关于Leanback：
Declare Leanback support
Declare that your app uses the Leanback user interface required by Android TV. If you are developing an app that runs on mobile phones, wearables, tablets, etc.) as well as Android TV, set the required attribute value tofalse. If you set the required attribute value to true, your app will run only on devices that use the Leanback UI.
<manifest>
<uses-feature android:name=”android.software.leanback”
<android:required=”false” />
…
</manifest>