E/RecyclerView:没有附加适配器;跳绳布局
我是初学者,我试图做一个RSS feed应用程序,但每次我试图发动对我的模拟器或电话我的应用程序时它给了我这些错误(S):E/RecyclerView:没有附加适配器;跳绳布局
05-14 18:25:17.750 2350-2350/? E/RecyclerView: No adapter attached; skipping layout
05-14 18:25:17.916 2350-2350/? E/RecyclerView: No adapter attached; skipping layout
05-14 18:25:18.342 2350-2350/com.gaming.labneh.rssreader I/Choreographer: Skipped 33 frames! The application may be doing too much work on its main thread.
05-14 18:25:18.356 2350-2350/com.gaming.labneh.rssreader E/RecyclerView: No adapter attached; skipping layout
05-14 18:25:19.266 2350-2364/com.gaming.labneh.rssreader E/Surface: getSlotFromBufferLocked: unknown buffer: 0xaaa23b20
下面是类:
public class ReadRss extends AsyncTask<Void,Void,Void> {
Context context;
String address="https://www.sciencemag.org/rss/news_current.xml";
ProgressDialog progressDialog;
ArrayList<FeedItem>feedItems;
RecyclerView recyclerView;
URL url;
public ReadRss(Context context,RecyclerView recyclerView){
this.recyclerView=recyclerView;
this.context=context;
progressDialog=new ProgressDialog(context);
progressDialog.setMessage("Loading...");
}
@Override
protected void onPreExecute() {
progressDialog.show();
super.onPreExecute();
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
progressDialog.dismiss();
MyAdapter adapter=new MyAdapter(context,feedItems);
recyclerView.setLayoutManager(new LinearLayoutManager(context));
recyclerView.setAdapter(adapter);
}
@Override
protected Void doInBackground(Void... params) {
ProcessXml(Getdata());
return null;
}
private void ProcessXml(Document data) {
if (data != null) {
feedItems=new ArrayList<>();
Element root=data.getDocumentElement();
Node channel =root.getChildNodes().item(1);
NodeList items=channel.getChildNodes();
for (int i=0;i<items.getLength();i++){
Node cureentchild=items.item(1);
if (cureentchild.getNodeName().equalsIgnoreCase("item")){
FeedItem item=new FeedItem();
NodeList itemchilds=cureentchild.getChildNodes();
for (int j=0;j<itemchilds.getLength();j++){
Node cureent=itemchilds.item(j);
if (cureent.getNodeName().equalsIgnoreCase("title")) {
item.setTitle(cureent.getTextContent());
}else if (cureent.getNodeName().equalsIgnoreCase("description")){
item.setDescription(cureent.getTextContent());
}else if (cureent.getNodeName().equalsIgnoreCase("pubDate")){
item.setPubDate(cureent.getTextContent());
}else if (cureent.getNodeName().equalsIgnoreCase("link")) {
item.setLink(cureent.getTextContent());
}else if (cureent.getNodeName().equalsIgnoreCase("media:thumbnail")){
//this will return us thumbnail url
String url=cureent.getAttributes().item(0).getTextContent();
item.setThumbnailUrl(url);
}
}
feedItems.add(item);
Log.d("itemThumbnailUrl", item.getThumbnailUrl());
}
}}}
public Document Getdata(){
try {
url=new URL(address);
HttpURLConnection connection= (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
InputStream inputStream=connection.getInputStream();
DocumentBuilderFactory builderFactory=DocumentBuilderFactory.newInstance();
DocumentBuilder builder=builderFactory.newDocumentBuilder();
Document xmlDoc= builder.parse(inputStream);
return xmlDoc;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
}
而且
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
ArrayList<FeedItem>feedItems;
Context context;
public MyAdapter(Context context,ArrayList<FeedItem>feedItems){
this.feedItems=feedItems;
this.context=context;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view= LayoutInflater.from(context).inflate(R.layout.custom_row_news_item,parent,false);
MyViewHolder holder=new MyViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
FeedItem current=feedItems.get(position);
holder.Title.setText(current.getTitle());
holder.Description.setText(current.getDescription());
holder.Date.setText(current.getPubDate());
Picasso.with(context).load(current.getThumbnailUrl()).into(holder.Thumbnail);
}
@Override
public int getItemCount() {
return feedItems.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView Title,Description,Date;
ImageView Thumbnail;
public MyViewHolder(View itemView) {
super(itemView);
Title= (TextView) itemView.findViewById(R.id.title_text);
Description= (TextView) itemView.findViewById(R.id.description_text);
Date= (TextView) itemView.findViewById(R.id.date_text);
Thumbnail= (ImageView) itemView.findViewById(R.id.thumb_img);
}
}
}
我真的希望你能帮帮我,谢谢!
编辑:
public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
recyclerView= (RecyclerView) findViewById(R.id.recyclerview);
ReadRss readRss=new ReadRss(this,recyclerView);
readRss.execute();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
,我认为你的错误是在这里:
Node cureentchild=items.item(1);
将其更改为:
Node cureentchild=items.item(i);
我感觉真的很蠢,谢谢一堆! –
有时这些小东西真的很难赶上:) – x0r
他们是你没有连接的适配器将recyclerview警告。
如果你打算在获得数据之前做很长时间的工作。您应该首先连接适配器,然后替换数据。
所以,你应该先附上您的适配器您的活动中:
MyAdapter adapter=new MyAdapter(context,feedItems);
recyclerView.setLayoutManager(new LinearLayoutManager(context));
recyclerView.setAdapter(adapter);
然后当你进去onPostExecute()
数据;只是清除您的数据集,用新的一个补充,只是通知适配器有关数据的变化:
...onPostExecute(){
feedItems.clear();
feedItems.addAll(newFeedItems);
adapter.notifyDataSetChanged();
}
另注:如果你把你的AsyncTask您的活动被破坏后运行;你的视图将会被破坏,你会得到严重的崩溃。此外,将异步任务作为内部类保留在您的活动中可能导致严重的内存泄漏。请提供回调。
请张贴在那里你执行'ReadRss'并通过'RecycleView' –
好吧,我已经更新了帖子。 @shayanpourvatan –