Activity与Service之间交互并播放歌曲

 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 }

  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((progressmService.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 }