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次のサンプルAndroid-Support/FragmentsはMvvmCrossで、AppBarとToolbarリソース定義をフラグメントに移動するために自分のアプリをリファクタリングしようとしています。コールでアクティビティを正常に動作させている間に、フラグメント上のSetSupportActionbarの呼び出しに問題が発生しています。ここでリファクタリングコードです：FragmentのSetSupportActionBarがSupportActionBarを設定していません
activity_main.axml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/main_coordinator_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<!-- Actual content of the screen -->
<FrameLayout
android:id="@+id/main_content_frame"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_centerInParent="true"
android:layout_below="@+id/toolbar"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
MainActivity.cs
using Android.App;
using Android.OS;
using Android.Content.PM;
using MvvmCross.Droid.Support.V7.AppCompat;
using Mobile.Core.ViewModels;
namespace Mobile.Droid.Activities
{
[Activity(
Label = "@string/applicationName",
Icon = "@drawable/ic_icon",
Theme = "@style/AppTheme.Default",
LaunchMode = LaunchMode.SingleTop,
ScreenOrientation = ScreenOrientation.Portrait,
Name = "droid.mobile.activities.MainActivity")]
public class MainActivity : MvxAppCompatActivity<MainViewModel>
{
...
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.activity_main);
ViewModel.ShowLists();
}
....
}
}
fragment_lists.axml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/list_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<android.support.design.widget.AppBarLayout
android:id="@+id/main_app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.ActionBar">
<android.support.v7.widget.Toolbar
android:id="@+id/main_tool_bar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.ToolBar"
app:layout_scrollFlags="scroll|enterAlways" />
</android.support.design.widget.AppBarLayout>
<MvvmCross.Droid.Support.V4.MvxSwipeRefreshLayout
android:id="@+id/listsRefresher"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
app:MvxBind="Refreshing IsLoading; RefreshCommand ReloadCommand">
<MvvmCross.Droid.Support.V7.RecyclerView.MvxRecyclerView
android:id="@+id/listsRecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
app:MvxItemTemplate="@layout/item_list"
app:MvxBind="ItemsSource Lists; ItemClick ShowListItemsCommand" />
</MvvmCross.Droid.Support.V4.MvxSwipeRefreshLayout>
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right"
android:layout_margin="@dimen/margin_medium"
android:src="@drawable/ic_add_white_24dp"
android:visibility="invisible"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
app:layout_anchor="@id/main_content_frame"
app:layout_anchorGravity="bottom|right|end" />
</RelativeLayout>
ListsFragment.cs
using Android.OS;
using Android.Views;
using MvvmCross.Droid.Support.V4;
using MvvmCross.Binding.Droid.BindingContext;
using Android.Runtime;
using List.Mobile.Droid.Common;
using MvvmCross.Binding.BindingContext;
using Android.Support.V4.View;
using Android.Widget;
using List.Mobile.Core.ViewModels;
using MvvmCross.Droid.Support.V7.RecyclerView;
using Android.Support.V7.Widget;
using MvvmCross.Droid.Views.Attributes;
namespace List.Mobile.Droid.Views
{
[MvxFragmentPresentation(typeof(MainViewModel), Resource.Id.main_content_frame, true)]
[Register("list.mobile.droid.views.ListsFragment")]
public class ListsFragment : BaseFragment<ListsViewModel>, ActionMode.ICallback
{
...
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
base.OnCreateView(inflater, container, savedInstanceState);
...
}
}
}
BaseFragment.cs
using MvvmCross.Droid.Support.V4;
using List.Mobile.Droid.Common;
using MvvmCross.Core.ViewModels;
using Android.OS;
using Android.Views;
using Android.Support.Design.Widget;
using Android.Support.V7.Widget;
using Android.Support.V7.App;
namespace List.Mobile.Droid.Views
{
public abstract class BaseFragment<T> : MvxFragment<T> where T : MvxViewModel
{
protected AppBarLayout AppBar { get; set; }
protected FloatingActionButton FAB { get; set; }
protected Toolbar Toolbar { get; set; }
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
var view = base.OnCreateView(inflater, container, savedInstanceState);
AppBar = Activity.FindViewById<AppBarLayout>(Resource.Id.main_app_bar);
FAB = Activity.FindViewById<FloatingActionButton>(Resource.Id.fab);
Toolbar = Activity.FindViewById<Toolbar>(Resource.Id.main_tool_bar);
AppCompatActivity parentActivity = ((AppCompatActivity)Activity);
parentActivity.SetSupportActionBar(Toolbar);
parentActivity.SupportActionBar.SetDisplayHomeAsUpEnabled(false);
parentActivity.SupportActionBar.SetHomeButtonEnabled(false);
return view;
}
}
}
は、問題はラインである：
parentActivity.SetSupportActionBar(Toolbar);
parentActivity.SupportActionBarはとNullReferenceExceptionで失敗にアクションバーと後続の呼び出しを設定していないようだと。何か案は？このことは、AppbarとToolbarがFragmentではなくActivityに定義されているときに機能することを忘れないでください。