Xamarin中的错误膨胀类android.support.design.widget.Coordinator

Question

我收到一条错误消息，上面写着：

Android.Views.InflateException：‘二进制XML文件行#1:二进制XML文件行#2:错误充气类android.support.design.widget.Coordinator’

调试器在SetContentView(Resource.Layout.activity_main);上运行和中断。我目前正在使用VisualStudio16.3.0预览3，因为我对当前的版本有问题，在这个预览版中有Xamarin android错误修复。

当我从<include layout="@layout/include_main"/>中删除activity_main.axml时，我会得到一个错误：

System.NullReferenceException：“对象引用未设置为对象的实例。”

在SupportActionBar.Title = ""; in MainActivity.cs。

MainActivity.cs

using Android.App;
using Android.OS;
using Android.Support.V7.App;
using Android.Runtime;
using Android.Widget;
using System;
using Firebase.Database;
using Firebase;
using Android.Views;

namespace PaleteroGo
{
    [Activity(Label = "@string/app_name", Theme = "@style/PaleteroTheme", MainLauncher = false)]
    public class MainActivity : AppCompatActivity
    {
        FirebaseDatabase database;
        Android.Support.V7.Widget.Toolbar mainToolbar;
        Android.Support.V4.Widget.DrawerLayout drawerLayout;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.activity_main); //debugger breaks here
            ConnectControl();
        }

        void ConnectControl()
        {
            drawerLayout = (Android.Support.V4.Widget.DrawerLayout)FindViewById(Resource.Id.drawerLayout);
            mainToolbar = (Android.Support.V7.Widget.Toolbar)FindViewById(Resource.Id.mainToolbar);
            SetSupportActionBar(mainToolbar);
            SupportActionBar.Title = ""; //then breaks here
            Android.Support.V7.App.ActionBar actionBar = SupportActionBar;
            actionBar.SetHomeAsUpIndicator(Resource.Mipmap.ic_help_action);
            actionBar.SetDisplayHomeAsUpEnabled(true);
        }

        public override bool OnOptionsItemSelected(IMenuItem item)
        {
            switch (item.ItemId)
            {
                case Android.Resource.Id.Home:
                    drawerLayout.OpenDrawer((int)GravityFlags.Left);
                    return true;
                default:
                    return base.OnOptionsItemSelected(item);

            }
        }

        void Initializedatabase()
        {
            ...
        }

    }
}

activity_main.axml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/drawerLayout"
    android:fitsSystemWindows="true"
    >

    <LinearLayout
        android:orientation="vertical"
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        >

        <include
        layout="@layout/include_main"

        />

        </LinearLayout>

    <android.support.design.widget.NavigationView
        android:id="@+id/navView"
        android:layout_height="match_parent"
        android:layout_width="300dp"
        android:background="@color/paleteroWhite"
        android:layout_gravity="start"
        app:headerLayout="@layout/headerlayout"
        app:menu="@menu/navmenu"
        />

</android.support.v4.widget.DrawerLayout>

include_main.xml

<android.support.design.widget.Coordinator 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/rootView"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:layout_height="fill_parent"
        android:layout_width="fill_parent"
        android:background="@color/paleteroAsh"
        >   

        <android.support.v7.widget.Toolbar
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:minHeight="?android:attr/actionBarSize"
            android:id="@+id/mainToolbar"
        />

        </FrameLayout>

</android.support.design.widget.Coordinator>

Answer 1

试着像这样改变：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   android:orientation="vertical"
   android:layout_width="match_parent"
   android:layout_height="match_parent">
  <android.support.v7.widget.Toolbar
       android:minWidth="25dp"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:minHeight="?attr/actionBarSize"
       android:id="@+id/mainToolbar" />
  <android.support.v4.widget.DrawerLayout
       android:id="@+id/drawerLayout"
       android:layout_width="match_parent"
       android:layout_height="match_parent">
    <include
       layout="@layout/include_main"
       android:layout_width="match_parent"
       android:layout_height="match_parent" />

   <android.support.design.widget.NavigationView
       android:id="@+id/nav_view"
       android:layout_width="wrap_content"
       android:layout_height="match_parent"
       android:layout_gravity="start"
       app:headerLayout="@layout/headerlayout"
       app:menu="@menu/navmenu"
    />

   </android.support.v4.widget.DrawerLayout>
</LinearLayout>

include_main：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical">

        <FrameLayout
           android:id="@+id/fragmentContainer"
           android:layout_width="match_parent"
           android:layout_height="match_parent" />

</LinearLayout>