LauncherActivity2.java

@Override
    public void onAnimationStart(Animation animation) {
        
    }

    @Override
    public void onAnimationEnd(Animation animation) {
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                if(FirebaseUtils.isAuth()){
                    startChatActivity();
                }else {
                    AuthFragment authFragment = new AuthFragment();

                    if(Build.VERSION.SDK_INT>= Build.VERSION_CODES.LOLLIPOP){
                        /**
                         activity or fragment entry transition and shared elements
                         is available only on API 21 and higher
                         **/

                        Slide slide = new Slide(Gravity.BOTTOM);
                        slide.setDuration(350);
                        slide.setInterpolator(AnimationUtils.loadInterpolator(
                                getBaseContext(),
                                android.R.interpolator.linear_out_slow_in
                        ));
                        authFragment.setEnterTransition(slide);

                        /**
                         * inflating the shared element transition from the resource folder
                         * **/
                        authFragment.setSharedElementEnterTransition(TransitionInflater.from(getBaseContext()).inflateTransition(R.transition.move));
                    }
                    /**
                     * starting the auth fragment calling the support fragment Manger,
                     *  with specifying the views that we want to be shared
                     *  **/
                    getSupportFragmentManager()
                            .beginTransaction()
                            .replace(R.id.fragment_container,authFragment)
                            .addSharedElement(findViewById(R.id.chat_me_logo),getResources().getString(R.string.app_name))
                            .commit();
                }

            }
        },
                750);

    }

    @Override
    public void onAnimationRepeat(Animation animation) {

    }
    /**
     * a method used to start the chat activity
     */
    private void startChatActivity(){
        Intent intent =new Intent(LauncherActivity.this,ChatActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(intent);
        finish();
    }