Calling startActivity with shared element transition from onActivityResult

Question

I'm calling within onActivityResult

startActivity(intent, ActivityOptions.makeSceneTransitionAnimation(this, imgv, imgv.transitionName).toBundle())

What I expect to happen
activityB to be started and displayed with a shared element transition

What actually happens
activityB is not started/displayed until minimizing the app and reopening it from recents (animation is also not displayed at this point). Without adding the scene transition it works per-usual and calling this from anywhere else in the code works as expected.

I've tried

• runOnUiThread .
• postponeEnterTransition() with startPostponedEnterTransition() in second activity.
• finishAfterTransition() this results in a flicker and then showing activityB, I don't want to finish activityA but just tried this.
• Using onActivityReenter() instead, I can't do this as it does not seem to be called when I startActivityForResult() in order to use google sign in.

I suspect it has something todo with a race condition with the animation framework

Answer 1

onActivityResult() is called between onStart() and onResume() for modern versions of the Android API. It sounds like there's a problem starting a new Activity with a shared element transition before your activity has resumed.

(I'm not sure why this problem exists. Perhaps another user can answer that.)

To work around this issue, I recommend saving information in onActivityResult() and then querying it in onResume():

private boolean launchNextActivity = false;

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (...) {
        this.launchNextActivity = true;
    }
}

@Override
protected void onResume() {
    super.onResume();

    if (launchNextActivity) {
        launchNextActivity = false;
        // do the launch
    }
}