android - 在 MediaController.show() 上崩溃

Question

我的媒体 Controller 有问题，这部分代码在 Acer Liquid( Gingerbread )、Archos 43(froyo)和 Archos 32(froyo)等不同设备上完美运行......

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 Point of View Pro Tab2( Gingerbread )上它会在 Activity 开始时崩溃。

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

问题出在 mediacontroller 类的函数 show() 中。我该如何解决？谢谢。

Answer 1

我在 3.1 Honeycomb 上遇到了类似的问题，并使用 setMediaPlayer 解决了它。使用 setMediaPlayer 按此顺序尝试您的代码。

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();