Android应用之个人应用软件开发(3)【SQLite数据库及理财功能实现】

  Android给我们提供 Sqlite这种轻量级数据库，并提供了一些数据操作访问的类库.如：SQLiteOpenHelper 主要是处理打开、创建、更新等方法的类库。

  有onCreate() onOpen() onUpgarde(db,int ,int) 等方法，还有几个重要的和常用的类也要说一下，就是SqliteDataBase,提供操作SQLite的增、查、删、改等基本方法。还有就是ContentValues ,用来维持当前已打开的数据库的相关数据，当然也提供了增、查、删、改，只不过是在当前数据中。那么先实现创建，和提供的一些自定义的接口，方便我们以后使用，引用方便。

 一些数据字段的都放在这个接口中：

publicinterface PublicDataCost {
    //定义数据库名称
    String DATABASE_NAME ="ZisouBaseDate";
    int DATABASE_VERSION =1;
    
    //路径地址
    String DB_PATH = 
        "/data/data/Zisou.Soft.mini/databases";
    String PATH ="/databases";
    String DB_NAME ="zisoubasedate.db";
    
    //定义共享优先数据及基础字段
    String MY_RMBCost ="MY_RMBCost";
    String TodayTime ="TodayTime";

    //Sqlite数据库基础字段
    //公有字段
    String ID ="id";
    //TodaySpend表结构
    String Tb_Name_1 ="TodaySpend";                       
    String Field_1_1 ="Morning";     
    String Field_1_2 ="Noon";         
    String Field_1_3 ="Night";      
    String Field_1_4 ="OtherSpend"; 
    String Field_1_5 ="DailySpend"; 
    String Field_1_6 ="DateTimes"; 
}

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.view.View.OnClickListener;
publicclass SqliteCommen extends SQLiteOpenHelper {

    //定义增，改，删，清除字段
    OnClickListener dbl_add =null;
    OnClickListener dbl_update =null;
    OnClickListener dbl_delete =null;

    public SqliteCommen(Context context) {
        super(context, PublicDataCost.DATABASE_NAME, null, PublicDataCost.DATABASE_VERSION);
        // TODO Auto-generated constructor stub
    }
    
    @Override
    publicvoid onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        String sql ="CREATE TABLE "+ PublicDataCost.Tb_Name_1 +" (" 
        + PublicDataCost.ID  +" INTEGER primary key autoincrement, " 
        + PublicDataCost.Field_1_1 +" text not null, " 
        + PublicDataCost.Field_1_2 +" text not null, " 
        + PublicDataCost.Field_1_3 +" text not null, "
        + PublicDataCost.Field_1_4 +" text not null, "
        + PublicDataCost.Field_1_5 +" text not null, "
        + PublicDataCost.Field_1_6 +" text not null "
        +");";
        db.execSQL(sql);
    }
    @Override
    publicvoid onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        
    }
}

写好简单的基本的数据库的基本方法，在的程序中也要使用到一些必不可少的方法，那可以通用写在Commen类里面。

    SqliteCommen sqlc;

    privateboolean addflag =false; 

    privateint spinnerid;
    sqlc =  new SqliteCommen(this);
    SQLiteDatabase db = sqlc.getReadableDatabase();

将dbl_add的监听事件注册，在这里需要考虑什么时候需要添加，什么时候需要修改，那就需要两个条件，一个就是标识，和修改的ID值，当通过Sprinner下拉表传递过来的值将其绑定绑定在EeitView控件上，然后标识Button.setText()值为“修改”。addflag = true 来判断修改和删除。

