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Xamarin開發新手！使用Visual Studio 2017以及我的開發環境的所有最新安裝和更新。Zxing.Net.Mobile Forms和MVVM Xaml未掃描
我有我的應用程序「外殼」工作，它會運行，瀏覽，crud本地數據庫，並同步休息服務。所以，我的應用程序的基礎是健全的。我正在嘗試將ZXing條碼掃描器集成到我的應用程序中。我找到的大部分幫助都與xaml背後的原始表單或代碼有關。我正在使用視圖和視圖模型，我不知道如何將我發現的信息轉換爲此模型。
我目前有一個xaml視圖，顯示單擊按鈕時的「相機查看器」，以便我可以使用相機查看條形碼。但是，攝像頭視圖中沒有「紅線」，隨後也沒有發生任何事件讓我知道發生了什麼。我真的很困惑，因爲我對Xamarin很新。我不知道從哪裏開始。
XAML瀏覽網頁
<?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"
xmlns:fe="clr-namespace:FreshEssentials;assembly=FreshEssentials"
xmlns:forms="clr-namespace:ZXing.Net.Mobile.Forms;assembly=ZXing.Net.Mobile.Forms"
prism:ViewModelLocator.AutowireViewModel="True"
x:Class="Views.InventoryPage1"
Title="Inventory Page">
<StackLayout Spacing="5" Padding="10,10,10,0">
<!--<fe:BindablePicker ItemsSource="{Binding Areas}" SelectedItem="{Binding SelectedArea}" DisplayProperty="AreaName" Title="Select Your Area" />
<fe:BindablePicker ItemsSource="{Binding Reasons}" SelectedItem="{Binding SelectedReason}"
DisplayProperty="Description" Title="Select a Reason" />
<Label Text="Scan"/>
<Entry Text="{Binding Barcode}"/>
<Label Text="Quantity"/>
<Entry Text="{Binding Quantity}"/>
<Button Text="Save" Style="{StaticResource Button_Primary}" Command="{Binding SaveCommand}" />-->
<forms:ZXingScannerView WidthRequest="100" HeightRequest="100" IsScanning="{Binding IsScanning}" IsAnalyzing="{Binding IsAnalyzing}" Result="{Binding Result, Mode=TwoWay}" ScanResultCommand="{Binding QRScanResultCommand}" ></forms:ZXingScannerView>
</StackLayout>
</ContentPage>
視圖模型
public class InventoryPage1ViewModel : BindableBase, INavigationAware
{
private readonly IPageDialogService _pageDialogService;
private bool _isAnalyzing = true;
private bool _isScanning = true;
public ZXing.Result Result { get; set; }
public List<Area> Areas { get; private set; }
public Area SelectedArea { get; set; }
public List<Reason> Reasons { get; private set; }
public Reason SelectedReason { get; set; }
public int Quantity { get; set; }
public string Barcode { get; set; }
public DelegateCommand SaveCommand => new DelegateCommand(PerformSave);
public DelegateCommand QRScanResultCommand => new DelegateCommand(QRCommand);
private readonly IAreaService _areaService;
private readonly IScanService _scanService;
private readonly IReasonService _reasonService;
public InventoryPage1ViewModel(IAreaService areaService, IScanService scanService, IReasonService reasonService, IPageDialogService pageDialogService)
{
_pageDialogService = pageDialogService;
_reasonService = reasonService;
_scanService = scanService;
_areaService = areaService;
Areas = _areaService.GetAll();
Reasons = _reasonService.GetAll();
}
public bool IsScanning
{
get
{
return _isScanning;
}
set
{
_isScanning = value;
RaisePropertyChanged();
}
}
public bool IsAnalyzing
{
get
{
return _isAnalyzing;
}
set
{
_isAnalyzing = value;
RaisePropertyChanged();
}
}
private void QRCommand()
{
int x = 1;
}
private async void PerformSave()
{
var scan = new Scan()
{
AreaId = SelectedArea.Id,
InsertDateTime = DateTime.Now,
ReasonId = SelectedReason.Id,
ScanItem = Barcode,
ScanQty = Quantity,
IsUploaded = false
};
// Save it to the DB here.
var retVal = _scanService.Insert(scan);
if (retVal)
{
await _pageDialogService.DisplayAlertAsync("Saved", "Scan saved successfully.", "OK");
}
else
{
// TODO: Inform the user something went wrong.
