RecycleView不显示数据 [英] RecycleView do not displaying the data
本文介绍了RecycleView不显示数据的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个非常受欢迎的问题-为什么数据没有显示在RecycleView中.
I have very popular question - why the data not showing in the RecycleView.
那是我的适配器:
public class CommentsAdapter extends RecyclerView.Adapter<CommentsAdapter.ViewHolder> {
private static final String TAG = "CommentsAdapter";
public ImageView mThumbView;
private List<PostComment> postCommentList;
public CommentsAdapter(List<PostComment> postCommentList) {
this.postCommentList = postCommentList;
}
@Override
public CommentsAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.post_comment_item, parent, false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(CommentsAdapter.ViewHolder holder, int position) {
PostComment record = postCommentList.get(position);
holder.mAuthorTextView.setText(record.getUser().getFull_name());
holder.mDateTextView.setText(record.getCreated_at());
holder.mTextTextView.setText(record.getText());
}
@Override
public int getItemCount() {
Log.i(TAG + " comments size", Integer.toString(postCommentList.size()));
return postCommentList.size();
}
public void addItems(List<PostComment> postCommentList) {
this.postCommentList.addAll(postCommentList);
}
public class ViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView mAuthorTextView;
public TextView mDateTextView;
public TextView mTextTextView;
public ViewHolder(View v) {
super(v);
mAuthorTextView = (TextView) itemView.findViewById(R.id.comment_author);
mDateTextView = (TextView) itemView.findViewById(R.id.comment_date);
mTextTextView = (TextView) itemView.findViewById(R.id.comment_text);
}
}
}
那是我的观点:
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/container"
....>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"
android:paddingBottom="16dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="16dp">
<ImageView
android:id="@+id/comment_image"
android:layout_width="50dp"
android:layout_height="50dp"
android:scaleType="centerInside"
android:src="@drawable/cat"/>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/middleLayout"
android:layout_toRightOf="@+id/comment_image"
android:layout_marginTop="8dp">
<TextView
android:id="@+id/comment_author"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:singleLine="true"
android:text="Dark Plastic"
android:textColor="?attr/colorPrimary"
android:textSize="14dp" />
<TextView
android:id="@+id/comment_date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="8dp"
android:layout_toRightOf="@+id/comment_author"
android:text="21 minutes"
android:textSize="14dp" />
</RelativeLayout>
<TextView
android:id="@+id/comment_text"
android:layout_width="wrap_content"
android:layout_toRightOf="@+id/comment_image"
android:layout_height="wrap_content"
android:maxLines="3"
android:layout_marginTop="8dp"
android:layout_below="@id/middleLayout"
android:text="sd"
android:textColor="@android:color/black"
android:textSize="16dp" />
</RelativeLayout>
<View
android:id="@+id/divider"
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_gravity="bottom"
android:paddingLeft="16dp"
android:paddingRight="16dp"></View>
这就是我设置适配器的方式:
That is how I set up the adapter:
mLayoutManager = new LinearLayoutManager(this);
mLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
post_details_comments_list.setLayoutManager(mLayoutManager);
mCommentListAdapter = new CommentsAdapter(new ArrayList<PostComment>());
post_details_comments_list.setAdapter(mCommentListAdapter);
设置适配器后，getItemCount返回项的数量-因此不为null.
After I set up the adapter, I the getItemCount returns the quantity of the items - so that is not null.
RecycleView布局:
RecycleView layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.google.android.gms.maps.MapView
android:id="@+id/post_details_mapview"
android:layout_width="wrap_content"
android:layout_height="200dp" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/post_details_comments_count"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="@style/TextLabelStyle"/>
</RelativeLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/post_details_comments_list"
android:layout_width="match_parent"
android:scrollbars="vertical"
android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/edit_comment"
android:hint="@string/hint_type_comment"/>
</LinearLayout>
我向服务器发出请求，这是回调，在这里我得到结果并设置适配器:
I make the request to the server and here is the callback, where I get the results and set up the adapter:
@Override
public void onAllPostCommentsCallback(AllComments allComments) {
Log.i(TAG + " I've the comments", allComments.getPostCommentList().toString());
mCommentListAdapter.addItems(allComments.getPostCommentList());
post_details_comments_list.setAdapter(mCommentListAdapter);
mCommentListAdapter.notifyDataSetChanged();
}
但是列表未显示. 可能是什么原因?
But the list is not displaying. What can be the reason?
推荐答案
我已经解决了该问题.问题是我在NestedScrollView里面有RecycleView
I've already solved the issue. The problem was that I had RecycleView inside the NestedScrollView
这篇文章中的答案对我有很大帮助: 如何在NestedScrollView中使用RecyclerView?
Answer in this post helped me a lot: How to use RecyclerView inside NestedScrollView?
这篇关于RecycleView不显示数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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