我是 Android 編碼的新手，并且已經撰寫了一個代碼來獲取 Android 設備的位置但失敗了。運行后沒有任何變化（例如mLastKnownLocationor cityName），也沒有例外。我已經檢查了權限和 build.gradle。你能給我一些建議來實施它嗎？
private void getDeviceLocation() {
try {
if (mLocationPermissionGranted) {
Task<Location> locationResult = mFusedLocationProviderClient.getCurrentLocation(Priority.PRIORITY_HIGH_ACCURACY,cancellationToken);
//Task<Location> locationResult = mFusedLocationProviderClient.getLastLocation();
locationResult.addOnCompleteListener(this, new OnCompleteListener<Location>(){
@Override
public void onComplete(@NonNull Task<Location> task) {
if (task.isSuccessful()) {
// Obtain the current location of the device
mLastKnownLocation = task.getResult();
String currentOrDefault = "Current";
if (mLastKnownLocation != null) {
Log.d(TAG, "Get current location");
} else {
Log.d(TAG, "Current location is null. Using defaults.");
currentOrDefault = "Default";
// Set current location to the default location
mLastKnownLocation = new Location("");
mLastKnownLocation.setLatitude(mDefaultLocation.latitude);
mLastKnownLocation.setLongitude(mDefaultLocation.longitude);
}
String city = "CorrectCity";
try {
List<Address> address =
geocoder.getFromLocation(mLastKnownLocation.getLatitude(),
mLastKnownLocation.getLongitude(), 1);
if(address.isEmpty())
city = "No_city";
else{
Address target = address.get(0);
if(target.getLocality()!=null)
city = target.getLocality();
else
city = target.getAdminArea();}
} catch (IOException e) {
Log.e("Exception: %s", e.getMessage());
}
cityName = city;
// Show location details on the location TextView
String msg = currentOrDefault " Location: "
Double.toString(mLastKnownLocation.getLatitude()) ", "
Double.toString(mLastKnownLocation.getLongitude()) " "
cityName;
locationTextView.setText(msg);
} else {
Log.d(TAG, "Current location is null. Using defaults.");
Log.e(TAG, "Exception: %s", task.getException());
/*mMap.moveCamera(CameraUpdateFactory
.newLatLngZoom(mDefaultLocation, DEFAULT_ZOOM));
mMap.getUiSettings().setMyLocationButtonEnabled(false);*/
}
}
});
}
} catch (SecurityException e) {
Log.e("Exception: %s", e.getMessage());
cityName = "ErrorCity";
}
}
}
uj5u.com熱心網友回復：
您可以使用下面的代碼獲取您最后的已知位置
FusedLocationProviderClient fusedLocationClient = LocationServices.getFusedLocationProviderClient(getContext());
fusedLocationClient.getLastLocation().addOnSuccessListener(location -> {
if (location != null) {
// your last known location is stored in `location`
}
});
參考：https ://developer.android.com/training/location/retrieve-current
使用Location Manager
LocationManager manager = (LocationManager) this.getSystemService(LOCATION_SERVICE);
LocationListener listener = new LocationListener() {
@Override
public void onLocationChanged(@NonNull Location location) {
mMap.clear();
LatLng userLocation = new LatLng(location.getLatitude(), location.getLongitude());
mMap.addMarker(new MarkerOptions().position(userLocation).title("Me"));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(userLocation, 15));
}
@Override
public void onProviderEnabled(@NonNull String provider) {
}
@Override
public void onProviderDisabled(@NonNull String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
};
manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, listener);
轉載請註明出處，本文鏈接：https://www.uj5u.com/caozuo/514739.html