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;
        
    }

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;
        
    }
    
}