null pointer exception in async task [duplicate] - java

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What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 4 years ago.
when i tried to put direction from source to destination on map
this null pointer exception heppen
when i tried to put direction from source to destination on map
this null pointer exception heppen
l
ocat:
07-05 02:19:21.569 23133-23133/com.example.saad.testapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.saad.testapp, PID: 23133
java.lang.NullPointerException
at com.example.saad.testapp.map$TaskParser.onPostExecute(map.java:248)
at com.example.saad.testapp.map$TaskParser.onPostExecute(map.java:205)
at android.os.AsyncTask.finish(AsyncTask.java:632)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5511)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
map.class is as follows :
public class map extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
loc ambLoc;
loc patLoc;
String tempE;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
ambLoc=new loc();
patLoc=new loc();
tempE=new String();
}
#Override
public void onMapReady(GoogleMap googleMap) {
getPoints();
}
void getPoints()
{
//some code here
String url=getRequestUrl(ambLoc,patLoc);
TaskRequestDirections taskRequestDirections = new TaskRequestDirections();
taskRequestDirections.execute(url);
}
private String getRequestUrl(loc origin, loc dest) {
//Value of origin
String str_org = "origin=" + origin.getLatitude() +","+origin.getLongitude();
//Value of destination
String str_dest = "destination=" + dest.getLatitude()+","+dest.getLongitude();
//Set value enable the sensor
String sensor = "sensor=false";
//Mode for find direction
String mode = "mode=driving";
//Build the full param
String param = str_org +"&" + str_dest + "&" +sensor+"&" +mode;
//Output format
String output = "json";
//Create url to request
String url = "https://maps.googleapis.com/maps/api/directions/" + output + "?" + param;
return url;
}
private String requestDirection(String reqUrl) throws IOException {
String responseString = "";
InputStream inputStream = null;
HttpURLConnection httpURLConnection = null;
try{
URL url = new URL(reqUrl);
httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.connect();
//Get the response result
inputStream = httpURLConnection.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
StringBuffer stringBuffer = new StringBuffer();
String line = "";
while ((line = bufferedReader.readLine()) != null) {
stringBuffer.append(line);
}
responseString = stringBuffer.toString();
bufferedReader.close();
inputStreamReader.close();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (inputStream != null) {
inputStream.close();
}
httpURLConnection.disconnect();
}
return responseString;
}
public class TaskRequestDirections extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... strings) {
String responseString = "";
try {
responseString = requestDirection(strings[0]);
} catch (IOException e) {
e.printStackTrace();
}
return responseString;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
//Parse json here
TaskParser taskParser = new TaskParser();
taskParser.execute(s);
}
}
having exception on the below line
public class TaskParser extends AsyncTask<String, Void, List<List<HashMap<String, String>>> > {
#Override
protected List<List<HashMap<String, String>>> doInBackground(String... strings) {
JSONObject jsonObject = null;
List<List<HashMap<String, String>>> routes = null;
try {
jsonObject = new JSONObject(strings[0]);
DirectionParser directionsParser = new DirectionParser();
routes = directionsParser.parse(jsonObject);
} catch (JSONException e) {
e.printStackTrace();
}
return routes;
}
#Override
protected void onPostExecute(List<List<HashMap<String, String>>> lists) {
//Get list route and display it into the map
ArrayList points = null;
PolylineOptions polylineOptions = null;
for (List<HashMap<String, String>> path : lists) {
points = new ArrayList();
polylineOptions = new PolylineOptions();
for (HashMap<String, String> point : path) {
double lat = Double.parseDouble(point.get("lat"));
double lon = Double.parseDouble(point.get("lon"));
points.add(new LatLng(lat,lon));
}
polylineOptions.addAll(points);
polylineOptions.width(15);
polylineOptions.color(Color.BLUE);
polylineOptions.geodesic(true);
}
if (polylineOptions!=null) {
Toast.makeText(getApplicationContext(), "adding polyline!", Toast.LENGTH_SHORT).show();
having exception on the
mMap.addPolyline(polylineOptions);
} else {
Toast.makeText(getApplicationContext(), "Direction not found!", Toast.LENGTH_SHORT).show();
}
}
}
}
suggest any solution if you have
thank you
thank you
thank you
thank you


You never set mMap variable try like this
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
getPoints();
}

