Crash on MediaController.show（）

Question

我有一個媒體控制器的問題，這部分代碼在不同的設備上完美地工作，如宏碁液體（薑餅），愛可視43（Froyo）和愛可視32（Froyo）...

VideoView videoView = (VideoView) findViewById(R.id.videoView1); 
MediaController mediaController = new MediaController(this); 
mediaController.setAnchorView(videoView); 
File filevideo = new File(Environment.getExternalStorageDirectory() + "/edizionitsm/firenze/map_" + map_n + "/",filename + "_" + language + ".mp4"); 
Uri video = Uri.fromFile(filevideo); 
videoView.setMediaController(mediaController); 
videoView.setVideoURI(video); 
videoView.start(); 

......但是在視角臨表2（薑餅）它在活動開始時崩潰。

11-09 14:12:59.640: E/AndroidRuntime(31433): FATAL EXCEPTION: main 
11-09 14:12:59.640: E/AndroidRuntime(31433): java.lang.RuntimeException: Unable to start activity ComponentInfo{edizionitsm.archeoplayer/edizionitsm.archeoplayer.Player}: java.lang.NullPointerException 
11-09 14:12:59.640: E/AndroidRuntime(31433): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at android.os.Handler.dispatchMessage(Handler.java:99) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at android.os.Looper.loop(Looper.java:123) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at android.app.ActivityThread.main(ActivityThread.java:3683) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at java.lang.reflect.Method.invokeNative(Native Method) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at java.lang.reflect.Method.invoke(Method.java:507) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at dalvik.system.NativeStart.main(Native Method) 
11-09 14:12:59.640: E/AndroidRuntime(31433): Caused by: java.lang.NullPointerException 
11-09 14:12:59.640: E/AndroidRuntime(31433): at android.widget.MediaController.disableUnsupportedButtons(MediaController.java:640) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at android.widget.MediaController.show(MediaController.java:674) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at android.widget.MediaController.show(MediaController.java:631) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at android.widget.VideoView.start(VideoView.java:962) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at edizionitsm.archeoplayer.Player.onCreate(Player.java:48) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
11-09 14:12:59.640: E/AndroidRuntime(31433): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
11-09 14:12:59.640: E/AndroidRuntime(31433): ... 11 more 

問題出在mediacontroller類的show（）函數中。我該如何解決它？ 謝謝。

Answer 1

我在3.1 Honeycomb上有類似的問題，並使用setMediaPlayer來解決它。使用setMediaPlayer按此順序嘗試您的代碼。

VideoView videoView = (VideoView) findViewById(R.id.videoView1); 
MediaController mediaController = new MediaController(this); 
mediaController.setAnchorView(videoView); 

mediaController.setMediaPlayer(videoView); 

File filevideo = new File(Environment.getExternalStorageDirectory() + "/edizionitsm/firenze/map_" + map_n + "/",filename + "_" + language + ".mp4"); 
Uri video = Uri.fromFile(filevideo); 
videoView.setMediaController(mediaController); 
videoView.setVideoURI(video); 
videoView.start();