Adding custom radio buttons in android

Add a background drawable that references to an image, or a selector (like below), and make the button transparent:

<RadioButton
    android:id="@+id/radio0"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@null"
    android:button="@drawable/yourbuttonbackground"
    android:checked="true"
    android:text="RadioButton1" />

If you would like your radio buttons to have a different resource when checked, create a selector background drawable:

res/drawable/yourbuttonbackground.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
        android:drawable="@drawable/b"
        android:state_checked="true"
        android:state_pressed="true" />
    <item
        android:drawable="@drawable/a"
        android:state_pressed="true" />
    <item
        android:drawable="@drawable/a"
        android:state_checked="true" />
    <item
        android:drawable="@drawable/b" />
</selector>

In the selector above, we reference two drawables, a and b, here’s how we create them:

res/drawable/a.xml – Selected State

<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <corners
        android:radius="5dp" />
    <solid
        android:color="#fff" />
    <stroke
        android:width="2dp"
        android:color="#53aade" />
</shape>

res/drawable/b.xml – Regular State

<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <corners
        android:radius="5dp" />
    <solid
        android:color="#fff" />
    <stroke
        android:width="2dp"
        android:color="#555555" />
</shape>

More on drawables here: http://developer.android.com/guide/topics/resources/drawable-resource.html