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    <p><strong>Using the Application Class</strong></p> <p>Depending on what you're doing in your initialization you could consider creating a new class that extends <code>Application</code> and moving your initialization code into an overridden <code>onCreate</code> method within that class.</p> <pre><code>public class MyApplicationClass extends Application { @Override public void onCreate() { super.onCreate(); // TODO Put your application initialization code here. } } </code></pre> <p>The <code>onCreate</code> in the application class is only called when the entire application is created, so the Activity restarts on orientation or keyboard visibility changes won't trigger it.</p> <p>It's good practice to expose the instance of this class as a singleton and exposing the application variables you're initializing using getters and setters.</p> <p><em>NOTE: You'll need to specify the name of your new Application class in the manifest for it to be registered and used:</em></p> <pre><code>&lt;application android:name="com.you.yourapp.MyApplicationClass" </code></pre> <p><strong>Reacting to Configuration Changes</strong> <em>[UPDATE: this is deprecated since API 13; <a href="http://www.androiddesignpatterns.com/2013/04/retaining-objects-across-config-changes.html" rel="noreferrer">see the recommended alternative</a>]</em></p> <p>As a further alternative, you can have your application listen for events that would cause a restart – like orientation and keyboard visibility changes – and handle them within your Activity.</p> <p>Start by adding the <code>android:configChanges</code> node to your Activity's manifest node</p> <pre><code>android:configChanges="keyboardHidden|orientation" </code></pre> <p>or for <a href="https://stackoverflow.com/a/9550231/2291">Android 3.2 (API level 13) and newer</a>:</p> <pre><code>android:configChanges="keyboardHidden|orientation|screenSize" </code></pre> <p>Then within the Activity override the <code>onConfigurationChanged</code> method and call <code>setContentView</code> to force the GUI layout to be re-done in the new orientation.</p> <pre><code>@Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); setContentView(R.layout.myLayout); } </code></pre>
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    1. COBetter add also android:screenOrientation="portrait" to activity properties in manifest and call super.onConfigurationChanged(newConfig) too - otherwise other (or future) configChanges won't work.
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    2. COI dont think the second approach works. I tried it; one Activity with a EditText. I wrote some text there, change orientation and the text was gone/reset.
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    3. COWhen I try it, I get an Exception saying "SuperNotCalledException". It requires that the overridden onConfigurationChanged call super.onConfigurationChanged, and that will make it do the onCreate... =(
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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