I know there are some identical questions but I just couldn't figure out what I'm doing wrong.
public class MainActivity extends AppCompatActivity {
...
@Override
protected void onCreate(Bundle savedInstanceState) {
...
new JsonHandler().execute(this, collection, gridArray, customGridAdapter);
...
}
}
So in my main activity I need to query an API which gives back JSON and I have to process that to build my database.
Then in doInBackground() I call getAllCards() which gets the first JSON. Because the JSON includes URLs for more JSON requests, I have a few methods each querying a more detailed JSON.
public final class JsonHandler extends AsyncTask {
private final String urlCards = "https://api.gwentapi.com/v0/cards/";
private final String urlSpecificCard = "https://api.gwentapi.com/v0/cards/:id";
private Context context;
private Collection collection;
private ArrayList<Card> gridArray;
private CustomGridViewAdapter customGridAdapter;
public JsonHandler(Context context, Collection collection, ArrayList<Card> gridArray, CustomGridViewAdapter customGridAdapter){
this.context = context;
this.collection = collection;
this.gridArray = gridArray;
this.customGridAdapter = customGridAdapter;
}
public JsonHandler(){
this.context = null;
this.collection = null;
this.gridArray = null;
this.customGridAdapter = null;
}
private void getAllCards() throws RuntimeException {
JsonObjectRequest arrayRequest = new JsonObjectRequest(Request.Method.GET, urlCards, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
generateCollection(response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError e) {
throw new RuntimeException(e.getMessage());
}
});
Volley.newRequestQueue(context).add(arrayRequest);
}
private void getSpecificCard(final String cardURL) throws RuntimeException {
JsonObjectRequest arrayRequest = new JsonObjectRequest(Request.Method.GET, cardURL, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
processCard(response, collection);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError e) {
throw new RuntimeException(e.getMessage());
}
});
Volley.newRequestQueue(context).add(arrayRequest);
}
private void generateCollection(JSONObject response) throws RuntimeException {
try {
JSONArray array = response.getJSONArray("results");
for(int i = 0; i < array.length();i++){
JSONObject object = array.getJSONObject(i);
String cardURL = object.getString("href");
getSpecificCard(cardURL);
}
} catch (Exception e) {
throw new RuntimeException(e.getMessage());
}
}
private void processCard(JSONObject response, Collection collection){
try {
String id = response.getString("id");
EnumFaction faction = EnumFaction.valueOf(response.getJSONObject("faction").getString("name").toUpperCase());
EnumType type = null;
EnumRarity rarity = null;
EnumLane lane = null;
EnumLoyalty loyalty = null;
String name = response.getString("name");
String text = response.getString("text");
String imagePath = "https://api.gwentapi.com/media/\" + id + \"_small.png";
URL url = new URL(imagePath);
InputStream inputStream = url.openConnection().getInputStream();
Bitmap image = BitmapFactory.decodeStream(inputStream);
Card card = new Card(id, faction, type, rarity, lane, loyalty, name, text, null, imagePath, 0);
collection.addCard(card);
gridArray.add(card);
customGridAdapter.notifyDataSetChanged();
} catch (Exception e){
throw new RuntimeException(e.getMessage());
}
}
@Override
protected Object doInBackground(Object[] params) {
context = (Context) params[0];
collection = (Collection) params[1];
gridArray = (ArrayList<Card>) params[2];
customGridAdapter = (CustomGridViewAdapter) params[3];
getAllCards();
return null;
}
}
So now on to the problem:
When the programm reaches processCard() when I've gathered enough information, I get a NetworkOnMainThreadException when I create the InputStream.
I've tried so many different methods to get a Bitmap from my URL and different methods to do an asynchronous task - all leading to the same result.
If you could show me how to resolve this issue, I'd be sooo happy.
Edit: Since it got marked as duplicate: I AM USING ASYNCTASK! I have looked at many questions and tried what they did there, it doesn't work!
