Create custom background for Views

This exercise demonstrate how to create custom background, which can be applied on various views such as TextView, Button, ImageButton...etc.

Create /res/drawable/mybackground.xml to define our custom background.

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_pressed="true" >
        <shape>
            <gradient
                android:startColor="#FF0000"
                android:endColor="#FF00FF"
                android:angle="180" />
            <stroke
                android:width="3dp"
                android:color="@android:color/background_dark" />
            <corners
                android:radius="3dp" />
            <padding
                android:left="50dp"
                android:top="10dp"
                android:right="50dp"
                android:bottom="10dp" />
        </shape>
    </item>

    <item android:state_focused="true" >
        <shape>
            <gradient
                android:startColor="@android:color/background_light"
                android:endColor="@android:color/background_dark"
                android:angle="180" />
            <stroke
                android:width="3dp"
                android:color="@android:color/background_dark" />
            <corners
                android:radius="3dp" />
            <padding
                android:left="50dp"
                android:top="10dp"
                android:right="50dp"
                android:bottom="10dp" />
        </shape>
    </item>

    <item>        
        <shape>
            <gradient
                android:startColor="@android:color/background_light"
                android:endColor="@android:color/background_dark"
                android:angle="180" />
            <stroke
                android:width="3dp"
                android:color="@android:color/background_dark" />
            <corners
                android:radius="3dp" />
            <padding
                android:left="50dp"
                android:top="10dp"
                android:right="50dp"
                android:bottom="10dp" />
        </shape>
    </item>
</selector>

Use the custom background in layout file.

<LinearLayout 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" 
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello, it's a TextView"
        android:clickable="true"
        android:background="@drawable/mybackground"
        android:layout_margin="5dp" />
    
 <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello, it's a Button"
        android:background="@drawable/mybackground"
        android:layout_margin="5dp" />
        
    <ImageButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher"
        android:background="@drawable/mybackground"
        android:layout_margin="5dp" />

</LinearLayout>

Download the files.

Related:
- Create custom Button using StateListDrawable