AsyncTask Null pointer exception. Google Places - android-asynctask

i was developing app in android to get my nearby places and when i tried to run i made everything but got this exception and i do not know what is the reason to cause this exception. Please Helppp
LogCat
02-24 02:26:03.366: E/Trace(21173): error opening trace file: No such file or directory (2)
02-24 02:26:04.562: E/GooglePlayServicesUtil(21173): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
02-24 02:26:11.773: E/AndroidRuntime(21173): FATAL EXCEPTION: main
02-24 02:26:11.773: E/AndroidRuntime(21173): java.lang.NullPointerException
02-24 02:26:11.773: E/AndroidRuntime(21173): at com.appscourt.maps.places.near.me.MainActivity$ParserTask.onPostExecute(MainActivity.java:270)
02-24 02:26:11.773: E/AndroidRuntime(21173): at com.appscourt.maps.places.near.me.MainActivity$ParserTask.onPostExecute(MainActivity.java:1)
02-24 02:26:11.773: E/AndroidRuntime(21173): at android.os.AsyncTask.finish(AsyncTask.java:631)
02-24 02:26:11.773: E/AndroidRuntime(21173): at android.os.AsyncTask.access$600(AsyncTask.java:177)
02-24 02:26:11.773: E/AndroidRuntime(21173): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
02-24 02:26:11.773: E/AndroidRuntime(21173): at android.os.Handler.dispatchMessage(Handler.java:99)
02-24 02:26:11.773: E/AndroidRuntime(21173): at android.os.Looper.loop(Looper.java:137)
02-24 02:26:11.773: E/AndroidRuntime(21173): at android.app.ActivityThread.main(ActivityThread.java:5059)
02-24 02:26:11.773: E/AndroidRuntime(21173): at java.lang.reflect.Method.invokeNative(Native Method)
02-24 02:26:11.773: E/AndroidRuntime(21173): at java.lang.reflect.Method.invoke(Method.java:511)
02-24 02:26:11.773: E/AndroidRuntime(21173): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
02-24 02:26:11.773: E/AndroidRuntime(21173): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
02-24 02:26:11.773: E/AndroidRuntime(21173): at dalvik.system.NativeStart.main(Native Method)
MainActivity
public class MainActivity extends FragmentActivity implements LocationListener {
GoogleMap googleMap;
Spinner placeTypeSpinner;
String[] placeType = null;
String[] placeTypeName = null;
double latitude = 0;
double longitude = 0;
Button btnFind;
HashMap<String, String> mMarkerPlaceLink = new HashMap<String, String>();
#SuppressLint("NewApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Array of places type
placeType = getResources().getStringArray(R.array.place_type);
//Array of places type name
placeTypeName = getResources().getStringArray(R.array.place_type_name);
// Creating an array adapter with an array of Place types
// to populate the spinner
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, placeTypeName);
//Getting reference to the spinner
placeTypeSpinner = (Spinner)findViewById(R.id.spr_place_type);
//Setting adapter on spinner to set place types
placeTypeSpinner.setAdapter(adapter);
// Getting reference to Find Button
btnFind = ( Button ) findViewById(R.id.btnFind);
//Getting google play availability status
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext());
if(status != ConnectionResult.SUCCESS) {
int requestCode = 10;
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode);
dialog.show();
} else { //Google Play Services are available
//Getting reference to the SupportMapFragment
googleMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
.getMap();
googleMap.setMyLocationEnabled(true);
LocationManager locMan = (LocationManager) getSystemService(LOCATION_SERVICE);
// Creating a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Getting the name of the best provider
String provider = locMan.getBestProvider(criteria, true);
// Getting Current Location From GPS
Location location = locMan.getLastKnownLocation(provider);
if(location!=null){
onLocationChanged(location);
}
locMan.requestLocationUpdates(provider, 20000, 0, this);
googleMap.setOnInfoWindowClickListener(new OnInfoWindowClickListener() {
#Override
public void onInfoWindowClick(Marker marker) {
Intent intent = new Intent(getBaseContext(), PlaceDetailsActivity.class);
