Android：如何在布局已经包含按钮的情况下以编程方式通过视图覆盖整个布局？

Question

I've a linear layout filled by buttons(view1 - view5).

I would like to add a view(red star) to this layout and I want this red star to cover the whole layout and its buttons (without setting the visibility of them)

in the attached image:

1 - the layout I've, filled by buttons

2- the layout I want to achieve by adding my red star programmatically

How can I do so?

Answer 1

First switch the root layout to a RelativeLayout, something like

<RelativeLayout ...>
    <View android:id="@+id/view1"
          ... />
    <View android:id="@+id/view2"
          ... 
          android:layout_below="@id/view1" />
    <View android:id="@+id/view3"
          ...
          android:layout_toRightOf="@id/view2"
          android:layout_below="@id/view1" />
    ...

Then at the bottom of that layout add your overlay which ignores all the other views (so can draw over them)

    <View android:id="@+id/overlay"
          android:layout_alignParentLeft="true"
          android:layout_alignParentTop="true" />
</RelativeLayout>