问题：Android凌空列表视图未显示。
描述：尝试以listview格式获取Json数据，在它显示的logcat中，即使我能够正确解析它。 但是当我尝试在Fragment中运行它时它不会显示任何内容 这个错误。
W / AbsListView：意图操作不存在的数据，childcount = 0，mFirstPosition = 0，mItemCount = 0，适配器计数= 0，mAdapter = com.brillmindz.roomshare.CustomListAdapter @ 3fbf203f，action = 0，mActivePointerId = 0，mScrollY = 0，这= android.widget.ListView {1752f18f V.ED.VC. ........ 0,0-540,691＃7f0d004c app：id / homelistView}
这是代码OF
HomepageFragment
public View onCreateView（LayoutInflater inflater，ViewGroup container，Bundle savedInstanceState）{
View rootView = inflater.inflate(R.layout.content_main, container, false);
// usersList = new ArrayList<String>();
listView = (ListView) rootView.findViewById(R.id.homelistView);
adapter = new CustomListAdapter(this,hotelLists);
listView.setAdapter(adapter);
pDialog = new ProgressDialog(getContext());
// Showing progress dialog before making http request
pDialog.setMessage("Loading...");
pDialog.show();
final StringRequest jsonObjReq = new StringRequest(Request.Method.POST, url_shareroom, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d(TAG, response);
pDialog.dismiss();
HotelList hotelList = new HotelList();
// adapter.notifyDataSetChanged();
try {
JSONObject jsonObject = new JSONObject(response);
String hotelsDetailsArray = jsonObject.getString("hotelsDetails");
Log.d("Hotel name : ", hotelsDetailsArray);
JSONArray jsonArray = new JSONArray(hotelsDetailsArray);
for(int i = 0; i<jsonArray.length();i++) {
JSONObject mJsonObject = jsonArray.getJSONObject(i);
String hotelName = mJsonObject.getString("hotel_name");
Log.d("Hotel name : ", hotelName);
String city = mJsonObject.getString("city");
Log.d("City : ", city);
String state = mJsonObject.getString("state");
Log.d("State : ", state);
String country = mJsonObject.getString("country");
Log.d("Country : ", country);
String address = mJsonObject.getString("address");
Log.d("Address : ", address);
String list_title = mJsonObject.getString("list_title");
Log.d("list_title : ", list_title);
String check_in_date = mJsonObject.getString("check_in_date");
Log.d("check_in_date : ", check_in_date);
String check_out_date = mJsonObject.getString("check_out_date");
Log.d("check_out_date : ", check_out_date);
String rate = mJsonObject.getString("rate");
Log.d("rate : ", rate);
String created = mJsonObject.getString("created");
Log.d("created : ", created);
String created_time = mJsonObject.getString("created_time");
Log.d("created_time : ", created_time);
String matching_percentage = mJsonObject.getString("matching_percentage");
Log.d("matching_percentage : ", matching_percentage);
String star_rating = mJsonObject.getString("star_rating");
Log.d("star_rating : ", star_rating);
String reviews = mJsonObject.getString("reviews");
Log.d("reviews : ", reviews);
hotelLists.add(hotelList);
}
} catch (JSONException e1) {
e1.printStackTrace();
}
} catch (JSONException e1) {
e1.printStackTrace();
}
** adapter = new CustomListAdapter(this,hotelLists);
listView.setAdapter(adapter);
adapter.notifyDatasetChanged();**
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
/* Log.e("Error Response", error.toString());*/
Log.e(TAG, "Volley Error: " + error.getMessage());
//
Toast.makeText(MainActivity.this,error.toString(),Toast.LENGTH_LONG).show();
}
}) {
protected Map<String, String> getParams() throws com.android.volley.AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
params.put("user_id", "80");
return params;
}
};
AppController.getInstance().addToRequestQueue(jsonObjReq);
return rootView;
}
@Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
}
自定义列表适配器
public class CustomListAdapter extends BaseAdapter {
private HomePageFragment homePageFragment;
Context mycontext;
private LayoutInflater inflater;
private List<HotelList> hotelItems;
ImageLoader imageLoader = AppController.getInstance().getImageLoader();
public CustomListAdapter(HomePageFragment hpfragment, List<HotelList> hotelItems) {
this.homePageFragment = hpfragment;
this.hotelItems = hotelItems;
}
@Override
public int getCount() {
return hotelItems.size();
}
@Override
public Object getItem(int location) {
return hotelItems.get(location);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) mycontext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = inflater.inflate(R.layout.list_row, null);
}
/* if (imageLoader == null)
imageLoader = AppController.getInstance().getImageLoader();
NetworkImageView thumbNail = (NetworkImageView) convertView
.findViewById(R.id.thumbnail);*/
TextView hotel_name = (TextView) convertView.findViewById(R.id.hotel_name);
TextView city = (TextView) convertView.findViewById(R.id.city);
TextView state = (TextView) convertView.findViewById(R.id.state);
