潜在的 Glide 错误 - 在 Android TV 上使用 Dpad 快速滚动时，RecyclerView 项目失去焦点
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【中文标题】潜在的 Glide 错误 - 在 Android TV 上使用 Dpad 快速滚动时，RecyclerView 项目失去焦点【英文标题】：Potential Glide bug - RecyclerView item lose focus when fast scrolled with Dpad on Android TV 【发布时间】：2019-08-05 01:31:59 【问题描述】：我正在尝试为 android TV 制作一个基本的相册应用程序。
在 glide 中使用 recyclerview。
问题： 当通过按下 dpad 向下按钮缓慢滚动时，recyclerview 项目会如预期准确地获得焦点。但是，当按住 dpad 向下按钮时，在快速滚动期间，recyclerview 项目很容易失去焦点，并且焦点会移动到 recyclerview 之外的任何可聚焦视图（在本例中为编辑文本），并且在手动将焦点移动到 recyclerview 内之前无法滚动再次。
尝试的补救措施： 1. 如果我完全禁用 Glide 的图像加载（在 onBindViewHolder() 内部），焦点永远不会丢失，无论滚动速度有多快，它总是按预期工作。此补救措施没有用，因为需要查看图像。 2. 如果快速滚动受到覆盖 Activity.onKeyDown 方法的限制，以忽略所有键输入，除非自上次 keydown 以来已过去 300 毫秒。同样，这感觉非常hacky，并且完全禁用快速滚动是绝对要求。
请注意，我已经阅读了有关 *** 的相关 QA。这表明这是 Android 支持库 LayoutManager 代码中的一个错误，这里不是这种情况，因为没有滑行它可以正常工作。
如何重现：创建一个类似 ListFragment 的片段（下面的代码），然后按住 Down Dpad 按钮尝试快速滚动，您会看到 editText 不断获得焦点。
代码： ListFragment.java
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewCompat;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import com.bumptech.glide.Glide;
import com.bumptech.glide.RequestManager;
import com.bumptech.glide.request.RequestOptions;
import java.util.Random;
public class ListFragment extends Fragment
RequestManager glide;
public ListFragment()
// Required empty public constructor
private RecyclerView recyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager layoutManager;
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_list, container, false);
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState)
super.onActivityCreated(savedInstanceState);
recyclerView = getActivity().findViewById(R.id.my_recycler_view);
glide = Glide.with(this);
layoutManager = new GridLayoutManager(getActivity(),8);
mAdapter = new MyAdapter();
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(mAdapter);
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>
private final String[] imageUrls = "https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/5c2baa1821c67c1430401c65/1546365481213/20181208_0034pp2+810b2.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/5c2baa218a922d1c5eb370c5/1546365483758/20181208_0115pp+810b.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/5c2ba92340ec9ab2ea3f0f73/1546365229886/20181215_0135pp+810b.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/5c2ba8880e2e72e38d92a482/1546365075745/20180914_0189+810b.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/5c2ba885f950b760dd6800a7/1546365086762/20180914_0168pp+810.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/5c2ba9b1032be425c6948ca2/1546365375849/20180818_0014pp+810b.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/5c2baa184ae2379d323c4187/1546365481929/20181208_0065pp+810b2.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/57a256b9e4fcb574ae612941/1470258368357/20160801_0045.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/57a255d1e4fcb574ae61196f/1470256635728/20160717_0391.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/57a25695e4fcb574ae61273c/1470258368265/20160801_0040.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/57a256dbe4fcb574ae612b71/1470258369606/20160801_0108+pp+810+bw.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/57a257088419c29f345a7500/1470258369115/20160801_0108+pp+810.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/5c2ba8e4f950b760dd6804fe/1546365168544/20181101_0067pp+810b.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/5c2ba83270a6adae0b3b6395/1546364992480/20181205_0164pp+810.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/5c2ba8e4575d1f0c318f3727/1546365171139/20181101_0050pp+810b.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/57a2543dd1758e06589e07f1/1470256544677/20160402_0075+810b.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/57a253fad1758e06589e040f/1470256190368/20160402_0039+810b.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/57a255fae4fcb574ae611e08/1470258367476/20160717_0444b.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/57a2573be4fcb574ae613197/1470258370169/20160801_0123+810.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/57a257708419c29f345a7ba7/1470258369404/20160801_0272+810.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/57a25db19f74561d105005de/1470258684806/20160402_0046+810+nik2.