我已经通过FusedLocation创建了一个位置监听器。每次我记录的auth用户开始跟踪他们的位置时，该位置都是在currentuser user-id下写入的，但它会为在数据库中写入的每个位置添加不同的唯一ID。我需要那个地点＆＃39;使用我当前的登录用户说明（＆＃39;名称＆＃39;＆＃39;类型＆＃39;）在同一树中，每当我的当前用户有位置更改数据时，它将覆盖＆中的数据＃39;纬度＆＃39;和经度＆＃39;。我如何重建我的代码？
这是我的数据库截图 my firebase database
这是我的location.class
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.PendingResult;
import com.google.android.gms.common.api.Status;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import java.text.DateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;
/**
* Created by AKMAL NIZAR ROSLE on 12/6/2017.
*/
public class DriverActivity extends AppCompatActivity implements
LocationListener,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener {
private static final String TAG = "DriverActivity";
private static final long INTERVAL = 1000 * 10;
private static final long FASTEST_INTERVAL = 1000 * 5;
private FirebaseAuth auth;
private DatabaseReference databaseReference;
Button btnFusedLocation;
TextView tvLocation, textViewUser;
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
Location mCurrentLocation;
String mLastUpdateTime;
protected void createLocationRequest() {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(INTERVAL);
mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
auth = FirebaseAuth.getInstance();
//get current user
if (auth.getCurrentUser() == null) {
startActivity(new Intent(DriverActivity.this, LoginActivity.class));
finish();
}
databaseReference = FirebaseDatabase.getInstance().getReference();
Log.d(TAG, "onCreate ...............................");
//show error dialog if GoolglePlayServices not available
if (!isGooglePlayServicesAvailable()) {
finish();
}
createLocationRequest();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
setContentView(R.layout.activity_driver);
FirebaseUser user = auth.getCurrentUser();
textViewUser = (TextView) findViewById(R.id.textViewUser);
textViewUser.setText("Welcome"+" "+user.getEmail());
tvLocation = (TextView) findViewById(R.id.tvLocation);
btnFusedLocation = (Button) findViewById(R.id.btnShowLocation);
btnFusedLocation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
updateUI();
}
});
}
@Override
public void onStart() {
super.onStart();
Log.d(TAG, "onStart fired ..............");
mGoogleApiClient.connect();
}
@Override
public void onStop() {
super.onStop();
Log.d(TAG, "onStop fired ..............");
mGoogleApiClient.disconnect();
Log.d(TAG, "isConnected ...............: " + mGoogleApiClient.isConnected());
}
private boolean isGooglePlayServicesAvailable() {
final int PLAY_SERVICES_RESOLUTION_REQUEST = 9000;
GoogleApiAvailability apiAvailability = GoogleApiAvailability.getInstance();
int resultCode = apiAvailability.isGooglePlayServicesAvailable(this);
if (resultCode != ConnectionResult.SUCCESS) {
if (apiAvailability.isUserResolvableError(resultCode)) {
apiAvailability.getErrorDialog(this, resultCode, PLAY_SERVICES_RESOLUTION_REQUEST)
.show();
} else {
Log.d(TAG, "This device is not supported.");
}
return false;
}
return true;
}
@Override
public void onConnected(Bundle bundle) {
Log.d(TAG, "onConnected - isConnected ...............: " + mGoogleApiClient.isConnected());
startLocationUpdates();
}
protected void startLocationUpdates() {
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
LocationServices.FusedLocationApi.requestLocationUpdates(
mGoogleApiClient, mLocationRequest, this);
Log.d(TAG, "Location update started ..............: ");
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Log.d(TAG, "Connection failed: " + connectionResult.toString());
}
@Override
public void onLocationChanged(Location location) {
Log.d(TAG, "Firing onLocationChanged..............................................");
mCurrentLocation = location;
mLastUpdateTime = DateFormat.getTimeInstance().format(new Date());
saveToFirebase();
updateUI();
}
private void saveToFirebase() {
FirebaseUser user = auth.getCurrentUser();
Map mLocations = new HashMap();
Map mCoordinate = new HashMap();
mCoordinate.put("latitude", mCurrentLocation.getLatitude());
mCoordinate.put("longitude", mCurrentLocation.getLongitude());
mLocations.put("location", mCoordinate);
databaseReference.child(user.getUid()).push().setValue(mLocations);
}
private void updateUI() {
Log.d(TAG, "UI update initiated .............");
if (null != mCurrentLocation) {
String lat = String.valueOf(mCurrentLocation.getLatitude());
String lng = String.valueOf(mCurrentLocation.getLongitude());
tvLocation.setText("At Time: " + mLastUpdateTime + "\n" +
"Latitude: " + lat + "\n" +
"Longitude: " + lng + "\n" +
"Accuracy: " + mCurrentLocation.getAccuracy() + "\n" +
"Provider: " + mCurrentLocation.getProvider());
} else {
Log.d(TAG, "location is null ...............");
}
}
@Override
protected void onPause() {
super.onPause();
stopLocationUpdates();
}
protected void stopLocationUpdates() {
LocationServices.FusedLocationApi.removeLocationUpdates(
mGoogleApiClient, this);
Log.d(TAG, "Location update stopped .......................");
}
@Override
public void onResume() {
super.onResume();
if (mGoogleApiClient.isConnected()) {
startLocationUpdates();
Log.d(TAG, "Location update resumed .....................");
}
}
}
答案 0 :(得分：0)
private void saveToFirebase() {
FirebaseUser user = auth.getCurrentUser();
Map mLocations = new HashMap();
Map mCoordinate = new HashMap();
mCoordinate.put("latitude", mCurrentLocation.getLatitude());
mCoordinate.put("longitude", mCurrentLocation.getLongitude());
mLocations.put("location", mCoordinate);
databaseReference.child(user.getUid()).push().setValue(mLocations);
}
只需删除setValue数据库操作中的 push（）方法：
private void saveToFirebase() {
FirebaseUser user = auth.getCurrentUser();
Map mCoordinate = new HashMap();
mCoordinate.put("latitude", mCurrentLocation.getLatitude());
mCoordinate.put("longitude", mCurrentLocation.getLongitude());
databaseReference.child(user.getUid() + "/location").setValue(mCoordinate);
}
push（）方法生成一个新节点，其中包含数据库引用的唯一键。