String reference = mMarkerPlaceLink.get(marker.getId());
intent.putExtra("reference", reference);
// Starting the Place Details Activity
startActivity(intent);
}
});
btnFind.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
int selectedPos = placeTypeSpinner.getSelectedItemPosition();
String type = placeType[selectedPos];
StringBuilder sb = new StringBuilder("https://maps.googleapis.com/maps/api/place/nearbysearch/json?");
sb.append("location=" + latitude + "," + longitude);
sb.append("&radius = 5000");
sb.append("&types = "+type);
sb.append("&sensor = true");
sb.append("&key = AIzaSyAbz9kNQKmgGRZJJj5fGcrp4DyfyvbxHm8");
// Creating a new non-ui thread task to download json data
PlacesTask placesTask = new PlacesTask();
// Invokes the "doInBackground()" method of the class PlaceTask
placesTask.execute(sb.toString());
}
});
}
//initializeMap();
}
/** A method to download json data from url */
String downloadUrl(String strUrl) throws IOException {
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try{
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while( ( line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
}catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}finally{
iStream.close();
urlConnection.disconnect();
}
return data;
}
#Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
latitude = location.getLatitude();
longitude = location.getLongitude();
LatLng latLng = new LatLng(latitude, longitude);
googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
googleMap.animateCamera(CameraUpdateFactory.zoomTo(12));
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
public class PlacesTask extends AsyncTask<String, Integer, String>{
String data = null;
//MainActivity mainActivity = new MainActivity();
// Invoked by execute() method of this object
#Override
protected String doInBackground(String... url) {
try {
data = downloadUrl(url[0]);
}catch (Exception e) {
Log.d("Background Task", e.toString());
}
return data;
}
#Override
protected void onPostExecute(String result) {
ParserTask parserTask= new ParserTask();
// Start parsing the Google places in JSON format
// Invokes the "doInBackground()" method of the class ParseTask
parserTask.execute(result);
}
}
public class ParserTask extends AsyncTask<String, Integer, List<HashMap<String,String>>>{
JSONObject jObject;
//MainActivity mainActivity = new MainActivity();
//GoogleMap gMap;
//Invoked by execute() method of this object
#Override
protected List<HashMap<String, String>> doInBackground(String... jsonData) {
List<HashMap<String, String>> places = null;
PlaceJSONParser placeJsonParser = new PlaceJSONParser();
try{
jObject = new JSONObject(jsonData[0]);
/** Getting the parsed data as a List construct */
places = placeJsonParser.parse(jObject);
}catch(Exception e){
Log.d("Exception",e.toString());
}
return places;
}
#Override
protected void onPostExecute(List<HashMap<String, String>> list) {
//Clear all existing markers
//gMap = mainActivity.googleMap;
googleMap.clear();
super.onPostExecute(list);
for(int i = 0 ; i < list.size() ; i++) {
MarkerOptions markerOptions = new MarkerOptions();
// Getting a place from the places list
HashMap<String, String> hmPlace = list.get(i);
// Getting latitude of the place
double lat = Double.parseDouble(hmPlace.get("lat"));
// Getting longitude of the place
double lng = Double.parseDouble(hmPlace.get("lng"));
// Getting name
String name = hmPlace.get("place_name");
// Getting vicinity
String vicinity = hmPlace.get("vicinity");
LatLng latLng = new LatLng(lat, lng);
// Setting the position for the marker
markerOptions.position(latLng);
// Setting the title for the marker.
//This will be displayed on taping the marker
markerOptions.title(name + " : " + vicinity);
// Placing a marker on the touched position
googleMap.addMarker(markerOptions);
}
}
}
}

I think you are using Google's places api using HTTP GET. Like https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=-33.8670522,151.1957362&radius=500&types=food&name=harbour&sensor=false&key=Your_key.
