如何从onclick监听器打开Xamarian Droid Activity中的Xamrian Forms页面

Question

Helo我正在为我的应用程序添加一个辅助功能，当用户按住主页按钮时，Android活动会打开一个用户可以点击的卡片，然后打开有问题的xamarin表单页面，例如当数学卡被点击MathPage xamarin表单页面打开继承我的android布局代码：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_tools_home_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingTop="10dp"
        android:id="@+id/whole"
        tools:context="${relativePackage}.${activityClass}"
        tools:layout_editor_absoluteY="0dp"
        tools:layout_editor_absoluteX="0dp">
        <LinearLayout
            android:layout_width="wrap_content"
            android:id="@+id/scroll"
            android:layout_height="wrap_content">
            <android.support.v7.widget.CardView
                android:id="@+id/one"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:cardBackgroundColor="@color/cardsbg"
                app:cardElevation="3dp"
                android:clickable="false"
                tools:layout_conversion_absoluteX="16dp"
                tools:layout_conversion_absoluteY="8dp"
                tools:layout_conversion_absoluteWidth="379dp"
                tools:layout_conversion_absoluteHeight="540dp">
                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">
                    <android.support.v7.widget.CardView
                        android:id="@+id/webcard"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginBottom="4dp"
                        android:layout_marginRight="8dp"
                        android:layout_marginLeft="8dp"
                        android:layout_marginTop="8dp"
                        android:foreground="?android:attr/selectableItemBackground"
                        app:cardBackgroundColor="@color/card_background"
                        app:cardElevation="3dp"
                        android:clickable="true"
                        android:onClick="web">
                        <RelativeLayout
                            android:layout_width="match_parent"
                            android:layout_height="match_parent">
                            <ImageView
                                android:id="@+id/webicon"
                                android:layout_width="68dp"
                                android:layout_height="68dp"
                                android:layout_centerVertical="true"
                                android:padding="5dp"
                                android:src="@drawable/web" />
                            <TextView
                                android:id="@+id/web"
                                android:layout_width="wrap_content"
                                android:layout_height="wrap_content"
                                android:layout_centerVertical="true"
                                android:layout_toRightOf="@id/webicon"
                                android:text="Internet"
                                android:paddingLeft="8dp"
                                android:textColor="@color/cardText"
                                android:textSize="20sp" />
                        </RelativeLayout>
                    </android.support.v7.widget.CardView>
                    <android.support.v7.widget.CardView
                        android:id="@+id/mailcard"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:foreground="?android:attr/selectableItemBackground"
                        android:layout_marginBottom="4dp"
                        android:layout_marginRight="8dp"
                        android:layout_marginLeft="8dp"
                        android:layout_marginTop="4dp"
                        android:layout_below="@+id/webcard"
                        app:cardBackgroundColor="@color/card_background"
                        app:cardElevation="3dp"
                        android:clickable="true"
                        android:onClick="email">
                        <RelativeLayout
                            android:layout_width="match_parent"
                            android:layout_height="match_parent">
                            <ImageView
                                android:id="@+id/emailicon"
                                android:layout_width="68dp"
                                android:layout_height="68dp"
                                android:layout_centerVertical="true"
                                android:padding="5dp"
                                android:src="@drawable/email" />
                            <TextView
                                android:id="@+id/email"
                                android:layout_width="wrap_content"
                                android:layout_height="wrap_content"
                                android:paddingLeft="8dp"
                                android:layout_centerVertical="true"
                                android:layout_toRightOf="@id/emailicon"
                                android:text="Email"
                                android:textColor="@color/cardText"
                                android:textSize="20sp" />
                        </RelativeLayout>
                    </android.support.v7.widget.CardView>
                    <android.support.v7.widget.CardView
                        android:id="@+id/mathcard"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:foreground="?android:attr/selectableItemBackground"
                        android:layout_marginBottom="4dp"
                        android:layout_marginRight="8dp"
                        android:layout_marginLeft="8dp"
                        android:layout_marginTop="4dp"
                        android:layout_below="@+id/mailcard"
                        app:cardBackgroundColor="@color/card_background"
                        app:cardElevation="3dp"
                        android:clickable="true"
                        android:onClick="math">
                        <RelativeLayout
                            android:layout_width="match_parent"
                            android:layout_height="match_parent">
                            <ImageView
                                android:id="@+id/musicicon"
                                android:layout_width="68dp"
                                android:layout_height="68dp"
                                android:layout_centerVertical="true"
                                android:padding="5dp"
                                android:src="@drawable/math" />
                            <TextView
                                android:id="@+id/music"
                                android:layout_width="wrap_content"
                                android:layout_height="wrap_content"
                                android:layout_centerVertical="true"
                                android:layout_toRightOf="@id/musicicon"
                                android:text="Math"
                                android:paddingLeft="8dp"
                                android:textColor="@color/cardText"
                                android:textSize="20sp" />
                        </RelativeLayout>
                    </android.support.v7.widget.CardView>
                    <android.support.v7.widget.CardView
                        android:id="@+id/scicard"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:foreground="?android:attr/selectableItemBackground"
                        android:layout_marginBottom="8dp"
                        android:layout_marginRight="8dp"
