更改驻留在另一个活动中的切换按钮的状态

Question

我正在尝试从活动类1中的活动类2中激活一个切换按钮。类1中将有一个切换按钮，用于激活位于类2中的另一个切换按钮。我已经了解了共享的首选项，意图和其他内容，但是没有看到任何对我有帮助的代码，或者我只是听不懂。希望有人能指出正确的方向。预先感谢您的帮助。

//活动类2中的切换按钮

@Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity2);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);


    location_switch = (MaterialAnimatedSwitch) findViewById(R.id.location_switch);
    location_switch.setOnCheckedChangeListener(new MaterialAnimatedSwitch.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(boolean isOnline) {
            if (isOnline) {
                FirebaseDatabase.getInstance().goOnline(); // set connected when switch to on

                if (ActivityCompat.checkSelfPermission(User.this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
                        ActivityCompat.checkSelfPermission(User.this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                    return;
                }
                buildLocationCallBack();
                buildLocationRequest();
                fusedLocationProviderClient.requestLocationUpdates(mLocationRequest, locationCallback, Looper.myLooper());

                //Geo Fire
                users = FirebaseDatabase.getInstance().getReference(Common.user_tble).child(Common.currentUser.getType());
                geoFire = new GeoFire(users);
                displayLocation();
                Snackbar.make(mapFragment.getView(), "You are online", Snackbar.LENGTH_SHORT)
                        .show();
            } else {
                FirebaseDatabase.getInstance().goOffline(); //Set disconnect when switch to off

                fusedLocationProviderClient.removeLocationUpdates(locationCallback);

                mCurrent.remove();
                mMap.clear();
                if (handler != null)
                    handler.removeCallbacks(drawPathRunnable);
                Snackbar.make(mapFragment.getView(), "You are offline", Snackbar.LENGTH_SHORT)
                        .show();
            }

        }
    });
}

///我可以在活动类1中添加什么以更改活动类2中此切换按钮的状态