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POradiogroup behavior on orientation change
 

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    <p>I am hoping that someone can help me understand what's going on with respect to an Android radiogroup and the onCheckedChanged callbacks when the orientation changes.</p> <p>I have a radio group with three radio buttons. The second button is defined as the default by setting the checked attribute to true. My xml for the radio group is as follows:</p> <pre><code> &lt;RadioGroup android:id="@+id/rgReportRange" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:orientation="horizontal" &gt; &lt;RadioButton android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/One" /&gt; &lt;RadioButton android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:checked="true" android:text="@string/Two" /&gt; &lt;RadioButton android:id="@+id/button3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/Three" /&gt; &lt;/RadioGroup&gt; </code></pre> <p>The RadioGroup has an onCheckedChangedListener. When the orientation changes, the onCheckedChangedListener is being called back differently based on which button is selected before the orientation change.</p> <p>If button1 is selected, I see one callback to the onCheckedChanged method with checkedID equal to button1.</p> <p>If button2 is selected, I see no callback to the onCheckedChanged method.</p> <p>If button3 is selected, I see two callbacks to the onCheckedChanged method. The first callback has checkedID equal to button2. The second callback has checkedID equal to button3.</p> <p>I don't understand the difference in behavior between the first and third cases. In both, there is a radio button other than the default selected.</p>
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