Get location from website using web view for Android

Question

I am trying to show the pop up for allowing using of location in a web view for my android app, but whenever I visit a page that should use the location, the pop up for requesting using of locations never shows up and therefore the location coordinates never show up.

Any idea what I am missing?

web.setWebChromeClient(new WebChromeClient(){
                            @Override
                            public void onGeolocationPermissionsShowPrompt(final String origin, final GeolocationPermissions.Callback callback) {

                                final boolean remember = true;
                                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                                builder.setTitle("Locations");
                                builder.setMessage(origin + " Would like to use your Current Location").setCancelable(true).setPositiveButton("Allow",
                                        new DialogInterface.OnClickListener() {
                                            @Override
                                            public void onClick(DialogInterface dialog,
                                                                int id) {
                                                // origin, allow, remember
                                                callback.invoke(origin, true, remember);
                                            }
                                        })
                                        .setNegativeButton("Don't Allow",
                                                new DialogInterface.OnClickListener() {
                                                    @Override
                                                    public void onClick(DialogInterface dialog,
                                                                        int id) {
                                                        // origin, allow, remember
                                                        callback.invoke(origin, false, remember);
                                                    }
                                                });
                                AlertDialog alert = builder.create();
                                alert.show();


                                super.onGeolocationPermissionsShowPrompt(origin, callback);
                            }
                        });