【发布时间】：2016-03-28 12:52:54
【问题描述】：
我正在我的应用中制作音频播放器。它正在使用视图列表，并且一切正常。我可以开始暂停，下一个音乐流。我正在加载一个 url 来播放音乐。当我关闭应用程序时，音乐停止播放。我需要继续玩。我读过一些关于音频焦点的东西。但我不确定如何将其添加到代码中。我的清单中有wake_lock。
我对 android 很陌生，所以它是反复无常的，但这个我就是想不通。此外，当我关闭应用程序并在播放音乐时重新启动它并重新启动时，应用程序崩溃。
public void controlMusicPlayer(String musicUrl) {
final String playUrl = musicUrl;
Log.d("Song url received:", playUrl);
if (!mediaPlayer.isPlaying()) {
playercontrol.setVisibility(View.VISIBLE);
btn.setBackgroundResource(R.drawable.pause);
new Player()
.execute(playUrl);
playPause = true;
Log.d("Play State:", "Starting song");
} else {
Log.d("Play State:", "Next song is being started");
playPause = true;
mediaPlayer.reset();
btn.setBackgroundResource(R.drawable.pause);
if (mediaPlayer.isPlaying())
mediaPlayer.pause();
playPause = false;
new Player()
.execute(playUrl);
}
}
public View.OnClickListener pausePlay = new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!playPause) {
btn.setBackgroundResource(R.drawable.pause);
if (intialStage)
new Player()
.execute(Urlmusic);
else {
if (!mediaPlayer.isPlaying())
mediaPlayer.start();
}
playPause = true;
} else {
btn.setBackgroundResource(R.drawable.play);
if (mediaPlayer.isPlaying())
mediaPlayer.pause();
playPause = false;
}
}
};
/**
* preparing mediaplayer will take sometime to buffer the content so prepare it inside the background thread and starting it on UI thread.
* @author piyush
*
*/
class Player extends AsyncTask<String, Void, Boolean> {
private ProgressDialog progress;
@Override
protected Boolean doInBackground(String... params) {
// TODO Auto-generated method stub
Boolean prepared;
try {
mediaPlayer.setDataSource(params[0]);
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
// TODO Auto-generated method stub
intialStage = true;
playPause=false;
btn.setBackgroundResource(R.drawable.play);
mediaPlayer.stop();
mediaPlayer.reset();
}
});
mediaPlayer.prepare();
prepared = true;
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
Log.d("IllegarArgument", e.getMessage());
prepared = false;
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
prepared = false;
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
prepared = false;
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
prepared = false;
e.printStackTrace();
}
return prepared;
}
@Override
protected void onPostExecute(Boolean result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
if (progress.isShowing()) {
progress.cancel();
}
Log.d("Prepared", "//" + result);
mediaPlayer.start();
intialStage = false;
}
public Player() {
progress = new ProgressDialog(MainActivity.this);
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
this.progress.setMessage("Buffering...");
this.progress.show();
}
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
if (mediaPlayer != null) {
mediaPlayer.reset();
mediaPlayer.release();
mediaPlayer = null;
}
}
////////////////////////////////// end music play list /////////////////////////////////////////
感谢您的帮助。
【问题讨论】：
-
你应该使用服务来播放音频，而不是仅仅在活动中播放。
标签： java android audio android-studio