Set Wallpaper on application background

Question

I am making an application, in which i want to set wallpaper on application background, not on the homescreen background. Can anyone there guide me how to do this?

Answer 1

Note that BackGround or the Image view should always on top of other view

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<ImageView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:scaleType="centerCrop"
    android:src="@drawable/bu"/>

<TextView android:text="@string/hello_world"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:padding="40dp"
    android:textSize="45sp"/>
<TextView android:text="Good_Day"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:padding="40dp"
    android:textSize="45sp"/>

</RelativeLayout>