Android开发之音乐播放器的实现

 1 import android.app.Activity;
 2 import android.content.ComponentName;
 3 import android.content.Intent;
 4 import android.content.ServiceConnection;
 5 import android.os.Bundle;
 6 import android.os.IBinder;
 7 import android.view.View;
 8 
 9 public class MainActivity extends Activity {
10 
11     private MyServiceConnection conn;
12     private MusicInterface mi;
13 
14     @Override
15     protected void onCreate(Bundle savedInstanceState) {
16         super.onCreate(savedInstanceState);
17         setContentView(R.layout.activity_main);
18 
19         Intent intent = new Intent(this, MusicService.class);
20         startService(intent);
21         conn = new MyServiceConnection();
　　　　　　startService(intent);   //把服务所在进程变成服务进程，防止activity销毁时，被杀掉
22         bindService(intent, conn, BIND_AUTO_CREATE);
23     }
24 
25     class MyServiceConnection implements ServiceConnection {
26 
27         @Override
28         public void onServiceConnected(ComponentName name, IBinder service) {
29             // TODO Auto-generated method stub
30             mi = (MusicInterface) service;
31         }
32 
33         @Override
34         public void onServiceDisconnected(ComponentName name) {
35             // TODO Auto-generated method stub
36 
37         }
38 
39     }
40 
41     public void play(View v) {
42         mi.play();
43 
44     }
45 
46     public void pause(View v) {
47         mi.pause();
48     }
49 }

 1 import android.app.Service;
 2 import android.content.Intent;
 3 import android.os.Binder;
 4 import android.os.IBinder;
 5 
 6 public class MusicService extends Service {
 7 
 8     @Override
 9     public IBinder onBind(Intent intent) {
10         // TODO Auto-generated method stub
11         return new MusicControl();
12     }
13 
14     class MusicControl extends Binder implements MusicInterface {
15         public void play() {
16             MusicService.this.play();
17         };
18 
19         public void pause() {
20             MusicService.this.pause();
21         }
22     }
23 
24     public void play() {
25         System.out.println("播放音乐");
26     }
27 
28     public void pause() {
29         System.out.println("暂停音乐");
30     }
31 
32 }

1 public interface MusicInterface {
2     
3     public void play();
4     public void pause();
5 
6 }