Android应用开发记录-字幕播放器（3）工程包

package SubtitlePlayer.xwg; import android.content.ComponentName; import android.content.Context; import android.content.ContextWrapper; import android.content.Intent; import android.content.ServiceConnection; import android.os.IBinder; public class MusicPlaybackServiceProxy { private ContextWrapper mContextWrapper= null; private MusicPlaybackService mPlaybackService = null ; private ServiceConnection mPlaybackConnection = new ServiceConnection() { public void onServiceConnected(ComponentName className, IBinder service) { mPlaybackService = ((MusicPlaybackService.LocalBinder)service).getService(); } public void onServiceDisconnected(ComponentName className) { mPlaybackService = null ; } }; MusicPlaybackServiceProxy(ContextWrapper cw){ mContextWrapper = cw; } void startAndBindService(){ mContextWrapper.startService(new Intent(mContextWrapper ,MusicPlaybackService.class)); mContextWrapper.bindService(new Intent(mContextWrapper, MusicPlaybackService.class), mPlaybackConnection, Context.BIND_AUTO_CREATE); } void stopService(){ if(mPlaybackService != null){ mContextWrapper.stopService(new Intent(mContextWrapper ,MusicPlaybackService.class)); } } public void setDataSource(String path) { mPlaybackService.setDataSource(path); } public String getDataSource(){ if(mPlaybackService != null){ return mPlaybackService.getDataSource(); }else{ return null; } } public void start() { if(mPlaybackService != null){ mPlaybackService.start(); } } public void stop(){ if(mPlaybackService != null){ mPlaybackService.stop(); } } public void pause() { if(mPlaybackService != null){ mPlaybackService.pause(); } } public void resume() { if(mPlaybackService != null){ mPlaybackService.start(); } } public boolean isPlaying() { if(mPlaybackService != null){ return mPlaybackService.isPlaying(); }else{ return false; } } public int getDuration() { if(mPlaybackService != null){ return mPlaybackService.getDuration(); }else{ return 0; } } public int getPosition() { if(mPlaybackService != null){ return mPlaybackService.getPosition(); }else{ return 0; } } public long seek(long whereto) { if(mPlaybackService != null){ return mPlaybackService.seek(whereto); }else{ return 0; } } };