Android一次获取用户位置 [英] Android get User Location once

问题描述

我知道这周围有很多事情，但是即使我(几乎)全部阅读了之后，仍然无法弄清问题所在.

I know that there are a lot of things around this but even after I read them all (almost) I still can't figure it out the issue.

基本上，我想在打开应用程序或按一个按钮并保存在共享首选项"时获取用户的精细位置". 我的旧代码可以正常工作，但是由于获取坐标的速度很慢，因此无法保存共享的首选项(GPS图标未显示在栏中).

Basically I want to get the user FINE LOCATION when I open the app or press a button and save on Shared Preferences. My old code worked but since was slow to get the coordinates, it fails to save on sharedpreferences (GPS icon don't show on bar).

OLD:

 public void askLocation() {
    if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
        LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
        Criteria criteria = new Criteria();
        String provider = locationManager.getBestProvider(criteria, true);
        try {
            mLocation = locationManager.getLastKnownLocation(provider);
        } catch (SecurityException e) {
            //
        }

        String currentCoordinates = somename.getString("LastLocation", "0,0");

        if (mLocation != null) {
            double currentLatitude = mLocation.getLatitude();
            double currentLongitude = mLocation.getLongitude();

            currentCoordinates = currentLatitude + "," + currentLongitude;
        }

        SharedPreferences.Editor editor = somename.edit();
        editor.putString("LastLocation", currentCoordinates).commit();

        Log.d("SomeName", "lastLocation start: " + currentCoordinates);
    }
}

我在Stackoverflow上的帖子中使用的我的新代码未正确显示(GPS图标显示在栏中):

My New code, used from a post on Stackoverflow, is not getting properly (GPS icon display on bar):

public void askLocation() {
    if (ContextCompat.checkSelfPermission(MainActivity.this,                                                 Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED)         {
        Criteria criteria = new Criteria();
        criteria.setAccuracy(Criteria.ACCURACY_COARSE);
        criteria.setPowerRequirement(Criteria.POWER_LOW);
        criteria.setAltitudeRequired(false);
        criteria.setBearingRequired(false);
        criteria.setSpeedRequired(false);
        criteria.setCostAllowed(true);
        criteria.setHorizontalAccuracy(Criteria.ACCURACY_HIGH);
        criteria.setVerticalAccuracy(Criteria.ACCURACY_HIGH);

        // Now create a location manager
        LocationManager locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        Looper looper = null;
        locationManager.requestSingleUpdate(criteria, locationListener, looper);

        String currentCoordinates = somename.getString("LastLocation", "0,0");
        Log.d("SomeName", "lastLocation askLocation: " + currentCoordinates);
    }
}

final LocationListener locationListener = new LocationListener() {
    @Override
    public void onLocationChanged(Location location) {
        mLocation = location;
        String currentCoordinates = somename.getString("LastLocation", "0,0");

        if (location != null) {
            double currentLatitude = location.getLatitude();
            double currentLongitude = location.getLongitude();

            currentCoordinates = currentLatitude + "," + currentLongitude;
        }

        SharedPreferences.Editor editor = somename.edit();
        editor.putString("LastLocation", currentCoordinates).commit();
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        Log.d("Status Changed", String.valueOf(status));
    }

    @Override
    public void onProviderEnabled(String provider) {
        Log.d("Provider Enabled", provider);
    }

    @Override
    public void onProviderDisabled(String provider) {
        Log.d("Provider Disabled", provider);
    }
};

谢谢.

推荐答案

打开应用程序或按一个按钮并保存在共享首选项"时，您可以尝试使用此方法获取一次位置.

You can try this method to get the location once when open the app or press a button and save on Shared Preferences.

               if (Constants.isOnline(getApplicationContext())) {
                        gps = new GPSTracker(v.getContext(),this);
                        if (gps.canGetLocation()) {

                            latitude = gps.getLatitude();
                            longitude = gps.getLongitude();
                            Log.e("Location ", "latitude : " + latitude + "longitude :" + longitude);

                        } else {
                            gps.showSettingsAlert();
                        }
                }

isOnline()用于检查用户是否具有Internet连接.

And the isOnline() is to check user has intenet connection on or not.

 public static boolean isOnline(Context c) {
    ConnectivityManager cm = (ConnectivityManager) c.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo netInfo = cm.getActiveNetworkInfo();
    if (netInfo != null && netInfo.isConnectedOrConnecting()) {
        return true;
    } else {
        Toast.makeText(c, "No Internet Connection.", Toast.LENGTH_SHORT).show();
    }
return false;

}

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