如何从渲染器在 ToolbarItem 的中心添加自定义视图 [英] How to add custom view in Center of ToolbarItem from Renderer

问题描述

我正在从 NavigationPageRenderer for android 在 ToolbarItem 的中心添加自定义视图.但它似乎不起作用.在下面查看我的代码

公共类 CustomNavigationPageRenderer : NavigationPageRenderer{公共覆盖无效 OnViewAdded(Android.Views.View child){base.OnViewAdded(child);var lastPageElement?.Navigation?.NavigationStack?.Last().ToString();if (lastPage == "ParentDashboardPage"){LayoutInflater li = LayoutInflater.From(Context);Android.Views.View customView = li.Inflate(Resource.Layout.customActionbar, null);var _toolbar = FindViewById(Resource.Id.toolbar);_toolbar.RemoveAllViews();//_toolbar.AddView(text,new Toolbar.LayoutParams(GravityFlags.Center));即使这不起作用_toolbar.AddView(customView);}}}

customActionbar.axml 文件如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="wrap_content"android:layout_height="wrap_content"><文本视图android:layout_width="wrap_content"机器人:文本=仪表板"android:textColor="@color/white"机器人:layout_gravity="中心"android:id="@+id/tvActionBarTitle"android:layout_height="wrap_content"机器人:重力=中心"机器人:layout_centerVertical =真"机器人:layout_centerInParent =真"android:textSize="17dp"/><图像视图机器人:layout_gravity =正确"android:layout_width="30dp"android:layout_height="wrap_content"android:id="@+id/item2"android:src="@drawable/bell"android:layout_alignParentRight="true"/></RelativeLayout>

输出截图如下:

解决方案

如果你使用的是基于

此外，如果您需要应用一些依赖于平台的特殊调整，您可以使用 OnPlatform.

---

为什么我选择样式的那些属性?

尽可能接近原生默认文本标题.相关问题:

定义 Shell.TitleView，同时保留 shell 中标签的标题文本，但似乎以不同的字体显示>

I am adding custom view in Center of ToolbarItem from NavigationPageRenderer for android. But it doesn't seems to be working. See my code below

public class CustomNavigationPageRenderer : NavigationPageRenderer
{
   public override void OnViewAdded(Android.Views.View child)
    {
        base.OnViewAdded(child);
        var lastPageElement?.Navigation?.NavigationStack?.Last().ToString();

        if (lastPage == "ParentDashboardPage")
        {
            LayoutInflater li = LayoutInflater.From(Context);
            Android.Views.View customView = li.Inflate(Resource.Layout.customActionbar, null);
            var _toolbar = FindViewById<Android.Support.V7.Widget.Toolbar>(Resource.Id.toolbar);
            _toolbar.RemoveAllViews();
            //_toolbar.AddView(text,new Toolbar.LayoutParams(GravityFlags.Center)); Even this not working
            _toolbar.AddView(customView);
        }
    }
}

customActionbar.axml file below:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <TextView
        android:layout_width="wrap_content"
        android:text=" Dashboard"
        android:textColor="@color/white"
        android:layout_gravity="center"
        android:id="@+id/tvActionBarTitle"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_centerVertical="true"
        android:layout_centerInParent="true"
        android:textSize="17dp" />
    <ImageView
        android:layout_gravity="right"
        android:layout_width="30dp"
        android:layout_height="wrap_content"
        android:id="@+id/item2"
        android:src="@drawable/bell"
        android:layout_alignParentRight="true" />
</RelativeLayout>

Output screensshot below:

解决方案

If you are using a Xamarin.Forms app based on Shell then you can easily achieve this using Shell.TitleView without the need of a custom renderer, define your title content, bind it or even style it as you like.

Inside your ContentPage:

<Shell.TitleView>
    <StackLayout Orientation="Horizontal" Spacing="0">
        <Label Text="Dashboard"
               Opacity="1"
               FontAttributes="Bold"
               FontSize="20"
               TextColor="White"
               HorizontalOptions="CenterAndExpand"
               HorizontalTextAlignment="Center"
               VerticalTextAlignment="Center"/>

        <ImageButton Source="Bell.png"
                     VerticalOptions="CenterAndExpand"
                     HorizontalOptions="End"
                     BackgroundColor="transparent"/>
    </StackLayout>
</Shell.TitleView>

Also if you need to apply some special adjustments platform-dependent you can use OnPlatform.

---

Why I choosed those attributes of the style?

To be as close as possible to native default text title. Related question:

Defining Shell.TitleView while preserving the title text of tabs in shell, but seems showing in a different font

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