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copied!<p>The problem is that when the orientation is changed, the activity is restarted. There are multiple ways to fix that. </p> <p>One way is to make it so that the activity <em>won't</em> restart when the orientation is changed. Here's how to do that:</p> <p>Add <code>android:configChanges="orientation|screenSize"</code> to your <code><activity</code> tag, which is in your <code>AndroidManifest.xml</code>, like so:</p> <pre><code><activity android:name="UserIdActivity" android:label="@string/app_name" android:configChanges="orientation|screenSize" /> </code></pre> <p><a href="https://stackoverflow.com/questions/20306809/android-screen-orientation-change/20306937#20306937">Rastikan's answer</a> did it slightly differently, but his way of doing it won't work for any API after API 12 (<a href="https://stackoverflow.com/questions/5620033/onconfigurationchanged-not-getting-called">source</a> and <a href="http://developer.android.com/guide/topics/resources/runtime-changes.html" rel="nofollow noreferrer">this too</a>). My way above, you don't actually need to call <code>onConfiguationChanged</code> in your activity class.</p> <p>Another way of doing it would to use <code>onSaveInstanceState(Bundle savedInstanceState)</code> like <a href="https://stackoverflow.com/users/710183/rastikan">Rastikan</a> did.</p> <p>Another way of doing it would be to let the activity restart itself, but then using the <code>onResume()</code> method to change the background colour, if necessary, when the activity is restarted. Like this:</p> <pre><code>public boolean changeColor = false; // set changeColor to be true whenever you change the background colour public void onResume() { if (changeColor) { // change the background color } } </code></pre>

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