Xamarin.Android 中的浮动操作按钮无法激活 JNI 句柄异常

Question

我正在尝试使用 xamarin component 在我的应用程序中集成 FloatingActionButton。在布局 inflation 上它抛出异常 "Could not activate JNI Handle 0xffb8b288 (key_handle 0x3ee746ea) of Java type 'com/refractored/fab/FloatingActionButton' as managed type 'com.refractored.fab.FloatingActionButton'."

布局文件

    <?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             xmlns:fab="http://schemas.android.com/apk/res-auto"
             android:layout_width="match_parent"
             android:layout_height="match_parent"> 
    <ListView
            android:id="@android:id/list"
            android:layout_width="match_parent"
            android:layout_height="match_parent" /> 
    <com.refractored.fab.FloatingActionButton
            android:id="@+id/fab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|right"
            android:layout_margin="16dp"
            android:src="@drawable/ic_edit"
            fab:fab_colorNormal="@color/primary"
            fab:fab_colorPressed="@color/primary_pressed"
            fab:fab_colorRipple="@color/ripple" />
</FrameLayout>

Activity代码：

using System;
using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS; 
using Android.Support.V4.App; 
using ActionBar =  Android.Support.V7.App.ActionBar;
using Android.Text;
using com.refractored.fab;  
using Android.Support.V7.App; 

namespace SampleActionBar
{
    [Activity (Label = "SampleActionBar", MainLauncher = true, Icon = "@mipmap/icon")]
    public class MainActivity : ActionBarActivity, ActionBar.ITabListener
    { 
        protected override void OnCreate (Bundle savedInstanceState)
        {
            base.OnCreate (savedInstanceState);
            InitActionBar (); 
        } 
        private void InitActionBar()
        {
            if (SupportActionBar == null)
                return;

            var actionBar = SupportActionBar;
            actionBar.NavigationMode = (int)ActionBarNavigationMode.Tabs;

            var tab1 = actionBar.NewTab();
            tab1.SetTabListener(this);
            tab1.SetText("ListView");
            actionBar.AddTab(tab1); 
        }
        public void OnTabReselected(ActionBar.Tab tab, Android.Support.V4.App.FragmentTransaction ft)
        {
        } 
        public void OnTabSelected(ActionBar.Tab tab, Android.Support.V4.App.FragmentTransaction ft)
        {
            switch (tab.Text)
            {
            case "ListView":
                ft.Replace(Android.Resource.Id.Content, new ListViewFragment());
                break; 
            }
        } 
        public void OnTabUnselected(ActionBar.Tab tab, Android.Support.V4.App.FragmentTransaction ft)
        { 
        } 
    } 
    public class ListViewFragment:Android.Support.V4.App.Fragment, IScrollDirectorListener, AbsListView.IOnScrollListener
    {
        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            var root = inflater.Inflate(Resource.Layout.Main, container, false);

            var list = root.FindViewById<ListView>(Android.Resource.Id.List);
            var adapter = new ListViewAdapter(Activity, Resources.GetStringArray(Resource.Array.countries));
            list.Adapter = adapter;

            var fab = root.FindViewById<FloatingActionButton>(Resource.Id.fab);
            //fab.AttachToListView(list, this, this);
            fab.Click += (sender, args) =>
            {
                Toast.MakeText(Activity, "FAB Clicked!", ToastLength.Short).Show();
            };
            return root;
        }
        public void OnScrollDown()
        { 
        }

        public void OnScrollUp()
        { 
        }

        public void OnScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
        { 
        }

        public void OnScrollStateChanged(AbsListView view, ScrollState scrollState)
        { 
        }
    }
}

目标 sdk 版本为 23，最低版本为 16。
更新 android 支持 V4,V7 AppCompat(23.1.1.0) 和 refractored.fab(1.4.0) 包。
来自 xamarin 组件的示例代码工作正常，没有任何问题
此异常的原因可能是什么？任何 suggestion/hints 都表示赞赏。
谢谢

Answer 1

该组件已被弃用，转而使用 FloatingActionButton 的支持库版本。您可以删除该组件并确保包含来自 Nuget (23.1.1.0) 的最新设计库包 Nuget Link。那么你应该可以做到以下几点。

<android.support.design.widget.FloatingActionButton
  ...
  android:id="@+id/fab" />

在你的代码中加上这个 using Android.Support.Design.Widget;

Xamarin.Android 中的浮动操作按钮无法激活 JNI 句柄异常

Could not activate JNI Handle exception with Floating action button in Xamarin.Android

android

xamarin.android

xamarin

material-design

floating-action-button