Related

I want to show markers from json file

markers don't show on map and i don't understand error
My json file:[
{
"name": "aaaa",
"lat": 35.747394,
"lang": 51.267577
}
]
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
List<Position> positionsList = new ArrayList<>();
ProgressDialog progressDialog;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
//delete if static
PositionsTask positionsTask = new PositionsTask();
positionsTask.execute();
// end delete
// positionsList.add(new Position("beb souika",1,1));
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
LatLng TUNIS = new LatLng(36.818248, 10.182416);
for(Position pos: positionsList){
LatLng latLng = new LatLng(pos.getLatitude(),pos.getLongitude());
if(mMap!=null){
mMap.addMarker(new MarkerOptions().position(latLng).title(pos.getName()));
}
}
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(TUNIS,11));
}
private class PositionsTask extends AsyncTask<Void, Void, Void> {
private static final String TAG_ID = "id";
private static final String TAG_NAME = "name";
private static final String TAG_LATITUDE = "latitude";
private static final String TAG_lONGITUDE = "longitude";
#Override
protected void onPreExecute(){
progressDialog = new ProgressDialog(MapsActivity.this);
progressDialog.setMessage("Chargement en cours ...");
progressDialog.show();
}
#Override
protected Void doInBackground(Void... params) {
String link;
BufferedReader bufferedReader;
String result="[]";
try {
link = "http://192.168.8.105/map1.php";
URL url = new URL(link);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String line = null;
StringBuilder sb = new StringBuilder() ;
while ((line = bufferedReader.readLine()) != null)
{
sb.append(line + "\n");
}
result = sb.toString();
} catch (Exception e) {
Log.e("Exception: ",e.getMessage());
}
positionsList = getPositionList(result);
return null;
}
#Override
protected void onPostExecute(Void params) {
progressDialog.dismiss();
}
#Override
protected void onCancelled() {
progressDialog.dismiss();
}
protected List getPositionList(String myJSON){
List<Position> positions = new ArrayList<>();
try {
JSONArray data = new JSONArray(myJSON);
for(int i=0;i<data.length();i++){
Position position = new Position();
JSONObject json = data.getJSONObject(i);
position.setId(json.getInt(TAG_ID));
position.setName(json.getString(TAG_NAME));
position.setLatitude(json.getDouble(TAG_LATITUDE));
position.setLongitude(json.getDouble(TAG_lONGITUDE));
positions.add(position);
}
} catch (JSONException e) {
e.printStackTrace();
}
return positions;
}
}
}
04-23 21:33:16.491 2567-3598/? E/Parcel: Class not found when unmarshalling: com.facebook.search.api.GraphSearchQuery
java.lang.ClassNotFoundException: com.facebook.search.api.GraphSearchQuery
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:324)
at android.os.Parcel.readParcelableCreator(Parcel.java:2404)
at android.os.Parcel.readParcelable(Parcel.java:2358)
at android.os.Parcel.readValue(Parcel.java:2264)
at android.os.Parcel.readArrayMapInternal(Parcel.java:2614)
at android.os.BaseBundle.unparcel(BaseBundle.java:221)
at android.os.BaseBundle.getString(BaseBundle.java:920)
at android.content.Intent.getStringExtra(Intent.java:6221)
at com.android.server.am.ActivityStackSupervisor.startActivityLocked(ActivityStackSupervisor.java:2751)
at com.android.server.am.ActivityStackSupervisor.startActivityMayWait(ActivityStackSupervisor.java:2209)
at com.android.server.am.ActivityManagerService.startActivityAsUser(ActivityManagerService.java:6591)
at com.android.server.am.ActivityManagerService.startActivity(ActivityManagerService.java:6346)
at android.app.ActivityManagerNative.onTransact(ActivityManagerNative.java:170)
at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:4166)
at android.os.Binder.execTransact(Binder.java:453)
Caused by: java.lang.ClassNotFoundException: com.facebook.search.api.GraphSearchQuery
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at java.lang.Class.classForName(Native Method) 
at java.lang.Class.forName(Class.java:324) 
at android.os.Parcel.readParcelableCreator(Parcel.java:2404) 
at android.os.Parcel.readParcelable(Parcel.java:2358) 
at android.os.Parcel.readValue(Parcel.java:2264) 
at android.os.Parcel.readArrayMapInternal(Parcel.java:2614) 
at android.os.BaseBundle.unparcel(BaseBundle.java:221) 
at android.os.BaseBundle.getString(BaseBundle.java:920) 
at android.content.Intent.getStringExtra(Intent.java:6221) 
at com.android.server.am.ActivityStackSupervisor.startActivityLocked(ActivityStackSupervisor.java:2751) 
at com.android.server.am.ActivityStackSupervisor.startActivityMayWait(ActivityStackSupervisor.java:2209) 
at com.android.server.am.ActivityManagerService.startActivityAsUser(ActivityManagerService.java:6591) 
at com.android.server.am.ActivityManagerService.startActivity(ActivityManagerService.java:6346) 
at android.app.ActivityManagerNative.onTransact(ActivityManagerNative.java:170) 
at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:4166) 
at android.os.Binder.execTransact(Binder.java:453) 
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available

