如何使用 Youtube API 在 RecyclerView 中加载 Youtube 缩略图
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【中文标题】如何使用 Youtube API 在 RecyclerView 中加载 Youtube 缩略图【英文标题】:How to load Youtube thumbnails in a RecyclerView using Youtube API 【发布时间】:2016-03-26 02:20:59 【问题描述】:我正在尝试在 RecyclerView 中加载 Youtube 视频缩略图。我遇到了一些问题。
这是我在适配器中所做的:
public static class ItemViewHolder extends RecyclerView.ViewHolder
private YouTubeThumbnailView thumb;
public Post post;
public ItemViewHolder(View v)
thumb = (YouTubeThumbnailView) v.findViewById(R.id.youtube_thumbnail);
@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position)
if (holder instanceof ItemViewHolder)
((ItemViewHolder) holder).thumb.initialize(YOUTUPEKEY, new YouTubeThumbnailView.OnInitializedListener()
@Override
public void onInitializationSuccess(YouTubeThumbnailView youTubeThumbnailView, YouTubeThumbnailLoader youTubeThumbnailLoader)
youTubeThumbnailLoader.setVideo(VIDEOID);
@Override
public void onInitializationFailure(YouTubeThumbnailView youTubeThumbnailView, YouTubeInitializationResult youTubeInitializationResult)
);
它工作正常,但我不这样做是正确的。当我在另一个活动中使用相同的适配器时,我收到此错误:
Activity com.example.yasser.version6.Mespublications has leaked ServiceConnection com.google.android.youtube.player.internal.r$e@4252bcb8 that was originally bound here
加载缩略图需要时间,有时在滑动时会在它们之间混合。
我添加了一个释放所有 Youtube 加载器的功能:
public void ReleaseLoaders()
for (YouTubeThumbnailLoader loader : loaders.values())
loader.release();
我从 Activity Onstop() 调用这个函数:
@Override
public void onStop()
super.onStop();
mAdapter.ReleaseLoaders();
它在一段时间内运行良好,但有时会崩溃。
【问题讨论】:
你检查过this SO ticket吗?您似乎遇到了同样的问题 - 内存泄漏问题,而不是 RecyclerView,似乎您已经处理了。 错误来自 Recyclerview 适配器 如何初始化适配器? 【参考方案1】:在onBindViewHolder
中,您试图一次又一次地初始化相同的YoutubeThumbnailView
,相反,您可以在onCreateViewHolder
中创建视图时对其进行一次初始化。通过将视频 ID 作为标签设置为 YoutubeThumbnailView
,您可以防止混合(或)错误加载缩略图。
适配器。
private class ThumbnailAdapter extends RecyclerView.Adapter
private final int UNINITIALIZED = 1;
private final int INITIALIZING = 2;
private final int INITIALIZED = 3;
private int blackColor = Color.parseColor("#FF000000");
private int transparentColor = Color.parseColor("#00000000");
public class VideoViewHolder extends RecyclerView.ViewHolder
public YouTubeThumbnailView ytThubnailView = null;
public ImageView ivYtLogo = null;
public TextView tvTitle = null;
public VideoViewHolder(View itemView)
super(itemView);
ytThubnailView = (YouTubeThumbnailView) itemView.findViewById(R.id.yt_thumbnail);
ivYtLogo = (ImageView) itemView.findViewById(R.id.iv_yt_logo);
tvTitle = (TextView) itemView.findViewById(R.id.tv_title);
initialize();
public void initialize()
ivYtLogo.setBackgroundColor(blackColor);
ytThubnailView.setTag(R.id.initialize, INITIALIZING);
ytThubnailView.setTag(R.id.thumbnailloader, null);
ytThubnailView.setTag(R.id.videoid, "");
ytThubnailView.initialize(API_KEY, new YouTubeThumbnailView.OnInitializedListener()
@Override
public void onInitializationSuccess(YouTubeThumbnailView youTubeThumbnailView, YouTubeThumbnailLoader youTubeThumbnailLoader)
ytThubnailView.setTag(R.id.initialize, INITIALIZED);
ytThubnailView.setTag(R.id.thumbnailloader, youTubeThumbnailLoader);
youTubeThumbnailLoader.setOnThumbnailLoadedListener(new YouTubeThumbnailLoader.OnThumbnailLoadedListener()
@Override
