Android get dead area size around camera view

Question

I am using FrameLayout or PreviewView to display the camera feed. The view is match_parent for the width and height (as I am unable to wrap_content for the height) and the scaleType is fitCenter to get the correct aspect ratio. Doing that as expected results in black area above and below the camera feed. How can I know the top and bottom dead area heights so that I can position other UI elements exactly in that area?

Thanks!!

Answer 1

So to answer my own. Since I was trying to achieve a fitCenter scale for the camera preview which for mobile phones is 4:3 what I was able to do is within a ConstraintLayout add a frame layout with a dimension ration of 4:3. That way the camera preview was contained exactly in that layout without any dead areas, and I was to position other UI elements above and below by constraining them to the top and bottom of the frame layout.

    <FrameLayout
        android:id="@+id/cameraView"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintDimensionRatio="W,4:3"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:clipChildren="false" />