I want to get marker from json

the error is "Error connecting to service"
public class MarkerTask extends AsyncTask<Void, Void, String>
{
private static final String LOG_TAG = "ExampleApp";
private static final String SERVICE_URL = "https://192.168.8.103/map1.php";
private GoogleMap mMap;
// Invoked by execute() method of this object
#Override
protected String doInBackground(Void... args) {
HttpURLConnection conn = null;
final StringBuilder json = new StringBuilder();
try {
// Connect to the web service
URL url = new URL(SERVICE_URL);
conn = (HttpURLConnection) url.openConnection();
InputStreamReader in = new InputStreamReader(conn.getInputStream());
// Read the JSON data into the StringBuilder
int read;
char[] buff = new char[1024];
while ((read = in.read(buff)) != -1) {
json.append(buff, 0, read);
}
} catch (IOException e) {
Log.e(LOG_TAG, "Error connecting to service", e);
//throw new IOException("Error connecting to service", e); //uncaught
} finally {
if (conn != null) {
conn.disconnect();
}
}
return json.toString();
}
// Executed after the complete execution of doInBackground() method
#Override
protected void onPostExecute(String json) {
try {
// De-serialize the JSON string into an array of city objects
JSONArray jsonArray = new JSONArray(json);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObj = jsonArray.getJSONObject(i);
LatLng latLng = new LatLng(jsonObj.getJSONArray("marker").getDouble(0),
jsonObj.getJSONArray("marker").getDouble(1));
//move CameraPosition on first result
if (i == 0) {
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(latLng).zoom(13).build();
mMap.animateCamera(CameraUpdateFactory
.newCameraPosition(cameraPosition));
}
// Create a marker for each city in the JSON data.
mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE))
.title(jsonObj.getString("name"))
.snippet(Integer.toString(jsonObj.getInt("population")))
.position(latLng));
}
} catch (JSONException e) {
Log.e(LOG_TAG, "Error processing JSON", e);
}
}
}
My map Activity
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
if (mapFragment != null) {
//setUpMap();
new MarkerTask().execute();
}
}}

Getting java.lang.RunTimeException when running on Background in ANDROID

I am calling an Activity called MapsActivity from a Fragment.
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
rootView = inflater.inflate(R.layout.fragment_one, container, false);
ibTrackEmp = (ImageView)rootView.findViewById(R.id.ibTrackEmp);
ibTrackEmp.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(), MapsActivity.class);
startActivity(intent);
}
});
return rootView;
}
Now, in the MapsActivity.java, i call a Web Service as a BackGround Task
private class GetALLGPSTask extends AsyncTask<String, Void, String> {
private TextView textView;
public GetALLGPSTask() {
}
#Override
protected String doInBackground(String... strings) {
String result = "Unable to fetch from SAP";
try {
URL url = new URL(strings[0]);
final String basicAuth = "Basic " + Base64.encodeToString("xxxx:xxxx#1223".getBytes(), Base64.NO_WRAP);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setReadTimeout(90000);
urlConnection.setConnectTimeout(55000);
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
urlConnection.setRequestProperty ("Authorization", basicAuth);
InputStream stream = new BufferedInputStream(urlConnection.getInputStream());
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(stream));
StringBuilder builder = new StringBuilder();
String inputString;
while ((inputString = bufferedReader.readLine()) != null) {
builder.append(inputString);
}
int responsecode = urlConnection.getResponseCode();
Log.d("ResponseCode", String.valueOf(responsecode));
if(responsecode == 200){
result = "GPS Coordinates Updated Successfully";
try {
JSONArray jsonArray = new JSONArray(builder.toString());
List<Pair<String, String>> allNames = new ArrayList<>();
final int numberOfItemsInResp = jsonArray.length();
for (int i = 0; i < numberOfItemsInResp; i++) {
JSONObject jobj = jsonArray.getJSONObject(i);
String name = jobj.getString("NAME");
String addlatitude = jobj.getString("LATITUDE");
String addlongitude = jobj.getString("LONGITUDE");
LatLng newemp = new LatLng(Double.valueOf(addlatitude), Double.valueOf(addlongitude));
mMap.addMarker(new MarkerOptions().position(newemp).title("UserName: "+name));
}
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
}
urlConnection.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
#Override
protected void onPostExecute(String temp) {
Toast.makeText(MapsActivity.this,
temp, Toast.LENGTH_SHORT).show();
}
Here, the Web Service is getting called, but the app initializes to the first screen.
I get the following error log
--------- beginning of crash
09-27 15:52:31.912 31508-31767/com.example.sd0003.appslider E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #2
Process: com.example.sd0003.appslider, PID: 31508
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:309)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.IllegalStateException: Not on the main thread
at maps.w.d.a(Unknown Source)
at maps.y.F.a(Unknown Source)
at maps.ad.t.a(Unknown Source)
at ua.onTransact(:com.google.android.gms.DynamiteModulesB:167)
at android.os.Binder.transact(Binder.java:392)
at com.google.android.gms.maps.internal.IGoogleMapDelegate$zza$zza.addMarker(Unknown Source)
at com.google.android.gms.maps.GoogleMap.addMarker(Unknown Source)
at com.example.sd0003.appslider.MapsActivity$GetALLGPSTask.doInBackground(MapsActivity.java:152)
at com.example.sd0003.appslider.MapsActivity$GetALLGPSTask.doInBackground(MapsActivity.java:105)
at android.os.AsyncTask$2.call(AsyncTask.java:295)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
at java.lang.Thread.run(Thread.java:818) 
09-27 15:52:31.912 31508-31767/com.example.sd0003.appslider E/AbstractTracker: Can't create handler inside thread that has not called Looper.prepare()
09-27 15:52:31.913 31508-31767/com.example.sd0003.appslider D/AppTracker: App Event: crash
09-27 15:52:31.916 31508-31767/com.example.sd0003.appslider E/AbstractTracker: mTrackerAsyncQueryHandler is null
09-27 15:52:31.942 31508-31767/com.example.sd0003.appslider I/Process: Sending signal. PID: 31508 SIG: 9

