Shared element activity transition on android 5

Question

I wanted to setup a shared element transition when going from one Activity to another.

The first Activity has a RecyclerView with items. When an item is clicked that it

Answer 1

What I came up with is to avoid transitioning back to Activity with RecyclerView, or changing back transition with something else.

Disable all return transitions:

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public void finishAfterTransition() {
    finish();
}

Or, if you want to disable only shared elements return transition, and be able to set your own return transition:

// Track if finishAfterTransition() was called
private boolean mFinishingAfterTransition;

@Override
protected void onCreate(@Nullable final Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mFinishingAfterTransition = false;
}

public boolean isFinishingAfterTransition() {
    return mFinishingAfterTransition;
}

@Override
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public void finishAfterTransition() {
    mFinishingAfterTransition = true;
    super.finishAfterTransition();
}

public void clearSharedElementsOnReturn() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        TransitionUtilsLollipop.clearSharedElementsOnReturn(this);
    }
}

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private static final class TransitionUtilsLollipop {

    private TransitionUtilsLollipop() {
        throw new UnsupportedOperationException();
    }

    static void clearSharedElementsOnReturn(@NonNull final BaseActivity activity) {
        activity.setEnterSharedElementCallback(new SharedElementCallback() {

            @Override
            public void onMapSharedElements(final List names,
                    final Map sharedElements) {
                super.onMapSharedElements(names, sharedElements);
                if (activity.isFinishingAfterTransition()) {
                    names.clear();
                    sharedElements.clear();
                }
            }
        });
    }

With that implemented in base activity, you can easily use it in onCreate()

@Override
protected void onCreate(@Nullable final Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    clearSharedElementsOnReturn(this);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        // set your own transition
        getWindow().setReturnTransition(new VerticalGateTransition());
    }
}