Xamarin 表单:Android & 中的 Toast 通知IOS [英] Xamarin forms: Toast Notification in Android & IOS

问题描述

我正在使用 PCL 项目以 xamarin 形式创建一个应用程序.我想在两次回按时实现 Toast 通知，仅适用于 android 和 ios.对于 android 我试过 -

long doublePressInterval_ms = 300;日期时间 lastPressTime = DateTime.MinValue;DateTime pressTime = DateTime.Now;if ((pressTime - lastPressTime).TotalMilliseconds <= doublePressInterval_ms){if(Device.OS == TargetPlatform.Android){Java.Lang.JavaSystem.Exit(0);}}别的{Android.Widget.Toast.MakeText(this, string_name, ToastLength.Long).Show();}lastPressTime = 按下时间；返回假；

但它显示错误无法将页面转换为 Android 上下文.如何在我的 pcl 项目中获取 adnroid 上下文?

我尝试了

解决方案

在 Xamarin Android 中你可以像往常一样显示

Toast.MakeText(this,"toast message", ToastLength.Long).Show();

在 Xamarin iOS 中，您必须使用自定义设计的带有动画的 UIView 才能达到相同的效果

public void ShowToast(String message, UIView view){UIView 残留视图 = view.ViewWithTag(1989);如果(剩余视图！= null)残留视图.RemoveFromSuperview();var viewBack = new UIView(new CoreGraphics.CGRect(83, 0, 300, 100));viewBack.BackgroundColor = UIColor.Black;viewBack.Tag = 1989;UILabel lblMsg = new UILabel(new CoreGraphics.CGRect(0, 20, 300, 60));lblMsg.Lines = 2;lblMsg.Text = 消息；lblMsg.TextColor = UIColor.White;lblMsg.TextAlignment = UITextAlignment.Center;viewBack.Center = view.Center;viewBack.AddSubview(lblMsg);view.AddSubview(viewBack);转角(viewBack)；UIView.BeginAnimations("Toast");UIView.SetAnimationDuration(3.0f);viewBack.Alpha = 0.0f;UIView.CommitAnimations();}

Hi I am creating an app in xamarin forms using PCL project. I want to implement Toast notification on twice back press only for android and ios. For android I tried -

long doublePressInterval_ms = 300;
DateTime lastPressTime = DateTime.MinValue;
DateTime pressTime = DateTime.Now;

        if ((pressTime - lastPressTime).TotalMilliseconds <= doublePressInterval_ms)
        {
            if(Device.OS == TargetPlatform.Android)
            {

                Java.Lang.JavaSystem.Exit(0);
            }
        }
        else
        {

           Android.Widget.Toast.MakeText(this, string_name, ToastLength.Long).Show();
        }
        lastPressTime = pressTime;
        return false;

But it shows error Cannot convert Page to Android Context. How can I get adnroid context in my pcl project?

I tried Toast Notification Plugin for Xamarin but it says .Net version is incompatible.

解决方案

In Xamarin Android you can show as usual like

Toast.MakeText(this,"toast message", ToastLength.Long).Show();

In Xamarin iOS you have to use custom designed UIView with animation to achieve the same effect

public void ShowToast(String message, UIView view)
{
    UIView residualView = view.ViewWithTag(1989);
    if (residualView != null)
        residualView.RemoveFromSuperview();

    var viewBack = new UIView(new CoreGraphics.CGRect(83, 0, 300, 100));
    viewBack.BackgroundColor = UIColor.Black;
    viewBack.Tag = 1989;
    UILabel lblMsg = new UILabel(new CoreGraphics.CGRect(0, 20, 300, 60));
    lblMsg.Lines = 2;
    lblMsg.Text = message;
    lblMsg.TextColor = UIColor.White;
    lblMsg.TextAlignment = UITextAlignment.Center;
    viewBack.Center = view.Center;
    viewBack.AddSubview(lblMsg);
    view.AddSubview(viewBack);
    roundtheCorner(viewBack);
    UIView.BeginAnimations("Toast");
    UIView.SetAnimationDuration(3.0f);
    viewBack.Alpha = 0.0f;
    UIView.CommitAnimations();
}

这篇关于Xamarin 表单:Android & 中的 Toast 通知IOS的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！