public void onThumbnailLoaded(YouTubeThumbnailView youTubeThumbnailView, String loadedVideoId)
String currentVideoId = (String) ytThubnailView.getTag(R.id.videoid);
if(currentVideoId.equals(loadedVideoId))
ivYtLogo.setBackgroundColor(transparentColor);
else
ivYtLogo.setBackgroundColor(blackColor);
@Override
public void onThumbnailError(YouTubeThumbnailView youTubeThumbnailView, YouTubeThumbnailLoader.ErrorReason errorReason)
ivYtLogo.setBackgroundColor(blackColor);
);
String videoId = (String) ytThubnailView.getTag(R.id.videoid);
if(videoId != null && !videoId.isEmpty())
youTubeThumbnailLoader.setVideo(videoId);
@Override
public void onInitializationFailure(YouTubeThumbnailView youTubeThumbnailView, YouTubeInitializationResult youTubeInitializationResult)
ytThubnailView.setTag(R.id.initialize, UNINITIALIZED);
ivYtLogo.setBackgroundColor(blackColor);
);
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
View view = getLayoutInflater().inflate(R.layout.row_video_item, parent, false);
VideoViewHolder videoViewHolder = new VideoViewHolder(view);
return videoViewHolder;
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position)
final Entities e = entities.get(position);
final VideoViewHolder videoViewHolder = (VideoViewHolder) holder;
videoViewHolder.tvTitle.setText(e.name);
videoViewHolder.ivYtLogo.setVisibility(View.VISIBLE);
videoViewHolder.ytThubnailView.setTag(R.id.videoid, e.id);
videoViewHolder.ivYtLogo.setBackgroundColor(blackColor);
int state = (int) videoViewHolder.ytThubnailView.getTag(R.id.initialize);
if(state == UNINITIALIZED)
videoViewHolder.initialize();
else if(state == INITIALIZED)
YouTubeThumbnailLoader loader = (YouTubeThumbnailLoader) videoViewHolder.ytThubnailView.getTag(R.id.thumbnailloader);
loader.setVideo(e.id);
@Override
public int getItemCount()
return entities.size();
每一行使用的布局是。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_
android:layout_>
<RelativeLayout
android:layout_
android:layout_>
<com.google.android.youtube.player.YouTubeThumbnailView
android:id="@+id/yt_thumbnail"
android:layout_
android:layout_ />
<ImageView
android:id="@+id/iv_yt_logo"
android:layout_
android:layout_
android:scaleType="center"
android:src="@mipmap/youtube_play"
android:background="#00000000"
android:layout_centerInParent="true"/>
</RelativeLayout>
<TextView
android:id="@+id/tv_title"
android:layout_
android:layout_
android:textColor="#FF000000"
android:textSize="16sp"
android:text="Title"/>
<View
android:id="@+id/seperator"
android:layout_
android:layout_
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"
android:background="#FF642108"/>
</LinearLayout>
tags.xml。
位置:src/main/res/values/tags.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<item type="id" name="initialize" />
<item type="id" name="videoid"/>
<item type="id" name="thumbnailloader"/>
</resources>
【讨论】:
感谢您的回复,但我已经尝试过了,缩略图仍然混合! 我在我的应用程序中使用它。它工作正常。缩略图不会混淆。【参考方案2】:你可以试试这个吗?它不使用 API,但速度很快。
使用 Picasso 从此 URL 将图像加载到回收站视图中:
https://img.youtube.com/vi/"这里是你的视频ID"/default.jpg
-- 编辑--
经过一些研究和实验:
要获得默认的全尺寸缩略图,请执行此操作而不是 default.jpg
https://img.youtube.com/vi/"这里是你的视频ID"/0.jpg
这里是链接:http://www.reelseo.com/youtube-thumbnail-image/
编辑 2:
刚刚在 SO 中发现有人已经用这个快速简单的解决方案给出了像我这样的答案,并且有更多的解释和选项可供您选择。
How do I get a YouTube video thumbnail from the YouTube API?
