问题:

I've got a simple activity which plays video through VideoView

public class AVideo extends Activity { private VideoView mVideoView; private MediaController mc;  @Override public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.a_video);     Bundle extras = getIntent().getExtras();     Uri path = Uri.parse(extras.getString("videoURI"));     mVideoView = (VideoView) findViewById(R.id.video);     mVideoView.setVideoURI(path);     mc = new MediaController(this);     mVideoView.setMediaController(mc); }  @Override protected void onResume() {     super.onResume();     mVideoView.start();     mc.show(); } }

In some cases when user pushes back button, on this activity, before video starts playing, he's got ANR. Here's my traces:

DALVIK THREADS: "main" prio=5 tid=3 NATIVE | group="main" sCount=1 dsCount=0 s=N obj=0x4001b268 self=0xbd00 | sysTid=423 nice=0 sched=0/0 cgrp=default handle=-1344001384 at android.media.MediaPlayer._reset(Native Method) at android.media.MediaPlayer.reset(MediaPlayer.java:1028) at android.widget.VideoView.release(VideoView.java:476) at android.widget.VideoView.access$2100(VideoView.java:49) at android.widget.VideoView$6.surfaceDestroyed(VideoView.java:467) at android.view.SurfaceView.reportSurfaceDestroyed(SurfaceView.java:488) at android.view.SurfaceView.updateWindow(SurfaceView.java:413) at android.view.SurfaceView.onWindowVisibilityChanged(SurfaceView.java:189) at android.view.View.dispatchWindowVisibilityChanged(View.java:3782) at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:692) at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:692) at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:692) at android.view.ViewRoot.performTraversals(ViewRoot.java:706) at android.view.ViewRoot.handleMessage(ViewRoot.java:1633) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:123) at android.app.ActivityThread.main(ActivityThread.java:4363) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:521) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) at dalvik.system.NativeStart.main(Native Method)

Also logcat shows this:

07-01 15:11:40.408: WARN/libutils.threads(2967): Thread (this=0x22818): don't call waitForExit() from this Thread object's thread. It's a guaranteed deadlock!

I find this question and this bug, but there are no solution.

回答1:

If you are getting the ANR message, means that your applicaction is insufficiently responsive for a period of time, use runOnUiThread to run the specified action on the UI thread or Asynctask

    public class AVideo extends Activity {     private VideoView mVideoView;     private MediaController mc;      @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.a_video);         Bundle extras = getIntent().getExtras();         Uri path = Uri.parse(extras.getString("videoURI"));         mVideoView = (VideoView) findViewById(R.id.video);          runOnUiThread(new Runnable() {                     @Override                     public void run() {                                              mVideoView.setVideoURI(path);                     }                 });          mc = new MediaController(this);         mVideoView.setMediaController(mc);     }      @Override     protected void onResume() {         super.onResume();         mVideoView.start();         mc.show();     }   }

Try implementing setOnPreparedListener to start the video.

    mVideoView.setOnCompletionListener(new OnCompletionListener() {                          @Override         public void onCompletion(MediaPlayer mp) {             Log.i("VIDEO", "onCompletion");                          }     });     mVideoView.setOnPreparedListener(new OnPreparedListener() {                      @Override         public void onPrepared(MediaPlayer mp) {             Log.i("VIDEO", "onPrepared");               if(mVideoView.canSeekForward()) mVideoView.seekTo(mVideoView.getDuration()/5);                mVideoView.start();                            }     });     mVideoView.setKeepScreenOn(true);

回答2:

One technique that prevents the Android system from concluding a code that has been responsive for a long period of time is to create a child thread. Within the child thread, most of the actual workings of the codes can be placed, so that the main thread runs with minimal periods of unresponsive times.

回答3:

public class AVideo extends Activity { private VideoView mVideoView; private MediaController mc;  @Override public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.a_video);     Bundle extras = getIntent().getExtras();     Uri path = Uri.parse(extras.getString("videoURI"));     mVideoView = (VideoView) findViewById(R.id.video);     mVideoView.setVideoURI(path);     mc = new MediaController(this);     mVideoView.setMediaController(mc); }  @Override protected void onResume() {     super.onResume();     mVideoView.start();     mc.show(); }  }

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