我开发了一个应用程序,其中有两个帖子
- 使用毕加索的图片发布
- 使用 Youtube Api 发布视频。
我已经通过使用 RecyclerView 和 Firebase recyclerAdapter 实现了两者,但问题是我不知道如何区分这两种 View ,如果我使用视频 View 使用 Youtube Api 它附加了 ImageView 并且还复制 到recyclerView 中的所有项目,然后所有项目中只有一个视频播放。我想要的是,如果我想显示图像,那么该项目只会获取图像,如果我想显示视频,那么 reyclerView 项目只会获取视频而不会重复。喜欢 Instagram。我搜索了很多论坛,但没有从他们那里得到任何帮助。请帮忙。我使用 Firebase 作为我的数据库,而 ViewHolders 是根据那个。
图像和视频帖子的类文件:
FirebaseRecyclerAdapter <post, postViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<post, postViewHolder>(
post.class,
R.layout.post_row_recycle_home,
postViewHolder.class,
mDatabaseReference
) {
@Override
protected void populateViewHolder(postViewHolder viewHolder, post model, int position) {
viewHolder.setimage(getApplicationContext(), model.getImage());
viewHolder.setYoutube(model.getYoutube());
}
};
mrecyclerView.setAdapter(firebaseRecyclerAdapter);
持有人:
public static class postViewHolder extends RecyclerViewPager.ViewHolder{
View mView;
public postViewHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setYoutube(final String youtube){
final YouTubePlayerView youPlay = (YouTubePlayerView) mView.findViewById(R.id.youtuber);
youPlay.initialize("SOME KEY",
new YouTubePlayer.OnInitializedListener() {
@Override
public void onInitializationSuccess(YouTubePlayer.Provider provider,
YouTubePlayer youTubePlayer, boolean b) {
youTubePlayer.cueVideo(youtube);
}
@Override
public void onInitializationFailure(YouTubePlayer.Provider provider,
YouTubeInitializationResult youTubeInitializationResult) {
}
});
}
public void setimage(final Context ctx, final String image){
final ImageView post_image = (ImageView)mView.findViewById(R.id.post_image);
Picasso.with(ctx).load(image)
.networkPolicy(NetworkPolicy.OFFLINE).into(post_image, new Callback() {
@Override
public void onSuccess() {
}
@Override
public void onError() {
Picasso.with(ctx).load(image).into(post_image);
}
});
}
}
示例截图:
最佳答案
您可以决定使用适配器 getItemViewType
方法显示哪种类型的 View 。在 firebaseRecyclerAdapter
中添加以下内容:
private static final int TYPE_YOUTUBE = 1111;
private static final int TYPE_IMAGE = 2222;
@Override
public int getItemViewType(int position) {
//note: classes should start with uppercase
Post model = getItem(position);
if (model.isYoutube()) { //note: you'll have to define this method
return TYPE_YOUTUBE;
} else {
return TYPE_IMAGE;
}
}
然后在 onCreateViewHolder
中检查要创建的类型:
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
RecyclerView.ViewHolder holder;
switch (viewType) {
case TYPE_YOUTUBE:
//note: save an inflater when you construct the adapter
return new YtViewHolder(inflater.inflate(R.layout.item_youtube, parent, false));
case TYPE_IMAGE:
return new ImgViewHolder(inflater.inflate(R.layout.item_image, parent, false));
}
}
分离您的 VH 模型:
public abstract class PostViewHolder extends RecyclerView.ViewHolder { //note: extends changed
public abstract void bind(final String input){
}
public static class YtViewHolder extends PostViewHolder { //note: extends changed
private YouTubePlayerView mView;
public YtViewHolder(View itemView) {
super(itemView);
mView = (YouTubePlayerView) itemView.findViewById(R.id.youtuber);
}
public void bind(final String youtube){
mView.initialize("SOME KEY",
new YouTubePlayer.OnInitializedListener() {
@Override
public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer youTubePlayer, boolean b) {
youTubePlayer.cueVideo(youtube);
}
@Override
public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult youTubeInitializationResult) {
}
});
}
}
public static class ImgViewHolder extends PostViewHolder {
private ImageView mView;
public ImageView(View itemView) {
super(itemView);
mView = (ImageView) itemView.findViewById(R.id.post_image);
}
public void bind(final String image){
Picasso.with(mView.getContext()).load(image).networkPolicy(NetworkPolicy.OFFLINE).into(mView, new Callback() {
@Override
public void onSuccess() {
}
@Override
public void onError() {
Picasso.with(ctx).load(image).into(mView);
}
});
}
}
然后您的填充方法可以简化如下:
@Override
protected void populateViewHolder(PostViewHolder viewHolder, post model, int position) {
viewHolder.bind(model.isYoutube()? model.getYoutube() : model.getImage());
}
不同的项目:
then there is only one video playing in all items
这有点令人担忧。如果我理解正确的话,列表中的每一项都具有相同的图像和视频。这可能意味着您要将相同的模型返回到每个位置。确保如果您实现 getItem,您会为每个位置返回不同的项目(默认情况下,Firebase 适配器会这样做)。还要确保 model.getYoutube
等不返回静态数据。
关于android - 在 Android 中使用 Firebase 在单个 RecyclerView 中获取两个不同的 View ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46216540/