surfaceview

Just a general question: I have a Fragment which has a SurfaceView. When I hide the Fragment by the FragmentManager, the SurfaceView is still visible. I found a workaround by just setting the View to INVISIBLE/GONE/VISIBLE when the Fragment is hidden/visible - but I'm wondering: Why is the SurfaceView still shown? Is it because the SurfaceView basically is a "punched hole", which means, it's not in the Layout-Hierarchy of the Fragment and therefore can't be hidden when the Layout is hidden? What is the hiding-procedure doing with the Fragment? Does it simply sets the created view to gone? A

does anybody know the difference between pressing the power button and the home button? In my app, I've tried putting a debugging statement in every lifecycle of the activity and both result the same, that is, the activity will be onPause and will be onRestart then onResume when the activity is re-opened (if we press home button earlier) or when we turn on the device again by pressing the power button (if we press power button earlier). Having this same behaviour/sequence, I expected my camera app to run the same in both cases. But it's not. I used surfaceview to preview to camera. If the

I'm writing an android app. I encounter the following problem: app passed NULL surface while executing the following code: public void takePictureNoPreview(Context context){ try { myCamera = Camera.open(0); } catch (Exception e) { e.printStackTrace(); console.append("Failed to connect to camera\n"); } if(myCamera!=null){ SurfaceView dummy=new SurfaceView(context); try { myCamera.setPreviewDisplay(dummy.getHolder()); myCamera.startPreview(); myCamera.takePicture(null, null, getJpegCallback()); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { myCamera

I'm going crazy with the use of SurfaceView. I've developed an app which takes pictures at fixed time intervals. It works well with my device with Androd 2.3. Here is a sample code: public class MainActivity extends Activity { private Camera mCamera; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button captureButton = (Button) findViewById(R.id.button_capture); captureButton.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { takeAPicture(); } } ); } private

Using below code to scroll I have a Surfaceview thread and an off canvas texture bitmap that is being generated (changed), first row (line), every frame and then copied one position (line) down on regular surfaceview bitmap to make a scrolling effect, and I then continue to draw other things on top of that. Well that is what I really want, however I can't get it to work even though I am creating a separate canvas for off screen bitmap. It is just not scrolling at all. I other words I have a memory bitmap, same size as Surfaceview canvas, which I need to scroll (shift) down one line every frame

I am new in android. I reviewed two examples Custom View with User Interaction and Android SurfaceView . I want that in second example draw cicle similarly with first example. How I can do this? Second question is: when the run() method has to stop? I found solution. For correctly work of SurfaceView I had to set background of canvas. When I done it everything is working fine. Create A bitmap then draw on its canvas and then add this bitmap to an imageview. Create A bitmap: Bitmap bmp = Bitmap.createBitmap(width, height, config); Draw on the bitmap canvas Canvas cv = new Canvas(bmp); cv