我的应用程序中有一个导航抽屉，我想显示一个自定义布局的列表视图，这些布局通过齐射填充。 **代码没有给我任何错误，但列表视图中没有条目。**有人能告诉我错误是什么吗？我究竟做错了什么？ 这是片段的代码。
package com.example.vishal.navtest2;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
/**
* A simple {@link Fragment} subclass.
*/
public class BlankFragment extends Fragment {
public BlankFragment() {
// Required empty public constructor
}
RequestQueue requestQueue;
String reqUrl = "http://192.168.1.7/Tutorial/requestGetTry.php";
final List<String> requestNoList = new ArrayList<String>();
final List<String> requestDescriptionList = new ArrayList<String>();
final List<String> dateList = new ArrayList<String>();
final List<String> statusList = new ArrayList<String>();
String[] menuItems = {"item 1","Item 2","Item 3","item 1","Item 2","Item 3","item 1","Item 2","Item 3","item 1","Item 2","Item 3",};
String disp = "";
int len ;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.fragment_blank, container, false);
requestQueue = Volley.newRequestQueue(getActivity().getApplicationContext());
ListView listView = (ListView) view.findViewById(R.id.listView);
// String[] reqDetPass = new String[5];
JsonObjectRequest req = new JsonObjectRequest(Request.Method.POST, reqUrl, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
JSONArray requests = response.getJSONArray("request");
len = requests.length();
for(int i = 0; i < requests.length(); i++){
JSONObject request = requests.getJSONObject(i);
String no = request.getString("requestno");
String desc = request.getString("description");
String date = request.getString("date");
String status = request.getString("status");
Toast.makeText(getActivity(), no+desc+date+status, Toast.LENGTH_SHORT).show();
requestNoList.add(no);
requestDescriptionList.add(desc);
dateList.add(date);
statusList.add(status);
disp = disp + requestNoList.get(i);
}
//Toast.makeText(getActivity(), "Disp: "+disp, Toast.LENGTH_SHORT).show();
if(requestNoList == null){
Toast.makeText(getActivity(), "Null In ReqList", Toast.LENGTH_SHORT).show();
}
ListView listView = (ListView) view.findViewById(R.id.listView);
CustomAdapter customAdapter = new CustomAdapter();
String[] stringArray = requestNoList.toArray(new String[0]);
String[] dummy = {"Item 1","Item 2","Item 3","Item 4","Item 5","Item 6","Item 7","Item 8","Item 9","Item 10","Item 11",};
final ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, stringArray);
final ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, dummy);
listView.setAdapter(customAdapter);
Toast.makeText(getContext(), String.valueOf(requestDescriptionList.toArray()[0]), Toast.LENGTH_LONG).show();
customAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
//requestNoList.add(e.toString());
Toast.makeText(getActivity(), e.toString(), Toast.LENGTH_SHORT).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
//requestNoList.add(error.toString());
Toast.makeText(getContext(), error.toString(), Toast.LENGTH_SHORT).show();
}
});
requestQueue.add(req);
String[] data = new String[len];
for(int i = 0; i<len ; i++){
data[i] = requestNoList.get(i);
}
/*ListView listView = (ListView) view.findViewById(R.id.listView);
String[] stringArray = requestNoList.toArray(new String[10]);
final ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, stringArray);
listView.setAdapter(adapter);*/
//Toast.makeText(getActivity(), stringArray[0], Toast.LENGTH_SHORT).show();
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// int color = parent.getAdapter().getItem(position);
// position = position - 1 ;
Toast.makeText(getActivity(), "position: "+position+"id: "+id, Toast.LENGTH_SHORT).show();
String data = parent.getAdapter().getItem(position).toString();
Toast.makeText(getActivity(),"data "+ data, Toast.LENGTH_SHORT).show();
String reqNo = requestNoList.get(position);
Toast.makeText(getActivity(),"reqno "+reqNo , Toast.LENGTH_SHORT).show(); //String.valueOf(position)
Intent intent = new Intent(getActivity(), ReqDisp.class);
intent.putExtra("Position",reqNo);
startActivity(intent);
}
});
return view;
}
class CustomAdapter extends BaseAdapter{
@Override
public int getCount() {
return 0;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@SuppressLint("ViewHolder")
@Override
public View getView(int i, View view, ViewGroup parent) {
view = getActivity().getLayoutInflater().inflate(R.layout.custom_layout_listview, null);
TextView textView_request = (TextView)view.findViewById(R.id.tvReq);
TextView textView_description = (TextView)view.findViewById(R.id.tvDesc);
TextView textView_dates = (TextView)view.findViewById(R.id.tvDate);
ImageView imageView = (ImageView)view.findViewById(R.id.imageView4);
if(String.valueOf(requestNoList.toArray()[i]) == null){
textView_request.setText("Empty "+String.valueOf(i));
}
//textView_request.setText(String.valueOf(requestNoList.toArray()[i]));
textView_description.setText(String.valueOf(requestDescriptionList.toArray()[i]));
textView_dates.setText(String.valueOf(dateList.toArray()[i]));
if(String.valueOf(statusList.toArray()[i]).equals("0")){
imageView.setImageResource(R.drawable.ic_new_releases_black_24dp);
}
else{
imageView.setImageResource(R.drawable.ic_home_black_24dp);
}
return null;
}
}
}
请帮忙。
答案 0 :(得分：0)
无法指出确切的解决方案，但这里有一些指针/输入：