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POmethod called after release() exception unable to resume with android camera
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copied!<p>While developing a camera app I've encountered an exception that only happened when I switch to other app (<code>onPause()</code> for my app).</p> <pre><code>01-15 17:22:15.017: E/AndroidRuntime(14336): FATAL EXCEPTION: main 01-15 17:22:15.017: E/AndroidRuntime(14336): java.lang.RuntimeException: Method called after release() 01-15 17:22:15.017: E/AndroidRuntime(14336): at android.hardware.Camera.setPreviewDisplay(Native Method) 01-15 17:22:15.017: E/AndroidRuntime(14336): at android.hardware.Camera.setPreviewDisplay(Camera.java:357) 01-15 17:22:15.017: E/AndroidRuntime(14336): at com.sora.cbir.yuki.image.leaf.CameraPreview.surfaceCreated(CameraPreview.java:32) 01-15 17:22:15.017: E/AndroidRuntime(14336): at android.view.SurfaceView.updateWindow(SurfaceView.java:551) 01-15 17:22:15.017: E/AndroidRuntime(14336): at android.view.SurfaceView.onWindowVisibilityChanged(SurfaceView.java:213) 01-15 17:22:15.017: E/AndroidRuntime(14336): at android.view.View.dispatchWindowVisibilityChanged(View.java:4075) 01-15 17:22:15.017: E/AndroidRuntime(14336): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:742) 01-15 17:22:15.017: E/AndroidRuntime(14336): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:742) 01-15 17:22:15.017: E/AndroidRuntime(14336): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:742) 01-15 17:22:15.017: E/AndroidRuntime(14336): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:742) 01-15 17:22:15.017: E/AndroidRuntime(14336): at android.view.ViewRoot.performTraversals(ViewRoot.java:858) 01-15 17:22:15.017: E/AndroidRuntime(14336): at android.view.ViewRoot.handleMessage(ViewRoot.java:1995) 01-15 17:22:15.017: E/AndroidRuntime(14336): at android.os.Handler.dispatchMessage(Handler.java:99) 01-15 17:22:15.017: E/AndroidRuntime(14336): at android.os.Looper.loop(Looper.java:150) 01-15 17:22:15.017: E/AndroidRuntime(14336): at android.app.ActivityThread.main(ActivityThread.java:4389) 01-15 17:22:15.017: E/AndroidRuntime(14336): at java.lang.reflect.Method.invokeNative(Native Method) 01-15 17:22:15.017: E/AndroidRuntime(14336): at java.lang.reflect.Method.invoke(Method.java:507) 01-15 17:22:15.017: E/AndroidRuntime(14336): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849) 01-15 17:22:15.017: E/AndroidRuntime(14336): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607) 01-15 17:22:15.017: E/AndroidRuntime(14336): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>I did some research and found out that I need to add</p> <pre><code>mCamera.setPreviewCallback(null); </code></pre> <p>as a workaround for Android's camera stack</p> <p>my <code>onPause()</code> now looks like this:</p> <pre><code>@Override protected void onPause() { super.onPause(); try { // release the camera immediately on pause event //releaseCamera(); mCamera.stopPreview(); mCamera.setPreviewCallback(null); mCamera.release(); mCamera = null; } catch(Exception e) { e.printStackTrace(); } } </code></pre> <p>and my <code>onResume()</code>:</p> <pre><code>@Override protected void onResume() { super.onResume(); try { mCamera.setPreviewCallback(null); mCamera = getCameraInstance(); //mCamera.setPreviewCallback(null); mPreview = new CameraPreview(Imageupload.this, mCamera);//set preview preview.addView(mPreview); } catch (Exception e){ Log.d(TAG, "Error starting camera preview: " + e.getMessage()); } } } </code></pre> <p>and finally my <code>getCameraInstance()</code> method:</p> <pre><code>public Camera getCameraInstance(){ Camera camera = null; try { camera = Camera.open(); // attempt to get a Camera instance } catch (Exception e){ // Camera is not available (in use or does not exist) } Camera.Parameters parameters = camera.getParameters(); //mPreviewSize = getBestPreviewSize(parameters, wt, ht); //mPictureSize = getBestPictureSize(parameters, wt, ht); //Shift W & H => if camera rotates 90 deg mPreviewSize = getOptimalPreviewSize(parameters, wt, ht); //original => wt,ht mPictureSize = getOptimalPictureSize(parameters, wt, ht); //original => wt,ht Log.d("CAMERA", "SCREEN RESOLUTION H: "+ht); Log.d("CAMERA", "SCREEN RESOLUTION W: "+wt); Log.d("CAMERA", "PREVIEW RESOLUTION H: "+mPreviewSize.height); Log.d("CAMERA", "PREVIEW RESOLUTION W: "+mPreviewSize.width); Log.d("CAMERA", "PICTURE RESOLUTION H: "+mPictureSize.height); Log.d("CAMERA", "PICTURE RESOLUTION W: "+mPictureSize.width); //set preview size based on device screen parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height); //set picture size based on device screen parameters.setPictureSize(mPictureSize.width, mPictureSize.height); //set output camera mode parameters.setPictureFormat(PixelFormat.JPEG); //set focous mode parameters.setFocusMode(FOCUS_MODE_AUTO); //set flash mode parameters.setFlashMode("auto"); List<int[]> fps = parameters.getSupportedPreviewFpsRange(); //System.out.println("FPS size: " +fps.size()); //System.out.println("MAX FPS:"+(fps.get(fps.size()-1)[1])/1000); //log min and max camera supported fps Log.d("CAMERA", "CAMERA MAX FPS: "+(fps.get(fps.size()-1)[1])/1000); Log.d("CAMERA", "CAMERA MIN FPS: "+(fps.get(fps.size()-1)[0])/1000); if(camera_fps) { parameters.setPreviewFpsRange(fps.get(fps.size()-1)[1], fps.get(fps.size()-1)[1]); } //set camera parameters camera.setParameters(parameters); Toast.makeText(getApplicationContext(), "Your device are capable of previewing @" + fps.get(fps.size()-1)[1]/1000+"fps!",Toast.LENGTH_SHORT).show(); return camera; // returns null if camera is unavailable } </code></pre> <p>any ideas on how to fix this?</p>

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