Java RecyclerView：未连接适配器；跳过布局问题
我得到了一个错误： 回收视图﹕ 无适配器连接；跳过布局 我检查了一些其他人对此问题给出的答案，但没有运气 适配器：Java RecyclerView：未连接适配器；跳过布局问题,java,android,android-studio,android-recyclerview,Java,Android,Android Studio,Android Recyclerview,我得到了一个错误： 回收视图﹕ 无适配器连接；跳过布局 我检查了一些其他人对此问题给出的答案，但没有运气 适配器： public class MyAdapter extends RecyclerView.Adapter<com.example.myapplication.MyAdapter.MyViewHolder> { private Context context; private List<HeadlineModel> headlineModelL
public class MyAdapter extends RecyclerView.Adapter<com.example.myapplication.MyAdapter.MyViewHolder> {
private Context context;
private List<HeadlineModel> headlineModelList;
public MyAdapter(Context context, List<HeadlineModel> headlineModelList) {
this.context = context;
this.headlineModelList = headlineModelList;
}
@NonNull
@Override
public com.example.myapplication.MyAdapter.MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view= LayoutInflater.from(context).inflate(R.layout.news_item_layout,parent,false);
return new MyViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull final com.example.myapplication.MyAdapter.MyViewHolder holder, int position) {
final HeadlineModel headlineModel=headlineModelList.get(position);
holder.newTitle.setText(headlineModel.getTitle());
holder.newsDescription.setText(headlineModel.getDescription());
holder.newsDescription.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Uri uri= Uri.parse(headlineModel.getUrl());
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
context.startActivity(intent);
//Log.v("SSSSSS",headlineModel.getUrl());
}
});
holder.newsName.setText(headlineModel.getName());
holder.newsTime.setText(headlineModel.getPublishedAt());
Glide.with(context).load(headlineModel.getUrlToImage())
.thumbnail(0.5f)
.into(holder.newsImage);
}
@Override
public int getItemCount() {
return headlineModelList.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView newTitle;
TextView newsDescription;
TextView newsName;
TextView newsTime;
ImageView newsImage;
public MyViewHolder(@NonNull View itemView) {
super(itemView);
newTitle=itemView.findViewById(R.id.tv_news_title);
newsDescription=itemView.findViewById(R.id.tv_news_desc);
newsName=itemView.findViewById(R.id.tv_name);
newsTime=itemView.findViewById(R.id.tv_news_date);
newsImage=itemView.findViewById(R.id.im_news_image);
}
}
}
RecyclerView recyclerView;
com.example.myapplication.MyAdapter myAdapter;
private ProgressDialog progressDialog;
List<com.example.myapplication.HeadlineModel> headlineModelList;
private static final String URL="http://newsapi.org/v2/top-headlines?country=in&apiKey=cbd46bd6a4f54fe69d0cb261dbe1a878";
public HeadlinesFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootview=inflater.inflate(R.layout.fragment_headlines, container, false);
// Inflate the layout for this fragment
recyclerView=rootview.findViewById(R.id.headRecyclerView);
headlineModelList=new ArrayList<>();
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL,false));
progressDialog=new ProgressDialog(getContext(),R.style.ProgressColor);
progressDialog.setMessage("loading...");
progressDialog.show();
loadData();
return rootview;
}
RecyclerView-RecyclerView；
com.example.myapplication.MyAdapter MyAdapter；
私有进程对话；
列表标题模型列表；
私有静态最终字符串URL=”http://newsapi.org/v2/top-headlines?country=in&apiKey=cbd46bd6a4f54fe69d0cb261dbe1a878";
公共标题片段（）{
//必需的空公共构造函数
}
@凌驾
创建视图上的公共视图（布局、充气机、视图组容器、，
Bundle savedInstanceState）{
视图根视图=充气机。充气（R.layout.fragment\u标题，容器，false）；
//为该碎片膨胀布局
RecycleView=rootview.findViewById（R.id.HeadleCyclerView）；
headlineModelList=新的ArrayList（）；
recyclerView.setHasFixedSize（true）；
setLayoutManager（新的LinearLayoutManager（getContext（），LinearLayoutManager.VERTICAL，false））；
progressDialog=新建progressDialog（getContext（），R.style.ProgressColor）；
progressDialog.setMessage（“加载…”）；
progressDialog.show（）；
loadData（）；
返回rootview；
}
private void loadData() {
progressDialog.setMessage("Loading data...");
//progressDialog.show();
JsonObjectRequest jsonObjectRequest=new JsonObjectRequest(Request.Method.GET, URL, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
progressDialog.dismiss();
try {
JSONArray jsonArray=response.getJSONArray("articles");
for (int i=0;i<jsonArray.length();i++){
JSONObject jsonObject=jsonArray.getJSONObject(i);
String title=jsonObject.getString("title");
String desc=jsonObject.getString("description");