                        android:layout_marginLeft="8dp"
                        android:layout_marginTop="4dp"
                        android:layout_below="@+id/mathcard"
                        app:cardBackgroundColor="@color/card_background"
                        app:cardElevation="3dp"
                        android:clickable="true"
                        android:onClick="science">
                        <RelativeLayout
                            android:layout_width="match_parent"
                            android:layout_height="match_parent">
                            <ImageView
                                android:id="@+id/playicon"
                                android:layout_width="68dp"
                                android:layout_height="68dp"
                                android:layout_centerVertical="true"
                                android:padding="8dp"
                                android:src="@drawable/sci" />
                            <TextView
                                android:id="@+id/play"
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content"
                                android:layout_centerVertical="true"
                                android:paddingLeft="8dp"
                                android:layout_toRightOf="@+id/playicon"
                                android:text="Science"
                                android:textColor="@color/cardText"
                                android:textSize="20sp" />
                        </RelativeLayout>
                    </android.support.v7.widget.CardView>
                    <android.support.v7.widget.CardView
                        android:id="@+id/englishcard"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:foreground="?android:attr/selectableItemBackground"
                        android:layout_marginBottom="8dp"
                        android:layout_marginRight="8dp"
                        android:layout_marginLeft="8dp"
                        android:layout_marginTop="4dp"
                        android:layout_below="@+id/scicard"
                        app:cardBackgroundColor="@color/card_background"
                        app:cardElevation="3dp"
                        android:clickable="true"
                        android:onClick="english">
                        <RelativeLayout
                            android:layout_width="match_parent"
                            android:layout_height="match_parent">
                            <ImageView
                                android:id="@+id/playicon"
                                android:layout_width="68dp"
                                android:layout_height="68dp"
                                android:layout_centerVertical="true"
                                android:padding="8dp"
                                android:src="@drawable/handwrittin" />
                            <TextView
                                android:id="@+id/play"
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content"
                                android:layout_centerVertical="true"
                                android:paddingLeft="8dp"
                                android:layout_toRightOf="@+id/playicon"
                                android:text="Handwriting"
                                android:textColor="@color/cardText"
                                android:textSize="20sp" />
                        </RelativeLayout>
                    </android.support.v7.widget.CardView>
                    <android.support.v7.widget.CardView
                        android:id="@+id/flashcard"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:foreground="?android:attr/selectableItemBackground"
                        android:layout_marginBottom="8dp"
                        android:layout_marginRight="8dp"
                        android:layout_marginLeft="8dp"
                        android:layout_marginTop="4dp"
                        android:layout_below="@+id/englishcard"
                        app:cardBackgroundColor="@color/card_background"
                        app:cardElevation="3dp"
                        android:clickable="true"
                        android:onClick="flashcard">
                        <RelativeLayout
                            android:layout_width="match_parent"
                            android:layout_height="match_parent">
                            <ImageView
                                android:id="@+id/playicon"
                                android:layout_width="68dp"
                                android:layout_height="68dp"
                                android:layout_centerVertical="true"
                                android:padding="8dp"
                                android:src="@drawable/flashcards" />
                            <TextView
                                android:id="@+id/play"
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content"
                                android:layout_centerVertical="true"
                                android:paddingLeft="8dp"
                                android:layout_toRightOf="@+id/playicon"
                                android:text="Flashcards"
                                android:textColor="@color/cardText"
                                android:textSize="20sp" />
                        </RelativeLayout>
                    </android.support.v7.widget.CardView>
                    <RelativeLayout
                        android:id="@+id/bttom"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_below="@id/flashcard"
                        android:paddingTop="8dp"
                        android:layout_marginBottom="8dp">
                        <Button
                            android:id="@+id/button_2"
                            android:onClick="cam"
                            android:foreground="?android:attr/selectableItemBackground"
                            android:layout_alignParentLeft="true"
                            android:layout_marginLeft="50dp"
                            android:layout_width="50dp"
                            android:layout_height="50dp"
                            android:background="@drawable/settings" />
                        <Button
                            android:id="@+id/button_1"
                            android:onClick="settings"
                            android:foreground="?android:attr/selectableItemBackground"
                            android:layout_alignParentRight="true"
                            android:layout_marginRight="50dp"
                            android:layout_width="50dp"
                            android:layout_height="50dp"
                            android:background="@drawable/settings" />
                    </RelativeLayout>
                </RelativeLayout>
            </android.support.v7.widget.CardView>
        </LinearLayout>
        <Button
            android:layout_width="72dp"
            android:layout_height="72dp"
            android:id="@+id/button_4"
            android:onClick="now"
            android:layout_marginTop="-42dp"
            android:layout_below="@+id/scroll"
            android:foreground="?android:attr/selectableItemBackground"
            android:clipToPadding="false"
            android:layout_centerHorizontal="true"
            android:background="@drawable/books" />
    </RelativeLayout>
</RelativeLayout>

