Android 请求片段中的位置权限

我想请求片段中的精细和粗略位置，以获得设备的位置。当我打开片段时，它会请求许可，但应用程序在此之前关闭。当我授予权限并重新打开应用程序时，它可以正常工作，但我希望应用程序在关闭之前不要关闭。我希望有人知道我做错了什么。。thx

import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;

import androidx.fragment.app.Fragment;
import androidx.core.content.ContextCompat;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;
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;


public class Location extends Fragment implements LocationListener, OnMapReadyCallback {

    View view;

    TextView textView_Longitude, textView_Latitute, textView_Altitute, textView_Speed;
    ImageView imageView_center_map;

    SupportMapFragment mapFragment;
    private GoogleMap mMap;

    android.location.Location location;

    private LocationListener locationListener = null;
    private LocationManager locationManager = null;

    private final long MIN_TIME = 1000;
    private final long MIN_DIST = 5;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.fragment_location, container, false);

        textView_Latitute = (TextView) view.findViewById(R.id.textView_Latitude);
        textView_Longitude = (TextView) view.findViewById(R.id.textView_Longitude);
        textView_Altitute = (TextView) view.findViewById(R.id.textView_Altitude);
        textView_Speed = (TextView) view.findViewById(R.id.textView_Speed);
        imageView_center_map = (ImageView) view.findViewById(R.id.imageView_center_map);

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

        locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);

        if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                && ContextCompat.checkSelfPermission(getActivity(),
                Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, PackageManager.PERMISSION_GRANTED);
            requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, PackageManager.PERMISSION_GRANTED);
        }

        if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
                && ContextCompat.checkSelfPermission(getActivity(),
                Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME, MIN_DIST, (LocationListener) this);
        } else {
            textView_Longitude.setText("no GPS Signal");
            textView_Latitute.setText("no GPS Signal");
        }

        location = locationManager.getLastKnownLocation(locationManager.NETWORK_PROVIDER);
        onLocationChanged(location);

        imageView_center_map.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                LatLng latLng_current_position = new LatLng(location.getLatitude(), location.getLongitude());
                mMap.addMarker(new MarkerOptions().position(latLng_current_position).title("You are here"));
                float zoomLevel = 15;
                mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng_current_position, zoomLevel));
            }
        });

        return view;
    }

    @Override
    public void onLocationChanged(android.location.Location location) {
        double latitute = location.getLatitude();
        double longitute = location.getLongitude();
        double altitute = Math.round(location.getAltitude());
        String string_latitute = String.valueOf(latitute);
        String string_longitute = String.valueOf(longitute);
        String string_altitute = String.valueOf(altitute);
        textView_Latitute.setText("Latitute: " + string_latitute);
        textView_Longitude.setText("Longitute: " + string_longitute);
        textView_Altitute.setText("Altitute: " + string_altitute + "m");
        float speed_in_kmh = (float) ((location.getSpeed() * 3600) / 1000);
        String string_speed = String.valueOf(speed_in_kmh);
        textView_Speed.setText("Speed: " + string_speed + "km/h");
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }


    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;

        LatLng latLng_current_position = new LatLng(location.getLatitude(), location.getLongitude());
        mMap.addMarker(new MarkerOptions().position(latLng_current_position).title("You are here"));
        float zoomLevel = 15;
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng_current_position, zoomLevel));

    }

}

试试这个：

        // Change these two lines
        // --------------------------------------------
//        requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, PackageManager.PERMISSION_GRANTED);
//        requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, PackageManager.PERMISSION_GRANTED);

        // to this one
        requestPermissions(new String[]{
                Manifest.permission.ACCESS_COARSE_LOCATION,
                Manifest.permission.ACCESS_COARSE_LOCATION
        }, PackageManager.PERMISSION_GRANTED);

试试这个：

        // Change these two lines
        // --------------------------------------------
//        requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, PackageManager.PERMISSION_GRANTED);
//        requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, PackageManager.PERMISSION_GRANTED);

        // to this one
        requestPermissions(new String[]{
                Manifest.permission.ACCESS_COARSE_LOCATION,
                Manifest.permission.ACCESS_COARSE_LOCATION
        }, PackageManager.PERMISSION_GRANTED);

---

您必须在“活动”中重写此方法，如果授予了权限，则只有您需要向网络或gps提供商请求定位

@Override
public void onRequestPermissionsResult(int requestCode,
    String[] permissions, int[] grantResults) {
switch (requestCode) {
    case MY_PERMISSIONS_REQUEST_READ_CONTACTS: {
        // If request is cancelled, the result arrays are empty.
        if (grantResults.length > 0
            && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            // permission was granted
           // here request to get location

        } else {
            // permission denied

        }
        return;
    }
}}

---

您必须在“活动”中重写此方法，如果授予了权限，则只有您需要向网络或gps提供商请求定位

@Override
public void onRequestPermissionsResult(int requestCode,
    String[] permissions, int[] grantResults) {
switch (requestCode) {
    case MY_PERMISSIONS_REQUEST_READ_CONTACTS: {
        // If request is cancelled, the result arrays are empty.
        if (grantResults.length > 0
            && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            // permission was granted
           // here request to get location

        } else {
            // permission denied

        }
        return;
    }
}}

---

请更换这个零件

 if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
                && ContextCompat.checkSelfPermission(getActivity(),
                Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME, MIN_DIST, (LocationListener) this);
        } else {
            textView_Longitude.setText("no GPS Signal");
            textView_Latitute.setText("no GPS Signal");
        }

---

请更换这个零件

 if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
                && ContextCompat.checkSelfPermission(getActivity(),
                Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME, MIN_DIST, (LocationListener) this);
        } else {
            textView_Longitude.setText("no GPS Signal");
            textView_Latitute.setText("no GPS Signal");
        }

---

您应该只调用

requestPermissions

方法一次，并在传递给它的字符串数组中请求多个权限您可以按照@RahulKhurana所说的做，或者只需从包含片段的活动中正常请求权限您应该只调用

requestPermissions

方法一次，并在字符串数组中请求多个权限传递给它的字符串数组你可以按照@RahulKhurana所说的做，或者只是正常地从包含碎片的活动中请求权限。因此，如果我启动应用程序，它会在不打开碎片的情况下请求授予权限，对吗？是的，你必须从activity请求权限，但当我切换到这个片段。。因为我希望用户可以在不授予权限的情况下使用应用程序的其他片段，那么在没有权限的情况下，您无法在片段中获取位置。可能的方式是，当在OnRequestPermissionsResult中授予权限时，您可以从活动中调用片段方法。因此，如果我启动应用程序，它会在不打开片段的情况下请求授予权限是吗？是的，你必须向Activity请求权限，但是当我切换到此片段时，是否只有权限请求才会打开。。因为我希望用户可以在不授予权限的情况下使用应用程序的其他片段，那么在没有权限的情况下，您无法在片段中获取位置。可能的方式是，当在OnRequestPermissionsResult中授予权限时，您可以从activity调用片段方法。Permissions结果替换了它，但应用程序也关闭了，而没有此部分替换了它，但应用程序关闭了也没有这个部分