While using GET method, be careful about the white spaces. Inside your code, there are spaces on both sides of " = ". So format your StringBuilder without spaces and try again.
StringBuilder sb = new StringBuilder("https://maps.googleapis.com/maps/api/place/nearbysearch/json?");
sb.append("location=" + latitude + "," + longitude);
sb.append("&radius=5000"); // take care of spaces here
sb.append("&types="+type); //
sb.append("&sensor=true"); //
sb.append("&key=Your_KEY"); //
After building your url, Log it and copy-paste it inside a web browser to check it.

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DaftarCategories.java
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PostsBasedOnCategory.java
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setHasOptionsMenu(true);
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public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
swipeRefreshLayout =(SwipeRefreshLayout) getActivity().findViewById(R.id.swipeRefreshLayout);
recycleViewWordPress =(RecyclerView) getActivity().findViewById(R.id.recycleViewWordPress);
pb = (ProgressBar) getActivity().findViewById(R.id.loadingPanel);
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public void onRefresh() {
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recycleViewWordPress.setAdapter(mAdapter);
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mAdapter.notifyDataSetChanged();
loadData();
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public void loadData() {
Bundle bundel = this.getArguments();
long id = bundel.getLong("id");
String kategori = bundel.getString("kategori");
String title = bundel.getString("judul");
String excerpt = bundel.getString("excerpt");
String pict = bundel.getString("gambar");
String url = bundel.getString("url");
String konten = bundel.getString("konten");
CategoriesModel list = new CategoriesModel();
list.setId(id);
list.setCategory(kategori);
list.setJudul(title);
list.setExcerpt(excerpt);
list.setPostImg(pict);
list.setPostURL(url);
list.setContent(konten);
typeForPosts.add(list);
}
Logcat
2019-09-07 12:01:27.941 11246-11246/com.kursusarabic.arabicforfun D/postFrag: [{"id":12,"count":53,"description":"","link":"https:\/\/kisahmuslim.com\/category\/kisah-nyata\/biografi-ulama","name":"Biografi Ulama","slug":"biografi-ulama","taxonomy":"category","parent":29,"meta":[],"_links":{"self":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories\/12"}],"collection":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories"}],"about":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/taxonomies\/category"}],"up":[{"embeddable":true,"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories\/29"}],"wp:post_type":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/posts?categories=12"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}},{"id":26,"count":8,"description":"","link":"https:\/\/kisahmuslim.com\/category\/download","name":"Download","slug":"download","taxonomy":"category","parent":0,"meta":[],"_links":{"self":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories\/26"}],"collection":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories"}],"about":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/taxonomies\/category"}],"wp:post_type":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/posts?categories=26"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}},{"id":1812,"count":9,"description":"","link":"https:\/\/kisahmuslim.com\/category\/info","name":"Info","slug":"info","taxonomy":"category","parent":0,"meta":[],"_links":{"self":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories\/1812"}],"collection":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories"}],"about":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/taxonomies\/category"}],"wp:post_type":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/posts?categories=1812"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}},{"id":17,"count":3,"description":"","link":"https:\/\/kisahmuslim.com\/category\/kisah-nyata\/kisah-birrul-walidain","name":"Kisah