Changing background image when tapped -- Android

I am trying to write a basic app that when the phone is tapped anywhere开发者_JS百科, the background image changes. If anyone could link me to a good tutorial on how to do this or have some code snippits i could use it would be greatly appreciated.

Also is this possilble to code this in the xml or does it need to be done in java?

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Add an onClick event to the layout and in the listener, change the background.

in xml

<LinearyLayout android:layout_height="FILL_PARENT"
    android:layout_width="FILL_PARENT" 
    android:onClick="onClick" />

and in your activity

public void onClick(View v) {
    v.setBackgroundResource(R.drawable.someDrawable);
}