官方支持的双向绑定：
- AbsListView android:selectedItemPosition
- CalendarView android:date
- CompoundButton android:checked
- DatePicker android:year, android:month, android:day
- NumberPicker android:value
- RadioGroup android:checkedButton
- RatingBar android:rating
- SeekBar android:progress
- TabHost android:currentTab
- TextView android:text
- TimePicker android:hour, android:minute
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