Button always displays on top in FrameLayout

Question

I have FrameLayout like this:

<FrameLayout     xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent">      <Button         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:onClick="changeColor"         android:text="new button"/>      <TextView         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="some text"/>  </FrameLayout> 

The problem is that the button is displayed on top while FrameLayout class overview tells us this: "Child views are drawn in a stack, with the most recently added child on top".

Answer 1

This answer

Buttons in Lollipop and higher have a default elevation to them which causes them to always draw on top. You can change this by overriding the default StateListAnimator.

Try putting this into your button XML:

android:stateListAnimator="@null"

The FrameLayout should now cover the button.

Answer 2

In the Android 5.0 (API 21) and above, you must add android:elevation into the view.

<FrameLayout     xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent">      <Button         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:onClick="changeColor"         android:text="new button"/>      <TextView         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="some text"         android:elevation="3dp"/>