重新启动应用程序时保存布尔状态

我有 6 个布尔变量，它们已初始化为 false。有 6 个不同的图像视图与这 6 个布尔假变量相关联。当用户单击这些图像中的任何一个时，相应的布尔变量将切换为 true，当用户再次单击同一图像时，它将像打开和关闭一样变为 false。对选择的选项感到满意后，用户可以单击完成按钮，数据将根据哪些选项是 true 哪些是false.

我的问题是，每当应用程序重新启动时，所有布尔变量都会再次初始化为 false，我理解这样一个事实，即应用程序为 OnCreate 类重新启动，因为变量再次为 false。即使在应用程序重新启动后，如何编写可以保存这些变量状态的特定代码？

下面是我的代码：

    boolean checkcar = false, checkPickUp = false, checkTruck = false, checkCycle = false, checkBike = false, checkMen = false;
  private FirebaseAuth firebaseAuth;
private String currentUserID;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    myTransport = inflater.inflate(R.layout.fragment_transport, container, false);
    firebaseAuth = FirebaseAuth.getInstance();

    currentUserID = firebaseAuth.getCurrentUser().getUid();
    carImage = myTransport.findViewById(R.id.carTransport);
    pickUpImage = myTransport.findViewById(R.id.pickUpTransport);
    truckImage = myTransport.findViewById(R.id.truckTransport);
    cycleImage = myTransport.findViewById(R.id.cyclerTransport);
    bikeImage = myTransport.findViewById(R.id.bikeTransport);
    menImage = myTransport.findViewById(R.id.menTransport);
    done = myTransport.findViewById(R.id.selectUserTransportBtn);
    transport = FirebaseDatabase.getInstance().getReference().child("UserProfileDetails").child(currentUserID).child("Transport");



    MarkUserRegisteredTransport();


    carImage.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

    if (!checkcar) {
        carImage.setColorFilter(carImage.getContext().getResources().getColor(R.color.TransportAfterClicked), PorterDuff.Mode.SRC_ATOP);
        checkcar = true;
    } else {
        carImage.setColorFilter(carImage.getContext().getResources().getColor(R.color.colorAccent), PorterDuff.Mode.SRC_ATOP);
        checkcar = false;
    }
        }
    });


    pickUpImage.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
             if (!checkPickUp) {
        pickUpImage.setColorFilter(pickUpImage.getContext().getResources().getColor(R.color.TransportAfterClicked), PorterDuff.Mode.SRC_ATOP);
        checkPickUp = true;
    } else {
        pickUpImage.setColorFilter(pickUpImage.getContext().getResources().getColor(R.color.colorAccent), PorterDuff.Mode.SRC_ATOP);
        checkPickUp = false;
    }
        }
    });

    truckImage.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
             if (!checkTruck) {
        truckImage.setColorFilter(truckImage.getContext().getResources().getColor(R.color.TransportAfterClicked), PorterDuff.Mode.SRC_ATOP);
        checkTruck = true;
    } else {
        truckImage.setColorFilter(truckImage.getContext().getResources().getColor(R.color.colorAccent), PorterDuff.Mode.SRC_ATOP);
        checkTruck = false;
    }
        }
    });

    cycleImage.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (!checkCycle) {
        cycleImage.setColorFilter(cycleImage.getContext().getResources().getColor(R.color.TransportAfterClicked), PorterDuff.Mode.SRC_ATOP);
        checkCycle = true;
    } else {
        cycleImage.setColorFilter(cycleImage.getContext().getResources().getColor(R.color.colorAccent), PorterDuff.Mode.SRC_ATOP);
        checkCycle = false;
    }
        }
    });

    bikeImage.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {


    menImage.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (!checkMen) {
        menImage.setColorFilter(menImage.getContext().getResources().getColor(R.color.TransportAfterClicked), PorterDuff.Mode.SRC_ATOP);
        checkMen = true;
    } else {
        menImage.setColorFilter(menImage.getContext().getResources().getColor(R.color.colorAccent), PorterDuff.Mode.SRC_ATOP);
        checkMen = false;
    }

        }
    });

这是当用户可以点击完成并且信息在 firebase 中更新为 true 或 false 时使用他们的资源

    done.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
                   HashMap userTransport = new HashMap();
    userTransport.put("check Car", checkcar);
    userTransport.put("check PickUp", checkPickUp);
    userTransport.put("check Truck", checkTruck);
    userTransport.put("check Cycle", checkCycle);
    userTransport.put("check bike", checkBike);
    userTransport.put("check Men", checkMen);

    transport.updateChildren(userTransport).addOnCompleteListener(new OnCompleteListener() {
        @Override
        public void onComplete(@NonNull Task task) {
            if (task.isSuccessful()) {
                Toast.makeText(getContext(), "Transportation information updated", Toast.LENGTH_LONG).show();

            } else {
                String message = task.getException().getMessage();
                Toast.makeText(getContext(), "Error Occured: " + message, Toast.LENGTH_SHORT).show();
            }
        }
    });
        }
    });
    return myTransport;
}