You should not be performing UI updates from a background thread. In this particular case, you should not be adding markers to your mMap reference.
Instead, you should return a list of location names and latitude/longitude pairs and handle updating the UI from the main thread in onPostExecute. Think about returning a dataset that resembles something like List<Pair<String, LatLng>> locations.
Your implementation would then look like this:
private class GetALLGPSTask extends AsyncTask<String, Void, List<Pair<String, LatLng>>> {
private TextView textView;
public GetALLGPSTask() {
}
#Override
protected List<Pair<String, LatLng>> doInBackground(String... strings) {
List<Pair<String, LatLng>> allLocations = new ArrayList<>();
try {
URL url = new URL(strings[0]);
final String basicAuth = "Basic " + Base64.encodeToString("xxxx:xxxx#1223".getBytes(), Base64.NO_WRAP);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setReadTimeout(90000);
urlConnection.setConnectTimeout(55000);
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
urlConnection.setRequestProperty ("Authorization", basicAuth);
InputStream stream = new BufferedInputStream(urlConnection.getInputStream());
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(stream));
StringBuilder builder = new StringBuilder();
String inputString;
while ((inputString = bufferedReader.readLine()) != null) {
builder.append(inputString);
}
int responsecode = urlConnection.getResponseCode();
Log.d("ResponseCode", String.valueOf(responsecode));
if(responsecode == 200){
try {
JSONArray jsonArray = new JSONArray(builder.toString());
final int numberOfItemsInResp = jsonArray.length();
for (int i = 0; i < numberOfItemsInResp; i++) {
JSONObject jobj = jsonArray.getJSONObject(i);
String name = jobj.getString("NAME");
String latitude = jobj.getString("LATITUDE");
String longitude = jobj.getString("LONGITUDE");
LatLng latLng = new LatLng(Double.valueOf(addlatitude), Double.valueOf(addlongitude));
allLocations.add(new Pair<>(name, latLng))
}
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
}
urlConnection.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
return allLocations;
}
#Override
protected void onPostExecute(List<Pair<String, LatLng>> locations) {
for (Pair<String, LatLng> location : locations) {
mMap.addMarker(new MarkerOptions().position(location.second).title("UserName: " + location.first));
}
}
}
Side note: Your allNames list was never used.

getMapAsync error - Google maps api android

So Im trying to display markers on my map from a Jsonfile and they are not appearing Ive narrowed it down to the line
map = mapFragment.getMapAsync(this);
it gives me the error
Incompatible types:
Required: com.google.android.gms.maps.GoogleMap Found: Void
Here is the rest of the code:
public class MainActivity extends FragmentActivity implements OnMapReadyCallback {
private static final String LOG_TAG = "ExampleApp";
private static final String SERVICE_URL = "https://api.myjson.com/bins/4jb09";
protected GoogleMap map;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setUpMapIfNeeded();
}
#Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
if (map == null) {
MapFragment mapFragment = (MapFragment) getFragmentManager()
.findFragmentById(R.id.map);
map = mapFragment.getMapAsync(this);
if (map != null) {
//setUpMap();
new MarkerTask().execute();
}
}
}
#Override
public void onMapReady(GoogleMap googleMap) {
map = googleMap;
setUpMap();
}
private void setUpMap() {
// Retrieve the city data from the web service
// In a worker thread since it's a network operation.
new Thread(new Runnable() {
public void run() {
try {
retrieveAndAddCities();
} catch (IOException e) {
Log.e(LOG_TAG, "Cannot retrive cities", e);
return;
}
}
}).start();
}
protected void retrieveAndAddCities() throws IOException {
HttpURLConnection conn = null;
final StringBuilder json = new StringBuilder();
try {
// Connect to the web service
URL url = new URL(SERVICE_URL);
conn = (HttpURLConnection) url.openConnection();
InputStreamReader in = new InputStreamReader(conn.getInputStream());
// Read the JSON data into the StringBuilder
int read;
char[] buff = new char[1024];
while ((read = in.read(buff)) != -1) {
json.append(buff, 0, read);
}
} catch (IOException e) {
Log.e(LOG_TAG, "Error connecting to service", e);
throw new IOException("Error connecting to service", e);
} finally {
if (conn != null) {
conn.disconnect();
}
}
// Create markers for the city data.
// Must run this on the UI thread since it's a UI operation.
runOnUiThread(new Runnable() {
public void run() {
try {
createMarkersFromJson(json.toString());
} catch (JSONException e) {
Log.e(LOG_TAG, "Error processing JSON", e);
}
}
});
}
void createMarkersFromJson(String json) throws JSONException {
// De-serialize the JSON string into an array of city objects
JSONArray jsonArray = new JSONArray(json);
for (int i = 0; i < jsonArray.length(); i++) {
// Create a marker for each city in the JSON data.
JSONObject jsonObj = jsonArray.getJSONObject(i);
map.addMarker(new MarkerOptions()
.title(jsonObj.getString("name"))
.snippet(Integer.toString(jsonObj.getInt("population")))
.position(new LatLng(
jsonObj.getJSONArray("latlng").getDouble(0),
jsonObj.getJSONArray("latlng").getDouble(1)
))
);
}
}
private class MarkerTask extends AsyncTask<Void, Void, String> {
private static final String LOG_TAG = "ExampleApp";
private static final String SERVICE_URL = "https://api.myjson.com/bins/4jb09";
// Invoked by execute() method of this object
#Override
protected String doInBackground(Void... args) {
HttpURLConnection conn = null;
final StringBuilder json = new StringBuilder();
try {
// Connect to the web service
URL url = new URL(SERVICE_URL);
conn = (HttpURLConnection) url.openConnection();
InputStreamReader in = new InputStreamReader(conn.getInputStream());
// Read the JSON data into the StringBuilder
int read;
char[] buff = new char[1024];
while ((read = in.read(buff)) != -1) {
json.append(buff, 0, read);
}
} catch (IOException e) {
Log.e(LOG_TAG, "Error connecting to service", e);
//throw new IOException("Error connecting to service", e); //uncaught
} finally {
if (conn != null) {
conn.disconnect();
}
}
return json.toString();
}
// Executed after the complete execution of doInBackground() method
#Override
protected void onPostExecute(String json) {
try {
// De-serialize the JSON string into an array of city objects
JSONArray jsonArray = new JSONArray(json);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObj = jsonArray.getJSONObject(i);
LatLng latLng = new LatLng(jsonObj.getJSONArray("latlng").getDouble(0),
jsonObj.getJSONArray("latlng").getDouble(1));
//move CameraPosition on first result
if (i == 0) {
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(latLng).zoom(13).build();
map.animateCamera(CameraUpdateFactory
.newCameraPosition(cameraPosition));
}
// Create a marker for each city in the JSON data.
map.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE))
.title(jsonObj.getString("name"))
.snippet(Integer.toString(jsonObj.getInt("population")))
.position(latLng));
}
} catch (JSONException e) {
Log.e(LOG_TAG, "Error processing JSON", e);
}
}
}
}

