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我有一个简单的代码，可以在单击按钮时录制视频。手动点击工作正常，但myButton.performClick()不起作用（应用程序停止）。我也尝试过 setPressed() 但它的点击不会产生任何影响。如果我直接启动 mediarecorder 而不点击任何按钮，那么应用程序也会崩溃。我一无所知。

     public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);

      recording = false;

      setContentView(R.layout.main);

      //Get Camera for preview
      myCamera = getCameraInstance();
      if(myCamera == null){
       Toast.makeText(AndroidVideoCapture.this,
         "Fail to get Camera",
         Toast.LENGTH_LONG).show();
      }

      myCameraSurfaceView = new MyCameraSurfaceView(this, myCamera);
      FrameLayout myCameraPreview = (FrameLayout)findViewById(R.id.videoview);
      myCameraPreview.addView(myCameraSurfaceView);

      myButton = (Button)findViewById(R.id.mybutton);
      myButton.setOnClickListener(myButtonOnClickListener); 

    myButton.performClick();
  }

 Button.OnClickListener myButtonOnClickListener
  = new Button.OnClickListener(){     
        @Override
        public void onClick(View v) {
         // TODO Auto-generated method stub
         if(recording){
                      // stop recording and release camera
                      mediaRecorder.stop();  // stop the recording
                      releaseMediaRecorder(); // release the MediaRecorder object

                      //Exit after saved
                      finish();
         }else{

          //Release Camera before MediaRecorder start
          releaseCamera();

                if(!prepareMediaRecorder()){
                 Toast.makeText(AndroidVideoCapture.this,
                   "Fail in prepareMediaRecorder()!\n - Ended -",
                   Toast.LENGTH_LONG).show();
                 finish();
                }

          mediaRecorder.start();
          recording = true;
          myButton.setText("STOP");
         }
}};

我的日志文件-

  05-16 12:40:35.680: E/MediaRecorderJNI(1710): Application lost the surface
05-16 12:40:35.680: E/AndroidRuntime(1710): in writeCrashedAppName, pkgName :com.exercise.AndroidVideoCapture
05-16 12:40:35.680: E/AndroidRuntime(1710): FATAL EXCEPTION: main
05-16 12:40:35.680: E/AndroidRuntime(1710): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.exercise.AndroidVideoCapture/com.exercise.AndroidVideoCapture.AndroidVideoCapture}: java.lang.NullPointerException
05-16 12:40:35.680: E/AndroidRuntime(1710):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
05-16 12:40:35.680: E/AndroidRuntime(1710):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
05-16 12:40:35.680: E/AndroidRuntime(1710):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
05-16 12:40:35.680: E/AndroidRuntime(1710):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
05-16 12:40:35.680: E/AndroidRuntime(1710):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-16 12:40:35.680: E/AndroidRuntime(1710):     at android.os.Looper.loop(Looper.java:130)
05-16 12:40:35.680: E/AndroidRuntime(1710):     at android.app.ActivityThread.main(ActivityThread.java:3683)
05-16 12:40:35.680: E/AndroidRuntime(1710):     at java.lang.reflect.Method.invokeNative(Native Method)
05-16 12:40:35.680: E/AndroidRuntime(1710):     at java.lang.reflect.Method.invoke(Method.java:507)
05-16 12:40:35.680: E/AndroidRuntime(1710):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:880)
05-16 12:40:35.680: E/AndroidRuntime(1710):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:638)
05-16 12:40:35.680: E/AndroidRuntime(1710):     at dalvik.system.NativeStart.main(Native Method)
05-16 12:40:35.680: E/AndroidRuntime(1710): Caused by: java.lang.NullPointerException
05-16 12:40:35.680: E/AndroidRuntime(1710):     at com.exercise.AndroidVideoCapture.AndroidVideoCapture$1.onClick(AndroidVideoCapture.java:145)
05-16 12:40:35.680: E/AndroidRuntime(1710):     at android.view.View.performClick(View.java:2485)
05-16 12:40:35.680: E/AndroidRuntime(1710):     at com.exercise.AndroidVideoCapture.AndroidVideoCapture.onCreate(AndroidVideoCapture.java:74)
05-16 12:40:35.680: E/AndroidRuntime(1710):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
05-16 12:40:35.680: E/AndroidRuntime(1710):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
05-1

6 12:40:35.680: E/AndroidRuntime(1710): ... 11 更多

4

1 回答 1

0

您要做的是在加载后立即开始录制。为什么要自动单击按钮，以将 onclick 内部的代码放入方法中并代替 myButton.performClick(); 调用那个方法

于 2013-05-16T08:51:07.867 回答