Develop Reference

Xamarin how to solve accessibility content labeling problem?

When i upload a relese to Google Play Console, after internal testing y have a warning (Accessibility => Content labeling) associated to this component.
<ImageButton .../>
Here the recomendation is use android:contentDescription
Then i add xmlns:android="http://schemas.android.com/apk/res/android"
and:
<ImageButton android:contentDescription="bla bla" .../>
But i get an error: The property contentDescription was not found in type ImageButton.
I try to use xct:SemanticEffect.Description and i have not compiler error but in Google Play Console i still see the warning.
More Information:
Full component code:
<ImageButton BackgroundColor="Transparent" Margin="5" xct:SemanticEffect.Description="abrir menú" Clicked="OnBackButtonClicked" >
<ImageButton.Source>
<FontImageSource FontFamily="FAL" Glyph="" Color="{StaticResource Gray3}" Size="25"/>
</ImageButton.Source>
</ImageButton>
Google Play Console - Pre-launch report details - Accesibility tab
Content labeling warning for this component

As already pointed out, you cannot add android:contentDescription="bla bla" directly to the ImageButton one is from the Android platform, the latter is on the Xamarin.Forms level.
If you use the Xamarin Community Toolkit and apply the SemanticEffect.Description="bla bla" that should translate into the contentDescription on Android. If that is not the case, I would be curious to know what the exact warning is that you get after applying it.

Street view is showing error message in android app

Hi Am working on google maps. i have added location in a fragment now am trying to add StreetViewPanoramaView to the fragment . But am getting Oops! something went wrong error message as shown in 2nd image
this is my code
maps_activity.xml
<Button
android:id="#+id/button_streetview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Open StreetView"
/>
<androidx.fragment.app.FragmentContainerView
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:context=".MapsActivity" />
<com.google.android.gms.maps.StreetViewPanoramaView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/streetview"/>
This is my MapActivity.kt
button_streetview.setOnClickListener(View.OnClickListener {
var mStreetViewPanoramaView : StreetViewPanoramaView = findViewById(R.id.streetview)
mStreetViewPanoramaView.onCreate(savedInstanceState)
var streetViewPanorama: StreetViewPanoramaOptions = StreetViewPanoramaOptions()
streetViewPanorama.panningGesturesEnabled(false)
streetViewPanorama.position(address)
streetViewPanorama.userNavigationEnabled(false)
streetViewPanorama.zoomGesturesEnabled(true)
var streetViewPanoramaCamera : StreetViewPanoramaCamera = StreetViewPanoramaCamera(25F,30F,1F)
streetViewPanorama.panoramaCamera(streetViewPanoramaCamera)
mStreetViewPanoramaView = StreetViewPanoramaView(this,streetViewPanorama)
mStreetViewPanoramaView.getStreetViewPanoramaAsync(this)
})
i can successfully retrive latitude and longitude of a place by address and display it in infoWindow and add custom marker as shown in image.
But when i click openstreetview button error message is coming.
This is the StreetView
This is the logcat
As This Error message is showing Wrong API key but i have added correct Key as i can retrive and display a marker successfully. Can anyone please tell me where am doing wrong

It looks like you are getting the error described here:
If you receive an error such as Your card does not support automatic
recurring payments or General decline of the card, please select a
different form of payment.
You might encounter these errors if you are using a debit card that
requires two-factor authentication to complete an online transaction.
Two-factor authentication requires you to be in-session at the time of
the transaction. Cards that require you to be in-session are not
usable for subscriptions or similar recurring automatic transactions.
Your street view map should work without problem once you enable billing on your project. Hope this helps!

Using Crosswalk in an Android Cordova Project with Embedded WebView

I have an existing Android Cordova project which uses an embedded WebView. What this means is that the Activity does not extend CordovaActivity, but instead embeds the SystemWebView and initializes within the onCreate.
The following is currently how this is being done:
Within the layout XML file
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
.... other layout elements not related to Cordova....
<org.apache.cordova.engine.SystemWebView
android:id="#+id/cdvWebView"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</RelativeLayout>
Within the Activity's onCreate:
SystemWebView systemWebView = (SystemWebView) findViewById(R.id.cdvWebView);
CordovaWebView cdvWebView = new CordovaWebViewImpl(new SystemWebViewEngine(systemWebView));
ConfigXmlParser parser = new ConfigXmlParser();
parser.parse(this);
cdvWebView.init(this, parser.getPluginEntries(), parser.getPreferences());
Due to the bug in Lollipop versions 5.0.+ missing the "set" button, I want to implement the Crosswalk plugin into the project.
Unfortunately, all the documentation I'm finding assumes that a typical Cordova install is being used. I haven't been able to get the embedding and initialization of the XWalkWebView working correctly and keep getting a blank white screen.
Has anybody has success with a similar scenario?

I'm not sure, but this might answer your question. It seems to show implementing an XWalkWebView outside of a typical cordova project:
https://github.com/kurli/crosswalk-website/wiki/How-to-use-Crosswalk-Embedded-API-on-Android

How to display Google Map in an Android app using Xamarin

I am designing an android app with Xamarin which will have an activity with google maps inside it, but i am struggling to display the map. It shows an empty box with no map display on it. Following is the code which i used for this practice.
My Activity
namespace teslin
{
[Activity(Label = "Map")]
public class MpActivity : Android.GoogleMaps.MapActivity
{
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
SetContentView(Resource.Layout.MapView);
var map = FindViewById<MapView>(Resource.Id.mapv);
map.Clickable = true;
map.Controller.SetZoom(16);
map.Controller.SetCenter(new GeoPoint((int)40.8270449E6, (int)-73.9279148E6));
}}
xml lay out
<LinearLayout
android:orientation="horizontal"
android:minWidth="25px"
android:minHeight="25px"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/linearLayout3"
android:layout_weight="9" />
<com.google.android.maps.MapView
android:id="#+id/mapv"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:enabled="true"
android:apiKey="AIzaSyD-UMij5IO6ezjuFCNnF7tRoG3niaPbNEU" />
</LinearLayout>

It looks like you're using the obsolete/outdated Maps API v1. Google removed support for this last year.
Instead you want to use Android Maps API v2 (a part of Google Play Services). Xamarin has some documentation on Maps in Android. It can be a bit tricky to get Maps working in Android, so carefully read these docs. Specifically, you'll want to read the section on the Maps API.
There is an example on Github that shows how to use the Google Play Services Component to add Maps to your application.

For those who are looking for a thorough example, check out this video that demonstrates how to integrate Google Maps with Xamarin Android, hope this helps!

RequestFactory validation fails when including Android maps v2 fragment

I have successfully used RequestFactory for a very long time in my Android app, but now when trying to upgrade to maps v2, when I include
<fragment
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
in my XML layout file, I get the error:
01-25 08:08:41.978: E/AndroidRuntime(19854):
java.lang.RuntimeException: Unable to resume activity{com.xx/com.xx.MyActivity}:
java.lang.RuntimeException: The RequestFactory ValidationTool must be
run for the com.xx.client.MyRequestFactory RequestFactory type
If I remove the fragment code from the layout XML file everything works fine.
How does this fragment affect my RequestFactory validation and how can I fix it?
Thanks.

As pointed out in How to Use the GWT-RequestFactory in Android SyncAdapter (always getting ValidationTool-Error)
if one adds
Thread.currentThread().setContextClassLoader(mContext.getClassLoader());
before
requestFactory = RequestFactorySource.create(factoryClass);
the problem is fixed.