Add this to the manifest

activity.xml

<!-- Add this to the activity tag -->
<activity
  android:name=".ui.main.MainActivity"
  android:banner="@drawable/banner"
  android:icon="@drawable/banner"
  android:label="@string/app_name"
  android:logo="@drawable/banner"
  android:screenOrientation="landscape">

AndroidManifest.xml

<!-- Add this INSIDE the application tag -->
<intent-filter>
    <action android:name="android.intent.action.MAIN"/>
    <category android:name="android.intent.category.LEANBACK_LAUNCHER"/>
</intent-filter>

Outside.xml

<!-- Add this inside the manifest tag and outside the application tag -->
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

<uses-feature
    android:name="android.hardware.touchscreen"
    android:required="false"/>
<uses-feature
    android:name="android.software.leanback"
    android:required="true"/>