Change it to
map.getMapAsync(this);
instead of
map = mapFragment.getMapAsync(this);
because
#Override
public void onMapReady(GoogleMap googleMap) {
this.googleMap = googleMap;
}
return type of this method is void, so it will not return anything.
You have to do this:
map.getMapAsync(this)

mapFragment.getMapAsync(this); has return type Void
Change your setUpMapIfNeeded() to following one
private void setUpMapIfNeeded() {
if (map == null) {
MapFragment mapFragment = (MapFragment) getFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
}
Do the marker setting work in onMapReady().

Use SupportMapFragment instead of MapFragment.You can take help from following code sample.
Define MapFragment as :
private SupportMapFragment supportMapFragment;
GoogleMap mGoogleMap; //for google map
And in your activity creation, you can do like this:
if(supportMapFragment==null){
supportMapFragment = (SupportMapFragment)getChildFragmentManager().findFragmentById(R.id.map);
supportMapFragment.getMapAsync(new OnMapReadyCallback() {
#Override
public void onMapReady(GoogleMap googleMap) {
mGoogleMap = googleMap;
//do load your map and other map stuffs here...
}
});
hope this will help you ...

Your code is returning this error Incompatible types: Required: com.google.android.gms.maps.GoogleMap Found: Void
because getMapAsync() does not return anything. If you look at the documentation for this function:
public void getMapAsync (OnMapReadyCallback callback)
Sets a callback object which will be triggered when the GoogleMap instance is ready to be used.
Note:
This method must be called from the main thread. The callback will be executed in the main thread. In the case where Google Play services is not installed on the user's device, the callback will not be triggered until the user installs it. In the rare case where the GoogleMap is destroyed immediately after creation, the callback is not triggered. The GoogleMap object provided by the callback is non-null.
OnMapReadyCallback is an interface that needs implemented and passed to through this function. Nothing is currently assigned to your googleMap variable you should instead set its value in this block of code which implements OnMapReadyCallback
#Override
public void onMapReady(GoogleMap googleMap) {
this.googleMap = googleMap;
}

how to get url with different ids in android (async task)