最终编辑:
这是工作代码。我最近用 api 制作了一个应用程序,所以我发现了你收到错误的原因。这是因为您没有正确释放加载程序。
您可以通过两种方式释放 loader/loaders。
第一
(首选,您将在几秒钟内了解原因) 您可能希望在图像加载到视图中之后释放它,并且有一个侦听器,它称为 OnThumbNailLoadedListener。那就是我发布它的地方(如果你注意下面的代码)。这意味着您不必再处理这个实例了。加载缩略图后,您就完成了。
第二
由于 getView() 一直被调用,因此您必须释放 YouTubeThumbnailLoader 的新实例。这意味着您必须将所有这些存储在一个 ArrayList 中。当活动为 onStop() 时,您只需执行高级 for 循环并在所有这些循环中调用 release;
现在您可能明白为什么首选第一种方式了。而且我知道你做了第二个选项,所以只要让你知道第一个选项总是可以保证工作(至少在我的情况下)。我在 Activity 中使用了 YouTubeSupportFragment,它运行良好。没有任何问题。您绝对可以使第二个选项起作用,但我认为您必须处理很多特殊情况。
final YouTubeThumbnailView youTubeThumbnailView = (YouTubeThumbnailView) convertView.findViewById(R.id.show_episode_thumbnail);
youTubeThumbnailView.initialize(DeveloperKey.DEVELOPER_KEY, new YouTubeThumbnailView.OnInitializedListener()
@Override
public void onInitializationSuccess(YouTubeThumbnailView youTubeThumbnailView, final YouTubeThumbnailLoader youTubeThumbnailLoader)
youTubeThumbnailLoader.setVideo(videoId);
youTubeThumbnailLoader.setOnThumbnailLoadedListener(new YouTubeThumbnailLoader.OnThumbnailLoadedListener()
@Override
public void onThumbnailLoaded(YouTubeThumbnailView youTubeThumbnailView, String s)
youTubeThumbnailLoader.release();
@Override
public void onThumbnailError(YouTubeThumbnailView youTubeThumbnailView, YouTubeThumbnailLoader.ErrorReason errorReason)
);
@Override
public void onInitializationFailure(YouTubeThumbnailView youTubeThumbnailView, YouTubeInitializationResult youTubeInitializationResult)
);
【讨论】:
刚刚对我的回答做了很好的编辑。我建议你看看。 非常感谢老兄..!!【参考方案3】:public class VideoAdapter extends RecyclerView.Adapter<VideoAdapter.VideoHolder>
private List<VideoPojo> listvideo;
private VideoPojo videoPojo;
private Context mContext;
private boolean readyForLoadingYoutubeThumbnail = true;
String KEY = "AIzaSyA5kyaLgS7MKxS19uHf2CUsIOmDkv92DGU";
public VideoAdapter(Context context, List<VideoPojo> listvideo)
this.listvideo = listvideo;
this.mContext = context;
videoPojo = new VideoPojo();
@Override
public VideoAdapter.VideoHolder onCreateViewHolder(ViewGroup parent, int viewType)
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.video_layout, parent, false);
return new VideoHolder(view);
@Override
public void onBindViewHolder(final VideoAdapter.VideoHolder holder, final int position)
holder.murl.setText(listvideo.get(position).getVideoUrl());
final String url = listvideo.get(position).getVideoUrl();
Log.d(TAG, "readyForLoadingYoutubeThumbnail" + readyForLoadingYoutubeThumbnail);
if (readyForLoadingYoutubeThumbnail)
Log.d(TAG, "initializing for youtube thumbnail view...");
readyForLoadingYoutubeThumbnail = false;
holder.youTubeThumbnailView.initialize(KEY, new YouTubeThumbnailView.OnInitializedListener()
@Override
public void onInitializationSuccess(final YouTubeThumbnailView youTubeThumbnailView, final YouTubeThumbnailLoader youTubeThumbnailLoader)
youTubeThumbnailLoader.setVideo(url);
youTubeThumbnailLoader.setOnThumbnailLoadedListener(new YouTubeThumbnailLoader.OnThumbnailLoadedListener()
@Override
public void onThumbnailLoaded(YouTubeThumbnailView childYouTubeThumbnailView, String s)
holder.loding.setVisibility(View.GONE);
youTubeThumbnailLoader.release(); // spy ga memory lick
@Override
public void onThumbnailError(YouTubeThumbnailView youTubeThumbnailView, YouTubeThumbnailLoader.ErrorReason errorReason)
youTubeThumbnailLoader.release(); // spy ga memory lick
);
readyForLoadingYoutubeThumbnail = true;
@Override
public void onInitializationFailure(YouTubeThumbnailView youTubeThumbnailView, YouTubeInitializationResult youTubeInitializationResult)
//do nohing.. ada error, tambahin method ini jalan, error-nya lupa...
