抽屉上没有汉堡到箭头的动画或图标

Question

所以我看了这个在他的网站上找到的 youtube (https://www.youtube.com/watch?v=TahxgjZTpSA&list=PLCuRg51-gw5VqYchUekCqxUS9hEZkDf6l&index=49) tutorial and used his sample code (sample 50: http://cforbeginners.com/XamarinProjects.html)。我运行示例中出现了汉堡到箭头的动画，但是当我尝试在我的解决方案项目中实现它时，没有动画或图标。

我什至进行了测试；我创建了一个新的解决方案并将示例文件直接复制到新的解决方案中，结果相同，没有动画或图标。所以在这一点上，我认为是内部原因导致没有汉堡包到箭头动画或图标的问题。

我试过这个解决方案，none 有效：

ActionBarDrawerToggle.syncState Doesn't show the hamburger icon?

Appcompatv7 - v21 Navigation drawer not showing hamburger icon

Navigation Drawer with Burger to back arrow animation on Lollipop

示例中的文件：

主要活动：

using System;

using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using SupportToolbar = Android.Support.V7.Widget.Toolbar;
using Android.Support.V7.App;
using Android.Support.V4.Widget;
using System.Collections.Generic;

namespace test.Droid
{
    [Activity (Label = "test.Droid", Icon = "@drawable/icon", MainLauncher = true, Theme="@style/MyTheme")]
    public class MainActivity : ActionBarActivity
    {
        private SupportToolbar mToolbar;
        private MyActionBarDrawerToggle mDrawerToggle;
        private DrawerLayout mDrawerLayout;
        private ListView mLeftDrawer;
        private ListView mRightDrawer;
        private ArrayAdapter mLeftAdapter;
        private ArrayAdapter mRightAdapter;
        private List<string> mLeftDataSet;
        private List<string> mRightDataSet;

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

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

            mToolbar = FindViewById<SupportToolbar>(Resource.Id.toolbar);
            mDrawerLayout = FindViewById<DrawerLayout>(Resource.Id.drawer_layout);
            mLeftDrawer = FindViewById<ListView>(Resource.Id.left_drawer);
            mRightDrawer = FindViewById<ListView>(Resource.Id.right_drawer);

            mLeftDrawer.Tag = 0;
            mRightDrawer.Tag = 1;

            SetSupportActionBar(mToolbar);

            mLeftDataSet = new List<string>();
            mLeftDataSet.Add ("Left Item 1");
            mLeftDataSet.Add ("Left Item 2");
            mLeftAdapter = new ArrayAdapter<string>(this, Android.Resource.Layout.SimpleListItem1, mLeftDataSet);
            mLeftDrawer.Adapter = mLeftAdapter;

            mRightDataSet = new List<string>();
            mRightDataSet.Add ("Right Item 1");
            mRightDataSet.Add ("Right Item 2");
            mRightAdapter = new ArrayAdapter<string>(this, Android.Resource.Layout.SimpleListItem1, mRightDataSet);
            mRightDrawer.Adapter = mRightAdapter;

            mDrawerToggle = new MyActionBarDrawerToggle(
                this,                           //Host Activity
                mDrawerLayout,                  //DrawerLayout
                Resource.String.openDrawer,     //Opened Message
                Resource.String.closeDrawer     //Closed Message
            );

            mDrawerLayout.SetDrawerListener(mDrawerToggle);
            SupportActionBar.SetHomeButtonEnabled(true);
            SupportActionBar.SetDisplayShowTitleEnabled(true);
            mDrawerToggle.SyncState();

            if (bundle != null)
            {
                if (bundle.GetString("DrawerState") == "Opened")
                {
                    SupportActionBar.SetTitle(Resource.String.openDrawer);
                }

                else
                {
                    SupportActionBar.SetTitle(Resource.String.closeDrawer);
                }
            }

            else
            {
                //This is the first the time the activity is ran
                SupportActionBar.SetTitle(Resource.String.closeDrawer);
            }
        }

        public override bool OnOptionsItemSelected (IMenuItem item)
        {       
            switch (item.ItemId)
            {

            case Android.Resource.Id.Home:
                //The hamburger icon was clicked which means the drawer toggle will handle the event
                //all we need to do is ensure the right drawer is closed so the don't overlap
                mDrawerLayout.CloseDrawer (mRightDrawer);
                mDrawerToggle.OnOptionsItemSelected(item);
                return true;

            case Resource.Id.action_refresh:
                //Refresh
                return true;

            case Resource.Id.action_help:
                if (mDrawerLayout.IsDrawerOpen(mRightDrawer))
                {
                    //Right Drawer is already open, close it
                    mDrawerLayout.CloseDrawer(mRightDrawer);
                }

                else
                {
                    //Right Drawer is closed, open it and just in case close left drawer
                    mDrawerLayout.OpenDrawer (mRightDrawer);
                    mDrawerLayout.CloseDrawer (mLeftDrawer);
                }

                return true;

