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using System.Threading.Tasks;
using Acelerometro.ViewModel;
using Xamarin.Forms;

namespace Acelerometro.View
{
    public class BasePage : ContentPage
    {
        public BasePage()
        {

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<views:BasePage xmlns="http://xamarin.com/schemas/2014/forms"
                xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                xmlns:views="clr-namespace:Acelerometro.View"
                xmlns:viewmodels="clr-namespace:Acelerometro.ViewModel"
                x:Class="Acelerometro.View.AccelerometerPage"
                Title="Accelerometer">
    <views:BasePage.BindingContext>
        <viewmodels:AccelerometerViewModel />
    </views:BasePage.BindingContext>

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<views:BasePage xmlns="http://xamarin.com/schemas/2014/forms"
                xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                xmlns:views="clr-namespace:Acelerometro.View"
                xmlns:viewmodels="clr-namespace:Acelerometro.ViewModel"
                x:Class="Acelerometro.View.AccelerometerPage"
                Title="Accelerometer">
    <views:BasePage.BindingContext>
        <viewmodels:AccelerometerViewModel />
    </views:BasePage.BindingContext>

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<views:BasePage
    x:Class="Bateria.View.BatteryPage"
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:viewmodels="clr-namespace:Bateria.ViewModel"
    xmlns:views="clr-namespace:Bateria.View"
    Title="Battery">
    <views:BasePage.BindingContext>
        <viewmodels:BatteryViewModel />
    </views:BasePage.BindingContext>

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namespace Bateria.View
{
    public partial class BatteryPage : BasePage
    {
        public BatteryPage()
        {
            InitializeComponent();
        }
    }
}

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using Xamarin.Essentials;

namespace Bateria.ViewModel
{
    public class BatteryViewModel : BaseViewModel
    {
        public BatteryViewModel()
        {
        }

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using Xamarin.Essentials;

namespace Bateria.ViewModel
{
    public class BatteryViewModel : BaseViewModel
    {
        public BatteryViewModel()
        {
        }

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<views:BasePage xmlns="http://xamarin.com/schemas/2014/forms"
                xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                xmlns:views="clr-namespace:Geocodificacion.View"
                xmlns:viewmodels="clr-namespace:Geocodificacion.ViewModel"
                x:Class="Geocodificacion.View.GeocodingPage"
                Title="Geocoding">
    <views:BasePage.BindingContext>
        <viewmodels:GeocodingViewModel />
    </views:BasePage.BindingContext>

devjaime

namespace Geocodificacion.View
{
    public partial class GeocodingPage : BasePage
    {
        public GeocodingPage()
        {
            InitializeComponent();
        }
    }
}

devjaime

using System;
using System.Linq;
using System.Windows.Input;
using Xamarin.Essentials;
using Xamarin.Forms;

namespace Samples.ViewModel
{
    public class GeocodingViewModel : BaseViewModel
    {