Android 小项目之--数据存储【Files】（附源码）

package  com.terry;
 
import  java.io.FileInputStream;
import  java.io.FileNotFoundException;
import  java.io.FileOutputStream;
import  java.io.IOException;
import  java.util.Properties;

import  android.app.Activity;
import  android.content.Context;
import  android.content.SharedPreferences;
import  android.os.Bundle;
import  android.view.KeyEvent;
import  android.widget.CheckBox;
import  android.widget.CompoundButton;
import  android.widget.TextView;
import  android.widget.CompoundButton.OnCheckedChangeListener;

public   class  sharedPreActivity  extends  Activity {
     private  TextView myTextView;
     private  CheckBox myBox;
     private  playMusic PLAYER = null ;
     private   boolean  isplay = false ;

     /**  Called when the activity is first created.  */
    @Override
     public   void  onCreate(Bundle savedInstanceState) {
         super .onCreate(savedInstanceState);
        setContentView(R.layout.main);
        myTextView = (TextView)findViewById(R.id.TextView01);
        
        myBox = (CheckBox)findViewById(R.id.CheckBox01);
        PLAYER = new  playMusic( this ); 
         /*
         * 文件创建模式：Activity.MODE_APPEND
         * 如果该文件已经存在，然后将数据写入，而不是抹掉它现有文件的末尾。
          */  
         /*
         * 文件创建模式：MODE_PRIVATE
         * 默认模式，在那里创建的文件只能由应用程序调用,即为私有的
          */  
         /*
         * 文件创建模式：Activity.MODE_WORLD_READABLE
         * 允许所有其他应用程序有读取和创建文件的权限。
          */
         /*
         * 文件创建模式：Activity.MODE_WORLD_WRITEABLE
         * 允许所有其他应用程序具有写入、访问和创建的文件权限。
          */
        
         /*
         * SharedPreferences---数据存储之获取
        SharedPreferences settings=getPreferences(Activity.MODE_PRIVATE);
        
        isplay=settings.getBoolean("isplay", false); //通过key值找到value，如果不存在即返回false
        
         */
        load();
        myBox.setChecked(isplay);
         if (isplay){
            
            myTextView.setText( " 当前音乐的播放状态:开 " );
            isplay = true ;
            PLAYER.Play();
        }
         else {
            myTextView.setText( " 当前音乐的播放状态:关 " );
        }
       
        myBox.setOnCheckedChangeListener( new  OnCheckedChangeListener() {
            
            @Override
             public   void  onCheckedChanged(CompoundButton buttonView,  boolean  isChecked) {
                 //  TODO Auto-generated method stub
                 if (isChecked)
                {
                    myTextView.setText( " 当前音乐的播放状态:开 " );
                    isplay = true ;
                    PLAYER.Play();
                }
                 else {
                    myTextView.setText( " 当前音乐的播放状态:关 " );
                    isplay = false ;
                    PLAYER.FreeMusc();
                }
            }
        });
        
    }
    
    @Override
     public   boolean  onKeyDown( int  keyCode, KeyEvent event) {
         //  TODO Auto-generated method stub
         if (keyCode == KeyEvent.KEYCODE_BACK){
             /*
             * SharedPreferences  --数据存储之保存
            SharedPreferences uiState=getPreferences(0);
            SharedPreferences.Editor editor=uiState.edit();
            editor.putBoolean("isplay", isplay);
            editor.commit(); 
             */
            save();
             if (isplay)
            {
                PLAYER.FreeMusc();
            }
             this .finish();
             return   true ;
        }
            
         return   super .onKeyDown(keyCode, event);
    }
    
    
     void  load() 
    {
        Properties properties = new  Properties();
         try  {
            FileInputStream stream  = this .openFileInput( " music.cfg " );
            properties.load(stream);
        }  catch  (FileNotFoundException e) {
             //  TODO: handle exception
             return ;
        }  catch  (IOException e) {
             //  TODO Auto-generated catch block
             return ;
        }
        isplay = Boolean.valueOf(properties.get( " isplay " ).toString());
    }
    
     boolean  save()
    {
        Properties properties  = new  Properties(); 
        properties.put( " isplay " , String.valueOf(isplay));
         try  {
            FileOutputStream stream = this .openFileOutput( " music.cfg " , Context.MODE_WORLD_WRITEABLE);
            properties.store(stream,  "" );
        }  catch  (FileNotFoundException e) {
             //  TODO: handle exception
             return   false ;
        } catch  (IOException e) {
             //  TODO: handle exception
             return   false ;
        }
         return   true ;
        
    }
    
}