java - Android编程中如何获取当前位置

Question

在我的应用程序中，我想要获取用户当前位置，为此我编写了以下代码。
但在某些设备中不显示位置并显示null!

在我的应用程序中，我想要获取用户当前位置，为此我编写了以下代码。
但在某些设备中不显示位置并显示null!

我的 Java 代码:

void getLocation(Context context) {
    if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
        if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(mActivity, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION);

        } else {
            Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
            if (location != null) {
                double latti = location.getLatitude();
                double longi = location.getLongitude();
                try {
                    addresses = geocoder.getFromLocation(latti, longi, 1);
                    addressesORG = geocoderORG.getFromLocation(latti, longi, 1);
                    cityName = addresses.get(0).getLocality();
                    cityNameORG = addressesORG.get(0).getLocality();
                    prefsUtils.setToShared(PrefsKeys.CITY_NAME.name(), cityName);
                    prefsUtils.setToShared(PrefsKeys.CITY_NAME_ORG.name(), cityNameORG);
                    showSimpleWeather();
                } catch (IOException e) {
                    e.printStackTrace();
                    Log.e("locationClickedLog", "Err : " + e.getMessage());
                }
            } else {
            }
        }
    } else {
        Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
        Log.e("locationClickedLog", "" + location);
        if (location != null) {
            double latti = location.getLatitude();
            double longi = location.getLongitude();
            try {
                addresses = geocoder.getFromLocation(latti, longi, 1);
                addressesORG = geocoderORG.getFromLocation(latti, longi, 1);
                cityName = addresses.get(0).getLocality();
                cityNameORG = addressesORG.get(0).getLocality();
                prefsUtils.setToShared(PrefsKeys.CITY_NAME.name(), cityName);
                prefsUtils.setToShared(PrefsKeys.CITY_NAME_ORG.name(), cityNameORG);
                showSimpleWeather();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    switch (requestCode) {
        case REQUEST_LOCATION:
            getLocation(mContext);
            break;
    }
}

list 权限:

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

记录此内容时:Log.e("locationClickedLog", "" + location);显示 logCat 中的 null !

如何修复它？

Answer 1

网络位置提供商的名称。

This provider determines location based on availability of cell tower and WiFi access points. Results are retrieved by means of a network lookup.

其他情况尝试使用LocationManager.GPS_PROVIDER

查看此处https://www.androidhive.info/2012/07/android-gps-location-manager-tutorial/