无法从 LocationManager 获取 Lat Long

Question

我正在尝试使用 LocationManager 获取登录用户的纬度和经度。我能够获得权限屏幕，并在允许后我想在文本视图上看到纬度和经度。但是，我无法在文本视图中看到任何内容。

protected void getLocation() {
        Log.v(TAG, "GetLocation");
        int LOCATION_REFRESH_TIME = 1000;
        int LOCATION_REFRESH_DISTANCE = 5;

        if (!(checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)) {
            Log.v("WEAVER_", "Has permission");
            mLocationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
            mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, LOCATION_REFRESH_TIME,
                    LOCATION_REFRESH_DISTANCE, mLocationListener);

        } else {
            Log.v("WEAVER_", "Does not have permission");
        }

    }

现在，我正在调用 mLocationListener，但没有得到任何结果，也没有任何错误。 OnLocationChanged() 方法未被调用。

 private final LocationListener mLocationListener = new LocationListener() {
        @Override
        public void onLocationChanged(Location location) {
            Log.v("WEAVER_", "Location Change");
            double latitude = location.getLatitude();
            textView.setText(String.valueOf(latitude) + "latitude");
            textView.setText(String.valueOf(updates) + " updates");
        }

这里，textView 没有显示任何内容，日志也没有更新位置更改事件。

日志结果为：

    08-21 14:35:29.336 3390-3390/daveytree.geo2 V/WEAVER_: GetLocation
08-21 14:35:29.337 3390-3390/daveytree.geo2 V/WEAVER_: Has permission
08-21 14:35:29.362 3390-3526/daveytree.geo2 D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true

是否有任何其他事件可以捕获此事件。请帮忙

Answer 1

由此 SO question, you can try to change the GPS_PROVIDER to NETWORK_PROVIDER. Because GPS_PROVIDER 使用卫星确定位置，根据情况，此提供商可能需要一段时间才能 return 定位。

有关更多信息，您还可以查看此相关的 SO 问题：

Unable to get location with gps location provider on android device
Can't Get GPS Current Location's Latitude and Longtitude Android
How do I get the current GPS location programmatically in Android?

无法从 LocationManager 获取 Lat Long

Unable to get Lat Long from LocationManager

android

google-maps

locationmanager