java.lang.IllegalStateException: Only fullscreen opaque activities can request orientation

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In android Oreo (API 26) you can not change orientation for Activity that have below line(s) in style

 <item name="android:windowIsTranslucent">true</item>

or

 <item name="android:windowIsFloating">true</item>

You have several way to solving this :

1) You can simply remove above line(s) (or turn it to false) and your app works fine.

2) Or you can first remove below line from manifest for that activity

android:screenOrientation="portrait"

Then you must add this line to your activity (in onCreate())

‘>=’ change to ‘!=’ thanks to Entreco comment

    //android O fix bug orientation
    if (android.os.Build.VERSION.SDK_INT != Build.VERSION_CODES.O) {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    }

3) You can create new styles.xml in values-v26 folder and add this to your style.xml. (Thanks to AbdelHady comment)

 <item name="android:windowIsTranslucent">false</item>
 <item name="android:windowIsFloating">false</item>

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