/btn_eq"
                android:text="确定" />
        </TableRow>
    </TableLayout>

    <Button
        android:id="@+id/btn_clear"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="清除" />

    <EditText
        android:id="@+id/xs"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:focusable="false"
        android:text="欢迎使用四则运算程序!" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="开始" />

</LinearLayout>

package com.example.add;
import java.util.Stack;
public class opt
{
    public float Math(String str) throws Exception
    { 
        String[] operater =new String[20]; 
        String[] number = new String[20]; 
        Stack countStack1 = new Stack(); 
        Stack countStack2 = new Stack(); 
        float result =0;
        float x=0;
        number = str.split("\/|\*|\+|\-"); 
        operater= str.split("\d+");
        if(number.length<2)throw new Exception("请输入两位计算数以上!");
        for(int i = 0; i<number.length;i++)
        {
            try
            {
                x=Float.parseFloat(number[i]);
            }
            catch(NumberFormatException e)
            {
                throw new Exception("输入错误!请重新输入!");
            }
            if(operater[i].equals("/"))if(x==0)throw new Exception("除数不能为0!");
            countStack1.push(number[i]);
            if(i!=number.length-1)
            {
                if(operater[i+1]!=null)countStack1.push(operater[i+1]);
            }
        }
        while(!countStack1.isEmpty())countStack2.push(countStack1.pop());
        String op;
        while(!countStack2.isEmpty())
        { 
            result=0;
            op=countStack2.pop().toString();
            if(op.equals("*"))
            {
                result=Float.parseFloat(countStack1.pop().toString())*Float.parseFloat(countStack2.pop().toString());
                if(number.length==2)return result;
                countStack1.push(result);
                continue;
            }
            if(op.equals("/"))
            {
                result=Float.parseFloat(countStack1.pop().toString())/Float.parseFloat(countStack2.pop().toString());
                if(number.length==2)return result;
                countStack1.push(result);
                continue;
            }
            countStack1.push(op);
        }
        while(!countStack1.isEmpty())countStack2.push(countStack1.pop());
        while(!countStack2.isEmpty())
        {
            result=0;
            op = countStack2.pop().toString();
            if(op.equals("+"))
            {
                result=Float.parseFloat(countStack1.pop().toString())+Float.parseFloat(countStack2.pop().toString());
                countStack1.push(result);
                continue;
            }
            if(op.equals("-"))
            {
                result=Float.parseFloat(countStack1.pop().toString())-Float.parseFloat(countStack2.pop().toString());
                countStack1.push(result);
                continue;
            }
            countStack1.push(op);
        }
        return result;
    }
}

这一次将我们之前的程序转换成了安卓应用版,主要功能尚未有多大变化,接下来几天将会继续改进!

程序截图:

PS:程序界面比较简陋!我们会试着改进的!