I want to access an online API through an android application. For this purpose I have written easy to access functions to send requests via the android Volley package. However the app immediately displays 0s when I try to assign a value, that I have recieved through sending a request, to a TextView. I realize that this probably is because the function handles the Object as "null" because the response has not yet arrived and that I need to use AsyncTasks to handle this properly but the Developer Guide from Android Studio didn't really help me too much because, to be absolutely 100% honest with you, I'm not a software engineer and I'm absolutely lost at this point.
Here's some code on how I access the API:
org.json.JSONObject makeRequest(String URL, String method, String[] headers){
int reqType;
switch(method.toUpperCase()){
case "GET":
reqType = Request.Method.GET;
break;
case "DELETE":
reqType = Request.Method.DELETE;
break;
default:
return null;
}
Response.Listener<JSONObject> listener = new Response.Listener<JSONObject>(){
@Override
public void onResponse(JSONObject Response){
result = Response;
}
};
Response.ErrorListener err = new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
result = null;
}
};
JsonObjectRequest req = new JsonObjectRequest(reqType, URL, null, listener, err){
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
params.put(headers[0], headers[1]);
return params;
}
};
;
rQ_volley.add(req);
return result;
}
And additionally some code on where I access the method above
JSONArray koordTargetArr = rBuild.makeRequestArr("https://nominatim.openstreetmap.org/search?q="+target+"&format=json&polygon=1&addressdetails=1", "get",headersLonLat);
if(koordTargetArr != null) {
JSONObject koordTargetOBJ = koordTargetArr.getJSONObject(0);
koordTarget = koordTargetOBJ.getString("lon").concat(",").concat(koordTargetOBJ.getString("lat"));
}
else return 0;
I would appreciate any help you could give me on things like where I implement the AsyncTask and how I build one. I have experience in the async library in Node.js if that helps at all.
EDIT: This is NOT a duplicate of How to use java.net.URLConnection to fire and handle HTTP requests I already know how to send HTTP Requests, I don't know how to use android AsyncTask, HTTP Requests are NOT the topic of this question.
