无法激活JNI句柄

Question

我在启动我的应用程序时遇到了问题，它说： System.NotSupportedException：无法将Java类型'md571f7fe98ab2dde9bbbc9832d751ab67e / MainActivity'的Java类型的JNI句柄0x7fe5716ca0（key_handle 0x5c7a272）激活为托管类型'MyFriends.MainActivity'。

plz帮助我解决此问题。 我使用的是JDK版本1.8.0.212

这是我在第一页中的XML编码

<RelativeLayout 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="match_parent"
android:layout_height="match_parent">
<ListView
    android:minWidth="25px"
    android:minHeight="25px"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/lvFriends" />

这是我的活动

 [Activity(Label = "@string/app_name", Theme = "@style/AppTheme", MainLauncher = true)]
public class MainActivity :Activity
{
    FriendRepository db = new FriendRepository();

    private ListView lvFriends;
    protected override void OnCreate(Bundle Bundle)
    {
        base.OnCreate(Bundle);
        // Set our view from the "main" layout resource
        SetContentView(Resource.Layout.activity_main);

       lvFriends = FindViewById<ListView>(Resource.Id.lvFriends);
        RestList();

        lvFriends.ItemClick += LvFriends_ItemClick;


    }

    private void LvFriends_ItemClick(object sender, AdapterView.ItemClickEventArgs e)
    {
        int friendId = (int)e.Id;
        Android.Content.Intent editIntent = new Intent(this, typeof(DetailActivity));
        editIntent.PutExtra("FriendID", friendId);
        StartActivity(editIntent);
    }

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

    public override bool OnOptionsItemSelected(IMenuItem item)
    {

        switch (item.ItemId)
        {
            case Resource.Id.actionNew:
                {
                    StartActivity(typeof(DetailActivity));
                    break;
                }
            case Resource.Id.actionRefresh:
                {
                    RestList();
                    break;
                }
        }
        return base.OnOptionsItemSelected(item);
    }

    protected override void OnResume()
    {
        RestList();

        base.OnResume();
    }
    void RestList()
    {
        lvFriends.Adapter = new FriendAdapter(this, db.GetAllFriend());
    }
}