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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);
}
}
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 –