Android Ask for permission to use location within

I have an application that uses a webview and inside the webview is a map, I have got it working to the user automatically find the users location with the following code:

Manifest file Permissions:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_GPS" />
<uses-permission android:name="android.permission.ACCESS_ASSISTED_GPS" />
<uses-permission android:name="android.permission.ACCESS_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

WebView Activity:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.map_layout);

    WebViewSettings();

    LoadWebPage(urlString);
}

WebView Settings:

@SuppressLint("SetJavaScriptEnabled")
public void WebViewSettings(){

    webView = (WebView) findViewById(R.id.webview);
    webView.canGoBack();

    webView.getSettings().setJavaScriptEnabled(true);
    webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
    webView.getSettings().setBuiltInZoomControls(true);
    webView.getSettings().setSupportZoom(true);
    webView.getSettings().setLoadWithOverviewMode(true);
    webView.setWebViewClient(new WebViewClientSetup());
    webView.setWebChromeClient(new GeoWebChromeClient());
    webView.getSettings().setGeolocationEnabled(true);

    myTimer = new Timer();
    //Start this timer when you create you task
    myTimer.schedule(new loaderTask(), 20000);

}

WebViewClient:

public class WebViewClientSetup extends WebViewClient {

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        return false;
    }

    @Override
    public void onLoadResource(WebView view, String url) {
        // Check to see if there is a progress dialog
        if (progressDialog == null) {
            progressDialog = new ProgressDialog(context);
            progressDialog.setTitle("Loading...");
            progressDialog.setMessage("Please wait.");
            progressDialog.setCancelable(true);
            progressDialog.setIndeterminate(true);
            progressDialog.show();
        }
    }

    @Override
    public void onReceivedSslError(WebView view, SslErrorHandler handler,
            SslError error) {
        handler.proceed();
    }

    @Override
    public void onPageFinished(WebView view, String url) {
        isPageLoadedComplete = true;
        View mapHeight = (View) findViewById(R.id.webview);
        int height = mapHeight.getHeight();
        Log.d("map height", "map height" + height);
        // Page is done loading;
        // hide the progress dialog and show the webview
        if (progressDialog.isShowing()) {
            progressDialog.dismiss();
        }
    }

    @Override
    public void onReceivedError(WebView view, int errorCod,
            String description, String failingUrl) {
        AlertDialog();
    }
}

WebChromeClient:

public class GeoWebChromeClient extends WebChromeClient {
    @Override
    public void onGeolocationPermissionsShowPrompt(String origin, GeolocationPermissions.Callback callback) {
        callback.invoke(origin, true, false);
    }
}

So this is working but it automatically gets the users' location without prompting the user if the app can use location services.

Is there a way to add this functionality to the app? Thanks

That's because you need to create the prompt. The onGeolocationPermissionsShowPrompt function is simply called to let you know the webpage wants the location.

callback.invoke(origin, true, false); is the response telling the WebView it's OK to use the location.

The last argument is whether or not to remember this setting. See: http://developer.android.com/reference/android/webkit/GeolocationPermissions.Callback.html

Example:

AlertDialog.Builder adb = new AlertDialog.Builder(context);
..... //set up title, message, etc
adb.setNegativeButton(android.R.string.ok, new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int which) {
        callback.invoke(origin, false, false);
    }
});
adb.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int which) {
        callback.invoke(origin, true, false);
    }
});
adb.show();