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아무도 도와 줄 수 있습니까? POST 메서드를 사용하여 서버의 데이터를 확장 가능한 목록보기로 만들려고합니다. 하지만 난 오류가있어 여기에 null 객체 참조 에 'INT java.util.List.size()가'내 코드Android Studio, JSON 발리에서 ExpandableListView를 생성하는 방법은 무엇입니까?
private ExpandableListView listView;
private ExpandableListAdapter listAdapter;
private List<String> listDataHeader;
private HashMap<String, List<String>> listHash;
Button btnSearch;
EditText search;
String kata;
String statutory_url = "http://ds.bki.co.id:7777/ds/android/datasurvey.php";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnSearch = (Button) findViewById(R.id.btnSearch);
search = (EditText) findViewById(R.id.editText);
listView = (ExpandableListView) findViewById(R.id.ExpList);
btnSearch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
kata = search.getText().toString();
getData();
}
});
listAdapter = new ExpandableListAdapter(this,listDataHeader,listHash);
listView.setAdapter(listAdapter);
}
private void getData(){
RequestQueue queue = Volley.newRequestQueue(this.getApplicationContext());
StringRequest stringRequest = new StringRequest(Request.Method.POST, statutory_url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONArray jsonArray = new JSONArray(response);
listDataHeader = new ArrayList<>();
listHash = new HashMap<>();
final int result = jsonArray.length();
for (int i = 0; i < result; i++){
JSONObject jsonObject = jsonArray.getJSONObject(i);
String surv = jsonObject.getString("survey");
String last = jsonObject.getString("last");
String next1 = jsonObject.getString("next1");
String next2 = jsonObject.getString("next2");
String surveyor = jsonObject.getString("surveyor");
listDataHeader.add(surv);
List<String> data = new ArrayList<>();
data.add(last);
data.add(next1);
data.add(next2);
data.add(surveyor);
listHash.put(listDataHeader.get(i), data);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
})
{
@Override
protected Map<String, String> getParams()throws AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
params.put("noregister", kata);
return params;
}
};
queue.add(stringRequest);
}
}이며,이 내 어댑터입니다
public class ExpandableListAdapter extends BaseExpandableListAdapter {
private Context context;
private List<String> listDataHeader;
private HashMap<String,List<String>> listHashMap;
public ExpandableListAdapter(Context context, List<String> listDataHeader, HashMap<String, List<String>> listHashMap) {
this.context = context;
this.listDataHeader = listDataHeader;
this.listHashMap = listHashMap;
}
@Override
public int getGroupCount() {
return listDataHeader.size();
}
@Override
public int getChildrenCount(int i) {
return listHashMap.get(listDataHeader.get(i)).size();
}
@Override
public Object getGroup(int i) {
return listDataHeader.get(i);
}
@Override
public Object getChild(int i, int i1) {
return listHashMap.get(listDataHeader.get(i)).get(i1);
}
@Override
public long getGroupId(int i) {
return i;
}
@Override
public long getChildId(int i, int i1) {
return i1;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {
String headerTitle = (String)getGroup(i);
if (view == null){
LayoutInflater inflater = (LayoutInflater)this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.list_group, null);
}
TextView lblListHeader = (TextView)view.findViewById(R.id.lblListHeader);
lblListHeader.setTypeface(null, Typeface.BOLD);
lblListHeader.setText(headerTitle);
return view;
}
@Override
public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {
final String childText = (String)getChild(i,i1);
if (view == null){
LayoutInflater inflater = (LayoutInflater)this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.list_item, null);
}
TextView txtListChild = (TextView)view.findViewById(R.id.lblListItem);
txtListChild.setText(childText);
return view;
}
@Override
public boolean isChildSelectable(int i, int i1) {
return true;
}
}
감사합니다. 그것의 작품 – rizal
그것은 내 기쁨이야. 일단 당신이 대답을 한 번 만족 시키면 위로 upvote. :) –
확인. 나는 그것을 할 것이다 – rizal