Android学习之使用SharedPreferences存储应用程序数据

/*  * @author:conowen  * @date:12.3.01  *  */ package com.conowen.sharedpreferences;  import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button;  public class SharedPreferencesActivity extends Activity {   /** Called when the activity is first created. */   @Override   public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main);     Button play = (Button) findViewById(R.id.play);      Button pause = (Button) findViewById(R.id.pause);        final Intent intent = new Intent(SharedPreferencesActivity.this,service.class);      // 定义intent为final，全局变量，供下面两个匿名内部类（onclicklisenter）使用      play.setOnClickListener(new OnClickListener() {          @Override        public void onClick(View v) {          // TODO Auto-generated method stub          startService(intent);          // 开始播放，通过前面定义好的intent传递          }      });      pause.setOnClickListener(new OnClickListener() {          @Override        public void onClick(View v) {          // TODO Auto-generated method stub          stopService(intent);          // 停止播放          }      });         } } 

 /*  * @author:conowen  * @date:12.3.01  *  */ package com.conowen.sharedpreferences;  import android.app.Service; import android.content.Intent; import android.content.SharedPreferences; import android.media.MediaPlayer; import android.os.IBinder;  public class service extends Service {    MediaPlayer player;    // 新建播放器    @Override   public void onCreate() {     // TODO Auto-generated method stub     super.onCreate();     player = MediaPlayer.create(this, R.raw.lt26);     player.setLooping(true);     // 两种方式的第一个生命周期都是onCreate（）   }    @Override   public void onStart(Intent intent, int startId) {     // TODO Auto-generated method stub     super.onStart(intent, startId);     SharedPreferences sp = this.getSharedPreferences("music_progress",         MODE_PRIVATE);     // music_progress为XML文件的文件名     player.seekTo(sp.getInt("progress", 0));     // progress为键值对中的key，progress所对应的值通过player.getCurrentPosition()获得，请看下面详细     // 每次调用onStart方法时，就会设置player的进度     // MediaPlayer的seekTo方法，读取进度，然后播放，getInt的第一个参数是所要读取的key名字，第二个参数为默认初始值。也就是说进度初始默认为0     player.start();   }    @Override   public void onDestroy() {     // TODO Auto-generated method stub     super.onDestroy();     SharedPreferences sp = this.getSharedPreferences("music_progress",         MODE_PRIVATE);     sp.edit().putInt("progress", player.getCurrentPosition()).commit();     // player.getCurrentPosition()方法获取播放进度的数据     // commit()方法是保存SharedPreferences获取来的数据     player.stop();   }    @Override   public IBinder onBind(Intent intent) {     // TODO Auto-generated method stub     return null;   }  } 

<?xml version='1.0' encoding='utf-8' standalone='yes' ?> <map> <int name="progress" value="90695" /> </map>