Question

我有一个链接到tablayout的ViewPager。我使用FragmentStatePagerAdapter来填充我的适配器，并将它与SetupWithViewPager链接到tabLayout。

如果我向我的viewpager添加500个片段，则需要2秒才能显示。

如果我删除了TabLayout的链接并将其删除，则没有延迟，所有内容都会直接显示。

是否有东西可以缓存未显示的项目tabLayout ???

有人有想法吗？

编辑：

[MvxFragment(typeof(MainViewModel), Resource.Id.content_frame, true)]
[Register("mvvmcrosslearning.droid.fragments.DateFragment")]
public class DateFragment : BaseFragment<DateViewModel>
{
    protected override int FragmentId => Resource.Layout.fragment_date;

    public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        var view = base.OnCreateView(inflater, container, savedInstanceState);
        var viewPager = view.FindViewById<ViewPager>(Resource.Id.viewpager);
        var tabLayout = view.FindViewById<TabLayout>(Resource.Id.tabs);

        new Thread(() =>
        {
            if (viewPager == null) return;

            var fragments = new List<MvxCachingFragmentStatePagerAdapter.FragmentInfo>();
            for (var i = 0; i < 500; i++)
                fragments.Add(new MvxCachingFragmentStatePagerAdapter.FragmentInfo(
                    $"Ceci est du text : {i}",
                    typeof(RecyclerViewFragment),
                    typeof(RecyclerViewModel),
                    new Device() { Date = $"index from frag: {i}" }
                ));

            Activity.RunOnUiThread(() => viewPager.Adapter =
                new MvxCachingFragmentStatePagerAdapter(Activity, ChildFragmentManager, fragments));

            viewPager.OffscreenPageLimit = 1;

            tabLayout.SetupWithViewPager(viewPager);
        }).Start();

        return view;
    }
}

和视图

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
                                                 xmlns:local="http://schemas.android.com/apk/res-auto"
                                                 xmlns:app="http://schemas.android.com/apk/res-auto"
                                                 android:id="@+id/main_content"
                                                 android:layout_width="match_parent"
                                                 android:layout_height="match_parent">
    <android.support.design.widget.AppBarLayout android:layout_width="match_parent"
                                                android:layout_height="wrap_content"
                                                android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabMode="scrollable"
            />
    </android.support.design.widget.AppBarLayout>
    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        local:layout_behavior="@string/appbar_scrolling_view_behavior" >
    </android.support.v4.view.ViewPager>
</android.support.design.widget.CoordinatorLayout>

片段中有一个简单的按钮。

Answer 1

这似乎是一个已知的错误，正在这里进行跟踪：https://issuetracker.google.com/issues/37053935

TabLayout性能问题

1 个答案: