couldn't save which view has focus because the focused view
<activity
android:name="com.oatos.m.android.ui.UserInfoActivity"
android:configChanges="orientation|keyboardHidden|keyboard|screenLayout"
android:screenOrientation="portrait"
android:windowSoftInputMode="stateHidden" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
android:launchMode="singleInstance"不能这样
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