Birrul Walidain","slug":"kisah-birrul-walidain","taxonomy":"category","parent":29,"meta":[],"_links":{"self":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories\/17"}],"collection":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories"}],"about":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/taxonomies\/category"}],"up":[{"embeddable":true,"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories\/29"}],"wp:post_type":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/posts?categories=17"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}},{"id":25,"count":31,"description":"","link":"https:\/\/kisahmuslim.com\/category\/kisah-nyata\/kisah-hidayah-islam","name":"Kisah Hidayah Islam","slug":"kisah-hidayah-islam","taxonomy":"category","parent":29,"meta":[],"_links":{"self":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories\/25"}],"collection":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories"}],"about":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/taxonomies\/category"}],"up":[{"embeddable":true,"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories\/29"}],"wp:post_type":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/posts?categories=25"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}},{"id":16,"count":49,"description":"","link":"https:\/\/kisahmuslim.com\/category\/kisah-nyata\/kisah-kaum-durhaka","name":"Kisah Kaum Durhaka","slug":"kisah-kaum-durhaka","taxonomy":"category","parent":29,"meta":[],"_links":{"self":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories\/16"}],"collection":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories"}],"about":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/taxonomies\/category"}],"up":[{"embeddable":true,"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories\/29"}],"wp:post_type":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/posts?categories=1
2019-09-07 12:01:27.942 11246-11246/com.kursusarabic.arabicforfun D/postFrag: Object at 0{"id":12,"count":53,"description":"","link":"https:\/\/kisahmuslim.com\/category\/kisah-nyata\/biografi-ulama","name":"Biografi Ulama","slug":"biografi-ulama","taxonomy":"category","parent":29,"meta":[],"_links":{"self":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories\/12"}],"collection":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories"}],"about":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/taxonomies\/category"}],"up":[{"embeddable":true,"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/categories\/29"}],"wp:post_type":[{"href":"https:\/\/kisahmuslim.com\/wp-json\/wp\/v2\/posts?categories=12"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
2019-09-07 12:01:27.942 11246-11246/com.kursusarabic.arabicforfun D/postFrag: https://kisahmuslim.com/wp-json/wp/v2/posts?categories=12
You cannot call network requests in loop, Use async processing or
Retrofit & RxJava multiple requests complete
and after updating typeForPosts, there is no need to setAdapter on recyclerview just call adapter.notifyDataSetChanged()

Okhttp parse and recyclerview fragment?

I've a issue on using a list_state out of the Okhttp, when I try to pass it in adapter it result empty.
I can't understand because all variables used inside onResponse do not be passed outside of it.
I've tried to set a recyclerview and adapter inside onResponse but got and error on it and ap crash.
The code I've used is below anyone can help me?.
Sorry for my English.
public class dashboard_device extends Fragment implements ListOwner{
RecyclerView mRecicleView;
RecyclerView.LayoutManager mLayoutManager;
RecyclerView.Adapter mAdapter;
ArrayList<String> lista_show;
ArrayList<String> lista_state = new ArrayList<String> ();
ArrayList<String> lista_prestate = new ArrayList<String> ();
String p,d;
String myResponse = null;
List<risposta_json> posts;
public dashboard_device() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, final ViewGroup container,
