位置的请求权限对话框不显示

Posted 2023-02-19

【中文标题】位置的请求权限对话框不显示

【英文标题】：Request permission dialog for Location doesn't show

【发布时间】：2017-05-06 02:08:51

【问题描述】：

我的应用程序应该在GoogleMap 上显示我的当前位置。我的代码基于我发现的一篇有用的文章。但是，当它启动时，我的应用程序没有显示一个权限对话框来接受Location (android.Manifest.permission.ACCESS_FINE_LOCATION) 的权限，而且我总是得到Permission denied。有什么问题？这是我的主要活动代码：

public class MapsActivity extends FragmentActivity implements  OnMapReadyCallback,
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        LocationListener 

    GoogleMap mGoogleMap;
    SupportMapFragment mapFrag;
    LocationRequest mLocationRequest;
    GoogleApiClient mGoogleApiClient;
    Location mLastLocation;
    Marker mCurrLocationMarker;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);

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

    @Override
    public void onPause() 
        super.onPause();
        //stop location updates when Activity is no longer active
        if (mGoogleApiClient != null) 
            LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
        
    

    @Override
    public void onMapReady(GoogleMap googleMap) 
        mGoogleMap=googleMap;
        mGoogleMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);

        //Initialize Google Play Services
        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) 
            if (ContextCompat.checkSelfPermission(this,
                    android.Manifest.permission.ACCESS_FINE_LOCATION)
                    == PackageManager.PERMISSION_GRANTED) 
                //Location Permission already granted
                buildGoogleApiClient();
                mGoogleMap.setMyLocationEnabled(true);
             else 
                //Request Location Permission
                checkLocationPermission();
            
         else 
            buildGoogleApiClient();
            mGoogleMap.setMyLocationEnabled(true);
        
    

    protected synchronized void buildGoogleApiClient() 
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
        mGoogleApiClient.connect();
    

    @Override
    public void onConnected(Bundle bundle) 
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(1000);
        mLocationRequest.setFastestInterval(1000);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
        if (ContextCompat.checkSelfPermission(this,
                android.Manifest.permission.ACCESS_FINE_LOCATION)
                == PackageManager.PERMISSION_GRANTED) 
            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
        
    

    @Override
    public void onConnectionSuspended(int i) 

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) 

    @Override
    public void onLocationChanged(Location location) 
        mLastLocation = location;
        if (mCurrLocationMarker != null) 
            mCurrLocationMarker.remove();
        

        //Place current location marker
        LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.position(latLng);
        markerOptions.title("Current Position");
        markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
        mCurrLocationMarker = mGoogleMap.addMarker(markerOptions);

        //move map camera
        mGoogleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
        mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(11));

        //optionally, stop location updates if only current location is needed
        if (mGoogleApiClient != null) 
            LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
        
    

    public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;

    private void checkLocationPermission() 
        if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) 

            // Should we show an explanation?
            if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                    android.Manifest.permission.ACCESS_FINE_LOCATION)) 

                // Show an explanation to the user *asynchronously* -- don't block
                // this thread waiting for the user's response! After the user
                // sees the explanation, try again to request the permission.
                new AlertDialog.Builder(this)
                        .setTitle("Location Permission Needed")
                        .setMessage("This app needs the Location permission, please accept to use location functionality")
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() 
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) 
                                //Prompt the user once explanation has been shown
                                ActivityCompat.requestPermissions(MapsActivity.this,
                                        new String[]android.Manifest.permission.ACCESS_FINE_LOCATION,
                                        MY_PERMISSIONS_REQUEST_LOCATION );
                            
                        )
                        .create()
                        .show();
             else 
                // No explanation needed, we can request the permission.
                ActivityCompat.requestPermissions(this,
                        new String[]android.Manifest.permission.ACCESS_FINE_LOCATION,
                        MY_PERMISSIONS_REQUEST_LOCATION );
            
        
    

    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) 
        switch (requestCode) 
            case MY_PERMISSIONS_REQUEST_LOCATION: 
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) 

                    // permission was granted, yay! Do the
                    // location-related task you need to do.
                    if (ContextCompat.checkSelfPermission(this,
                            android.Manifest.permission.ACCESS_FINE_LOCATION)
                            == PackageManager.PERMISSION_GRANTED) 

                        if (mGoogleApiClient == null) 
                            buildGoogleApiClient();
                        
                        mGoogleMap.setMyLocationEnabled(true);
                    
                 else 
                    // permission denied, boo! Disable the
                    // functionality that depends on this permission.
                    Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
                
                return;
            

            // other 'case' lines to check for other
            // permissions this app might request
        
    

【问题讨论】：

赞成票 0 反对票 接受我尝试了您的提议，但我再次收到了我的 Toast：“Permission Denied”。如果我在手机上查看设置，系统会说这个应用程序不需要权限。问候多米尼克

【参考方案1】：

从设备中删除应用程序。然后再次运行。