readyForLoadingYoutubeThumbnail = true;
);
holder.mdelate.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
deleteVideoAlertDialog(listvideo.get(holder.getAdapterPosition()).getId(), holder.getAdapterPosition());
);
@Override
public int getItemCount()
// Log.v(VideoAdapter.class.getSimpleName(), "" + listvideo.size());
return listvideo.size();
public class VideoHolder extends RecyclerView.ViewHolder
YouTubeThumbnailView youTubeThumbnailView;
protected FrameLayout playButton;
TextView murl, mdelate;
ImageView loding;
public VideoHolder(View itemView)
super(itemView);
mdelate = itemView.findViewById(R.id.mdelate);
murl = itemView.findViewById(R.id.murl);
playButton = itemView.findViewById(R.id.btnYoutube_player);
youTubeThumbnailView = itemView.findViewById(R.id.youtube_thumbnail);
loding = itemView.findViewById(R.id.loding);
playButton.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
int position = getAdapterPosition();
String url = listvideo.get(position).getVideoUrl();
Toast.makeText(mContext, url, Toast.LENGTH_SHORT).show();
Intent intent = YouTubeStandalonePlayer.createVideoIntent((Activity) mContext,
KEY, url, 100, false, true);
mContext.startActivity(intent);
);
private void deleteVideoAlertDialog(final int row_id, final int adapterPosition)
final AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("Delete");
// Setting Dialog Message
alertDialog.setMessage("Are you sure you want to delete this video");
alertDialog.setPositiveButton("Yes", new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int which)
if (SQLiteHelper.deleteUser(mContext, row_id))
listvideo.remove(adapterPosition);
notifyItemRemoved(adapterPosition);
notifyItemRangeChanged(adapterPosition, listvideo.size());
else
Toast.makeText(mContext, "internal issue ", Toast.LENGTH_SHORT).show();
);
// Setting Negative "NO" Button
alertDialog.setNegativeButton("No", new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int which)
// Write your code here to invoke NO event
dialog.cancel();
);
// Showing Alert Message
alertDialog.show();
public boolean addNewVideo(String Url, Context context)
videoPojo.setVideoUrl(Url);
SQLiteHelper sqLiteHelper = new SQLiteHelper(context);
if (sqLiteHelper.addNewVideo(context, videoPojo))
listvideo.add(videoPojo);
notifyDataSetChanged();
Toast.makeText(context, "video Saved", Toast.LENGTH_SHORT).show();
return true;
return false;
【讨论】:
【参考方案4】:从此网址获取高质量图片:
https://img.youtube.com/vi/<VIDEO_ID_HERE>/maxresdefault.jpg
然后使用 picasso 或 glide 库加载它。
对于此视频“https://www.youtube.com/watch?v=BEScHJrjsmU”,VIDEO_ID 为“BEScHJrjsmU”
【讨论】:
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