Xamarin Webview 不提供纬度和经度

Question

我有一个显示不同位置的纬度和经度数据的网络应用程序。我正在尝试使用在 Xamarin 中使用 Web 视图开发的 android 应用程序打开相同的 Web 应用程序。但是纬度和经度显示为空白。当我使用 Chrome 浏览器时，它工作正常。请帮我。

protected override void OnCreate(Bundle savedInstanceState)
{
    base.OnCreate(savedInstanceState);
    SetContentView(Resource.Layout.layout3);
    web_view = FindViewById<WebView>(Resource.Id.webview);
    web_view.Settings.JavaScriptEnabled = true;
    web_view.Settings.SetGeolocationEnabled(true);
    web_view.SetWebViewClient(new HelloWebViewClient());
    web_view.SetWebChromeClient(new GeoWebChromeClient());
    web_view.Settings.JavaScriptCanOpenWindowsAutomatically = true;
    web_view.Settings.DisplayZoomControls = true;
    web_view.Settings.JavaScriptEnabled = true;
    web_view.Settings.SetGeolocationEnabled(true);
    web_view.LoadUrl("https://abcd.com");
}


class GeoWebChromeClient : WebChromeClient
{
    public override void OnGeolocationPermissionsShowPrompt(string origin, GeolocationPermissions.ICallback callback)
    {
        callback.Invoke(origin, false, false);
    }

}



class HelloWebViewClient:WebViewClient
{
    // For API level 24 and later
    public override bool ShouldOverrideUrlLoading(WebView view, IWebResourceRequest request)
    {
        view.LoadUrl(request.Url.ToString());
        return false;
    }
}

Answer 1

将此添加到清单文件中。

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

在 Activity 中添加这个：然后尝试获取位置值。

public static final int MY_PERMISSIONS_REQUEST_LOCATION = 100;

public boolean checkLocationPermission() {
    if (ContextCompat.checkSelfPermission(this,
            Manifest.permission.ACCESS_FINE_LOCATION)
            != PackageManager.PERMISSION_GRANTED) {

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

            //  try again to request the permission.

        } else {
            // No explanation needed, we can request the permission.
            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                    MY_PERMISSIONS_REQUEST_LOCATION);
        }
        return false;
    } else {
        return true;
    }
}

@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,
                        Manifest.permission.ACCESS_FINE_LOCATION)
                        == PackageManager.PERMISSION_GRANTED) {

                    //Request location updates:
                    locationManager.requestLocationUpdates(provider, 400, 1, this);
                }

            } else {

                // permission denied, boo! Disable the
                // functionality that depends on this permission.

            }
            return;
        }

    }
}