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POcamera for picture and video not working
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copied!<p>I am using camera in android app to take pictures and videos. I am using following code but it forces app to close. The LogCat and code is shown below. If anybody could help,it would be highly appreciated.</p> <p>LogCat:</p> <pre><code> 09-09 14:32:08.246: E/AndroidRuntime(4764): FATAL EXCEPTION: main 09-09 14:32:08.246: E/AndroidRuntime(4764): java.lang.NullPointerException 09-09 14:32:08.246: E/AndroidRuntime(4764): at com.example.cameravideo.VideoCaptureActivity.initRecorder(VideoCaptureActivity.java:72) 09-09 14:32:08.246: E/AndroidRuntime(4764): at com.example.cameravideo.VideoCaptureActivity.surfaceCreated(VideoCaptureActivity.java:100) 09-09 14:32:08.246: E/AndroidRuntime(4764): at android.view.SurfaceView.updateWindow(SurfaceView.java:571) 09-09 14:32:08.246: E/AndroidRuntime(4764): at android.view.SurfaceView.access$000(SurfaceView.java:86) 09-09 14:32:08.246: E/AndroidRuntime(4764): at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:175) 09-09 14:32:08.246: E/AndroidRuntime(4764): at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:833) 09-09 14:32:08.246: E/AndroidRuntime(4764): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1860) 09-09 14:32:08.246: E/AndroidRuntime(4764): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004) 09-09 14:32:08.246: E/AndroidRuntime(4764): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5481) 09-09 14:32:08.246: E/AndroidRuntime(4764): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 09-09 14:32:08.246: E/AndroidRuntime(4764): at android.view.Choreographer.doCallbacks(Choreographer.java:562) 09-09 14:32:08.246: E/AndroidRuntime(4764): at android.view.Choreographer.doFrame(Choreographer.java:532) 09-09 14:32:08.246: E/AndroidRuntime(4764): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 09-09 14:32:08.246: E/AndroidRuntime(4764): at android.os.Handler.handleCallback(Handler.java:730) 09-09 14:32:08.246: E/AndroidRuntime(4764): at android.os.Handler.dispatchMessage(Handler.java:92) </code></pre> <p>Code:</p> <pre><code> public class VideoCaptureActivity extends Activity implements SurfaceHolder.Callback { private final String VIDEO_PATH_NAME = "/mnt/sdcard/VGA_30fps_512vbrate.mp4"; private MediaRecorder mMediaRecorder; private Camera mCamera; private SurfaceView mSurfaceView; private SurfaceHolder mHolder; private View mToggleButton; private boolean mInitSuccesful; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); mSurfaceView = (SurfaceView) findViewById(R.id.surface_camera); mHolder = mSurfaceView.getHolder(); mHolder.addCallback(this); mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); mToggleButton = (ToggleButton) findViewById(R.id.toggleButton); mToggleButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { if (((ToggleButton) v).isChecked()) { mMediaRecorder.start(); try { Thread.sleep(10 * 1000); } catch (Exception e) { e.printStackTrace(); } finish(); } else { mMediaRecorder.stop(); mMediaRecorder.reset(); try { initRecorder(mHolder.getSurface()); } catch (IOException e) { e.printStackTrace(); } } } }); } private void initRecorder(Surface surface) throws IOException { if (mCamera == null) { mCamera = Camera.open(); mCamera.unlock(); } if (mMediaRecorder == null) mMediaRecorder = new MediaRecorder(); mMediaRecorder.setPreviewDisplay(surface); mMediaRecorder.setCamera(mCamera); mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT); mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264); mMediaRecorder.setVideoEncodingBitRate(512 * 1000); mMediaRecorder.setVideoFrameRate(30); mMediaRecorder.setVideoSize(640, 480); mMediaRecorder.setOutputFile(VIDEO_PATH_NAME); try { mMediaRecorder.prepare(); } catch (IllegalStateException e) { e.printStackTrace(); } mInitSuccesful = true; } @Override public void surfaceCreated(SurfaceHolder holder) { try { if (!mInitSuccesful) initRecorder(mHolder.getSurface()); } catch (IOException e) { e.printStackTrace(); } } @Override public void surfaceDestroyed(SurfaceHolder holder) { shutdown(); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) { } private void shutdown() { mMediaRecorder.reset(); mMediaRecorder.release(); mCamera.release(); mMediaRecorder = null; mCamera = null; } } </code></pre>

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