Activity与Service之间交互并播放歌曲，为了方便，我把要播放的歌曲定死了，大家可以灵活改进

 

MService：

1 package com.tiantian.test;  2  3 import android.app.Service;  4 import android.content.Intent;  5 import android.media.MediaPlayer;  6 import android.os.Binder;  7 import android.os.Environment;  8 import android.os.IBinder;  9 import android.util.Log; 10 11 public class MService extends Service{
    12     MyBinder myBinder = new MyBinder(); 13     private MediaPlayer mediaPlayer; 14     15     public class MyBinder extends Binder{
    16         MService getService(){
    17             return MService.this; 18         } 19     } 20     @Override 21     public IBinder onBind(Intent intent) {
    22         // TODO Auto-generated method stub 23         Log.v("CAT", "onBind"); 24         return myBinder; 25     } 26 27     @Override 28     public void onCreate() {
    29         // TODO Auto-generated method stub 30         super.onCreate(); 31         Log.v("CAT", "onCreate"); 32         try {
    33             mediaPlayer = new MediaPlayer(); 34             mediaPlayer.setDataSource(Environment.getExternalStorageDirectory() + "/mp3/trhxn.mp3"); 35             mediaPlayer.prepare(); 36         } catch (Exception e) {
    37             // TODO Auto-generated catch block 38             Log.v("CAT", "fail"); 39             e.printStackTrace(); 40         } 41     } 42 43     @Override 44     public void onDestroy() {
    45         // TODO Auto-generated method stub 46         super.onDestroy(); 47         Log.v("CAT", "onDestroy"); 48     } 49 50     @Override 51     public int onStartCommand(Intent intent, int flags, int startId) {
    52         // TODO Auto-generated method stub 53         Log.v("CAT", "onStartCommand"); 54         return super.onStartCommand(intent, flags, startId); 55     } 56 57     @Override 58     public boolean onUnbind(Intent intent) {
    59         // TODO Auto-generated method stub 60         Log.v("CAT", "onUnbind"); 61         return false; 62     } 63     64     public void start(){
    65         mediaPlayer.start(); 66     } 67     public void pause(){
    68         mediaPlayer.pause(); 69     } 70     public void stop(){
    71         mediaPlayer.stop(); 72         mediaPlayer.release(); 73     } 74     public int getDuration(){
    75         return mediaPlayer.getDuration(); 76     } 77     public int getCurrentPosition(){
    78         return mediaPlayer.getCurrentPosition(); 79     } 80     public void seekTo(int position){
    81         mediaPlayer.seekTo(position); 82     } 83 }

MusicPlayActivity：

1 package com.tiantian.test;   2   3 import android.app.Activity;   4 import android.content.ComponentName;   5 import android.content.Intent;   6 import android.content.ServiceConnection;   7 import android.os.Bundle;   8 import android.os.Handler;   9 import android.os.IBinder;  10 import android.util.Log;  11 import android.view.View;  12 import android.view.View.OnClickListener;  13 import android.widget.Button;  14 import android.widget.SeekBar;  15  16 public class MusicPlayActivity extends Activity {
     17     /** Called when the activity is first created. */  18     MService mService;  19     private ServiceConnection conn = new ServiceConnection(){
     20  21         @Override  22         public void onServiceConnected(ComponentName arg0, IBinder arg1) {
     23             // TODO Auto-generated method stub  24             mService = ((MService.MyBinder)arg1).getService();  25             Log.v("CAT", "getServiced");  26         }  27  28         @Override  29         public void onServiceDisconnected(ComponentName name) {
     30             // TODO Auto-generated method stub  31             mService = null;  32         }  33          34     };  35      36     private SeekBar seekBar;  37     private Button playBT;  38      39     private boolean isPlaying = false;  40     private boolean isBinded = false;  41      42     private Handler mHandler;  43     @Override  44     public void onCreate(Bundle savedInstanceState) {
     45         super.onCreate(savedInstanceState);  46         setContentView(R.layout.main);  47         Intent intent = new Intent(MusicPlayActivity.this, MService.class);  48         if(!isBinded){
     49             bindService(intent, conn, BIND_AUTO_CREATE);  50             isBinded = true;  51         }  52         seekBar = (SeekBar) findViewById(R.id.seekBar);  53         playBT = (Button) findViewById(R.id.startBT);  54         mHandler = new Handler();  55         seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
     56              57             @Override  58             public void onStopTrackingTouch(SeekBar seekBar) {}  59              60             @Override  61             public void onStartTrackingTouch(SeekBar seekBar) {}  62              63             @Override  64             public void onProgressChanged(SeekBar seekBar, int progress,  65                     boolean fromUser) {
     66                 if(fromUser){
     67                     mService.seekTo((progress*mService.getDuration())/100);  68                 }  69             }  70         });  71         playBT.setOnClickListener(new OnClickListener() {
     72              73             @Override  74             public void onClick(View v) {
     75                 // TODO Auto-generated method stub  76                 if(!isPlaying){
     77                     mService.start();  78                     isPlaying = true;  79                     playBT.setText("暂停");  80                     mHandler.post(seekBarThread);  81                 }else{
     82                     mService.pause();  83                     isPlaying = false;  84                     playBT.setText("播放");  85                     mHandler.removeCallbacks(seekBarThread);  86                 }  87             }  88         });  89          90     }  91      92     Runnable seekBarThread = new Runnable() {
     93          94         @Override  95         public void run() {
     96             // TODO Auto-generated method stub  97             seekBar.setProgress((mService.getCurrentPosition()*100)/mService.getDuration());  98             mHandler.postDelayed(seekBarThread, 200);  99         } 100     }; 101     102 }