Shared Element Transition not working on Android Nougat (API 25)

Question

Facing problems with Shared Element transition animation on Android 7 (Nougat)

In my case Activity A calls Activity B using shared element transition and pressing back on B finishes it and shows A. Now on A onStart is never called.

Working fine on previous versions of Android.

Strange behaviour. Need help

Answer 1

I solved the issue by defining the enter and exit transitions in code instead of defining it in themes.xml -> I removed the following lines of code from the themes.xml:

 <item name="android:windowEnterTransition" tools:targetApi="lollipop">
        @transition/fade
    </item>
    <item name="android:windowExitTransition" tools:targetApi="lollipop">
        @transition/fade_out
    </item>

    <item name="android:windowReturnTransition" tools:targetApi="lollipop">
        @transition/fade_out
    </item>

    <item name="android:windowSharedElementEnterTransition" tools:targetApi="lollipop">
        @transition/change_image_trans
    </item>
    <item name="android:windowSharedElementExitTransition" tools:targetApi="lollipop">
        @transition/change_image_trans_out
    </item>

    <item name="android:windowSharedElementReturnTransition" tools:targetApi="lollipop">
        @transition/change_image_trans_out
    </item>

And added the following lines to my activities (you have to add in onCreate before adding any content to the activity):

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        // inside your activity (if you did not enable transitions in your theme)
        getWindow().requestFeature(Window.FEATURE_ACTIVITY_TRANSITIONS);
        // set an enter transition

        getWindow().setEnterTransition(new Explode());
        // set an exit transition
        getWindow().setExitTransition(new Explode());
    }

With this code I just set the transitions for the activity - if you also want to change the content transitions you need to call getWindow().requestFeature(Window.FEATURE_CONTENT_TRANSITIONS);