        sqlc.dbl_add =new OnClickListener() {

            publicvoid onClick(View v) {
              if(addflag ==false)
              {
                 //添加
                 Cursor c = db.query(PublicDataCost.Tb_Name_1, AllFeild, "DateTimes='"+ str +"'", null, null, null, null);
                 if(c.getCount()>0)
                 {
                    Toast.makeText( todayspend.this , "今天已经添加账单，你可以修改今日账单！", Toast.LENGTH_SHORT).show();
                 }
                 else
                 {
                     ContentValues cv =new ContentValues();
                     cv.put( PublicDataCost.Field_1_1 , tv_Morning.getText().toString());
                     cv.put( PublicDataCost.Field_1_2 , tv_noon.getText().toString());
                     cv.put( PublicDataCost.Field_1_3 , tv_Night.getText().toString());
                     cv.put( PublicDataCost.Field_1_4 , tv_OtherSpend.getText().toString());
                     cv.put( PublicDataCost.Field_1_5 , tv_DailySpend.getText().toString());
                     cv.put( PublicDataCost.Field_1_6 , str);
                     SQLiteDatabase db = sqlc.getReadableDatabase();
                     db.insert(PublicDataCost.Tb_Name_1, null, cv);
                     db.close();
                     Toast.makeText( todayspend.this , "添加成功！", Toast.LENGTH_SHORT).show(); 
                     onCreate(savedInstanceState);
                 }
                 c.close();
              }
              else
              {
                  //修改
                  ContentValues cv =new ContentValues();
                  cv.put( PublicDataCost.Field_1_1 , tv_Morning.getText().toString());
                  cv.put( PublicDataCost.Field_1_2 , tv_noon.getText().toString());
                  cv.put( PublicDataCost.Field_1_3 , tv_Night.getText().toString());
                  cv.put( PublicDataCost.Field_1_4 , tv_OtherSpend.getText().toString());
                  cv.put( PublicDataCost.Field_1_5 , tv_DailySpend.getText().toString());
                  String sqlwhere =  PublicDataCost.ID +" = "+ spinnerid;
                  SQLiteDatabase db = sqlc.getReadableDatabase();
                  db.update(PublicDataCost.Tb_Name_1, cv, sqlwhere ,null);
                  db.close();
                  onCreate(savedInstanceState);
                  Toast.makeText( todayspend.this , "修改成功！", Toast.LENGTH_SHORT).show(); 
                  
              }
            }
        };

然后就是Spinner的绑定和注册了，先将数据库里面的日期取出来，在SetAdapter中绑定，R.layout.simple_dropdown_item_1line，当然也可以自己定义里面的东西，比如图文结合的下拉列表，在绑定的同时也把Spinner中的setSelection默认选择值给赋值一下。显示从库中出来的最后一条数据。最后再注册事件中将spinnerid = Integer.parseInt(c.getString(0));赋值，以便修改时候用到。

//将事件绑定到按钮
        bt_addspend.setOnClickListener(sqlc.dbl_add);
        //绑定列表
        Cursor c = db.query( PublicDataCost.Tb_Name_1 , new String[] {PublicDataCost.Field_1_6}, null, null, null , null, null);
        c.moveToFirst();
        CharSequence[] cslist =new CharSequence[c.getCount()];
        for(int i=0;i<cslist.length;i++)
        {
            cslist[i]=c.getString(0);
            c.moveToNext();
        }
        c.close();
        Spinner sp = (Spinner)findViewById(R.id.spinner1);
        sp.setAdapter(new ArrayAdapter<CharSequence>(this,android.R.layout.simple_dropdown_item_1line,cslist));
        sp.setSelection(cslist.length-1);
        //注册事件
        sp.setOnItemSelectedListener(new OnItemSelectedListener() {
            publicvoid onItemSelected(AdapterView<?> parent ,View view, int position, long id){
                String todaydatetime = ((Spinner)parent).getSelectedItem().toString();
                Cursor c = db.query(PublicDataCost.Tb_Name_1, AllFeild, "DateTimes='"+ todaydatetime +"'", null, PublicDataCost.Field_1_6, null, PublicDataCost.Field_1_6);
                c.moveToFirst();
                spinnerid = Integer.parseInt(c.getString(0));
                tv_Morning.setText(c.getString(1));
                tv_noon.setText(c.getString(2));
                tv_Night.setText(c.getString(3));
                tv_OtherSpend.setText(c.getString(4));
                tv_DailySpend.setText(c.getString(5));
                c.close();
            }

            publicvoid onNothingSelected(AdapterView<?> arg0) {
                // TODO Auto-generated method stub
                
