How to change background color in android app

You can also use

android:background="#ffffff"

in your xml layout or /res/layout/activity_main.xml, or you can change the theme in your AndroidManifest.xml by adding

android:theme="@android:style/Theme.Light"

to your activity tag.

If you want to change the background dynamically, use

YourView.setBackgroundColor(Color.argb(255, 255, 255, 255));

You need to use the android:background property , eg

android:background="@color/white"

Also you need to add a value for white in the strings.xml

<color name="white">#FFFFFF</color>

Edit : 18th Nov 2012

The first two letters of an 8 letter color code provide the alpha value, if you are using the html 6 letter color notation the color is opaque.

Eg :

enter image description here

Simplest way

android:background="@android:color/white"

No need to define anything. It uses predefined colors in android.R.