Bundle savedInstanceState) {
View fragmentView = inflater.inflate (R.layout.dashboard_device_layout, container, false);
final ArrayList<String> lista_show = new ArrayList<String> ();
dashboard_DB db1 = new dashboard_DB (getContext ());
//recupero datbase DB
db1.open();
Cursor c = db1.ottieniTuttidati();
if (c.moveToFirst()) {
do {
lista_show.add (c.getString(2));
} while (c.moveToNext());
}
db1.close();
//fine recupero dati da db
// Inflate the layout for this fragment
GestioneDB db = new GestioneDB(getContext ());
db.open();
Cursor c1 = db.ottieniTuttidati();
if (c1.moveToFirst()) {
do {
p = c1.getString(1);
d = c1.getString(2);
} while (c1.moveToNext());
}
db.close();
//fine recupero dati da db
final String url = p;
String token=d;
OkHttpClient client = new OkHttpClient ();
Request request = new Request.Builder()
.url("https://"+url+"/api/states")
.addHeader("Authorization", "Bearer " + token)
.build();
client.newCall(request).enqueue(new Callback () {
#Override
public void onFailure(Call call, IOException e) {e.printStackTrace();}
#Override
public void onResponse(Call call, Response response) throws IOException {
if (response.isSuccessful()) {
myResponse = response.body().string();
GsonBuilder gsonb = new GsonBuilder();
Gson gson = gsonb.create();
String jsonOutput = myResponse;
Type listType = new TypeToken<List<risposta_json>> (){}.getType();
posts = gson.fromJson(jsonOutput, listType);
// Log.d("MYRESPONSE", String.valueOf (myResponse));
//attributes = gson.fromJson (myResponse, risposta_json.class);
for (int i = 0; i<lista_show.size (); i++) {
for (int l = 0; l<posts.size ();l++) {
if (posts.get (l).getAttributes ().getFriendly_name ()!=null && posts.get (l).getAttributes ().getFriendly_name ().equalsIgnoreCase (lista_show.get (i))) {
lista_state.add (posts.get (l).getState ());
}
}
}
}
}
});
Log.d("STATI", String.valueOf (lista_state));
mRecicleView = container.findViewById (R.id.Reclycler_View);
mRecicleView.setHasFixedSize (true);
mLayoutManager = new GridLayoutManager (getContext (),3);
mAdapter = new adapter_dash (lista_show,lista_state, getContext (),dashboard_device.this);
mRecicleView.setLayoutManager (mLayoutManager);
mRecicleView.setAdapter (mAdapter);
runanimation1(mRecicleView,0);
Log.d("LISTA SHOW", String.valueOf (lista_show));
return fragmentView;
}
private void runanimation1(RecyclerView mRecicleView, int type) {
Context context=mRecicleView.getContext ();
LayoutAnimationController controller = null;
if(type==0)
controller = AnimationUtils.loadLayoutAnimation (context,R.anim.layout_animation);
mRecicleView.setLayoutAnimation (controller);
mRecicleView.getAdapter ().notifyDataSetChanged ();
mRecicleView.scheduleLayoutAnimation ();
}
#Override
public void push(ArrayList<String> list) {
}
}
Solved using
.getactivity().runOnUiThread (new Runnable) ect.... Ect...

Unable to access response data out of VolleyRequest, attempted callbacks

I have tried using callback similar to my fragments and other people suggestion on callbacks, However I've had no luck i could be doing the callbacks wrong. The Toast inside the onResponse method of JsonArrayRequest returns an array size of 2. But i get 0 on the toast outside of the request. consignment.class implements parcelable
public class BackgroundTask{
String json_url;
Gson gson;
Type listType;
ProgressDialog pDialog;
ArrayList<Consignment> arrayList = new ArrayList<>();
AppController appController;
ConsAdapter adapter;
Context context;
public BackgroundTask(Context context){
this.context = context;
listType = new TypeToken<List<Consignment>>(){}.getType();
appController = AppController.getInstance();
gson = new Gson();
}
public void getAllCons(final GetAllConsListener callBack) {
String tag_json_obj = "json_obj_req";
//showProgressDialog();
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Request.Method.GET, json_url,null,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
callBack.onSuccess(response.toString());
//hideProgressDialog();