            }
        });

然后最后就是将今日和昨日的理财信息给显示出来，我就贴一下全部的代码吧：

import android.app.Activity;
import android.content.ContentValues;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.text.format.Time;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemSelectedListener;

publicclass todayspend extends Activity {
    
    
    SqliteCommen sqlc;//SQLiteOpenHelper
privateboolean addflag =false; //标识
privateint spinnerid;
    
    publicvoid onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.todayspend);
        sqlc =new SqliteCommen(this);
        final TextView vt_qdt = (TextView)findViewById(R.id.tv_qdt);
        final SQLiteDatabase db = sqlc.getReadableDatabase();
        final EditText tv_Morning = (EditText)findViewById(R.id.tv_Morning);
        final EditText tv_noon = (EditText)findViewById(R.id.tv_noon);
        final EditText tv_Night = (EditText)findViewById(R.id.tv_Night);
        final EditText tv_OtherSpend = (EditText)findViewById(R.id.tv_OtherSpend);
        final EditText tv_DailySpend = (EditText)findViewById(R.id.tv_DailySpend);
        final Button bt_addspend = (Button)findViewById(R.id.bt_addspend); 
        final Button bt_qiandao2 = (Button)findViewById(R.id.bt_qd2); 
        final SharedPreferences my_rmb_data = getSharedPreferences(PublicDataCost.MY_RMBCost, 0);
        final String nowtime = my_rmb_data.getString(PublicDataCost.TodayTime, "").toString();
        TextView jrzkx_0 = (TextView)findViewById(R.id.jrzkx_0);
        TextView jrzkx_01 = (TextView)findViewById(R.id.jrzkx_01);
        TextView jrzkx_02 = (TextView)findViewById(R.id.jrzkx_02);
        TextView jrzkx_03 = (TextView)findViewById(R.id.jrzkx_03);
        TextView Zrzkx_0 = (TextView)findViewById(R.id.zrzkx_0);
        TextView Zrzkx_01 = (TextView)findViewById(R.id.zrzkx_01);
        TextView Zrzkx_02 = (TextView)findViewById(R.id.zrzkx_02);
        TextView Zrzkx_03 = (TextView)findViewById(R.id.zrzkx_03);
        
        Time t =new Time();
        t.setToNow();
        int yesterday = t.monthDay -1 ;
        int lastmonth = t.month +1 ;
        String laststrday ="";
        laststrday= t.year +"年"+  lastmonth +"月"+ yesterday +"日";
        final String str =  t.year +"年"+ lastmonth +"月"+ t.monthDay +"日";  
           
           if(nowtime.equals(str)==true)
        {
               vt_qdt.setText("日期："+ nowtime +"已签到！"); 
               bt_qiandao2.setBackgroundResource(R.drawable.yqd);
        }
        else
        {
            vt_qdt.setText("日期："+ str); 
            bt_qiandao2.setBackgroundResource(R.drawable.qd);
        }
        
