将多个android activity的数据保存到一个Firebase数据库

Question

下面是我的两个活动的代码。通过这样编码，数据在FireBase中就这样存储了。这是存储数据的快照：

但是我想像这样在firebase中存储数据，我想像这样存储在注册号字段下：

我想将来自多个活动的数据存储在同一个子元素下，就像我在第二张屏幕截图中显示的那样。

AccountyActivity.java

 private void init() {

    mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
    mSettingsClient = LocationServices.getSettingsClient(this);

    mLocationCallback = new LocationCallback() {
        @Override
        public void onLocationResult(LocationResult locationResult) {
            super.onLocationResult(locationResult);
            // location is received
            mCurrentLocation = locationResult.getLastLocation();
            lot = mCurrentLocation.getLatitude();
            lgt = mCurrentLocation.getLongitude();
            lg = Double.toString(lgt);
            lt = Double.toString(lot);
            mAuth = FirebaseAuth.getInstance();
            FirebaseUser user = mAuth.getCurrentUser();

            UID = user.getUid();
            final DatabaseReference myRootRef = FirebaseDatabase.getInstance().getReferenceFromUrl("https://smartattendance-c896a.firebaseio.com/Users");

            DatabaseReference user1 = myRootRef.child(UID);
            user1.child("Longitude").setValue(lg);
            user1.child("Latitude").setValue(lt);

SignupActivity.java

private FirebaseAuth mAuth;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_sign_up);

    mAuth = FirebaseAuth.getInstance();

    final DatabaseReference myRootRef = FirebaseDatabase.getInstance().getReferenceFromUrl("https://smartattendance-c896a.firebaseio.com/Users");
    f1 = (EditText) findViewById(R.id.newUserName);
    f2 = (EditText) findViewById(R.id.newPassword);
    signUp = (Button) findViewById(R.id.signupbtn);
    signInLink = (TextView) findViewById(R.id.signinlink);
    tnc = (CheckBox) findViewById(R.id.tnc);
    f3 = (EditText) findViewById(R.id.cfmpassword);
    f4 = (EditText) findViewById(R.id.enroll);
    signUp.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            startSignup();
            String Enrollment = f4.getText().toString();

            String email = f1.getText().toString();
            String pass = f2.getText().toString();
            DatabaseReference user = myRootRef.child(Enrollment);
            user.child("Email").setValue(email);
            user.child("Password").setValue(pass);
        }
    });

Answer 1

将值从一个activity传递到另一个：

在SignupActivity中：

Intent i=new Intent(SignUpActivity.this,AccountyActivity.class);
                    i.putExtra("id",Enrollment);

然后在AccountyActivity中执行以下操作：

String id = getIntent().getStringExtra("id");
DatabaseReference myRootRef = FirebaseDatabase.getInstance().getReference("Users");
        DatabaseReference ref = myRootRef.child(id);

        Map<String, Object> childUpdates = new HashMap<>();
         childUpdates.put("Longitude", lg);
         childUpdates.put("Latitude",lt);

        ref.updateChildren(childUpdates);

您需要使用updatechildren以避免覆盖其他子节点。

https://firebase.google.com/docs/database/android/read-and-write#update_specific_fields