String url=jsonObject.getString("url");
String urlToImage=jsonObject.getString("urlToImage");
String publishedAt=jsonObject.getString("publishedAt");
JSONObject source=jsonObject.getJSONObject("source");
String name=source.getString("name");
// for formatting time and date //
String year=publishedAt.substring(0,4);
String month=publishedAt.substring(5,7);
String date=publishedAt.substring(8,10);
String hour=publishedAt.substring(11,13);
//String hour="11";
String min=publishedAt.substring(14,16);
//Log.v("XXXXXX",min);
String updatedDate=date.concat("-").concat(month).concat("-").concat(year).concat(" ");
String print="";
int convertHour= Integer.parseInt(hour);
int convertMin= Integer.parseInt(min);
if (convertHour==12) {
convertHour=12;
print="PM";
}
else if (convertHour>11&&convertMin>0){
convertHour=convertHour-12;
print="PM";
}else {
print="AM";
}
String newHour= String.valueOf(convertHour);
String updatedTime=updatedDate.concat(newHour).concat(":").concat(min).concat(" ").concat(print);
myAdapter=new com.example.myapplication.MyAdapter(getContext(),headlineModelList);
com.example.myapplication.HeadlineModel headlineModel=new com.example.myapplication.HeadlineModel(name,title,desc,url,urlToImage,updatedTime);
headlineModelList.add(headlineModel);
recyclerView.setAdapter(myAdapter);
myAdapter.notifyDataSetChanged();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
})
{
@Override
protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
try {
Cache.Entry cacheEntry = HttpHeaderParser.parseCacheHeaders(response);
if (cacheEntry == null) {
cacheEntry = new Cache.Entry();
}
final long cacheHitButRefreshed = 3 * 60 * 1000; // in 3 minutes cache will be hit, but also refreshed on background
final long cacheExpired = 24 * 60 * 60 * 1000; // in 24 hours this cache entry expires completely
long now = System.currentTimeMillis();
final long softExpire = now + cacheHitButRefreshed;
final long ttl = now + cacheExpired;
cacheEntry.data = response.data;
cacheEntry.softTtl = softExpire;
cacheEntry.ttl = ttl;
String headerValue;
headerValue = response.headers.get("Date");
if (headerValue != null) {
cacheEntry.serverDate = HttpHeaderParser.parseDateAsEpoch(headerValue);
}
headerValue = response.headers.get("Last-Modified");
if (headerValue != null) {
cacheEntry.lastModified = HttpHeaderParser.parseDateAsEpoch(headerValue);
}
cacheEntry.responseHeaders = response.headers;
final String jsonString = new String(response.data,
HttpHeaderParser.parseCharset(response.headers));
return Response.success(new JSONObject(jsonString), cacheEntry);
} catch (UnsupportedEncodingException | JSONException e) {
return Response.error(new ParseError(e));
}
}
@Override
protected void deliverResponse(JSONObject response) {
super.deliverResponse(response);
}
@Override
public void deliverError(VolleyError error) {
super.deliverError(error);
}
@Override
protected VolleyError parseNetworkError(VolleyError volleyError) {
return super.parseNetworkError(volleyError);
}
};
RequestQueue queue= Volley.newRequestQueue(getContext());
queue.add(jsonObjectRequest);
}
private void loadData（）{
progressDialog.setMessage（“正在加载数据…”）；
//progressDialog.show（）；
JsonObjectRequest JsonObjectRequest=新的JsonObjectRequest（Request.Method.GET，URL，null，new Response.Listener（））{
@凌驾
公共void onResponse（JSONObject响应）{
progressDialog.disclose（）；
试一试{
JSONArray JSONArray=response.getJSONArray（“文章”）；
对于（int i=0；i11&&convertMin>0）{
convertHour=convertHour-12；
print=“PM”；
}否则{
print=“AM”；
}
String newHour=String.valueOf（convertHour）；
字符串updatedTime=updatedDate.concat（newHour）.concat（“：”）.concat（min）.concat（“”）.concat（print）；
myAdapter=new com.example.myapplication.myAdapter（getContext（），headlineModelList）；
com.example.myapplication.HeadlineModel HeadlineModel=new com.example.myapplication.HeadlineModel（名称、标题、说明、url、urlToImage、updatedTime）；
headlineModelList.add（headlineModel）；
recyclerView.setAdapter（myAdapter）；
myAdapter.notifyDataSetChanged（）；
}
}捕获（JSONException e）{
e、 printStackTrace（）；
}
}
}，new Response.ErrorListener（）{
@凌驾
公共无效onErrorResponse（截击错误）{
}
})
{
@凌驾
受保护的响应parseNetworkResponse（NetworkResponse响应）{
试一试{
Cache.Entry cacheEntry=HttpHeaderParser.parseCacheHeaders（响应）；
if（cacheEntry==null）{
cacheEntry=new Cache.Entry（）；
}
final long cachehitbutrefresh=3*60*1000；//3分钟后将命中缓存，但也会在后台刷新
最终长缓存过期=24