Toast.makeText(context, "Consignments:"+arrayList.size(), Toast.LENGTH_LONG).show();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
//Toast.makeText(context, "Error...", Toast.LENGTH_SHORT).show();
error.printStackTrace();
//hideProgressDialog();
}
});
appController.addToRequestQueue(jsonArrayRequest);
}
Activity Class:
public class GetConsActivity extends AppCompatActivity {
RecyclerView recyclerView;
ConsAdapter adapter;
RecyclerView.LayoutManager layoutManager;
ArrayList<Consignment> arrayList;
TextView txtView;
BackgroundTask backgroundTask;
Type listType;
Gson gson;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_get_cons);
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setHasFixedSize(true);
gson = new Gson();
listType = new TypeToken<ArrayList<Consignment>>(){}.getType();
BackgroundTask backgroundTask = new BackgroundTask(GetConsActivity.this);
backgroundTask.getAllCons(new GetAllConsListener() {
#Override
public void onSuccess(String response) {
ArrayList<Consignment> list = parseResponse(response);
updateUI(list);
//Toast.makeText(GetConsActivity.this, "Consignments:"+arrayList.size(), Toast.LENGTH_LONG).show();
Log.d("ONSUCCESS", "ARRAYSIZE: "+arrayList.size());
}
});
}
public ArrayList<Consignment> parseResponse(String response){
ArrayList<Consignment> list = new ArrayList<>();
try {
JSONArray jsonArray = new JSONArray(response);
Log.d("PARSE", "parseResponse: "+jsonArray.length());
JSONObject jsonObject = jsonArray.getJSONObject(0);
for (int i = 0; i<jsonArray.length();i++){
Consignment con = null;
Log.d("PARSE", "parseID: "+jsonObject.getInt("conid"));
con.setConid(jsonObject.getInt("conid"));
Log.d("PARSE", "conID: "+con.getConid());
con.setDescription(jsonObject.getString("description"));
list.add(con);
}
Log.d("PARSED", "parsedResponse: "+list.size());
} catch (JSONException e) {
e.printStackTrace();
}
//arrayList =gson.fromJson(response,new TypeToken<ArrayList<Consignment>>(){}.getType());
//updateUI(arrayList);
return list;
}
public void updateUI(ArrayList<Consignment> consignments){
this.arrayList = consignments;
Log.d("UPDATE", "parseResponse: "+consignments.size());
if (adapter == null) {
adapter = new ConsAdapter(consignments,GetConsActivity.this);
recyclerView.setAdapter(adapter);
}else{
adapter.setConsignments(consignments);
adapter.notifyDataSetChanged();
}
}
Error:
D/mali_winsys: EGLint new_window_surface(egl_winsys_display*, void*, EGLSurface, EGLConfig, egl_winsys_surface**, egl_color_buffer_format*, EGLBoolean) returns 0x3000, [1440x2560]-format:1
E/RecyclerView: No adapter attached; skipping layout
I/qtaguid: Untagging socket 51
D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 84 - 0, 0) vi=Rect(0, 84 - 0, 0) or=1
E/RecyclerView: No adapter attached; skipping layout
D/PARSE: parseResponse: 4
D/PARSE: parseID: 123456789
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.angel.createcon, PID: 26952
java.lang.NullPointerException: Attempt to invoke virtual method 'void com.angel.createcon.Consignment.setConid(int)' on a null object reference
at com.angel.createcon.GetConsActivity.parseResponse(GetConsActivity.java:80)
at com.angel.createcon.GetConsActivity$2.onSuccess(GetConsActivity.java:56)
at com.angel.createcon.BackgroundTask$2.onResponse(BackgroundTask.java:50)
at com.angel.createcon.BackgroundTask$2.onResponse(BackgroundTask.java:47)
at com.android.volley.toolbox.JsonRequest.deliverResponse(JsonRequest.java:65)
at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7331)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
I/Process: Sending signal. PID: 26952 SIG: 9
Application terminated.
So I'll take a stab at this - having the activity implement the listener that way is a bit strange, though I don't think that's the issue. I also don't understand why you chose to save the list type to a variable - I've not seen anyone do that before.
However, getting to your question about the toast and why it's 0 - If you're talking about the toast that comes after the getAllCons call -it's because that code is executed before the callback code. completes.
