我正在从服务器获取数据。然后数据将传递给适配器，但显示为空。
这是错误部分：
为什么我得到的数据为空？
我在这里遇到什么问题？
请帮助。下面我附上我的适配器代码和活动代码。
这是我的适配器代码：
public class Search_Adapter extends BaseAdapter implements Filterable {
private Context context;
private List<Model_Search.Model_Items> searchList;
private LayoutInflater inflater;
List<Model_Search.Model_Items> mStringFilterList;
ValueFilter valueFilter;
public Search_Adapter(Context context, List<Model_Search.Model_Items> searchList) {
this.context = context;
this.searchList = searchList;
mStringFilterList = searchList;
}
public int getCount() {
return searchList.size();
}
public Object getItem(int i) {
return searchList.get(i);
}
public long getItemId(int i) {
return i;
}
public View getView(int i, View view, ViewGroup viewGroup) {
if (inflater == null) {
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
if (view == null) {
view = inflater.inflate(R.layout.search_adapter_row, null);
}
MyTextView txtShopName = (MyTextView) view.findViewById(R.id.shop_name);
MyTextView txtItemName = (MyTextView) view.findViewById(R.id.item_name);
MyTextView txtPrice = (MyTextView) view.findViewById(R.id.item_price);
ImageView shop_image = (ImageView)view.findViewById(R.id.image);
final Model_Search.Model_Items model_items = searchList.get(i);
String shop_name = model_items.getShop_name();
String item_name = model_items.getItem_name();
String price = model_items.getItem_price();
String image = model_items.getImage();
txtShopName.setText(shop_name);
txtItemName.setText(item_name);
txtPrice.setText("₹"+price+"/-");
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent in = new Intent(context, Activity_Shop_Detail.class);
in.setFlags(FLAG_ACTIVITY_NEW_TASK);
in.putExtra("shop_id",model_items.getShop_id());
context.startActivity(in);
}
});
Picasso.with(context)
.load(Url.url + "profile_photo/" + image).into(shop_image);
return view;
}
@Override
public Filter getFilter() {
if (valueFilter == null) {
valueFilter = new ValueFilter();
}
return valueFilter;
}
private class ValueFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (constraint != null && constraint.length() > 0) {
ArrayList<Model_Search.Model_Items> filterList = new ArrayList<Model_Search.Model_Items>();
for (int i = 0; i < mStringFilterList.size(); i++) {
if ((mStringFilterList.get(i).getItem_name().toUpperCase()).contains(constraint.toString().toUpperCase())||
(mStringFilterList.get(i).getShop_name().toUpperCase()).contains(constraint.toString().toUpperCase()))
{
Model_Search.Model_Items bean = new Model_Search.Model_Items(mStringFilterList.get(i).getShop_id(),mStringFilterList.get(i).getItem_name(), mStringFilterList.get(i).getItem_price(),
mStringFilterList.get(i).getShop_name(),mStringFilterList.get(i).getImage());
filterList.add(bean);
}
}
results.count = filterList.size();
results.values = filterList;
} else {
results.count = mStringFilterList.size();
results.values = mStringFilterList;
}
return results;
}
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
searchList = (ArrayList<Model_Search.Model_Items>) results.values;
//notifyDataSetChanged();
}
}
}
这是我的活动代码：
public class Activity_Search extends AppCompatActivity implements
SearchView.OnQueryTextListener {
JSONArray insert_tbl;
List<NameValuePair> detail=new ArrayList<NameValuePair>();
String c_id;
LinearLayout fullLayout;
ProgressBar progressBar;
ArrayList<Model_Search> model_search=new ArrayList<>();
List<Model_Search.Model_Items> model_item=new ArrayList<>();
private ListView lv;
private SearchView sv;
Search_Adapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity__search);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
//ActionBar actionBar = getSupportActionBar();
//actionBar.setDisplayHomeAsUpEnabled(true);
detail.clear();
detail.add(new BasicNameValuePair("mode","search"));
detail.add(new BasicNameValuePair("lat", ""+latitude));
detail.add(new BasicNameValuePair("long",""+longitude));
sv = (SearchView) findViewById(R.id.search_view);
lv = (ListView) findViewById(R.id.lv);
