Question

我有一个Android项目，在不同的设备上有2个应用程序。我使用Firebase设置了后端服务。我有两种不同类型的用户，Rider和Driver。从RiderApp，我保存到数据库。

我想做的是检索保存到数据库中的值。

Firebase被设置为一个项目，两个应用共享相同的google-services.json。

我的问题是，如果我在DriverApp中，如何获取theRiderApp的用户名？

如果我将userId = firebaseUser.getUid（）->获取我所在的应用程序的当前驱动程序，但如何获取RiderApp的userId才能成功完成此“读取Firebase”

Firebase结构示例：

{
  "Requests": {
    "khVbT88fA8YUmt5qv5LG0OTVZEm1": {
      ".priority": "f81189yp46",
      "destination": {
        "searchBar": "43 Union Street"
      },
      "g": "f81189yp46",
      "l": [
        45.274498,
        -66.0634308
      ]
    }
  },
  "Users": {
    "Drivers": {
      "RAFIxzcAYjNNIU15IMIVHfr0CMC2": {
        "email": "driver2@me.com",
        "name": "LizG",
        "password": "zzzzzz",
        "phone": "6532525"
      },
      "vP9r4F2yDWRRuvKjRiQvMEXVuoK2": {
       "email": "driver@me.com",
        "name": "Batman",
        "password": "zzzzzz",
        "phone": "5326598",
        "rates": "0"
      }
    },
    "Riders": {
      "khVbT88fA8YUmt5qv5LG0OTVZEm1": {
        "avatarUrl": "",
        "email": "rider@me.com",
        "name": "Rider",
        "password": "zzzzzz",
        "phone": "5551211",
        "rates": "0"
      }
    }
  }
}

UserId =“用户/乘员”当前的userId 我正在从我的DriverApp中检索“ Requests / userId / destination / searchBar

中的值

任何帮助将不胜感激。

已编辑

private void findDriver() {

    final DatabaseReference drivers = FirebaseDatabase.getInstance().getReference(
            Common.driver_tbl);
    GeoFire gfDrivers = new GeoFire(drivers);

    GeoQuery geoQuery = gfDrivers.queryAtLocation(new GeoLocation(Common.mLastLocation.getLatitude(),
            Common.mLastLocation.getLongitude()), radius);
    geoQuery.removeAllListeners();
    geoQuery.addGeoQueryEventListener(new GeoQueryEventListener() {
        @Override
        public void onKeyEntered(String key, GeoLocation location) {
            // if found
            if (!Common.isDriverFound) {
                Common.isDriverFound = true;
                Common.driverId = key;
                btnRequest.setText("CALL DRIVER");
                //                    Toast.makeText(RiderHome.this, "Request Sent",
                //                            Toast.LENGTH_LONG).show();
            }
        }

        @Override
        public void onKeyExited(String key) { }

        @Override
        public void onKeyMoved(String key, GeoLocation location) { }

        @Override
        public void onGeoQueryReady() {
            // if still not found driver, increase distance
            if (!Common.isDriverFound && radius < LIMIT) {
                radius++;
                findDriver();


            } else if (!Common.isDriverFound) {
                Toast.makeText(RiderHome.this, "There are NO available drivers near you.",
                        Toast.LENGTH_LONG).show();
                btnRequest.setText("REQUEST RYYDE");
            }
        }

        @Override
        public void onGeoQueryError(DatabaseError error) {}
    });
}

更新代码

当运行产生结果时： {RBUUID8JNihtbMmvwgcjZVgj2Ku2 = {driver = wLY5SqTxiLTUhToZdcyRh8uqNKF3，g = f8118dn88t，destination = {tapOnMap = Somerset St}，l = [45.2747733，-66.0628253]}}

Query query = FirebaseDatabase.getInstance().getReference().child("Requests")
            .orderByChild("driver").equalTo(driverId);
    query.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            String riderDest = String.valueOf(dataSnapshot.getValue());
            etDestination.setText(riderDest);
            Log.d(TAG, "riderDest = " + riderDest);
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            System.out.println("The read failed: " + databaseError.getCode());
        }
    });

Answer 1

如何获取theRiderApp的用户名？

除非在骑手和驾驶员之间建立连接，否则您不能。因此，在创建请求时，还应将相应的驱动程序分配给特定的request。然后，您只需查询数据库即可从请求对象中获取所有数据，包括相应的驱动程序。

您更改后的请求节点应如下所示：

"Requests": {
  "khVbT88fA8YUmt5qv5LG0OTVZEm1": {
    ".priority": "f81189yp46",
    "destination": {
      "searchBar": "43 Union Street"
    },
    "g": "f81189yp46",
    "driver": "RAFIxzcAYjNNIU15IMIVHfr0CMC2", //driver id added
    "l": [
      45.274498,
      -66.0634308
    ]
  }
},

如您所见，现在请求对象包含驾驶员ID和属性ID作为驾驶员节点的键。

在数据库中获取其他用户类型的userId

1 个答案: