使用Android中的Firebase在RecyclerView上获取onClickListener

Question

我已在我的活动中使用 Firebase RecyclerAdapter实施 RecyclerView ，并希望实现 onClickListener ，尽管我已尝试实现此目的但我想我的代码中有些东西是不对的，请帮我找出错误。我已经搜索了另一个问题，但没有得到理解，也无法找到解决问题的方法。

我正在使用Android Studio

firebase适配器类文件：

public class HomePage extends AppCompatActivity {

 @Override
    public void onStart() {
        super.onStart();
        FirebaseUser currentUser = mAuth.getCurrentUser();
        if (currentUser == null) {
            sentToStart();
        }

    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.setwebViewPost(model.getWebViewPost());
        }
    };
    mrecyclerView.setAdapter(firebaseRecyclerAdapter);

}


public static class postViewHolder extends RecyclerViewPager.ViewHolder {
    View mView;

    public postViewHolder(View itemView) {
        super(itemView);
        mView = itemView;
        mView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mClickListener.onItemClick(v, getAdapterPosition());
            }
        });
    }

    private postViewHolder.ClickListener mClickListener;

    public interface ClickListener {
        public void onItemClick(View view, int position);
    }

    public void setOnClickListener(postViewHolder.ClickListener clickListener) {
        mClickListener = clickListener;
    }

    public void setwebViewPost(String webViewPost) {
        WebView webView = (WebView) mView.findViewById(R.id.webView_news);
        webView.loadUrl(webViewPost);
    }

}

@Override
public postViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    postViewHolder viewHolder = super.onCreateViewHolder(parent, viewType);
    viewHolder.setOnClickListener(new postViewHolder().ClickListener() {
        @Override
        public void onItemClick (View view,int position){
            Toast.makeText(this, "Item clicked at " + position, Toast.LENGTH_SHORT).show();
        }

    });
    return viewHolder;
}

Answer 1

在onBindViewHolder中移动onClickListener。

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    holder.itemView.setOnClickListener(new postViewHolder().ClickListener() {
        @Override
        public void onItemClick (View view,int position){
            Toast.makeText(this, "Item clicked at " + position, Toast.LENGTH_SHORT).show();
        }

    });
}

修改

删除界面，因为它是多余的。您将值从viewholder传递给onCreateViewHolder，这是不必要的。而是处理视图内部的单击。检查更新的课程。

public class HomePage extends AppCompatActivity {

@Override
public void onStart() {
    super.onStart();
    FirebaseUser currentUser = mAuth.getCurrentUser();
    if (currentUser == null) {
        sentToStart();
    }

    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.setwebViewPost(model.getWebViewPost());
        }
    };
    mrecyclerView.setAdapter(firebaseRecyclerAdapter);

}

public static class postViewHolder extends RecyclerViewPager.ViewHolder {
    View mView;

    public postViewHolder(View itemView) {
        super(itemView);
        itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                //Show the webViewPost Here
            }
        });
    }

    public void setwebViewPost(String webViewPost) {
        WebView webView = (WebView) mView.findViewById(R.id.webView_news);
        webView.loadUrl(webViewPost);
    }

}

@Override
public postViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    postViewHolder viewHolder = super.onCreateViewHolder(parent, viewType);
    return viewHolder;
  }
}

Answer 2

请参阅我的方法，该方法取自Google示例+ GoogleIO youtube会话：

使用：

  

onCreateViewHolder（ViewGroup parent，int viewType）

newsAdapter = new FirebaseRecyclerAdapter<ModelNews, NewsItemHolder>(
                ModelNews.class,
                R.layout.item_news,
                NewsItemHolder.class,
                FirebaseDatabase.getInstance()
                        .getReference(FIREBASE_NEWS)
                        .orderByChild(FIREBASE_ORDER_BY_FIELD)
                        .limitToFirst(20)) {

            @Override
            public NewsItemHolder onCreateViewHolder(ViewGroup parent, int viewType) {
                View view = LayoutInflater.from(parent.getContext()).inflate(viewType, parent, false);
                final NewsItemHolder newsItemHolder = new NewsItemHolder(view);

                newsItemHolder.holder.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        int pos = newsItemHolder.getAdapterPosition();
                        if (pos != RecyclerView.NO_POSITION) {
                            ModelNews clicked = newsAdapter.getItem(pos);
                            if (clicked.getIsExternal() && !hasConnection) {
                                showSnackbar(R.string.news_with_wifi);
                                return;
                            }
                            goToDetails(clicked.getID(), clicked.getIsExternal());
                        }
                    }
                });

                return newsItemHolder;
            }

            @Override
            public void populateViewHolder(
                    final NewsItemHolder view,
                    ModelNews data,
                    final int position) {

                // Set news title
                view.titleView.setText(data.getTitle());

                // hide OR show wifi icon
                view.needWifiIcon(data.getIsExternal());

                // Set news image
                mImageLoader.loadImage(data.getThumbUrl(), view.thumbView, true);

                // Set news description
                view.descView.setText(data.getContent());
            }

            @Override
            public void onDataChanged() {
                if (newsProgessBar.getVisibility() != View.GONE) {
                    newsProgessBar.setVisibility(GONE);
                }
            }
        };