如何将重叠的 SurfaceView 放在前面？

Question

I am doing a Matlab-style heat map plot in Android and decided to use an overlapping combination of a GLSurfaceView to do the heat map (if you don't know what a heat map is, don't worry about it) and a SurfaceView to do the axes labelling, bitmaps on top of the heat map, etc. That way the GLSurfaceView can just do the things that it is good at and the canvas-based SurfaceView can just do the things that it is good at. The SurfaceView has a transparent background so that the GLSurfaceView can be seen through it.

My problem is that the GLSurfaceView appears to come to the "top" when it is rendered, and I am not able to force the SurfaceView to go to the top using the "bringToFront()" method. Is there a way to do this? I have turned continuous rendering off, so I manually render the SurfaceView ("auxiliary") when I render the GLSurfaceView.

public void onDrawFrame(GL10 gl) {
    Log.d(TAG, "HeatMapView onDrawFrame");

    gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
    gl.glMatrixMode(GL10.GL_MODELVIEW);
    gl.glLoadIdentity();

    heatMap.draw(gl);
    auxiliary.draw(); // This is the SurfaceView draw
}  


/**
 * This function draws our heat map on screen.
 * @param gl
 */
public synchronized void draw(GL10 gl) {
    Log.d(TAG, "HeatMap draw");
    if (!openGlSetUp) {
        gl.glFrontFace(GL10.GL_CW);
        gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer);
        gl.glColorPointer(4, GL10.GL_FLOAT, 0, colorBuffer);
        openGlSetUp = true;
    }

    gl.glDrawElements(GL10.GL_TRIANGLES, curIndexBufferLen, GL10.GL_UNSIGNED_SHORT, indexBuffer);
    dataDirty = false;
}

/**
 * This function draws the axes and bitmaps.
 */
public void draw() {
    Log.d(TAG, "draw");
    Canvas canvas = holder.lockCanvas(null);

    canvas.drawColor( 0, PorterDuff.Mode.CLEAR ); 
    Paint paint = new Paint();
    paint.setAntiAlias(true);
    paint.setStyle(Paint.Style.FILL);
    paint.setTextSize(16);
    paint.setColor(Color.argb(255,255,255,255));
    canvas.rotate(90f, 300, 300);
    canvas.drawText("Azimuth", 250, 590, paint);
    canvas.rotate(-90f, 300, 300);
    canvas.drawText("Freq (GHz)", 525, 555, paint);

    holder.unlockCanvasAndPost(canvas);
    bringToFront();
}

protected void onVisibilityChanged (View changedView, int visibility) {
    bringToFront();
}

Obviously this isn't all the code- I tried to show the most relevant parts. Any ideas on how I can get the SurfaceView (auxiliary) on top?

Answer 1

The answer given in this thread .