Question

当前活动页面接受先前活动的用户ID，并搜索相应的用户并在地图上标记其位置。

没有编译错误。每当我在移动设备上访问此活动时，应用程序就会崩溃。

public class map extends FragmentActivity implements OnMapReadyCallback {
private String UserID;
private GoogleMap mMap;
private FirebaseFirestore db = FirebaseFirestore.getInstance();
private studetails stu;

//private LocationListener Locationlistener;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_map);
    // Obtain the SupportMapFragment and get notified when the map is ready to be used.
    UserID = getIntent().getExtras().getString("UserId");
    DocumentReference doc = db.collection("Userdetails").document(UserID);
    doc.get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
        @Override
        public void onSuccess(DocumentSnapshot documentSnapshot) {
            stu = documentSnapshot.toObject(studetails.class);
        }
    });

    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);

    //ActivityCompat.requestPermissions( activity: this,new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, PackageManager.PERMISSION_GRANTED);
    //ActivityCompat.requestPermissions( activity: this,new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, PackageManager.PERMISSION_GRANTED);
}


@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;
    Location loc;
    loc = stu.getlocation();
    // Add a marker in Sydney and move the camera
    LatLng sydney = new LatLng(loc.getLatitude(), loc.getLongitude());
    mMap.addMarker(new MarkerOptions().position(sydney).title("Busstop"));
    mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}

}

Custom Object used to push data into firestore

我是android-studio的新手，如果错过任何相关信息，请在下面提及。

Database Structure

Part of the logfile before APP crashed

Answer 1

根据您的日志FirebaseApp is not initialized in this process。我怀疑这是您的问题所在的行：

FirebaseFirestore db = FirebaseFirestore.getInstance();

与创建类实例一样，即使未正确设置FirebaseApp，它也会自动尝试获取默认的Firestore实例。

请不要在声明中初始化db，而应遵循onCreate，特别是在您致电FirebaseApp.initializeApp(this)

之后

从火场访问位置时，Android Studio应用会停止

1 个答案: