【发布时间】：2013-12-10 23:46:57
【问题描述】：
我有一个在后台播放音乐的媒体播放器服务，该服务是从一个活动中调用的。现在当我前。退出那个活动，然后再回到它，我想看看状态是什么，播放了什么歌曲等。
这是我的服务中的代码：
public class MediaPlayerService extends Service implements
OnCompletionListener, OnClickListener {
MediaPlayer mediaPlayer;
String url;
int mediaPos, mediaMax, position;
boolean isShufle;
WeakReference<SeekBar> seekbar;
WeakReference<TextView> reciter, songTitle, songPos;
private WeakReference<ImageView> play, forward, backward;
ArrayList<Songs> songs;
Handler handler;
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
// mediaPlayer = MediaPlayer.create(this,url);// raw/s.mp3
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
}
private void play(final int position) throws IllegalArgumentException,
SecurityException, IllegalStateException, IOException {
/*
* dialog = ProgressDialog.show(AlbumDetails.this, "",
* getString(com.darkovski.quran.R.string.buffering), true);
* dialog.setCancelable(true); dialog.show();
*/
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setDataSource(songs.get(position).getLink());
// prepare track
mediaPlayer.prepare();
mediaPlayer.setOnPreparedListener(new OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
play.get().setImageResource(R.drawable.pause);
// play.setImageResource(R.drawable.pause);
// this is new
mediaPos = mp.getCurrentPosition();
mediaMax = mp.getDuration();
reciter.get().setText(songs.get(position).getRecitorName());
songTitle.get().setText(songs.get(position).getTitle());
songPos.get().setText((position + 1) + " of 114");
seekbar.get().setMax(mediaMax);
seekbar.get().setProgress(mediaPos);
handler.removeCallbacks(moveSeekBarThread);
handler.postDelayed(moveSeekBarThread, 100);
mp.start();
// dialog.dismiss();
}
});
// when truck finishes
mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
// if(shuffle)
try {
if (isShufle) {
play(new Random().nextInt(songs.size()));
} else {
if (position == songs.size())
play(0);
else
play(position + 1);
}
AlbumDetails.position += 1;
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
url = intent.getStringExtra("url");
handler = new Handler();
position = intent.getIntExtra("position", -1);
forward = new WeakReference<ImageView>(AlbumDetails.forward);
backward = new WeakReference<ImageView>(AlbumDetails.backward);
play = new WeakReference<ImageView>(AlbumDetails.play);
play.get().setOnClickListener(this);
forward.get().setOnClickListener(this);
backward.get().setOnClickListener(this);
seekbar = new WeakReference<SeekBar>(AlbumDetails.seekbar);
reciter = new WeakReference<TextView>(AlbumDetails.reciter);
songTitle = new WeakReference<TextView>(AlbumDetails.songTitle);
songPos = new WeakReference<TextView>(AlbumDetails.songPos);
songs = AlbumDetails.songs;
seekbar.get().setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
if (fromUser && mediaPlayer.isPlaying()) {
mediaPlayer.seekTo(progress);
}
}
});
/*
* try { mediaPlayer.setDataSource(url); mediaPlayer.prepare();
* mediaPlayer.setOnCompletionListener(this); } catch
* (IllegalArgumentException e) { // TODO Auto-generated catch block
* e.printStackTrace(); } catch (SecurityException e) { // TODO
* Auto-generated catch block e.printStackTrace(); } catch
* (IllegalStateException e) { // TODO Auto-generated catch block
* e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated
* catch block e.printStackTrace(); } if (!mediaPlayer.isPlaying()) {
* mediaPlayer.start(); }
*/
try {
play(position);
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return START_STICKY;
}
public void onDestroy() {
if (mediaPlayer.isPlaying()) {
mediaPlayer.stop();
}
mediaPlayer.release();
}
public void onCompletion(MediaPlayer _mediaPlayer) {
stopSelf();
}
private Runnable moveSeekBarThread = new Runnable() {
public void run() {
if (mediaPlayer.isPlaying()) {
int mediaPos_new = mediaPlayer.getCurrentPosition();
int mediaMax_new = mediaPlayer.getDuration();
seekbar.get().setMax(mediaMax_new);
seekbar.get().setProgress(mediaPos_new);
handler.postDelayed(this, 100);
}
}
};
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.playeer_back:
try {
if (mediaPlayer != null)
if (mediaPlayer.isPlaying()) {
mediaPlayer.stop();
mediaPlayer.release();
}
if (position - 1 < 0) {
play(songs.size());
position = songs.size();
} else
play(position - 1);
} catch (IllegalArgumentException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
} catch (SecurityException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
} catch (IllegalStateException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
} catch (IOException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
break;
case R.id.playeer_forward:
try {
if (mediaPlayer != null)
if (mediaPlayer.isPlaying()) {
mediaPlayer.stop();
mediaPlayer.release();
}
play(position + 1);
position += 1;
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case R.id.playeer_play:
if (mediaPlayer == null) {
try {
play(position);
} catch (IllegalArgumentException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (SecurityException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IllegalStateException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
} else if (mediaPlayer.isPlaying()) {
mediaPlayer.pause();
play.get().setImageResource(R.drawable.pause);
} else if (mediaPlayer != null) {
mediaPlayer.start();
play.get().setImageResource(R.drawable.play_play);
}
// playFunction();
break;
}
}
}
还有我的活动代码 - onClick：
case R.id.playeer_play:
playbackServiceIntent
.putExtra("url", songs.get(position).getLink());
playbackServiceIntent
.putExtra("position", position);
startService(playbackServiceIntent);
break;
【问题讨论】：
-
你的问题是什么？
-
@CommonsWare 抱歉，如果我不清楚，我会通过该服务在活动中播放歌曲。现在前。当我退出该活动并返回搜索栏时，位置，歌曲名称等信息都会丢失。我需要以某种方式引用它，以便当我回到播放器屏幕时所有数据都在那里。
-
我的意思是，这不是问题。如果您隐含的问题是“我该怎么做？”，您尝试过什么，遇到过哪些具体问题？
-
@CommonsWare 是的，问题是我不知道我应该尝试什么才能达到预期的效果
标签： android android-service instance