fullLayout = (LinearLayout) findViewById(R.id.fullLayout);
progressBar = (ProgressBar)findViewById(R.id.progressBar);
Fetch_Search_Data f = new Fetch_Search_Data();
f.execute();
sv.setOnQueryTextListener(this);
}
@Override
public boolean onQueryTextSubmit(String s) {
if(!s.isEmpty()){
lv.setVisibility(View.VISIBLE);
}else{
lv.setVisibility(View.INVISIBLE);
}
adapter.getFilter().filter(s);
return false;
}
@Override
public boolean onQueryTextChange(String s) {
if(!s.isEmpty()){
lv.setVisibility(View.VISIBLE);
}else{
lv.setVisibility(View.INVISIBLE);
}
adapter.getFilter().filter(s);
return false;
}
@Override
public void onBackPressed()
{
finish();
super.onBackPressed();
}
class Fetch_Search_Data extends AsyncTask<String, String, String>
{
@Override
protected String doInBackground(String... arg0) {
// TODO Auto-generated method stub
JsonCall jparse = new JsonCall();
JSONObject jobj = jparse.getJSONFromUrl("http://grubbasket.com/grubag/api/app/search/"+latitude+"/"+longitude, "GET",detail);
try {
model_search.clear();
if (jobj != null) {
insert_tbl = jobj.getJSONArray("data");
for (int i1 = 0; i1 <= insert_tbl.length(); i1++) {
JSONObject s = insert_tbl.getJSONObject(i1);
c_id = s.getString("shop_id");
//Toast.makeText(Activity_Search.this, c_id, Toast.LENGTH_SHORT).show();
if (c_id.matches("0")) {
} else {
Model_Search m = new Model_Search();
m.setShop_id(s.getString("shop_id"));
m.setShop_name(s.getString("shop_name"));
m.setCuisines(s.getString("cuisines"));
m.setImage(s.getString("image"));
m.setDistance(s.getString("distance"));
for (int j = 0; j < s.getJSONArray("items").length(); j++) {
JSONObject s1 = s.getJSONArray("items").getJSONObject(j);
Model_Search.Model_Items model_items = new Model_Search.Model_Items();
model_items.setShop_id(s1.getString("shop_id"));
model_items.setItem_name(s1.getString("item_name"));
model_items.setShop_name(s1.getString("shop_name"));
model_items.setImage(s1.getString("image"));
model_items.setItem_price(s1.getString("price"));
model_item.add(model_items);
}
m.setModel_items(model_item);
model_search.add(m);
}
}
}
} catch (JSONException e) {
}
return null;
}
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
if(!c_id.equals("null")) {
} else {
//Toast.makeText(Activity_Search.this, "Data Retrieved !", Toast.LENGTH_SHORT).show();
adapter = new Search_Adapter(getApplicationContext(), model_item);
lv.setAdapter(adapter);
lv.invalidate();
lv.setVisibility(View.VISIBLE);
}
fullLayout.setVisibility(View.VISIBLE);
progressBar.setVisibility(View.GONE);
super.onPostExecute(result);
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
fullLayout.setVisibility(View.GONE);
progressBar.setVisibility(View.VISIBLE);
super.onPreExecute();
}
}
}
这是我的数组响应
{"success":true,"message":"Search Results","data":[{"shop_id":"60","uid":"85","shop_name":"The Dugout Cafe & Eatery","address":"Near apple global school","phone":"","locality":"Satellite","city":"Ahmedabad","state":"Gujarat","gst":"0","home_delivery":"NO","min_delivery_charge":"0","delivery_charge_per_km":"0","max_delivery_area_km":"5","website":"YES","website_name":"","cuisines":"cafe, italian, continental","veg":"","avg_cost":"650","min_order":"200","avg_time":"30-45","seating":"","current_status":"ONLINE","cafes":"YES","dinning":"NO","dessert":"YES","bakery":"","hotel":"","resort":"","bar":"","date":"2017-08-08","status":"active","offer_status":"","offer_percent":"0","ordering_status":"No","franchise_id":"0","payment_method":"C.O.D","gst_no":"","data_user":"7","latitude":"24.6011441","longitude":"73.7093526","image":"85.png","distance":4.2261161192851,"items":[{"item_id":"2313","mid":"336","item_name":"Classic French Fries ","description":"description","count":"1","price":"70","stock":"in","status":"active","shop_id":"60"},{"item_id":"2314","mid":"336","item_name":"Garlic Bread ","description":"description","count":"1","price":"80","stock":"in","status":"active","shop_id":"60"},{"item_id":"2315","mid":"336","item_name":"French