EDIT: Found the solution to my problem.
The json string output returned the wrong url for my local images.
i am barely new to android and struggle with asyncTask.
What i want is to get the corresponding image to a marker on a map.
every entry on this map has its own image which has to be loaded from server via json.
the image load works fine but i dont get the right workflow to get the image i need for one entry.
by now i have one solution to load an async task in a for-loop, but this cant be the right way because the app refuses to go on after 43 tasks and stops with
"ECONNECTION TIMEOUT"
so how can get the asynctask out of the loop?
hope anyone can help? thank you!
here is my code:
public class MapsActivity extends AppCompatActivity implements OnMapReadyCallback {
private GoogleMap mMap;
JSONArray contentJson;
String contentId;
String imageJsonUrl;
String userId;
Bitmap bmp;
LatLng latLng;
Marker m;
HashMap<Marker, String> hashMap;
int k = 0;
// check value for Request check
final int MY_LOCATION_REQUEST_CODE = 3;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(myToolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
if(this.getIntent().getExtras() != null) {
try {
contentJson = new JSONArray(this.getIntent().getStringExtra("contentJson"));
// Log.v("TESTITEST", contentJson.toString());
} catch (JSONException e) {
Log.e("EXCEPTION", "unexpected JSON exception", e);
e.printStackTrace();
}
}
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_maps, menu);
return true;
}
public LatLng getLatLngPosition() {
return new LatLng(0, 0);
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
//Ask for Permission. If granted show my Location
if (ActivityCompat.checkSelfPermission(MapsActivity.this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Check Permissions Now
ActivityCompat.requestPermissions(MapsActivity.this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_LOCATION_REQUEST_CODE);
} else {
// permission has been granted, continue as usual
mMap.setMyLocationEnabled(true);
}
PlaceAutocompleteFragment autocompleteFragment = (PlaceAutocompleteFragment)
getFragmentManager().findFragmentById(R.id.place_autocomplete_fragment);
autocompleteFragment.setOnPlaceSelectedListener(new PlaceSelectionListener() {
#Override
public void onPlaceSelected(Place place) {
// TODO: Get info about the selected place.
LatLng selectedLocation = place.getLatLng();
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(selectedLocation, 10f));
}
#Override
public void onError(Status status) {
// TODO: Handle the error.
Log.i("PlaceSelectorError", "An error occurred: " + status);
}
});
LatLng bonn = new LatLng(50.7323, 7.1847);
LatLng cologne = new LatLng(50.9333333, 6.95);
//mMap.addMarker(new MarkerOptions().position(bonn).title("Marker in Bonn"));
// hash map for saving content id with marker
hashMap = new HashMap<Marker, String>();
if(contentJson != null) {
if (this.getIntent().getStringExtra("contentId") == null) {
// show all contents of my friends
try {
for (int i = 0; i < contentJson.length(); i++) {
JSONObject jsonInfo = contentJson.getJSONObject(i);
JSONArray contents = jsonInfo.getJSONArray("content");
// Log.v("contentslength", String.valueOf(contents.length()));
//get all contents of one user
for (int j = 0; j < contents.length(); j++) {
JSONObject eachcontent = contents.getJSONObject(j);
//Log.v("eachcontent", eachcontent.toString());
JSONObject location = eachcontent.getJSONObject("Location");
String contentId = eachcontent.getString("id");
String contentTitle = eachcontent.getString("title");
userId = eachcontent.getString("user_id");
latLng = new LatLng(Double.valueOf(location.getString("latitude")), Double.valueOf(location.getString("longitude")));
new MapImageLoadTask("http://192.168.63.35:1234/rest_app_users/getImage/", userId, contentId, contentTitle, latLng).execute();
Log.v("contentTitle", contentTitle);
//Log.v("m", m.toString());
//m = mMap.addMarker(new MarkerOptions().title(contentTitle).position(new LatLng(Double.valueOf(location.getString("latitude")), Double.valueOf(location.getString("longitude")))).icon(BitmapDescriptorFactory.fromBitmap(bmp)));
}
}
} catch (JSONException e) {
Log.e("Exception", "unexpected JSON exception", e);
e.printStackTrace();
}
}
else {
// if we only want to see a specific content
try {
for (int i = 0; i < contentJson.length(); i++) {
JSONObject jsonInfo = contentJson.getJSONObject(i);
JSONArray contents = jsonInfo.getJSONArray("content");
//get all contents of one user
for (int j = 0; j < contents.length(); j++) {
JSONObject eachcontent = contents.getJSONObject(j);
JSONObject location = eachcontent.getJSONObject("Location");
if(eachcontent.getString("id").equals(this.getIntent().getStringExtra("contentId"))) {
String contentId = eachcontent.getString("id");
String contentTitle = eachcontent.getString("title");
userId = eachcontent.getString("user_id");
latLng = new LatLng(Double.valueOf(location.getString("latitude")), Double.valueOf(location.getString("longitude")));
// Log.v("LATLNG", contentId);
new MapImageLoadTask("http://192.168.63.35:1234/rest_app_users/getImage/", userId, contentId, contentTitle, latLng).execute();
continue;
}
}
}
} catch (JSONException e) {
Log.e("LOGEDILOG", "unexpected JSON exception", e);
e.printStackTrace();
}
}
}
mMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() {
#Override
public void onMyLocationChange(Location location) {
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(location.getLatitude(), location.getLongitude()), 10f));
mMap.setOnMyLocationChangeListener(null);
}
});
mMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener() {
#Override
public void onInfoWindowClick(Marker marker) {
String id = hashMap.get(marker);
Log.v("BITMAP", bmp.toString());
try {
Context context = getApplicationContext();
Intent mapIntent = new Intent(getApplicationContext(), contentDetailActivity.class);
mapIntent.putExtra("contentId", id);
mapIntent.putExtra("contentJson", contentJson.toString());
mapIntent.putExtra("userId", userId);
String filename = "profileImage.png";
FileOutputStream stream = context.openFileOutput(filename, Context.MODE_PRIVATE);
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
//Cleanup
stream.close();
mapIntent.putExtra("image", filename);
startActivity(mapIntent);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public Marker[] addMarkers() {
return null;
}
/**
* lets you load Image from external source via url
*/
public class MapImageLoadTask extends AsyncTask<Void, Void, Bitmap> {
private final String LOG_TAG = MapImageLoadTask.class.getSimpleName();
String url, userId, contentId, title;
LatLng location;
BufferedReader reader = null;
public MapImageLoadTask(String url, String userId, String contentId, String title, LatLng location) {
this.url = url;
this.userId = userId;
this.contentId = contentId;
this.title = title;
this.location = location;
}
private String getImageUrlFromJson(String imageJson) throws JSONException {
JSONObject imageJsonOutput = new JSONObject(imageJson);
imageJsonUrl = imageJsonOutput.getString("imageUrl");
//Log.v(LOG_TAG, imageJsonUrl);
return imageJsonUrl;
}
#Override
protected Bitmap doInBackground(Void... params) {
String imageJson = null;
try {
URL urlConnection = new URL(url + userId);
HttpURLConnection connection = (HttpURLConnection) urlConnection
.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
StringBuffer buffer = new StringBuffer();
if (input == null) {
// Nothing to do.
//forecastJsonStr = null;
return null;
}
reader = new BufferedReader(new InputStreamReader(input));
String line;
while ((line = reader.readLine()) != null) {
// Since it's JSON, adding a newline isn't necessary (it won't affect parsing)
// But it does make debugging a *lot* easier if you print out the completed
// buffer for debugging.
buffer.append(line + "\n");
}
if (buffer.length() == 0) {
return null;
}
imageJson = buffer.toString();
} catch (Exception e) {
e.printStackTrace();
}
try {
String jsonUrl = getImageUrlFromJson(imageJson);
URL url = new URL(jsonUrl);
bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
return bmp;
}
catch(Exception e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
k +=1;
Log.v("COUNTER", String.valueOf(k));
m = mMap.addMarker(new MarkerOptions().title(title).position(location).icon(BitmapDescriptorFactory.fromBitmap(bmp)));
hashMap.put(m, contentId);
}
}
}