}
}
int _index;
public int SelectIndex
{
get
{
return _index;
}
set
{
_index = value;
RaisePropertyChanged("SelectIndex");
}
}
public void OnNavigatedFrom(NavigationParameters parameters)
{
}
public void OnNavigatedTo(NavigationParameters parameters)
{
}
public void OnNavigatingTo(NavigationParameters parameters)
{
}
}
MainActivity
public class MainActivity :
global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
protected override void OnCreate(Bundle bundle)
{
TabLayoutResource = Resource.Layout.tabs;
ToolbarResource = Resource.Layout.toolbar;
base.OnCreate(bundle);
global::Xamarin.Forms.Forms.Init(this, bundle);
ZXing.Net.Mobile.Forms.Android.Platform.Init();
LoadApplication(new App(new AndroidInitializer()));
}
public override void OnRequestPermissionsResult(int requestCode, string[] permissions, Permission[] grantResults)
{
ZXing.Net.Mobile.Android.PermissionsHandler.OnRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
public class AndroidInitializer : IPlatformInitializer
{
public void RegisterTypes(IUnityContainer container)
{
container.RegisterType<IConnectionFactory, ConnectionFactory>();
}
}
UPDATE 我現在有一個工作視圖模型由於在Xamarin.Forms @Krzysztof過。
新視圖模型
public class InventoryPage1ViewModel : BindableBase, INavigationAware
{
private readonly IPageDialogService _pageDialogService;
public List<Area> Areas { get; private set; }
public Area SelectedArea { get; set; }
public List<Reason> Reasons { get; private set; }
public Reason SelectedReason { get; set; }
public int Quantity { get; set; }
public DelegateCommand SaveCommand => new DelegateCommand(PerformSave);
private readonly IAreaService _areaService;
private readonly IScanService _scanService;
private readonly IReasonService _reasonService;
public InventoryPage1ViewModel(IAreaService areaService, IScanService scanService, IReasonService reasonService, IPageDialogService pageDialogService)
{
_pageDialogService = pageDialogService;
_reasonService = reasonService;
_scanService = scanService;
_areaService = areaService;
Areas = _areaService.GetAll();
Reasons = _reasonService.GetAll();
}
public ZXing.Result Result { get; set; }
private string barcode = string.Empty;
public string Barcode
{
get
{
return barcode;
}
set
{
barcode = value;
RaisePropertyChanged();
}
}
private bool isAnalyzing = true;
public bool IsAnalyzing
{
get { return this.isAnalyzing; }
set
{
if (!bool.Equals(this.isAnalyzing, value))
{
this.isAnalyzing = value;
RaisePropertyChanged(nameof(IsAnalyzing));
}
}
}
private bool isScanning = true;
public bool IsScanning
{
get { return this.isScanning; }
set
{
if (!bool.Equals(this.isScanning, value))
{
this.isScanning = value;
RaisePropertyChanged(nameof(IsScanning));
}
}
}
public Command QRScanResultCommand
{
get
{
return new Command(() =>
{
IsAnalyzing = false;
IsScanning = false;
Device.BeginInvokeOnMainThread(async() =>
{
Barcode = Result.Text;
await _pageDialogService.DisplayAlertAsync("Scanned Item", Result.Text, "Ok");
});
IsAnalyzing = true;
IsScanning = true;
});
}
}
private async void PerformSave()
{
var scan = new Scan()
{
AreaId = SelectedArea.Id,
InsertDateTime = DateTime.Now,
ReasonId = SelectedReason.Id,
ScanItem = Barcode,
ScanQty = Quantity,
IsUploaded = false
};
// Save it to the DB here.
var retVal = _scanService.Insert(scan);
if (retVal)
{
await _pageDialogService.DisplayAlertAsync("Saved", "Scan saved successfully.", "OK");
}
else
{
// TODO: Inform the user something went wrong.
}
}
public void OnNavigatedFrom(NavigationParameters parameters)
{
}
public void OnNavigatedTo(NavigationParameters parameters)
{
}
public void OnNavigatingTo(NavigationParameters parameters)
{
}
}