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//make a collection to pack the parameter to send
List<KeyValuePair<String, String>> paramList = new List<KeyValuePair<String, String>>();
paramList.Add(new KeyValuePair<string, string>("action", "encode"));
paramList.Add(new KeyValuePair<string, string>("act", act));
paramList.Add(new KeyValuePair<string, string>("pwd", pwd));

//init a httpClient object  
//and about the ModernHttpClient, please reference below link
//https://github.com/paulcbetts/ModernHttpClient
HttpClient _httpClient = new HttpClient(new ModernHttpClient.NativeMessageHandler());

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;

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using Prism.Commands;
using Prism.Mvvm;
using Prism.Navigation;
using System;
using System.Collections.Generic;
using System.Linq;
using XFFirebase.Interface;

namespace XFFirebase.ViewModels
{

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<?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:prism="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
             prism:ViewModelLocator.AutowireViewModel="True"
             x:Class="XFFirebase.Views.MainPage"
             Title="MainPage">
  <StackLayout HorizontalOptions="Center" VerticalOptions="Center">
        <Button Text="測試 Firebase EveneLog" Command="{Binding clickEventLogbtnCommand}"/>
  </StackLayout>

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace XFFirebase.Interface
{
    interface IFireBaseAnalyticsService
    {

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using System;

using Android.App;
using Android.Content.PM;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using Prism.Unity;
using Microsoft.Practices.Unity;