問題：
Android: couldn't save which view has focus because the focused view ### has no id
可能引起原因有兩種，對應解決方法如下：
解決方案一：
<application
android:icon="@drawable/icon" android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:configChanges="orientation|keyboardHidden|keyboard|screenLayout"
android:name=".Main" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
解決方案二：
What probably happened is that you created a thread in the surfaceCreated() method but didn’t stop it or get rid of it in the surfaceDestroy() method.
When you didn’t give a theme for the preferences, it took over the whole screen and your old surface was destroyed. But when you specified a dialog-like theme, the old surface was still there because it was visible underneath the preferences.
public void surfaceCreated(SurfaceHolder holder)
{
if (_thread == null || _thread.getState() == Thread.State.TERMINATED)
{
_thread = new TutorialThread(getHolder(), this);
_thread.setRunning(true);
_thread.start();
}
else
{
_thread.setRunning(true);
_thread.start();
}
}
This solved the problem for me, a thread’s start method cannot be called twice, so I had to reallocate…
http://forums.pragprog.com/forums/138/topics/4085