Question

There is a background in my app, and it should be changed after some event. So, how should i do that?

main.xml:

    <AbsoluteLayout
android:id="@+id/widget0"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:background="@drawable/bg">

and there background should be changed:

if(a<b) *change background to bg2.jpg goes here*

help please and sorry for my english

Answer 1

I see that you use Absolute Layout. So just instantiate new AbsoluteLayout object.

AbsoluteLayout al = (AbsoluteLayout) findViewById(R.id.widget0);
//This function will change background drawable, so place it where you want.
al.setBackgroundDrawable(yourDrawableID);

By the way, you can also do

al.setBackgroundResource(resourceID);

with resourceID should navigate to a drawable ID and set to 0 if you want to remove the background.