Inside my Fragment onCreateView method I have call a method named getData() which has implemented to get some data as json response from server using android volley library.
getData() method :
public void getData(MyCustomListener<CompleteCartProItem> customListener) {
if (MyApplication.getAndroidSession().getAttribute("cart") != null) {
Log.i("cart_null", "NOT null");
RequestQueue requestQueue = VolleySingleton.getsInstance().getRequestQueue();
CartDetails cartDetails = (CartDetails) MyApplication.getAndroidSession().getAttribute("cart");
ArrayList<CartItem> jsonSendArray = cartDetails.getShoppingList();
final String jsonString = new Gson().toJson(jsonSendArray,
new TypeToken<ArrayList<CartItem>>() {
}.getType());
Log.i("json_object", jsonString);
String url = "http://10.0.2.2:8080/ECommerceApp/getAllProductsAction";
JsonArrayRequest arrayRequest = new JsonArrayRequest(Request.Method.GET, url,
response -> {
List<CompleteCartProItem> completeCart = new Gson().fromJson(response.toString(),
new TypeToken<List<CompleteCartProItem>>() {
}.getType());
Log.i("response", completeCart.get(0).getP_name());// successfully prints out the 0th product name.
customListener.onResponse(completeCart);
}, error -> Log.i("Volley_error", error.getMessage())) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("Content-Type", "application/json");
params.put("cartList", jsonString);
return params;
}
};
arrayRequest.setRetryPolicy(new RetryPolicy() {
@Override
public int getCurrentTimeout() {
return 5000;
}
@Override
public int getCurrentRetryCount() {
return 5000;
}
@Override
public void retry(VolleyError error) throws VolleyError {
}
});
requestQueue.add(arrayRequest);
} else {
Log.i("cart_null", "null");
}
}
Inside onCreateView :
...
getData(new MyCustomListener<CompleteCartProItem>() {
@Override
public void onResponse(List<CompleteCartProItem> response) {
completeCartProItems.addAll(response);
Log.i("executed", "Inside_onResponse");
Log.i("check", completeCartProItems.get(0).getP_name());
}
@Override
public void onError(String error_response) {
}
});
cart_item_scrollerAdapter = new CartItem_ScrollerAdapter(getActivity(), completeCartProItems);//completeCartProItems is an ArrayList of CompleteCartProItem (private List<CompleteCartProItem> completeCartProItems = new ArrayList<>();)
...
As you can see I m calling getData() before initializing the Adapter. But CartItem_ScrollerAdapter(...) constructor is calling before the getData() method here.
Constructor of CartItem_ScrollerAdapter(...) :
public CartItem_ScrollerAdapter(Context context, List<CompleteCartProItem> completeCartProItems) {
this.inflater = LayoutInflater.from(context);
this.context = context;
this.completeCartProItems = completeCartProItems;
Log.i("executed","Adapter");
}
As you can see Log.i("executed", "Inside_onResponse"); inside the getData() method is displays in the log cat after displaying the Log.i("executed","Adapter"); which is inside CartItem_ScrollerAdapter(...) . I havent initialize it anywhere before this. So that cause my completeCartProItems ArrayList passing to the constructor of CartItem_ScrollerAdapter(...) always empty.Any suggestions to get rid of this issue would be appreciable. Thank you.