我在擴展片段的類內部使用recyclerview。但沒有顯示。我在類裏面調用了StringRequest onResponse函數裏的recyclerview。以下是我的代碼。任何人都可以幫助我解決這個問題。無法顯示片段類中的recyclerview內容
ChatMessageGroups的構造函數被調用,但onCreateViewHolder()& onBindViewHolder()不是。所述getItemCount()也返回多於0
ChatGroups.java
public class ChatGroups extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.activity_chat_groups, container, false);
final RequestQueue queue = Volley.newRequestQueue(view.getContext());
StringRequest strReq = new StringRequest(Request.Method.POST, URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try
{
JSONObject jsonResponse = new JSONObject(response);
RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view_chat_groups);
ChatMessageGroups mAdapter = new ChatMessageGroups(jsonResponse.getString("groups"));
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getActivity(),LinearLayoutManager.HORIZONTAL,false);
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setAdapter(mAdapter);
}
catch (Exception e)
{
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getActivity(), error.getMessage(), Toast.LENGTH_LONG).show();
}
}) {
@Override
protected HashMap<String, String> getParams() {
HashMap<String, String> details = new HashMap<String, String>();
details.put("key", session.getKey());
return details;
}
};
queue.add(strReq);
return inflater.inflate(R.layout.activity_chat_groups, container, false);
}
}
ChatMessageGroups.java
public class ChatMessageGroups extends RecyclerView.Adapter<ChatMessageGroups.MyViewHolder> {
private final JSONArray messages;
class MyViewHolder extends RecyclerView.ViewHolder {
TextView group_name;
MyViewHolder(View view) {
super(view);
group_name = (TextView) view.findViewById(R.id.group_name);
}
}
ChatMessageGroups(JSONArray messages) {
this.messages = messages;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_chat_groups_list, parent, false);
return new MyViewHolder(itemView);
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position)
{
try
{
HashMap<String, String> maps = (HashMap<String, String>) messages.get(position);
for(HashMap.Entry<String, String> v: maps.entrySet())
{
String key = String.valueOf(v.getKey());
String value = String.valueOf(v.getValue());
holder.group_name.setText(value);
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
@Override
public int getItemCount() {
return messages.length();
}
}
activity_chat_groups_list.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/group_name"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:layout_margin="5dp"
android:textColor="@color/black"
android:visibility="gone"/>
</LinearLayout>
activity_chat_groups.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view_chat_groups"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="55dp"
android:scrollbars="vertical"/>
</LinearLayout>
如果我嘗試在onBindViewHolder中打印任何內容,則不會打印任何內容。 –
嘗試調用adapter.notifyDatasetChanged(),將適配器設置爲recyclerview後 – Darish
嘗試使用此..但仍不能正常工作.. –