DO NOT MERGE Handle back button for notification panel

import android.os.RemoteException;

import android.util.Log;

import android.view.GestureDetector;

import android.view.KeyEvent;

import android.view.LayoutInflater;

import android.view.MotionEvent;

import android.view.View;

        mNotificationView = (CarNotificationView) LayoutInflater.from(mContext).inflate(

                R.layout.notification_center_activity, container,

                /* attachToRoot= */ false);

        mNotificationView.setKeyEventHandler(

                event -> {

                    if (event.getKeyCode() != KeyEvent.KEYCODE_BACK) {

                        return false;

                    }

                    if (event.getAction() == KeyEvent.ACTION_UP && isPanelExpanded()) {

                        toggle();

                    }

                    return true;

                });

        container.addView(mNotificationView);

        onNotificationViewInflated();