所以我看了这个youtube（https://www.youtube.com/watch?v=TahxgjZTpSA&list=PLCuRg51-gw5VqYchUekCqxUS9hEZkDf6l&index=49）教程并使用了他网站上的示例代码（示例50：http://cforbeginners.com/XamarinProjects.html）。我运行了样本，出现了Hamburger to Arrow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。
我甚至进行了测试;我创建了一个新的解决方案，并将示例文件复制到新的解决方案和相同的结果，没有动画或图标。所以在这一点上，我认为是内部导致了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但没有一个能够工作：
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：
MainActivity：
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>
MainLayout：
<?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>
答案 0 :(得分：1)
您在SetDisplayHomeAsUpEnabled()上错过了ActionBar的来电。
SupportActionBar.SetDisplayHomeAsUpEnabled(true);