Try something like this and see what it does.
public class BackgroundTask{
String json_url;
Gson gson;
Type listType;
Context context;
public BackgroundTask(Context context){
this.context = context;
listType = new TypeToken<List<Consignment>>(){}.getType();
appController = AppController.getInstance();
gson = new Gson();
}
public void getAllCons(final GetAllConsListener callBack) {
String tag_json_obj = "json_obj_req";
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Request.Method.GET, json_url,null,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
callBack.onSuccess(response.toString());
Toast.makeText(context, "Consignments:"+arrayList.size(), Toast.LENGTH_LONG).show();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
appController.addToRequestQueue(jsonArrayRequest);
}
public class GetConsActivity extends AppCompatActivity {
RecyclerView recyclerView;
ConsAdapter adapter;
RecyclerView.LayoutManager layoutManager;
TextView txtView;
BackgroundTask backgroundTask;
Gson gson;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_get_cons);
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setHasFixedSize(true);
gson = new Gson();
BackgroundTask backgroundTask = new BackgroundTask(GetConsActivity.this);
backgroundTask.getAllCons(new GetAllConsListener() {
#Override
public void onSuccess(String response) {
List<Consignment> values = parseResponse(response);
updateUI(values);
}
});
//code may execute here but callback is not yet complete.
}
public List<Consignment> parseResponse(String response){
return gson.fromJson(response,listType);
}
private void updateUI(List<Consignment> consignments){
if(adapter == null){
adapter = new ConsAdapter(consignments)
recyclerView.setAdapter(adapter);
} else {
adapter.consignments = consignments;
adapter.notifyDataSetChanged();
}
}

java.lang.NullPointerException in textview inside asyncTask

If I use the following code, I will have no error, but there will be a freeze time.
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
setContentView(R.layout.profilepic);
initialize();
Bundle bundle = getIntent().getExtras();
email = bundle.getString("Email");
ArrayList<NameValuePair> postParameters;
String response = null;
postParameters = new ArrayList<NameValuePair>();
postParameters.add(new BasicNameValuePair("emaillog", email));
try {
response = CustomHttpClient.executeHttpPost("http://whatstherex.info/checkU.php", postParameters);
res = response.toString();
res = res.replaceAll("null", "");
username = res.toString();
tvProfilePic.setText("Hi " + username + ", you are encourage to add a profile picture.");
}catch(Exception e){
res = e.toString();
tvProfilePic.setText(res);
}
}
But if I use this code with asyncTask and progressDialog like this:
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
setContentView(R.layout.profilepic);
initialize();
getUsername();
}
private AsyncTask<String, Void, String> task;
public void getUsername(){
Bundle bundle = getIntent().getExtras();
email = bundle.getString("Email");
task = new AsyncTask<String, Void, String>() {
ProgressDialog dialog;
ArrayList<NameValuePair> postParameters;
String response = null;
#Override
protected void onPreExecute() {
//
ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
postParameters.add(new BasicNameValuePair("emaillog", email));
dialog = new ProgressDialog(Profilepic.this, ProgressDialog.STYLE_SPINNER);
dialog.setMessage("Loading Data...");
dialog.show();
}
#Override
protected String doInBackground(String... params) {
//
try {
response = CustomHttpClient.executeHttpPost("http://whatstherex.info/checkU.php", postParameters);
res = response.toString();
res = res.replaceAll("null", "");
username = res.toString();
return username;
}catch(Exception e){
res = e.toString();
return res;
}
}
#Override
protected void onPostExecute(String result) {
if(result.length()< 25){
username = result;
tvProfilePic.setText("Hi " + result + ", you are encourage to add a profile picture.");
dialog.dismiss();
}else{
tvProfilePic.setText(result);
dialog.dismiss();
}
}
};
task.execute();
}
I get java.lang.NullPointerException in the textview.
What's the problem? Can anyone help me how to resolve this issue with NullPointerException appearing?
I see that you use tvProfilePic but I don't see where you define it.
In case you are not defining it, it should be done in a similar way as
tvProfilePic = findViewById(R.id.profile_pic)
Are you doing this?
Note that 'profile_pic' is the name in the layout XML document.
You are using tvProfilePic as a textview but i can't see where you defined it.
if you are not defining it then define it using something like
tvProfilePic = findViewById(R.id.profile_pic)
You are getting nullpointerexception because your tvProfilePic is null

Resources