我的代码背后是：

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

using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Xamarin.Forms.Platform.Android;

namespace AppName.Droid
{
[Activity(LaunchMode = LaunchMode.SingleInstance, Theme = "@style/Theme.Transparent")]
    [IntentFilter(new[] { Intent.ActionAssist }, Categories = new[] { Intent.CategoryDefault })]    
    public class ToolBelt : FormsApplicationActivity
    {

        Button mathbutton;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.ToolBelt);

        }


        //Code That Opens The Math  Part!

        [Java.Interop.Export("math")] // The value found in android:onClick attribute.
        public void btnOneClick4(View v) // Does not need to match value in above attribute.
        {

            //code to open the MathPage Forms Page Goes here
        }

        //Code That Opens The Internet  App!

        [Java.Interop.Export("web")] // The value found in android:onClick attribute.
        public void btnOneClick8(View v) // Does not need to match value in above attribute.
        {
            var uri = Android.Net.Uri.Parse("http://www.google.com");
            var intent = new Intent(Intent.ActionView, uri);
            StartActivity(intent);
        }



        //Code That Opens The Gmail App!

        [Java.Interop.Export("email")] // The value found in android:onClick attribute.
        public void btnOneClick3(View v) // Does not need to match value in above attribute.
        {
            var intent = PackageManager.GetLaunchIntentForPackage("com.google.android.gm");
            StartActivity(intent);
        }





    }
}

任何帮助都会很棒！

提前致谢：）

Answer 1

这是一个简单的例子......

基于非表单的页面选择Activity：

用户点按一个按钮，我们创建一个Intent来打开主要表单＆＃39;基于Activity并使用＆＃34;页面添加字符串Extra＆＃34;那个用户选择了。

[Activity(Label = "PageSelectionActivity", Theme = "@style/MyTheme",  Name = "com.sushhangover.openpage.PageSelectionActivity")]
public class PageSelectionActivity : AppCompatActivity
{
    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        SetContentView(Resource.Layout.PageSelection);
        Button button = FindViewById<Button>(Resource.Id.myButton);
        button.Click += delegate 
        {
            var intent = new Intent(ApplicationContext, typeof(MainActivity));
            intent.PutExtra("page", "StackOverflowPage");
            StartActivity(intent);          
        };
    }
}

修改您的MainActivity以获取Extra（如果有）并将其传递给App .actor：

[Activity(Label = "OpenPage.Droid", Icon = "@drawable/icon", Theme = "@style/MyTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
    protected override void OnCreate(Bundle savedInstanceState)
    {
        TabLayoutResource = Resource.Layout.Tabbar;
        ToolbarResource = Resource.Layout.Toolbar;

        base.OnCreate(savedInstanceState);

        global::Xamarin.Forms.Forms.Init(this, savedInstanceState);

        var page = Intent.GetStringExtra("page");
        LoadApplication(new App(page));
    }
}

修改应用程序默认.actor以接受参数并对其进行操作：

public class App : Application
{
    public App(string pageName = "SomeDefaultMainApplicationEntryPage")
    {
        switch (pageName)
        {
            case "StackOverflowPage":
                MainPage = new NavigationPage(new StackOverflowPage);
                break;
            default:
                MainPage = new NavigationPage(new SomeDefaultMainApplicationEntryPage);
                break;
        }
    }
}

测试

您可以使用adb打开页面选择活动以启动它：

adb shell am start -n com.sushhangover.openpage/.PageSelectionActivity

注意：您需要处理Xamarin.Form页面生命周期，因为它可能会变得混乱，具体取决于您的ToolBelt活动是否已在用户已有您的活动时打开应用程序打开，它处于某些活动的中间，你通过重新启动应用程序来破坏他们的工作....