            default:
                return base.OnOptionsItemSelected (item);
            }
        }

        public override bool OnCreateOptionsMenu (IMenu menu)
        {
            MenuInflater.Inflate (Resource.Menu.action_menu, menu);
            return base.OnCreateOptionsMenu (menu);
        }

        protected override void OnSaveInstanceState (Bundle outState)
        {
            if (mDrawerLayout.IsDrawerOpen((int)GravityFlags.Left))
            {
                outState.PutString("DrawerState", "Opened");
            }

            else
            {
                outState.PutString("DrawerState", "Closed");
            }

            base.OnSaveInstanceState (outState);
        }

        protected override void OnPostCreate (Bundle savedInstanceState)
        {
            base.OnPostCreate (savedInstanceState);
            mDrawerToggle.SyncState();
        }

        public override void OnConfigurationChanged (Android.Content.Res.Configuration newConfig)
        {
            base.OnConfigurationChanged (newConfig);
            mDrawerToggle.OnConfigurationChanged(newConfig);
        }
    }
}

MyActionBarDrawerToggle:

using System;
using SupportActionBarDrawerToggle = Android.Support.V7.App.ActionBarDrawerToggle;
using Android.Support.V7.App;
using Android.Support.V4.Widget;

namespace test.Droid
{
    public class MyActionBarDrawerToggle : SupportActionBarDrawerToggle
    {
        private ActionBarActivity mHostActivity;
        private int mOpenedResource;
        private int mClosedResource;

        public MyActionBarDrawerToggle (ActionBarActivity host, DrawerLayout drawerLayout, int openedResource, int closedResource) 
            : base(host, drawerLayout, openedResource, closedResource)
        {
            mHostActivity = host;
            mOpenedResource = openedResource;
            mClosedResource = closedResource;
        }

        public override void OnDrawerOpened (Android.Views.View drawerView)
        {   
            int drawerType = (int)drawerView.Tag;

            if (drawerType == 0)
            {
                base.OnDrawerOpened (drawerView);
                mHostActivity.SupportActionBar.SetTitle(mOpenedResource);
            }
        }

        public override void OnDrawerClosed (Android.Views.View drawerView)
        {
            int drawerType = (int)drawerView.Tag;

            if (drawerType == 0)
            {
                base.OnDrawerClosed (drawerView);
                mHostActivity.SupportActionBar.SetTitle(mClosedResource);
            }               
        }

        public override void OnDrawerSlide (Android.Views.View drawerView, float slideOffset)
        {
            int drawerType = (int)drawerView.Tag;

            if (drawerType == 0)
            {
                base.OnDrawerSlide (drawerView, slideOffset);
            }
        }
    }
}

样式：

<?xml version="1.0" encoding="UTF-8" ?>
<resources>

    <style name="MyTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <item name="colorPrimary">#2196F3</item>
        <item name="drawerArrowStyle">@style/MyDrawerArrowStyle</item>
    </style>

    <style name="MyDrawerArrowStyle" parent="Widget.AppCompat.DrawerArrowToggle">
        <item name="color">#F5F5F5</item>
        <item name="spinBars">true</item>
    </style>
</resources>

主布局：

<?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="fill_parent"
    android:layout_height="fill_parent">
    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:minHeight="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Dark" />
    <android.support.v4.widget.DrawerLayout
        android:id="@+id/drawer_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    <!-- The Main Content View -->
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Support V7 Action Bar Drawer Toggle"
                android:layout_centerInParent="true" />
        </RelativeLayout>
    <!-- The Left Navigation Drawer -->
        <ListView
            android:id="@+id/left_drawer"
            android:layout_width="240dp"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            android:choiceMode="singleChoice"
            android:divider="#818181"
            android:dividerHeight="1dp"
            android:background="#E3F2FD" />
        <ListView
            android:id="@+id/right_drawer"
            android:layout_width="240dp"
            android:layout_height="match_parent"
            android:layout_gravity="right"
            android:choiceMode="singleChoice"
            android:divider="#E2E2E2"
            android:dividerHeight="1dp"
            android:background="#9E9E9E" />
    </android.support.v4.widget.DrawerLayout>
</LinearLayout>

菜单：

<?xml version="1.0" encoding="UTF-8" ?>

<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:myapp="http://schemas.android.com/apk/res-auto">

    <item android:id="@+id/action_refresh"
        android:icon="@drawable/ic_action_refresh"
        android:title="Refresh"
        myapp:showAsAction="always" />

    <item android:id="@+id/action_help"
        android:icon="@drawable/ic_action_help"
        android:title="Help"
        myapp:showAsAction="always"/>

</menu>

Answer 1

您错过了 ActionBar 上对 SetDisplayHomeAsUpEnabled() 的呼叫。

SupportActionBar.SetDisplayHomeAsUpEnabled(true);

抽屉上没有汉堡到箭头的动画或图标

No Hamburger to Arrow animation or icon showing on Drawer

android

xamarin-studio

navigation-drawer

drawerlayout

drawertoggle