Change activity background from code

Question

I have an activity with a background:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:minWidth="25px"
android:minHeight="25px"
android:background="@drawable/background_fingerboard" />

How can I change background image from code? I actually use mono, but Java samples will also be helpful.

Answer 1

first add LinearLayout id as in your layout xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/linearLayoutid" 
android:minWidth="25px"
android:minHeight="25px"
android:background="@drawable/background_fingerboard" 

and in code part set background as::

LinearLayout  linearLayout = (LinearLayout) findViewById(R.id.linearLayoutid);
 linearLayout.setBackgroundResource(R.drawable.background_fingerboard);