xamarin.forms Package restore failed - xamarin

Question

I am using visual studio 15.6.0 version. I have the following SDK Manager installed:
I am trying to use Google maps in my application. Below is my code on main.xaml
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:App1"
xmlns:maps="clr-namespace:Xamarin.Forms.Maps;assembly=Xamarin.Forms.Maps"
x:Class="App1.MainPage">
<maps:Map x:Name="MainMap"></maps:Map>
</ContentPage>
I also installed Xamarin.forms.maps. After that I am trying to install Xamarin.playservices.Base ,
Xamarin.playservices.Basement,
Xamarin.playservices.maps and
Xamarin.playservices.taks using nuget. Below is the image for manage nuget pacakges
I keep getting the below error when I tried to install this through nugget
Package restore failed. Rolling back package changes for 'App1.Android'.
Do I need Xamarin.playservices.Base, Basement, Tasks in order to use Google maps? My main.xaml.cs code looks like this:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
using Xamarin.Forms.Maps;
namespace App1
{
public partial class MainPage : ContentPage
{
public MainPage()
{
InitializeComponent();
}
protected override void OnAppearing()
{
base.OnAppearing();
MainMap.MoveToRegion(MapSpan.FromCenterAndRadius(new Position(36.89, 10.18), Distance.FromKilometers(5)));
}
}
}
when I tried to run the application, I don't see any maps although I can see the icon for app1 and when I double click a blank page comes up. My android manifest file looks like below:
and my android manifest.xml file looks like this
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.co.App1" android:installLocation="auto">
<uses-sdk android:minSdkVersion="15" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application android:label="$safeprojectname$">
<meta-data android:label="com.google.android.maps.geo.API_KEY" android:value="AIzaSyDxhj-n96-YaWHibZU2e5BK02U9UzRCnC0" />
</application>
</manifest>
Below is the compile target version:
below is the image of the references that are added to my project:

Answer 1

Do I need Xamarin.playservices.Base, Basement, Tasks in order to use Google maps?
Actually, with VS 15.6, there is no need to install Xamarin.playservices.Base and other dependencies independently. When you are installing Xamarin.Forms.Maps to the native project, the related dependencies will be referenced into your project, and you will be notified by a pop-up dialog: