java - 在android中获取当前位置一次

Question

我想在android中获取当前位置一次，所以我在stackoverflow中搜索，找到了这个解决方案: get the current location fast and once in android这正是我想要的。

我创建了 SingleShotLocationProvider 类，但收到错误“java.lang.SecurityException:“fused”位置提供程序需要 ACCESS_COARSE_LOCATION 或 ACCESS_FINE_LOCATION 权限。”来自 Android Studio。

我接受了 android studio 的提示来添加权限检查(代码如下)，但收到错误 SingleShotLocationProvider.this 无法从 ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) 中的静态上下文引用

如何解决这个问题？

public class SingleShotLocationProvider {

    public static interface LocationCallback {
        public void onNewLocationAvailable(GPSCoordinates location);
    }


    public static void requestSingleUpdate(final Context context, final LocationCallback callback) {
        final LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
        boolean isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
        if (isNetworkEnabled) {
            Criteria criteria = new Criteria();
            criteria.setAccuracy(Criteria.ACCURACY_COARSE);
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                //SingleShotLocationProvider.this cannot be referenced from a static context
                return;
            }
            locationManager.requestSingleUpdate(criteria, new LocationListener() {
                @Override
                public void onLocationChanged(Location location) {
                    callback.onNewLocationAvailable(new GPSCoordinates(location.getLatitude(), location.getLongitude()));
                }

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

                @Override
                public void onProviderEnabled(String provider) {
                }

                @Override
                public void onProviderDisabled(String provider) {
                }
            }, null);
        } else {
            boolean isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
            if (isGPSEnabled) {
                Criteria criteria = new Criteria();
                criteria.setAccuracy(Criteria.ACCURACY_FINE);
                locationManager.requestSingleUpdate(criteria, new LocationListener() {
                    @Override
                    public void onLocationChanged(Location location) {
                        callback.onNewLocationAvailable(new GPSCoordinates(location.getLatitude(), location.getLongitude()));
                    }

                    @Override public void onStatusChanged(String provider, int status, Bundle extras) { }
                    @Override public void onProviderEnabled(String provider) { }
                    @Override public void onProviderDisabled(String provider) { }
                }, null);
            }
        }
    }


    // consider returning Location instead of this dummy wrapper class
    public static class GPSCoordinates {
        public float longitude = -1;
        public float latitude = -1;

        public GPSCoordinates(float theLatitude, float theLongitude) {
            longitude = theLongitude;
            latitude = theLatitude;
        }

        public GPSCoordinates(double theLatitude, double theLongitude) {
            longitude = (float) theLongitude;
            latitude = (float) theLatitude;
        }
    }
}

list 权限:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

Answer 1

ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION)

更新:由于您不参与 Activity ，因此您可以通过以下方式检查权限:

ContextCompat.checkSelfPermission(contex,Manifest.permission.ACCESS_FINE_LOCATION);

并体现

<uses-permission-sdk-23 android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission-sdk-23 android:name="android.permission.ACCESS_COARSE_LOCATION" />