RevealBaseActivity.java

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Point;
import android.os.Bundle;
import android.view.View;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.databinding.ViewDataBinding;

public abstract class RevealBaseActivity<T extends ViewDataBinding, V extends BaseViewModel> extends BaseActivity<T, V> {
    public static final String EXTRA_REVEAL_CENTER = "EXTRA_REVEAL_CENTER";
    private static final int revealDuration = 350;
    private static final int hideDuration = 250;

    private Point revealCenter;

    public static void startRevealWithOrigin(@NonNull Context context, @Nullable Bundle extras, @NonNull Class<? extends RevealBaseActivity> activityClass, @NonNull Point revealCenter) {
        startBaseActivity(context, getExtras(extras, revealCenter), activityClass);
    }

    public static void startRevealWithOriginForResult(@NonNull Activity activity, @Nullable Bundle extras, @NonNull Class<? extends RevealBaseActivity> activityClass, int requestCode, @NonNull Point revealCenter) {
        startBaseActivityForResult(activity, getExtras(extras, revealCenter), activityClass, requestCode);
    }

    @NonNull
    private static Bundle getExtras(@Nullable Bundle extras, @NonNull Point revealCenter) {
        Bundle originExtras = new Bundle();
        originExtras.putParcelable(EXTRA_REVEAL_CENTER, revealCenter);

        if (extras != null) {
            originExtras.putAll(extras);
        }
        return originExtras;
    }

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        overridePendingTransition(0, 0);
        super.onCreate(savedInstanceState);
        getView().getRoot().setVisibility(View.INVISIBLE);
    }

    @Override
    protected void startEnterAnimations() {
        Intent intent = getIntent();
        if (intent.hasExtra(EXTRA_REVEAL_CENTER)) {
            revealCenter = intent.getParcelableExtra(EXTRA_REVEAL_CENTER);
            SimpleAnimationUtils.revealOrFadeIn(getView().getRoot(), revealDuration, revealCenter).start();
            return;
        }

        SimpleAnimationUtils.revealOrFadeIn(getView().getRoot(), revealDuration).start();
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (isFinishing()) {
            overridePendingTransition(0, 0);
        }
    }

    @Override
    public void finish() {
        SimpleAnimationListener listener = new SimpleAnimationListener() {
            @Override
            public boolean onAnimationEnd(@NonNull View view) {
                RevealBaseActivity.super.finish();
                return false;
            }
        };

        if (revealCenter != null) {
            SimpleAnimationUtils.hideOrFadeOut(getView().getRoot(), hideDuration, listener, revealCenter).start();
            return;
        }

        SimpleAnimationUtils.hideOrFadeOut(getView().getRoot(), hideDuration, listener).start();
    }

    public void finishWithoutUnreveal() {
        super.finish();
    }
}

SimpleAnimationUtils.java

https://gist.github.com/Ferfalk/1c9687be9f4fba3cf6ecc79b1871fdf5