Accsses geo location in webview

Embape

In Xamarin.android I created a webview like this :

               protected override void OnCreate(Bundle savedInstanceState)
                {
                        base.OnCreate(savedInstanceState);
                        SetContentView(Resource.Layout.activity_main);

                        var webView = FindViewById<WebView>(Resource.Id.webView);

                        webView.Settings.JavaScriptEnabled = true;
                        webView.Settings.JavaScriptCanOpenWindowsAutomatically = true;
                        webView.Settings.DomStorageEnabled = true;
                        webView.Settings.SetGeolocationEnabled(true);
                        webView.Settings.SetAppCacheEnabled(true);
                        webView.SetWebChromeClient(new HybridWebViewChormClient());
                        webView.LoadUrl("myaddress");

                }

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

                    }


                }

and set this permission > Access_fine_location in android manifest
but the webview can't get access location
note : in external browser like chrome or Firefox access location works fine
i try it in android 9 pie

LandLu

@Embape For Api 23+, we have to request the runtime permission to enable the location service on Android. Try my activity to test your webpage again:

public class MainActivity : Activity
{
    public String mGeolocationOrigin;
    public GeolocationPermissions.ICallback mGeolocationCallback;
    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);

        // Initialize the permission plugin
        Plugin.CurrentActivity.CrossCurrentActivity.Current.Init(this, savedInstanceState);

        SetContentView(Resource.Layout.main_layout);

        var webView = FindViewById<WebView>(Resource.Id.webView);
        webView.Settings.JavaScriptEnabled = true;
        webView.SetWebChromeClient(new WebViewChormClient(this));

        // I used a local webpage to test
        webView.LoadUrl("file:///android_asset/localPage.html");

    }

    public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
    {
        PermissionsImplementation.Current.OnRequestPermissionsResult(requestCode, permissions, grantResults);
        base.OnRequestPermissionsResult(requestCode, permissions, grantResults);

        if (permissions.Contains(Manifest.Permission.AccessFineLocation))
        {
            bool allow = false;
            if (grantResults[0] == Android.Content.PM.Permission.Granted)
            {
                // user has allowed these permissions
                allow = true;
            }
            if (mGeolocationCallback != null)
            {
                mGeolocationCallback.Invoke(mGeolocationOrigin, allow, false);
            }
        }
    }
}

public class WebViewChormClient : WebChromeClient
{
    MainActivity currentActivity;

    public WebViewChormClient(MainActivity activity)
    {
        currentActivity = activity;
    }
    public async override void OnGeolocationPermissionsShowPrompt(string origin, GeolocationPermissions.ICallback callback)
    {
        var status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Location);
        if (Build.VERSION.SdkInt < BuildVersionCodes.M || status == PermissionStatus.Granted)
        {
            // we're on SDK < 23 OR user has already granted permission
            callback.Invoke(origin, true, false);
        }
        else
        {                
            // ask the user for permissions
            var results = await CrossPermissions.Current.RequestPermissionsAsync(Permission.Location);
            //Best practice to always check that the key exists
            if (results.ContainsKey(Permission.Location))
                status = results[Permission.Location];
            currentActivity.mGeolocationOrigin = origin;
            currentActivity.mGeolocationCallback = callback;
        }
    }

}

Here I used https://github.com/jamesmontemagno/PermissionsPlugin to request the runtime permissions.

LandLu

Did you use the correct permissions?
Try to check this thread: https://stackoverflow.com/questions/5329662/android-webview-geolocation
It lists all the permissions for referring.

Embape

yes i had tried those solutions before that but doesn't work

LandLu

@Embape For Api 23+, we have to request the runtime permission to enable the location service on Android. Try my activity to test your webpage again:

public class MainActivity : Activity
{
    public String mGeolocationOrigin;
    public GeolocationPermissions.ICallback mGeolocationCallback;
    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);

        // Initialize the permission plugin
        Plugin.CurrentActivity.CrossCurrentActivity.Current.Init(this, savedInstanceState);

        SetContentView(Resource.Layout.main_layout);

        var webView = FindViewById<WebView>(Resource.Id.webView);
        webView.Settings.JavaScriptEnabled = true;
        webView.SetWebChromeClient(new WebViewChormClient(this));

        // I used a local webpage to test
        webView.LoadUrl("file:///android_asset/localPage.html");

    }

    public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
    {
        PermissionsImplementation.Current.OnRequestPermissionsResult(requestCode, permissions, grantResults);
        base.OnRequestPermissionsResult(requestCode, permissions, grantResults);

        if (permissions.Contains(Manifest.Permission.AccessFineLocation))
        {
            bool allow = false;
            if (grantResults[0] == Android.Content.PM.Permission.Granted)
            {
                // user has allowed these permissions
                allow = true;
            }
            if (mGeolocationCallback != null)
            {
                mGeolocationCallback.Invoke(mGeolocationOrigin, allow, false);
            }
        }
    }
}

public class WebViewChormClient : WebChromeClient
{
    MainActivity currentActivity;

    public WebViewChormClient(MainActivity activity)
    {
        currentActivity = activity;
    }
    public async override void OnGeolocationPermissionsShowPrompt(string origin, GeolocationPermissions.ICallback callback)
    {
        var status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Location);
        if (Build.VERSION.SdkInt < BuildVersionCodes.M || status == PermissionStatus.Granted)
        {
            // we're on SDK < 23 OR user has already granted permission
            callback.Invoke(origin, true, false);
        }
        else
        {                
            // ask the user for permissions
            var results = await CrossPermissions.Current.RequestPermissionsAsync(Permission.Location);
            //Best practice to always check that the key exists
            if (results.ContainsKey(Permission.Location))
                status = results[Permission.Location];
            currentActivity.mGeolocationOrigin = origin;
            currentActivity.mGeolocationCallback = callback;
        }
    }

}

Here I used https://github.com/jamesmontemagno/PermissionsPlugin to request the runtime permissions.