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copied!<p>Following the comments above:</p> <p>Well, the only thing I can think of (if I understand this correctly, you want to change the background of an application, via another application - right?) is to set the background to Theme.Wallpaper. Then in that other application, you can set the background differently and in the base application, the BG will be changed accordingly.</p> <p>Asuming - pick the file explorer, navigate to the .jpg, .png etc. file and you set it to be your device's background. If your application uses <code>Theme.Wallpaper</code> as the default application Theme, then it will be changed, according to the background image you've set to the device.</p> <p>In simpler terms: 1. Problem - You want to change the background of your application (YApp for short), but you want to achieve this by choosing a picture from another application (let's say a Gallery). 2. Solution - the only thing I can think of is to set this desired image as a background to the device itself. Then in YApp you'll have <code>Theme.Wallpaper</code> set, which will use the device's background</p> <p>To put this with code, here's a sample extraction from the <code>AndroidManifest</code>:</p> <p><code><activity android:name="MainActivity" android:theme="@style/Theme.Translucent"> </activity></code></p> <p>This could be applied to any activity. <a href="http://developer.android.com/guide/topics/ui/themes.html" rel="nofollow">Here's</a> the link for reference.</p> <p>Cheers</p>

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