[英]how to pass an ArrayList<String> from an Activity to a service in android?
[英]Pass an arraylist of strings from activity to service in Android
我已经制作了一个实现MediaPlayer
的功能性 android 应用程序,我知道现在已经晚了,但总比没有好,我想实现一个服务,以便能够在其他应用程序上进行multitasking
时播放媒体。
有没有办法如何将例如String
的ArrayList
从活动传递到service
? 我发现的是有关通过parcelable
传递的Custom Objects
信息,我认为这不是必需的。
例如,我是如何开始过渡的:
public class PlayerService extends Service implements MediaPlayer.OnPreparedListener{
private static final String ACTION_PLAY = "action.PLAY";
private static final String ACTION_PAUSE = "action.PAUSE";
private MediaPlayer mediaPlayer = null;
@Override
public void onCreate() {
mediaPlayer = new MediaPlayer();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (intent.getAction().equals(ACTION_PLAY)) {
try {
if(mediaPlayer.isPlaying()) {
mediaPlayer.stop();
}
mediaPlayer.reset();
mediaPlayer.setDataSource(musicUrl.get(position));
mediaPlayer.setOnPreparedListener(this);
mediaPlayer.prepareAsync();
} catch (IOException e) {
e.printStackTrace();
}
// setCurrentSong(myDataList.get(position));
// morphButton.setState(MorphButton.MorphState.START);
//
// setHighlight(myDataList.get(currentPosition));
}
return START_STICKY;
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onPrepared(MediaPlayer mp) {
}
}
如您所见,我需要从ArrayList
获取音乐 URL 以准备 de MediaPlayer
在您绑定到服务的活动中,您可以通过意图添加一个ArrayList<String>
:
ServiceConnection serviceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
}
@Override
public void onServiceDisconnected(ComponentName componentName) {
}
};
ArrayList<String> stringList = new ArrayList<>();
stringList.add("a");
stringList.add("b");
Intent i = new Intent(this, BLEDiscoveryService.class);
i.putStringArrayListExtra("list", stringList);
bindService(new Intent(this, MyService.class), serviceConnection, BIND_AUTO_CREATE);
在您的服务的onBind()
您可以从传递的意图中检索它。
public class LocalBinder extends Binder {
public MyService getService() {
return MyService.this;
}
}
@Override
public void onCreate() {
super.onCreate();
binder = new LocalBinder();
}
@Override
public IBinder onBind(Intent intent) {
ArrayList<String> stringList = intent.getStringArrayListExtra("list");
return binder;
}
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