I change theme like below
<style name="Theme.Transparent" parent="Theme.AppCompat.Light.NoActionBar"> <item name="android:windowNoTitle">true</item> <item name="android:windowActionBar">false</item> <item name="android:windowFullscreen">true</item> <item name="android:windowContentOverlay">@null</item> <item name="android:windowIsTranslucent">true</item> </style>
In AndroidManifest.xml
<activity android:name=".MainActivity" android:exported="true" android:label="@string/app_name" android:theme="@style/Theme.Transparent"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity>
And the result:

I also commit new source code to HERE if anyone needed