没有setZOrderOnTop（true）是否可以使SurfaceView透明？

Question

I need to make my libGDX GlSufraceView transparent with opportunity to add some android view above. Earlier I used code below:

if (graphics.getView() instanceof SurfaceView) {
    GLSurfaceView glView = (GLSurfaceView) graphics.getView();
    glView.setZOrderOnTop(true);
    glView.getHolder().setFormat(PixelFormat.RGBA_8888);
}

However, this code does not give me possibility to add android views above. After a short research I found replacement: glView.setZOrderMediaOverlay(true); . With that line of code, I can show any view above surface, but transparent became black.

I thought that this problem was due to the fact that my code was launched after setRenderer(...). After I found method which contains setRenderer(...) in gdx-backend-android. Few moments later I downloaded libGDX sources and add lines before setRenderer(...), but unfortunately it didn't help, situation still the same.

The code, which I was trying:

1)

GLSurfaceView20 view = new GLSurfaceView20(application.getContext(), resolutionStrategy, config.useGL30 ? 3 : 2);
view.setZOrderOnTop(true);

if (configChooser != null)
    view.setEGLConfigChooser(configChooser);
else
    view.setEGLConfigChooser(config.r, config.g, config.b, config.a, config.depth, config.stencil);

view.getHolder().setFormat(PixelFormat.RGBA_8888);

view.setRenderer(this);
view.setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);

return view;

2)

GLSurfaceView20 view = new GLSurfaceView20(application.getContext(), resolutionStrategy, config.useGL30 ? 3 : 2);
if (configChooser != null)
    view.setEGLConfigChooser(configChooser);
else
    view.setEGLConfigChooser(config.r, config.g, config.b, config.a, config.depth, config.stencil);

view.setZOrderOnTop(true);
view.getHolder().setFormat(PixelFormat.RGBA_8888);

view.setRenderer(this);
return view;

3)

GLSurfaceView20 view = new GLSurfaceView20(application.getContext(), resolutionStrategy, config.useGL30 ? 3 : 2);

if (configChooser != null)
    view.setEGLConfigChooser(configChooser);
else
    view.setEGLConfigChooser(config.r, config.g, config.b, config.a, config.depth, config.stencil);

view.getHolder().setFormat(PixelFormat.RGBA_8888);
view.setZOrderMediaOverlay(true);
view.setEGLContextClientVersion(2);

view.setRenderer(this);
return view;

Also I found few topics about that theme, but there is no right answer. Is is possible to do that?

Answer 1

Looks like it's impossible, but fortunately, I found the solution. I just replaced surface view in libgdx android backend sources with texture view. Also I added one line in my code, for make my texture view transparent:

view.setOpaque(false);

Advantages of my solution:

• Increased FPS (130 instead of 55)
• Flexibility

Now, I can use my libGDX fragment view as any ordinary views. I can place it between android views and so on.