Your problem maybe AsyncTask limitations. In android.os.AsyncTask.java you will see core size and blockingqueue size(128), should use counter for asynctask and debug it(Problem is, lots of async tasks or other).
AsyncTask.java
public abstract class AsyncTask<Params, Progress, Result> {
private static final String LOG_TAG = "AsyncTask";
private static final int CPU_COUNT = Runtime.getRuntime().availableProcessors();
private static final int CORE_POOL_SIZE = CPU_COUNT + 1;
private static final int MAXIMUM_POOL_SIZE = CPU_COUNT * 2 + 1;
private static final int KEEP_ALIVE = 1;
private static final ThreadFactory sThreadFactory = new ThreadFactory() {
private final AtomicInteger mCount = new AtomicInteger(1);
public Thread newThread(Runnable r) {
return new Thread(r, "AsyncTask #" + mCount.getAndIncrement());
}
};
private static final BlockingQueue<Runnable> sPoolWorkQueue =
new LinkedBlockingQueue<Runnable>(128);
...}
Change Your Code Use Buffer(RequestData) And Use Only One Async Task. Update Market instance every publishProgress in onProgressUpdate
private GoogleMap mMap;
JSONArray contentJson;
String contentId;
String imageJsonUrl;
String userId;
Bitmap bmp;
LatLng latLng;
Marker m;
HashMap<Marker, String> hashMap;
int k = 0;
// check value for Request check
final int MY_LOCATION_REQUEST_CODE = 3;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(myToolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
if(this.getIntent().getExtras() != null) {
try {
contentJson = new JSONArray(this.getIntent().getStringExtra("contentJson"));
// Log.v("TESTITEST", contentJson.toString());
} catch (JSONException e) {
Log.e("EXCEPTION", "unexpected JSON exception", e);
e.printStackTrace();
}
}
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_maps, menu);
return true;
}
public LatLng getLatLngPosition() {
return new LatLng(0, 0);
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
//Ask for Permission. If granted show my Location
if (ActivityCompat.checkSelfPermission(MapsActivity.this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Check Permissions Now
ActivityCompat.requestPermissions(MapsActivity.this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_LOCATION_REQUEST_CODE);
} else {
// permission has been granted, continue as usual
mMap.setMyLocationEnabled(true);
}
PlaceAutocompleteFragment autocompleteFragment = (PlaceAutocompleteFragment)
getFragmentManager().findFragmentById(R.id.place_autocomplete_fragment);
autocompleteFragment.setOnPlaceSelectedListener(new PlaceSelectionListener() {
#Override
public void onPlaceSelected(Place place) {
// TODO: Get info about the selected place.
LatLng selectedLocation = place.getLatLng();
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(selectedLocation, 10f));
}
#Override
public void onError(Status status) {
// TODO: Handle the error.
Log.i("PlaceSelectorError", "An error occurred: " + status);
}
});
LatLng bonn = new LatLng(50.7323, 7.1847);
LatLng cologne = new LatLng(50.9333333, 6.95);
//mMap.addMarker(new MarkerOptions().position(bonn).title("Marker in Bonn"));
// hash map for saving content id with marker
hashMap = new HashMap<Marker, String>();
if(contentJson != null) {
if (this.getIntent().getStringExtra("contentId") == null) {
// show all contents of my friends
try {
for (int i = 0; i < contentJson.length(); i++) {
JSONObject jsonInfo = contentJson.getJSONObject(i);
JSONArray contents = jsonInfo.getJSONArray("content");
// Log.v("contentslength", String.valueOf(contents.length()));
//get all contents of one user
for (int j = 0; j < contents.length(); j++) {
JSONObject eachcontent = contents.getJSONObject(j);
//Log.v("eachcontent", eachcontent.toString());
JSONObject location = eachcontent.getJSONObject("Location");
String contentId = eachcontent.getString("id");
String contentTitle = eachcontent.getString("title");
userId = eachcontent.getString("user_id");
latLng = new LatLng(Double.valueOf(location.getString("latitude")), Double.valueOf(location.getString("longitude")));
new MapImageLoadTask("http://192.168.63.35:1234/rest_app_users/getImage/", userId, contentId, contentTitle, latLng).execute();