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/55076c74e4b07b36ea118be0/1470413754677/20141222_0049.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/57a256688419c29f345a6b17/1470258368620/20160721_0097+pp2.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/57a255c9d1758e06589e1f5e/1470258367695/20160721_0012+ppb.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/56c21ac72b8dde5db5879498/1546363401197/20151107_0094+pp+57c.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/56c20eb662cd945cd5b485f5/1546363401197/20151024_1026+pp+810c.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/53558987e4b007661e339aa7/1470413754809/20140419_0430_pp1+5x7b.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/585db7f3893fc0e1cdfe1bbb/1482536961660/20160507_0069b+810.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/585db8019de4bb91b69d5e37/1482537012182/20160904_0012+810.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/585db8346a496340ce2b8f6e/1482537056393/20160904_0043+pp+810l.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/585db846d482e9c87e69aa3c/1482537056630/20160904_0071+pp+810b.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd4f2a/585db860d2b857ddbd63c824/1482537071373/20160904_0119+pp+810b.jpg","https://static1.squarespace.com/static/51d6d61de4b03f5ac28c861a/55076abee4b038dc7dbd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private final RequestOptions options = new RequestOptions().centerCrop();
private final Random random = new Random();
private final Handler handler = new Handler();
public class ViewHolder extends RecyclerView.ViewHolder
public ImageView icon;
public View layout;
ViewHolder(View v)
super(v);
layout = v;
icon = v.findViewById(R.id.icon);
@Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType)
LayoutInflater inflater = LayoutInflater.from(
parent.getContext());
View v =
inflater.inflate(R.layout.item_recycler_view, parent, false);
MyAdapter.ViewHolder vh = new MyAdapter.ViewHolder(v);
return vh;
@Override
public void onBindViewHolder(final MyAdapter.ViewHolder holder, final int position)
final String name = imageUrls[random.nextInt(imageUrls.length - 1)];
//Commenting this out resolves focus loss
glide.load(name).into(holder.icon);
@Override
public void onViewRecycled(@NonNull ViewHolder holder)
super.onViewRecycled(holder);
glide.clear(holder.icon);
// Return the size of your dataset (invoked by the layout manager)
@Override
public int getItemCount()
return Integer.MAX_VALUE;
布局： item_recycler_view.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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_
android:layout_
android:foreground="@drawable/fg_selectable"
android:clickable="true"
android:focusable="true"
android:focusableInTouchMode="false"
android:descendantFocusability="blocksDescendants"
android:layout_margin="2dp"
>
<ImageView
android:id="@+id/icon"
android:layout_
android:layout_
app:layout_constraintDimensionRatio="27:41"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:background="@color/colorPrimaryDark"
tools:src="@tools:sample/avatars"
/>
</android.support.constraint.ConstraintLayout>
fragment_list.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".ListFragment"
android:orientation="horizontal"
>
<EditText
android:id="@+id/editText"
android:text="test"
android:layout_
android:layout_
android:nextFocusDown="@id/editText"
/>
<android.support.v7.widget.RecyclerView
android:id="@+id/my_recycler_view"
android:layout_
android:layout_
/>
</LinearLayout>
【问题讨论】：
你解决了吗？我几乎在同一条船上。即使我在 CardPresenter 中使用 Glide，我也无法“压倒”Leanback 的 ListRow，但如果我真的快速滚动 RecycleView，我可能会失去焦点。 这里有同样的问题。我注意到的一件事是，一旦 Glide 缓存了所有图像，焦点就不会再丢失了。因此，一种潜在的解决方法是预加载和缓存所有图像。 这里有同样的问题。你找到解决方法了吗？我没有尝试使用 Picasso 来看看发生了什么......我认为更多的是 layoutmanager 或 recyclerview 错误，而不是 Glide 问题。 我也遇到了同样的问题，你找到解决办法了吗？我注意到它不仅适用于 Glide，而且适用于 Picasso。当图像没有被缓存并且从 URL 下载时，这也是一个问题（即使没有 Picasso/Glide，也只是使用从 URL 到位图的常规下载然后显示它） 【参考方案1】：为什么在 onViewRecycled 中需要 glide.clear()？我的猜测是，它与快速滚动期间频繁的滑行加载和清除有关。 Glide 可能会有些困惑。另外，为什么不 Leanback Library 和 GridFragment？根据我的经验，它适用于 Glide 和快速滚动。
【讨论】：
感谢您的回复。我已经删除了 glide.clear() 但结果仍然相同。我没有使用leanback，因为我还想支持手机和平板电脑。以上是关于潜在的 Glide 错误 - 在 Android TV 上使用 Dpad 快速滚动时，RecyclerView 项目失去焦点的主要内容，如果未能解决你的问题，请参考以下文章
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