Ich versuche, eine App zu machen, die den GPS-Standort meines Fahrrades verfolgen kann. Um zu beginnen, habe ich versucht, die GPS-Position meines eigenen Telefons zu lesen. Meine App stürzt immer ab, wenn ich versuche, das folgende Fragment zu starten. Ich habe einen Google API-Schlüssel für die App eingegeben und die Zeile "" in meine Manifest-Datei eingefügt. Was sind einige gute Möglichkeiten, dieses Problem zu debuggen? Ich bin neu in Android Studio, also würde ich gerne jede Art von Feedback hören.Android App Absturz mit FusedLocationProvider
//FindBikeFragment.java
import android.Manifest;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
/**
* A simple {@link Fragment} subclass.
*/
public class FindBikeFragment extends Fragment implements OnMapReadyCallback {
/**
* GoogleMaps object
*/
private GoogleMap mMap;
/**
* Provides the entry point to the Fused Location Provider API.
*/
private FusedLocationProviderClient mFusedLocationClient;
/**
* Represents a geographical location.
*/
protected Location mLastLocation;
public FindBikeFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_find_bike, container, false);
return v;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map1);
mapFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mFusedLocationClient = LocationServices.getFusedLocationProviderClient(getActivity());
if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getContext(), 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.
mLastLocation = mFusedLocationClient.getLastLocation().getResult();
LatLng pp = new LatLng(mLastLocation.getLatitude(), mLastLocation.getLongitude());
MarkerOptions option = new MarkerOptions();
option.position(pp).title("Some City");
mMap.addMarker(option);
mMap.moveCamera(CameraUpdateFactory.newLatLng(pp));
return;
}
}
}