当我按下按钮时有一个错误

Question

如果我按下呼叫按钮，我会得到一个错误，即出租车没有呼叫，而是转到另一个窗口。

   protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_customers_map);

    customerLogoutButton = (Button) findViewById(R.id.cuslomer_logout_button);
    settingsButton = (Button)findViewById(R.id.cuslomer_settings_button);
    callTaxiButton = (Button)findViewById(R.id.cuslomer_order_button);
    callDriver = findViewById(R.id.call_to_driver);

    mAuth = FirebaseAuth.getInstance();
    currentUser = mAuth.getCurrentUser();
    customerID = FirebaseAuth.getInstance().getCurrentUser().getUid();
    CustomerDatabaseRef = FirebaseDatabase.getInstance().getReference().child("Customers Requests");
    DriversAvailableRef = FirebaseDatabase.getInstance().getReference().child("Driver Available");
    DriversLocationRef = FirebaseDatabase.getInstance().getReference().child("Driver Working");

    txtName = (TextView)findViewById(R.id.driver_name);
    txtPhone = (TextView)findViewById(R.id.driver_phone_number);
    txtCarName = (TextView)findViewById(R.id.driver_car);
    driverPhoto = (CircleImageView)findViewById(R.id.driver_photo);
    relativeLayout = findViewById(R.id.rel1);

    relativeLayout.setVisibility(View.INVISIBLE);

    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);

    settingsButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(CustomersMapActivity.this, SettingsActivity.class);
            intent.putExtra("type", "Customers");
            startActivity(intent);
        }
    });

    customerLogoutButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mAuth.signOut();
            LogoutCustomer();
        }
    });

    callTaxiButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v)
        {
            if (requestType)
            {
                requestType = false;
                GeoFire geofire = new GeoFire(CustomerDatabaseRef);
                geofire.removeLocation(customerID);

                if(PickUpMarker !=null)
                {
                    PickUpMarker.remove();
                }
                if(driverMarker !=null)
                {
                    driverMarker.remove();
                }

                callTaxiButton.setText("Вызвать такси");
                if (driverFound!=null)
                {
                    DriversRef = FirebaseDatabase.getInstance().getReference()
                            .child("Users").child("Drivers").child(driverFoundID).child("CustomerRideID");

                    DriversRef.removeValue();

                    driverFoundID = null;
                }

                driverFound = false;
                radius = 1;


            }
            else {
                requestType = true;

                GeoFire geofire = new GeoFire(CustomerDatabaseRef);
                geofire.setLocation(customerID, new GeoLocation(lastLocation.getLatitude(), lastLocation.getLongitude()));

                CustomerPosition = new LatLng(lastLocation.getLatitude(), lastLocation.getLongitude());
                PickUpMarker = mMap.addMarker(new MarkerOptions().position(CustomerPosition).title("Я здесь").icon(BitmapDescriptorFactory.fromResource(R.drawable.user)));

                callTaxiButton.setText("Поиск водителя...");
                getNearbyDrivers();
            }


        }
    });
}

我认为这个错误来自实时数据库。如果你有不同的意见，写下你的答案。

错误：E/AndroidRuntime:致命异常：主进程：com。实例乌兹别克斯坦，PID:8915爪哇。lang.NullPointerException:尝试调用虚拟方法“double android”。地方地方getLatitude（）'位于com上的空对象引用上。实例乌兹别克语。CustomerMapActivity$3。android上的onClick（customerMapActivity.java:170）。看法看法android上的performClick（View.java:7125）。看法看法android上的performClickInternal（View.java:7102）。看法看法在android上访问3500美元（View.java:801）。看法查看$PerformClick。在android上运行（View.java:27336）。操作系统。处理程序。android上的handleCallback（Handler.java:883）。操作系统。处理程序。android上的dispatchMessage（Handler.java:100）。操作系统。活套。android上的loop（Looper.java:214）。应用程序。活动线程。java上的main（ActivityThread.java:7356）。朗。反思。方法在com上调用（本机方法）。Android内部的操作系统。RuntimeInit$MethodAndArgsCaller。在com上运行（RuntimeInit.java:492）。Android内部的操作系统。合子体。main（ZygoteInit.java:930）

在此输入图像描述

Answer 1

在运行代码之前，请尝试检查lastPlace是否为null。仅当lastPlace不为空时运行它：

if(lastLocation!=null){
 GeoFire geofire = new GeoFire(CustomerDatabaseRef);
                geofire.setLocation(customerID, new GeoLocation(lastLocation.getLatitude(), lastLocation.getLongitude()));

                CustomerPosition = new LatLng(lastLocation.getLatitude(), lastLocation.getLongitude());
                PickUpMarker = mMap.addMarker(new MarkerOptions().position(CustomerPosition).title("Я здесь").icon(BitmapDescriptorFactory.fromResource(R.drawable.user)));

                callTaxiButton.setText("Поиск водителя...");
                getNearbyDrivers();
}