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Android - Drawing on SurfaceView not appearing


Android - Drawing on SurfaceView not appearing

By : user2953033
Date : November 19 2020, 03:59 PM
With these it helps
You need to set zOrder in order to handle ordering of the view drawn on SurfaceView.
code :
transparentView.setZOrderOnTop(true);


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Drawing to a SurfaceView in Android

Drawing to a SurfaceView in Android


By : Hibbie
Date : March 29 2020, 07:55 AM
seems to work fine I removed the proxy class SurfaceRenderer and moved it all into my activity. It's working now. Here goes the fixed code:
code :
public class SvetlinSurfaceViewTestActivity
    extends Activity
    implements SurfaceHolder.Callback {

    private static final String TAG = "Svetlin SurfaceView";

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        SurfaceView view = new SurfaceView(this);
        setContentView(view);
        view.getHolder().addCallback(this);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        tryDrawing(holder);
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int frmt, int w, int h) { 
        tryDrawing(holder);
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {}

    private void tryDrawing(SurfaceHolder holder) {
        Log.i(TAG, "Trying to draw...");

        Canvas canvas = holder.lockCanvas();
        if (canvas == null) {
            Log.e(TAG, "Cannot draw onto the canvas as it's null");
        } else {
            drawMyStuff(canvas);
            holder.unlockCanvasAndPost(canvas);
        }
    }

    private void drawMyStuff(final Canvas canvas) {
        Random random = new Random();
        Log.i(TAG, "Drawing...");
        canvas.drawRGB(255, 128, 128);
    }
}
Android SurfaceView drawing

Android SurfaceView drawing


By : Pooja Karki
Date : March 29 2020, 07:55 AM
will help you I found solution. For correctly work of SurfaceView I had to set background of canvas. When I done it everything is working fine.
Android: Doing all my drawing on a SurfaceView; what's the proper way of making sure my drawing conforms to any screen s

Android: Doing all my drawing on a SurfaceView; what's the proper way of making sure my drawing conforms to any screen s


By : Mohit Rattu
Date : March 29 2020, 07:55 AM
seems to work fine There's a very simple yet effective way to do it, you can declare all your sizes in a dimen file for each specific density/size, as you usually do for layouts e.g:
What to use for drawing in Android - View or SurfaceView?

What to use for drawing in Android - View or SurfaceView?


By : chakradhar
Date : March 29 2020, 07:55 AM
With these it helps If you want to use Canvas, you are increasingly better off with a custom View, rather than a SurfaceView. The simple reason is that Canvas rendering on a View can be hardware accelerated, while Canvas rendering on a SurfaceView's surface is always done in software (still true as of Android 5.0).
By drawing "smooth" I assume you want some anti-aliasing effects. Check the chart on the hardware acceleration page to confirm that the effects you want are supported for the Android releases you want to ship on.
Android: Low FPS drawing many bitmaps in a surfaceview

Android: Low FPS drawing many bitmaps in a surfaceview


By : Mezito
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further You may be limited by pixel fill rate. How large (in pixels) is the display on your test device?
One simple thing to play with is to use setFixedSize() to reduce the size of the SurfaceView's Surface. That will reduce the number of pixels you're touching. Example here, video here, blog post here.
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