Background transparency in libgdx

Question

How can I make background of screen transparent if I use libgdx in Android?

The code I tried to use doesn't work.

Gdx.gl.glClearColor( 0, 0, 0, 0 );
Gdx.gl.glClear( GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT );

Answer 1

Just found a solution!

Just add this code to the class that extends AndroidApplication.

AndroidApplicationConfiguration cfg = new AndroidApplicationConfiguration();
cfg.r = cfg.g = cfg.b = cfg.a = 8;

cfg.useGL20 = false;
        
View view = initializeForView(new LineDrawing(), cfg);

if (graphics.getView() instanceof SurfaceView) {
            SurfaceView glView = (SurfaceView) graphics.getView();
            glView.getHolder().setFormat(PixelFormat.TRANSLUCENT);
            glView.setZOrderOnTop(true);
}

Don't forget to remove Gdx.gl.glClearColor from your render() method.

For fragment, use the same code inside your onCreateView method.