Bruschetta ","description":"description","count":"1","price":"100","stock":"in","status":"active","shop_id":"60"},{"item_id":"2316","mid":"336","item_name":"Corn Cheese Cigar Rolls ","description":"description","count":"1","price":"100","stock":"in","status":"active","shop_id":"60"},{"item_id":"2317","mid":"336","item_name":"Maxican Cheese Balls ","description":"description","count":"1","price":"120","stock":"in","status":"active","shop_id":"60"},{"item_id":"2318","mid":"336","item_name":"Chicken Nuggets ","description":"description","count":"1","price":"150","stock":"in","status":"active","shop_id":"60"},{"item_id":"2319","mid":"336","item_name":"Fish Fingers ","description":"description","count":"1","price":"190","stock":"in","status":"active","shop_id":"60"},{"item_id":"2320","mid":"336","item_name":"Pesto Grilled Chicken ","description":"description","count":"1","price":"190","stock":"in","status":"active","shop_id":"60"},{"item_id":"2321","mid":"336","item_name":"Crispy Potato Wedges ","description":"description","count":"1","price":"70","stock":"in","status":"active","shop_id":"60"},{"item_id":"2322","mid":"336","item_name":"Cheese Garlic Bread ","description":"description","count":"1","price":"120","stock":"in","status":"active","shop_id":"60"}]},{"shop_id":"30","uid":"54","shop_name":"Bawarchi Restaurant","address":"6 - Delhi Gate, City Centre, Udaipur","phone":"6350000566","locality":"Delhi Gate","city":"Udaipur","state":"Rajasthan","gst":"2","home_delivery":"NO","min_delivery_charge":"0","delivery_charge_per_km":"0","max_delivery_area_km":"5","website":"NO","website_name":"","cuisines":"North Indian, continental","veg":"Veg","avg_cost":"1000","min_order":"150","avg_time":"30-45","seating":"YES","current_status":"OFFLINE","cafes":"NO","dinning":"YES","dessert":"NO","bakery":"NO","hotel":"NO","resort":"NO","bar":"NO","date":"08-09-2018","status":"active","offer_status":"NO","offer_percent":"0","ordering_status":"NO","franchise_id":"0","payment_method":"C.O.D,Online","gst_no":"2","data_user":"490","latitude":"24.5979398","longitude":"73.7097204","image":"54.png","distance":3.8807687984604,"items":[{"item_id":"380","mid":"167","item_name":"Jeera Aloo","description":"description","count":"1","price":"120","stock":"in","status":"active","shop_id":"30"},{"item_id":"381","mid":"167","item_name":"Aloo Tomato","description":"description","count":"1","price":"120","stock":"in","status":"active","shop_id":"30"},{"item_id":"382","mid":"167","item_name":"Aloo Palak","description":"description","count":"1","price":"125","stock":"in","status":"active","shop_id":"30"},{"item_id":"383","mid":"167","item_name":"Aloo Mutter","description":"description","count":"1","price":"120","stock":"in","status":"active","shop_id":"30"},{"item_id":"384","mid":"167","item_name":"Aloo Gobhi","description":"description","count":"1","price":"125","stock":"in","status":"active","shop_id":"30"},{"item_id":"385","mid":"167","item_name":"Gobi Masala","description":"description","count":"1","price":"130","stock":"in","status":"active","shop_id":"30"},{"item_id":"386","mid":"167","item_name":"Bhindi Masala ","description":"description","count":"1","price":"130","stock":"in","status":"active","shop_id":"30"},{"item_id":"387","mid":"167","item_name":"Palak Mutter ","description":"description","count":"1","price":"125","stock":"in","status":"active","shop_id":"30"},{"item_id":"388","mid":"167","item_name":"Aloo Palak","description":"description","count":"1","price":"125","stock":"in","status":"active","shop_id":"30"},{"item_id":"389","mid":"167","item_name":"Palak Corn ","description":"description","count":"1","price":"125","stock":"in","status":"active","shop_id":"30"}]}]}
答案 0 :(得分：0)
也许您的model_item为空？您需要使用调试模式来查找错误
答案 1 :(得分：0)
我发现了实际的问题。问题在这里
model_items.setImage(s1.getString("image"));
model_items.setShop_name(s1.getString("shop_name"));
在这一行中，您可以尝试从s1对象获取图像，但是在s1中没有image字段。这就是为什么它引发异常。
删除此行，然后重试。