How to create a BottomBar as StickyBottomCaptureLayout in camera2 Android api?

Question

Context:

In the android-7.1.1_r12 api, the android.hardware.camera2 uses a StickyBottomCaptureLayout as a \"BottomBar\" to display the ac

Answer 1

I just found the solution: I need to set a RectF for each layout and set them with the right coordinates. From the source class, I manage to do this:

@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
    // rotation from context Surface.ROTATION
    int degrees = getDeviceRotation(getContext());
    // size of the sticky bottom bar
    int offsetSize = (int) getResources().getDimension(R.dimen.sticky_bar_default_size);

    // layout sticky bottom bar
    RectF bottomBarRect = getStickyBarRect(degrees, offsetSize);
    mBottomBar.layout((int) bottomBarRect.left, (int) bottomBarRect.top,
            (int) bottomBarRect.right, (int) bottomBarRect.bottom);

    // layout upper view
    RectF upperViewRect = getUpperViewRect(degrees, offsetSize);
    mUpperView.layout(...); // same logic as above

    invalidate();
}

// Gets the coordinates positions to set the Sticky Bottom Bar
private RectF getStickyBarRect(int degrees, int offsetSize) {
    float left = 0, top = 0, right = 0, bottom = 0;
    int width = getWidth();
    int height = getHeight();

    if (degrees == 0) { // stickybar at bottom
        top = height - offsetSize;
        right = width;
        bottom = height;
    } else if (degrees == 90) { // stickybar at right
        left = width - offsetSize;
        right = width;
        bottom = height;
    } else if (degrees == 180) { // stickybar at top
        right = width;
        bottom = height - offsetSize;
    } else if (degrees == 270) { // stickybar at left
        right = offsetSize;
        bottom = height;
    }

    return new RectF(left, top, right, bottom);
}

// Gets the coordinates positions to set the upper views
private RectF getUpperViewRect(int degrees, int offsetSize) {
    // same logic as getStickyBarRect()
}

And this works as expected!

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I found a way to reproduce the smooth orientation like the native camera2 app with this answer. Using an orientation listener and the configChanges options, I'm able to reorganize the views without the default rotation animation. I set the proper positions in onLayout() and call invalidate(). ;)