1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 | public class PlayMusic extends Activity implements OnClickListener { private static final String TAG = "PlayMusic" ; private Button playBtn; private Button stopBtn; private Button pauseBtn; private Button exitBtn; private Button closeBtn; //....(详见源码) @Override public void onClick(View v) { int op = - 1 ; Intent intent = new Intent( "org.allin.android.musicService" ); //广播用 // Intent intent = new Intent("org.allin.android.musicReceiver"); switch (v.getId()) { case R.id.play: Log.d(TAG, "onClick: playing muic" ); op = 1 ; break ; case R.id.stop: Log.d(TAG, "onClick: stoping music" ); op = 2 ; break ; case R.id.pause: Log.d(TAG, "onClick: pausing music" ); op = 3 ; break ; case R.id.close: Log.d(TAG, "onClick: close" ); this .finish(); break ; case R.id.exit: Log.d(TAG, "onClick: exit" ); op = 4 ; stopService(intent); this .finish(); break ; } Bundle bundle = new Bundle(); bundle.putInt( "op" , op); intent.putExtras(bundle); startService(intent); // sendBroadcast(intent); } } |
通过重写onClick方法来实现对播放音乐的控制。这里把播放音乐的各种操作用数字的方式通过Intent传递给service。
构造一个Intent ,ntent intent = new Intent("org.allin.android.musicService");
"org.allin.android.musicService"是在AndroidManifest.xml文件中对service类的定义
1 2 3 4 5 | <service android:enabled= "true" android:name= ".MusicService" > <intent-filter> <action android:name= "org.allin.android.musicService" /> </intent-filter> </service> |
把操作码放在Bundle中
Bundle bundle = new Bundle();
bundle.putInt("op", op);
intent.putExtras(bundle);
最后使用startService(intent);启动服务。
下面看看Service是怎么实现的。
MusicService.java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 | /** * @author allin.dev * */ public class MusicService extends Service { private static final String TAG = "MyService" ; private MediaPlayer mediaPlayer; /* * (non-Javadoc) * * @see android.app.Service#onBind(android.content.Intent) */ @Override public IBinder onBind(Intent arg0) { return null ; } @Override public void onCreate() { Log.v(TAG, "onCreate" ); if (mediaPlayer == null ) { mediaPlayer = MediaPlayer.create( this , R.raw.tmp); mediaPlayer.setLooping( false ); } } @Override public void onDestroy() { Log.v(TAG, "onDestroy" ); if (mediaPlayer != null ) { mediaPlayer.stop(); mediaPlayer.release(); } } @Override public void onStart(Intent intent, int startId) { Log.v(TAG, "onStart" ); if (intent != null ) { Bundle bundle = intent.getExtras(); if (bundle != null ) { int op = bundle.getInt( "op" ); switch (op) { case 1 : play(); break ; case 2 : stop(); break ; case 3 : pause(); break ; } } } } public void play() { if (!mediaPlayer.isPlaying()) { mediaPlayer.start(); } } public void pause() { if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.pause(); } } public void stop() { if (mediaPlayer != null ) { mediaPlayer.stop(); try { // 在调用stop后如果需要再次通过start进行播放,需要之前调用prepare函数 mediaPlayer.prepare(); } catch (IOException ex) { ex.printStackTrace(); } } } } |
1 2 3 4 5 | <receiver android:name= ".MusicReceiver" > <intent-filter> <action android:name= "org.allin.android.musicReceiver" /> </intent-filter> </receiver> |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | /** * @author allin.dev * */ public class MusicReceiver extends BroadcastReceiver { private static final String TAG = "MusicReceiver" ; @Override public void onReceive(Context context, Intent intent) { Log.d(TAG, "onReceive" ); Intent it = new Intent( "org.allin.android.musicService" ); Bundle bundle = intent.getExtras(); it.putExtras(bundle); if (bundle != null ){ int op = bundle.getInt( "op" ); if (op == 4 ){ context.stopService(it); } else { context.startService(it); } } } } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | public class PlayBindMusic extends Activity implements OnClickListener { private static final String TAG = "PlayBindMusic" ; private Button playBtn; private Button stopBtn; private Button pauseBtn; private Button exitBtn; private BindMusicService musicService; @Override public void onClick(View v) { switch (v.getId()) { case R.id.play: Log.d(TAG, "onClick: binding srvice" ); musicService.play(); break ; case R.id.stop: Log.d(TAG, "onClick: stoping srvice" ); if (musicService != null ){ musicService.stop(); } break ; case R.id.pause: Log.d(TAG, "onClick: pausing srvice" ); if (musicService != null ){ musicService.pause(); } break ; case R.id.exit: Log.d(TAG, "onClick: exit" ); this .finish(); break ; } } private void connection(){ Log.d(TAG, "connecting....." ); Intent intent = new Intent( "org.allin.android.bindService" ); bindService(intent, sc, Context.BIND_AUTO_CREATE); } private ServiceConnection sc = new ServiceConnection() { @Override public void onServiceDisconnected(ComponentName name) { musicService = null ; Log.d(TAG, "in onServiceDisconnected" ); } @Override public void onServiceConnected(ComponentName name, IBinder service) { musicService = ((BindMusicService.MyBinder)(service)).getService(); if (musicService != null ){ musicService.play(); } Log.d(TAG, "in onServiceConnected" ); } }; } |
这里使用了bindService(intent, sc, Context.BIND_AUTO_CREATE);来启动服务的,
我们需要定义ServiceConnectionnn,并实现里面的方法,当服务绑定成功后会调用ServiceConnectionnn中的回调函数:
public void onServiceConnected(ComponentName name, IBinder service),
回
调函数里面使用musicService =
((BindMusicService.MyBinder)(service)).getService();来获取BindMusicService服
务对象,有了BindMusicService实例对象,就可以调用服务提供的各种控制音乐播放的哦功能。
下面看看BindMusicService.java的实现:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 | /** * @author allin.dev */ public class BindMusicService extends Service { private static final String TAG = "MyService" ; private MediaPlayer mediaPlayer; private final IBinder binder = new MyBinder(); public class MyBinder extends Binder { BindMusicService getService() { return BindMusicService. this ; } } /* * (non-Javadoc) * * @see android.app.Service#onBind(android.content.Intent) */ @Override public IBinder onBind(Intent intent) { Log.d(TAG, "onBind" ); play(); return binder; } @Override public void onCreate() { super .onCreate(); Log.d(TAG, "onCreate" ); Toast.makeText( this , "show media player" , Toast.LENGTH_SHORT).show(); } @Override public void onDestroy() { super .onDestroy(); Log.d(TAG, "onDestroy" ); Toast.makeText( this , "stop media player" , Toast.LENGTH_SHORT); if (mediaPlayer != null ){ mediaPlayer.stop(); mediaPlayer.release(); } } public void play() { if (mediaPlayer == null ) { mediaPlayer = MediaPlayer.create( this , R.raw.tmp); mediaPlayer.setLooping( false ); } if (!mediaPlayer.isPlaying()) { mediaPlayer.start(); } } public void pause() { if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.pause(); } } public void stop() { if (mediaPlayer != null ) { mediaPlayer.stop(); try { // 在调用stop后如果需要再次通过start进行播放,需要之前调用prepare函数 mediaPlayer.prepare(); } catch (IOException ex) { ex.printStackTrace(); } } } } |
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