Java 无法从ArrayList填充ListView
ChooseCategory.javaJava 无法从ArrayList填充ListView,java,android,json,listview,arraylist,Java,Android,Json,Listview,Arraylist,ChooseCategory.java public class ChooseCategory extends ListActivity { private ListView lv; //ArrayAdapter<FoodStores> arrayAdapter; private ArrayList<FoodStores> storefoodList; private
public class ChooseCategory extends ListActivity {
private ListView lv;
//ArrayAdapter<FoodStores> arrayAdapter;
private ArrayList<FoodStores> storefoodList;
private String URL_STORES = "http://10.0.2.2/get_stores.php";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
lv = (ListView)findViewById(R.id.list);
storefoodList = new ArrayList<FoodStores>();
new GetFoodStores().execute();
}
private class GetFoodStores extends AsyncTask<Void,Void,Void> {
@Override
protected void onPreExecute(){
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... arg0) {
ServiceHandlerFood jsonParserFood = new ServiceHandlerFood();
String json = jsonParserFood.makeServiceCall(URL_STORES, ServiceHandlerFood.GET);
Log.e("Response: ", " > " + json);
if(json != null){
try{
JSONObject jsonObj = new JSONObject(json);
if(jsonObj != null){
JSONArray storeListFood = jsonObj.getJSONArray("storelistfood");
for(int i = 0; i < storeListFood.length(); i++){
JSONObject storeFoodObj = (JSONObject) storeListFood.get(i);
FoodStores foodStores = new FoodStores(storeFoodObj.getInt("id"),storeFoodObj.getString("STORENAME"));
storefoodList.add(foodStores);
}
}
}catch(JSONException e){
e.printStackTrace();
}
}else{
Log.e("JSON Data", "No data received from server");
}
return null;
}
@Override
protected void onPostExecute(Void result){
super.onPostExecute(result);
populateListView();
}
}
喜欢
ArrayAdapter<String> listAdapter = new ArrayAdapter<String>(this,R.layout.restaurant_list,labels);
setListAdapter(listAdapter);
并确保您的ListView
id是android:id=“@android:id/list”
转到在从特定索引获取值之前,尝试检查storefoodList数据。
java.lang.NullPointerException
at call.rocket.user.callarocket.ChooseCategory.populateListView
ArrayAdapter<String> listAdapter = new ArrayAdapter<String>(this,R.layout.restaurant_list,labels);
setListAdapter(listAdapter);
lv = (ListView)findViewById(R.id.list);