问题描述
我只想使用 GeoFire 将我的位置上传到 firebase 数据库中。
DatabaseReference onlineRef,CurrentUserRef,DriverLocationRef;
GeoFire geoFire;
ValueEventListener onlineValueEventListener = new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
if (snapshot.exists())
CurrentUserRef.ondisconnect().removeValue();
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
Toast.makeText(HomeActivity.this,error.getMessage(),Toast.LENGTH_SHORT).show();
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
onlineRef = FirebaseDatabase.getInstance().getReference().child(".info/connected");
DriverLocationRef = FirebaseDatabase.getInstance().getReference(Common.Drivers_Location_Reference);
CurrentUserRef = FirebaseDatabase.getInstance().getReference(Common.Drivers_Location_Reference).child(FirebaseAuth.getInstance().getCurrentUser().getUid());
geoFire = new GeoFire(DriverLocationRef);
registerOnlinesystem();
getDeviceLocation();
}
@Override
protected void onResume() {
super.onResume();
registerOnlinesystem();
}
private void registerOnlinesystem() {
onlineRef.addValueEventListener(onlineValueEventListener);
}
@Override
protected void onDestroy() {
super.onDestroy();
geoFire.removeLocation(FirebaseAuth.getInstance().getCurrentUser().getUid());
mFusedLocationProviderClient.removeLocationUpdates(locationCallback);
onlineRef.removeEventListener(onlineValueEventListener);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setMyLocationButtonEnabled(true);
// Get the location at the center of the map each time the camera moves
mMap.setonCameraIdleListener(new GoogleMap.OnCameraIdleListener() {
@Override
public void onCameraIdle() {
latLng = mMap.getCameraPosition().target;
}
});
//reposition default GPS button on map
if (mapView != null && mapView.findViewById(Integer.parseInt("1")) != null) {
View locationButton = ((View) mapView.findViewById(Integer.parseInt("1")).getParent()).findViewById(Integer.parseInt("2"));
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) locationButton.getLayoutParams();
layoutParams.width = 100;
layoutParams.height = 100;
layoutParams.addRule(RelativeLayout.ALIGN_PARENT_TOP,0);
layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BottOM,RelativeLayout.TRUE);
layoutParams.setMargins(0,40,40);
}
//check if GPS is enabled or not and then request user to enable it.
LocationRequest locationRequest = LocationRequest.create();
locationRequest.setInterval(10000);
locationRequest.setFastestInterval(5000);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
//Handles location settings turned on/off
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder().addLocationRequest(locationRequest);
SettingsClient settingsClient = LocationServices.getSettingsClient(HomeActivity.this);
Task<LocationSettingsResponse> task = settingsClient.checkLocationSettings(builder.build());
task.addOnSuccessListener(HomeActivity.this,locationSettingsResponse -> getDeviceLocation());
task.addOnFailureListener(HomeActivity.this,new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
if (e instanceof ResolvableApiException) {
ResolvableApiException resolvable = (ResolvableApiException) e;
try {
resolvable.startResolutionForResult(HomeActivity.this,51);
} catch (IntentSender.SendIntentException ex) {
ex.printstacktrace();
}
}
}
});
}
private void getDeviceLocation() {
mFusedLocationProviderClient.getLastLocation().addOnCompleteListener(new OnCompleteListener<Location>() {
@Override
public void onComplete(@NonNull Task<Location> task) {
if (task.isSuccessful()) {
mLastKNownLocation = task.getResult();
if (mLastKNownLocation != null) {
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(mLastKNownLocation.getLatitude(),mLastKNownLocation.getLongitude()),DEFAULT_ZOOM));
} else {
locationRequest = new LocationRequest();
locationRequest.setInterval(10000);
locationRequest.setFastestInterval(5000);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationCallback = new LocationCallback() {
@Override
public void onLocationResult(LocationResult locationResult) {
super.onLocationResult(locationResult);
LatLng newPosition = new LatLng(locationResult.getLastLocation().getLatitude(),locationResult.getLastLocation().getLongitude());
mLastKNownLocation = locationResult.getLastLocation();
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(newPosition,DEFAULT_ZOOM));
//mFusedLocationProviderClient.removeLocationUpdates(locationCallback);
geoFire.setLocation(FirebaseAuth.getInstance().getCurrentUser().getUid(),new GeoLocation(locationResult.getLastLocation().getLatitude(),locationResult.getLastLocation().getLongitude()),(key,error) -> {
if (error != null){
Toast.makeText(HomeActivity.this,Toast.LENGTH_SHORT).show();
}
else {
Toast.makeText(HomeActivity.this,"You are online",Toast.LENGTH_SHORT).show();
}
});
}
};
mFusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(HomeActivity.this);
mFusedLocationProviderClient.requestLocationUpdates(locationRequest,locationCallback,Looper.myLooper());
}
} else {
Toast.makeText(HomeActivity.this,"Unable to get location",Toast.LENGTH_SHORT).show();
}
}
});
}
}
firebase 数据库规则：
{
/* Visit https://firebase.google.com/docs/database/security to learn more about security rules. */
"rules": {
".read": "auth!=null",".write": "auth!=null"
}
}
地图显示正常，但是当我打开活动时，我的当前位置没有上传。我想在打开活动时上传我的当前位置。当活动被销毁时，当前用户数据库中的位置将被删除。>
解决方法
我解决了这个问题。当 if 条件中 lastKnownLocation 不等于 null 时，我们必须在 geofire 中设置位置。
private void getDeviceLocation() {
mFusedLocationProviderClient.getLastLocation().addOnCompleteListener(new OnCompleteListener<Location>() {
@Override
public void onComplete(@NonNull Task<Location> task) {
if (task.isSuccessful()) {
mLastKnownLocation = task.getResult();
if (mLastKnownLocation != null) {
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(mLastKnownLocation.getLatitude(),mLastKnownLocation.getLongitude()),DEFAULT_ZOOM));
geoFire.setLocation(FirebaseAuth.getInstance().getCurrentUser().getUid(),new GeoLocation(mLastKnownLocation.getLatitude(),(key,error) -> {
if (error != null){
Toast.makeText(HomeActivity.this,error.getMessage(),Toast.LENGTH_SHORT).show();
}
else {
Toast.makeText(HomeActivity.this,"You are online",Toast.LENGTH_SHORT).show();
}
});
} else {
locationRequest = new LocationRequest();
locationRequest.setInterval(10000);
locationRequest.setFastestInterval(5000);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationCallback = new LocationCallback() {
@Override
public void onLocationResult(LocationResult locationResult) {
super.onLocationResult(locationResult);
LatLng newPosition = new LatLng(locationResult.getLastLocation().getLatitude(),locationResult.getLastLocation().getLongitude());
mLastKnownLocation = locationResult.getLastLocation();
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(newPosition,DEFAULT_ZOOM));
//mFusedLocationProviderClient.removeLocationUpdates(locationCallback);
geoFire.setLocation(FirebaseAuth.getInstance().getCurrentUser().getUid(),new GeoLocation(locationResult.getLastLocation().getLatitude(),locationResult.getLastLocation().getLongitude()),error) -> {
if (error != null){
Toast.makeText(HomeActivity.this,Toast.LENGTH_SHORT).show();
}
else {
Toast.makeText(HomeActivity.this,Toast.LENGTH_SHORT).show();
}
});
}
};
mFusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(HomeActivity.this);
mFusedLocationProviderClient.requestLocationUpdates(locationRequest,locationCallback,Looper.myLooper());
}
} else {
Toast.makeText(HomeActivity.this,"Unable to get location",Toast.LENGTH_SHORT).show();
}
}
});
}