TextView amenities =(TextView) convertView.findViewById(R.id.amenities);
TextView country = (TextView) convertView.findViewById(R.id.country);
// getting data for the row
HotelList m = hotelItems.get(position);
hotel_name.setText(m.getHotel_name());
Log.e("Hotelname", m.getHotel_name());
city.setText(m.getCity());
Log.e("city", m.getCity());
amenities.setText(m.getAmenities());
Log.e("amenities", m.getAmenities());
state.setText(m.getState());
Log.e("state", m.getState());
country.setText(m.getCountry());
Log.e("country", m.getCountry());
return convertView;
}
}
酒店列表
public class HotelList {
private String
hotel_name,
rate,
city,
state,
country,
address,
list_title,
check_in_date,
check_out_date,
amenities,
created,
created_time,
match_percentage,
star_rating,
reviews;
private String user_Id;
public HotelList() {
}
public HotelList(String hotel_name, String city, String state, String country,
String address, String list_title, String check_in_date, String amenities,
String check_out_date, String created, String created_time, String match_percentage, String star_rating, String reviews
) {
this.hotel_name= hotel_name;
this.city = city;
this.amenities= amenities;
this.state = state;
this.country= country;
this.address= address;
this.list_title = list_title;
this.check_in_date= check_in_date;
this.check_out_date= check_out_date;
this.created =created;
this.rate= rate;
this.created_time= created_time;
this.match_percentage= match_percentage;
this.star_rating = star_rating;
this.reviews= reviews;
}
//STRING
private String created() {
return created;
}
private String created_time() {
return created_time;
}
private String star_rating() {
return star_rating;
}
private String match_percentage() {
return match_percentage;
}
private String reviews() {
return reviews;
}
public String getCity() {
return city;
}
public String getState() {
return state;
}
public String getCountry() {
return country;
}
public String getAddress() {
return address;
}
public String getHotel_name() {
return hotel_name;
}
public String getList_title() {
return list_title;
}
private String check_out_date() {
return check_out_date;
}
private String check_in_date() {
return check_in_date;
}
private String list_title() {
return list_title;
}
private String address() {
return address;
}
private String hotel_name() {
return hotel_name;
}
public String getCheck_in_date() {
return check_in_date;
}
public String getCheck_out_date() {
return check_out_date;
}
private String country() {
return country;
}
private String state() {
return state;
}
private String city() {
return city;
}
public String getAmenities() {
return amenities;
}
public String getRate() {
return rate;
}
//SETTER
public void setState(String state) {
this.state = state;
}
public void setHotel_name(String hotel_name) {
this.hotel_name = hotel_name;
}
public void setCity(String city) {
this.city = city;
}
public void setAddress(String address) {
this.address = address;
}
public void setList_title(String list_title) {
this.list_title = list_title;
}
public void setCheck_in_date(String check_in_date) {
this.check_in_date = check_in_date;
}
public void setCountry(String country) {
this.country = country;
}
public void setCheck_out_date(String check_out_date) {
this.check_out_date = check_out_date;
}
public void setAmenities(String amenities) {
this.amenities = amenities;
}
public void setUser_Id(String user_Id) {
this.user_Id = user_Id;
}
public void setGenre(ArrayList<String> genre) {
}
public String getCreated_time() {
return created_time;
}
public String getMatch_percentage() {
return match_percentage;
}
public String getStar_rating() {
return star_rating;
}
public String getReviews() {
return reviews;
}
}
MY JSON回复
{ “成功”：“1”， “hotelsDetails”：[{ “id”：“1”， “hotel_name”：“纽约中央公园丽思卡尔顿酒店”， “城市”：“纽约”， “设施”：“”， “州”：“阿拉斯加”， “国家”：“美国”， “地址”：“50 Central Park S New York 10019”， “list_title”：“纽约丽思卡尔顿酒店”， “check_in_date”：“2016-03-17”， “check_out_date”：“2016-03-21”， “率”：“100”， “创造”：“2016-02-11”， “created_time”：“00:00:00”， “matching_percentage”：“73”， “star_rating”：“3”， “评论”：“15” }，{ “id”：“2”，
我错了。？
答案 0 :(得分：0)
你没有解决凌空反应的任何事情 您应该解析响应并将其添加到本部分的适配器
@Override
public void onResponse(String response) {
Log.d(TAG, response);
//parse data and add to adapter
pDialog.dismiss();
}
另外，你的列表在凌空响应之前的初始位置是什么？
并且您的响应是jsonobject，使用JsonRequest而不是StringRequest
答案 1 :(得分：0)
您正在适配器中设置一个空列表，当您从后端获取数据并使用数据更新列表时，您不会使用列表中的新数据更新适配器。在使用数据更新列表后，只需致电adapter.notifyDatasetChanged()即可。这应该有效。
答案 2 :(得分：0)
完成解析JSON后，即：try/catch块后，执行以下操作。
adapter = new CustomListAdapter(this,newHotelLists);
listView.setAdapter(adapter);
adapter.notifyDatasetChanged();
newHotelsList是您下载的新酒店列表。