        //签到功能
        bt_qiandao2.setOnClickListener(new OnClickListener() {
            publicvoid onClick(View v) {
                // TODO Auto-generated method stub
                SharedPreferences my_rmb_data = getSharedPreferences(PublicDataCost.MY_RMBCost, 0); 
                if(my_rmb_data.getString(PublicDataCost.TodayTime, "").toString().equals(str)==true)
                 {
                    Toast.makeText( todayspend.this , "今日已签到！", Toast.LENGTH_SHORT).show();
                 }
                 else
                 {
                       my_rmb_data.edit()
                       .putString(PublicDataCost.TodayTime, str)
                       .commit();
                       vt_qdt.setText("日期："+ str +"已签到！"); 
                       bt_qiandao2.setBackgroundResource(R.drawable.yqd);
                       Toast.makeText( todayspend.this , "签到成功！", Toast.LENGTH_SHORT).show();
                       onCreate(savedInstanceState);
                 }
            }
        });
        
        final String[] AllFeild = 
        {   
            PublicDataCost.ID,
            PublicDataCost.Field_1_1,
            PublicDataCost.Field_1_2,
            PublicDataCost.Field_1_3,
            PublicDataCost.Field_1_4, 
            PublicDataCost.Field_1_5,
            PublicDataCost.Field_1_6
        };
        
        //实例化增 事件
        sqlc.dbl_add =new OnClickListener() {
            publicvoid onClick(View v) {
              if(addflag ==false)
              {
                 //添加
                 Cursor c = db.query(PublicDataCost.Tb_Name_1, AllFeild, "DateTimes='"+ str +"'", null, null, null, null);
                 if(c.getCount()>0)
                 {
                    Toast.makeText( todayspend.this , "今天已经添加账单，你可以修改今日账单！", Toast.LENGTH_SHORT).show();
                 }
                 else
                 {
                     ContentValues cv =new ContentValues();
                     cv.put( PublicDataCost.Field_1_1 , tv_Morning.getText().toString());
                     cv.put( PublicDataCost.Field_1_2 , tv_noon.getText().toString());
                     cv.put( PublicDataCost.Field_1_3 , tv_Night.getText().toString());
                     cv.put( PublicDataCost.Field_1_4 , tv_OtherSpend.getText().toString());
                     cv.put( PublicDataCost.Field_1_5 , tv_DailySpend.getText().toString());
                     cv.put( PublicDataCost.Field_1_6 , str);
                     SQLiteDatabase db = sqlc.getReadableDatabase();
                     db.insert(PublicDataCost.Tb_Name_1, null, cv);
                     db.close();
                     Toast.makeText( todayspend.this , "添加成功！", Toast.LENGTH_SHORT).show(); 
                     onCreate(savedInstanceState);
                 }
                 c.close();
              }
              else
              {
                  //修改
                  ContentValues cv =new ContentValues();
                  cv.put( PublicDataCost.Field_1_1 , tv_Morning.getText().toString());
                  cv.put( PublicDataCost.Field_1_2 , tv_noon.getText().toString());
                  cv.put( PublicDataCost.Field_1_3 , tv_Night.getText().toString());
                  cv.put( PublicDataCost.Field_1_4 , tv_OtherSpend.getText().toString());
                  cv.put( PublicDataCost.Field_1_5 , tv_DailySpend.getText().toString());
                  String sqlwhere =  PublicDataCost.ID +" = "+ spinnerid;
                  SQLiteDatabase db = sqlc.getReadableDatabase();
                  db.update(PublicDataCost.Tb_Name_1, cv, sqlwhere ,null);
                  db.close();
                  onCreate(savedInstanceState);
                  Toast.makeText( todayspend.this , "修改成功！", Toast.LENGTH_SHORT).show(); 
                  
