Android: Exception: Only fullscreen opaque activities can request orientation

java.lang.illegalstateException: only fullscreen activities can request orientation adactivity — java.lang.IllegalStateException: Only fullscreen opaque activities can request orientation

I am facing the problem while retrieving the contacts from the contact book in Android 8.0 Oreo java.lang.IllegalStateException: Only fullscreen opaque activities can request orientation

I am trying to get the contact in my activity from the phone contact book and it works perfect for Lollipop, Marshmallow, Nougat, etc but it will gives me the error for Oreo like this please help me. My code is here below.

E/AndroidRuntime: FATAL EXCEPTION: main Process: com.tryandroid8, PID: 6573

Google throws this exception on Activity’s onCreate method after v27, their meaning is : if an Activity is translucent or floating, its orientation should be relied on parent(background) Activity, can't make decision on itself.

Even if you remove android:screenOrientation="portrait" from the floating or translucent Activity but fix orientation on its parent(background) Activity, it is still fixed by the parent, I have tested already.

One special situation : if you make translucent on a launcher Activity, it has’t parent(background), so always rotate with device. Want to fix it, you have to take another way to replace <item name="android:windowIsTranslucent">true</item> style.