恢復後應用程序崩潰沒有異常

Question

我正在製作一個簡單的應用程序來顯示視頻和plaing音頻播放，如果活動在後臺。
我的應用程序工作正常，如果我只是關閉/打開屏幕。
當我在另一個應用程序製作完成後恢復我的應用程序時，它崩潰。 Log cat顯示沒有錯誤。

import android.app.Activity; 
import android.content.Intent; 
import android.media.MediaPlayer; 
import android.os.Bundle; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 

import com.squareup.otto.Subscribe; 

public class MainActivity 
     extends Activity 
     implements android.view.SurfaceHolder.Callback { 

    private SurfaceView surfaceViewFrame; 
    private SurfaceHolder holder; 
    private Bundle  extras; 
    private static final String TAG = "log_tag"; 
    private    boolean b = false; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     surfaceViewFrame = (SurfaceView) findViewById(R.id.surfaceView); 
     surfaceViewFrame.setClickable(false); 

     holder = surfaceViewFrame.getHolder(); 
     holder.addCallback(this); 


    } 


    @Subscribe 
    public void attachPlayer(MediaPlayer player) { 
     player.setDisplay(holder); 

    } 


    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { 

    } 


    public void surfaceCreated(SurfaceHolder holder) { 
     startService(new Intent(this, MediaPlayerService.class)); 

    } 


    public void surfaceDestroyed(SurfaceHolder holder) { 

    } 


    @Override 
    protected void onStart() { 
     super.onStart(); 
     BusProvider.getInstance().register(this); 
    } 


    @Override 
    protected void onStop() { 
     super.onStop(); 
     BusProvider.getInstance().unregister(this); 
    } 

服務

import android.app.Notification; 
import android.app.PendingIntent; 
import android.app.Service; 
import android.content.Intent; 
import android.media.MediaPlayer; 
import android.net.Uri; 
import android.os.IBinder; 
import android.util.Log; 

import java.io.IOException; 

public class MediaPlayerService 
     extends Service 
     implements MediaPlayer.OnPreparedListener, 
        MediaPlayer.OnCompletionListener, 

        MediaPlayer.OnSeekCompleteListener { 

    private static final String TAG = "MediaService"; 

    private static final String ACTION_PLAY = "com.example.action.PLAY"; 
    private MediaPlayer player; 
    public String[] 
      video_path = 
      {"https://ellovidsout.s3.amazonaws.com/1265/9/1422967594.mp4.m3u8", "https://ellovidsout.s3.amazonaws.com/1260/9/1422887544.mp4.m3u8"}; 


    @Override 
    public void onCreate() { 
     super.onCreate(); 
     player = new MediaPlayer(); 
     player.setOnPreparedListener(this); 
     player.setOnCompletionListener(this); 

     player.setOnSeekCompleteListener(this); 
     player.setScreenOnWhilePlaying(true); 

    } 


    @Override 
    public int onStartCommand(Intent intent, int flags, int startId) { 


     playVideo(); 

     Notification note = new Notification(
       R.drawable.ic_launcher, "Can you hear the music?", System.currentTimeMillis() 
     ); 
     Intent i = new Intent(this, MediaPlayerService.class); 
     i.setFlags(
       Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP 
     ); 
     PendingIntent pi = PendingIntent.getActivity(
       this, 0, i, 0 
     ); 
     note.setLatestEventInfo(
       this, "Fake Player", "Now Playing: \"Ummmm, Nothing\"", pi 
     ); 
     note.flags |= Notification.FLAG_NO_CLEAR; 
     startForeground(1337, note); 
     return super.onStartCommand(intent, flags, startId); 
    } 


    @Override 
    public IBinder onBind(Intent intent) { 

     return null; 
    } 


    @Override 
    public void onDestroy() { 
     super.onDestroy(); 
     player.stop(); 
     player.release(); 
     player = null; 
    } 


    private Thread playback = new Thread(
      new Runnable() { 

       public void run() { 
        try { 

         try { 
          player.setDataSource(
            MediaPlayerService.this, Uri.parse(
              video_path[0] 
            ) 
          ); 
          player.prepareAsync(); 
         } catch (IOException e) { 
          Log.e(TAG, "Error while playing video: " + e.getMessage()); 
         } 

        } catch (IllegalArgumentException e) { 
         Log.e(TAG, "Error while playing video: " + e.getMessage()); 
        } 
       } 
      } 
    ); 


    private void playVideo() { 
     if (player!=null&&!playback.isAlive()) playback.start(); 
    } 


    public void onPrepared(MediaPlayer mp) { 
     if (!player.isPlaying()) { 
      player.start(); 
      BusProvider.getInstance() 
        .post(player); 
     } 

    } 


    public void onCompletion(MediaPlayer mp) { 
     try { 
      player.setDataSource(
        MediaPlayerService.this, Uri.parse(
          video_path[0] 
        ) 
      ); 
     } catch (IOException e) { 
      Log.e(TAG, "Error while playing video: " + e.getMessage()); 

     } 
     player.prepareAsync(); 

    } 


    public void onSeekComplete(MediaPlayer mp) { 

    } 
} 

Answer 1

1. 你的onStop錯過：

   @Override protected void onStop() { holder.removeCallback(this); super.onStop(); }

2. 請加崩潰報告