              }
            }
        };
        //将事件绑定到按钮
        bt_addspend.setOnClickListener(sqlc.dbl_add);
        //绑定列表
        Cursor c = db.query( PublicDataCost.Tb_Name_1 , new String[] {PublicDataCost.Field_1_6}, null, null, null , null, null);
        c.moveToFirst();
        CharSequence[] cslist =new CharSequence[c.getCount()];
        for(int i=0;i<cslist.length;i++)
        {
            cslist[i]=c.getString(0);
            c.moveToNext();
        }
        c.close();
        Spinner sp = (Spinner)findViewById(R.id.spinner1);
        sp.setAdapter(new ArrayAdapter<CharSequence>(this,android.R.layout.simple_dropdown_item_1line,cslist));
        sp.setSelection(cslist.length-1);
        //注册事件
        sp.setOnItemSelectedListener(new OnItemSelectedListener() {
            publicvoid onItemSelected(AdapterView<?> parent ,View view, int position, long id){
                String todaydatetime = ((Spinner)parent).getSelectedItem().toString();
                Cursor c = db.query(PublicDataCost.Tb_Name_1, AllFeild, "DateTimes='"+ todaydatetime +"'", null, PublicDataCost.Field_1_6, null, PublicDataCost.Field_1_6);
                c.moveToFirst();
                spinnerid = Integer.parseInt(c.getString(0));
                tv_Morning.setText(c.getString(1));
                tv_noon.setText(c.getString(2));
                tv_Night.setText(c.getString(3));
                tv_OtherSpend.setText(c.getString(4));
                tv_DailySpend.setText(c.getString(5));
                c.close();
            }

            publicvoid onNothingSelected(AdapterView<?> arg0) {
                // TODO Auto-generated method stub
                
            }
        });
        
        //理财信息显示及处理
        Cursor c2 = db.query( PublicDataCost.Tb_Name_1, AllFeild , "DateTimes='"+ str +"'" , null, null, null, null);
        c2.moveToFirst();
        if(c2.getCount()>0)
        {
            int lastspend = Integer.parseInt(c2.getString(1))+Integer.parseInt(c2.getString(2))+Integer.parseInt(c2.getString(3))+Integer.parseInt(c2.getString(4))+Integer.parseInt(c2.getString(5));
            jrzkx_01.setText("早:"+ c2.getString(1) +" 中:"+ c2.getString(2)+" 晚:"+c2.getString(3));
            jrzkx_02.setText("购置:"+ c2.getString(4)+"  日常:"+c2.getString(5));
            jrzkx_03.setText("今日总消费金额："+ lastspend);
            bt_addspend.setText("修   改");
            addflag =true;
        }
        else{
            jrzkx_0.setText("今日未记账");
            jrzkx_01.setText("");
            jrzkx_02.setText("");
            jrzkx_03.setText("");
        }
        c2.close();

        if(yesterday>0)
        {
            Cursor c3 = db.query( PublicDataCost.Tb_Name_1, AllFeild , "DateTimes='"+ laststrday +"'" , null, null, null, null);
            c3.moveToFirst();
            if(c3.getCount()>0)
            {
                int lastspend = Integer.parseInt(c3.getString(1))+Integer.parseInt(c3.getString(2))+Integer.parseInt(c3.getString(3))+Integer.parseInt(c3.getString(4))+Integer.parseInt(c3.getString(5));
                Zrzkx_01.setText("早:"+ c3.getString(1) +" 中:"+ c3.getString(2)+" 晚:"+c3.getString(3));
                Zrzkx_02.setText("购置:"+ c3.getString(4)+"  日常:"+c3.getString(5));
                Zrzkx_03.setText("昨日总消费金额："+ lastspend);
            }
            else{
                Zrzkx_0.setText("昨日未记账");
                Zrzkx_01.setText("");
                Zrzkx_02.setText("");
                Zrzkx_03.setText("");
            }
            c3.close();
        }
        else
        {
            Zrzkx_0.setText("昨日未记账");
            Zrzkx_01.setText("");
            Zrzkx_02.setText("");
            Zrzkx_03.setText("");
        }
        
    }

    
}

代码写好了最后跑起来看一下效果：

 哈哈，然后就可以一目了然的看到很清晰的理财数据，操作也方便，也达到了我们预期想要的功能（记录前一天的理财信息，一键添加，修改，进行理财查询和对比）。

 接下来就是做一个弹入弹出式菜单列表，来对这些功能进行详细的统一管理存放的栏目菜单。

 希望和大家多多相互学习更多的安卓开发方面的相关知识。