Log.v("contentTitle", contentTitle);
//Log.v("m", m.toString());
//m = mMap.addMarker(new MarkerOptions().title(contentTitle).position(new LatLng(Double.valueOf(location.getString("latitude")), Double.valueOf(location.getString("longitude")))).icon(BitmapDescriptorFactory.fromBitmap(bmp)));
}
}
} catch (JSONException e) {
Log.e("Exception", "unexpected JSON exception", e);
e.printStackTrace();
}
}
else {
// if we only want to see a specific content
try {
List<RequestData> datas = new ArrayList<RequestData>();
for (int i = 0; i < contentJson.length(); i++) {
JSONObject jsonInfo = contentJson.getJSONObject(i);
JSONArray contents = jsonInfo.getJSONArray("content");
//get all contents of one user
for (int j = 0; j < contents.length(); j++) {
JSONObject eachcontent = contents.getJSONObject(j);
JSONObject location = eachcontent.getJSONObject("Location");
if(eachcontent.getString("id").equals(this.getIntent().getStringExtra("contentId"))) {
String contentId = eachcontent.getString("id");
String contentTitle = eachcontent.getString("title");
userId = eachcontent.getString("user_id");
latLng = new LatLng(Double.valueOf(location.getString("latitude")), Double.valueOf(location.getString("longitude")));
// Log.v("LATLNG", contentId);
RequestData data = new RequestData();
data.url = "http://192.168.63.35:1234/rest_app_users/getImage/";
data.userId = userId;
data.contentId = contentId;
data.contentTitle = contentTitle;
data.latlng = latlng;
datas.add(data);
//new MapImageLoadTask("http://192.168.63.35:1234/rest_app_users/getImage/", userId, contentId, contentTitle, latLng).execute();
continue;
}
}
}
new MapImageLoadTask(datas).execute();
} catch (JSONException e) {
Log.e("LOGEDILOG", "unexpected JSON exception", e);
e.printStackTrace();
}
}
}
mMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() {
#Override
public void onMyLocationChange(Location location) {
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(location.getLatitude(), location.getLongitude()), 10f));
mMap.setOnMyLocationChangeListener(null);
}
});
mMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener() {
#Override
public void onInfoWindowClick(Marker marker) {
String id = hashMap.get(marker);
Log.v("BITMAP", bmp.toString());
try {
Context context = getApplicationContext();
Intent mapIntent = new Intent(getApplicationContext(), contentDetailActivity.class);
mapIntent.putExtra("contentId", id);
mapIntent.putExtra("contentJson", contentJson.toString());
mapIntent.putExtra("userId", userId);
String filename = "profileImage.png";
FileOutputStream stream = context.openFileOutput(filename, Context.MODE_PRIVATE);
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
//Cleanup
stream.close();
mapIntent.putExtra("image", filename);
startActivity(mapIntent);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public Marker[] addMarkers() {
return null;
}
/**
* lets you load Image from external source via url
*/
static class RequestData{
public String url;
public String userId;
public String contentId;
public String contentTitle;
public LatLng latLng;
public Bitmap bmp;
}
public class MapImageLoadTask extends AsyncTask<Void, RequestData, Void> {
private final String LOG_TAG = MapImageLoadTask.class.getSimpleName();
BufferedReader reader = null;
List<RequestData> dataSet;
public MapImageLoadTask(List<RequestData> dataSet) {
this.dataSet = dataSet;
}
private String getImageUrlFromJson(String imageJson) throws JSONException {
JSONObject imageJsonOutput = new JSONObject(imageJson);
imageJsonUrl = imageJsonOutput.getString("imageUrl");
//Log.v(LOG_TAG, imageJsonUrl);
return imageJsonUrl;
}
#Override
protected Bitmap doInBackground(Void... params) {
for(RequestData item : dataSet){
String imageJson = null;
try {
URL urlConnection = new URL(url + userId);
HttpURLConnection connection = (HttpURLConnection) urlConnection
.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
StringBuffer buffer = new StringBuffer();
if (input == null) {
// Nothing to do.
//forecastJsonStr = null;
return null;
}
reader = new BufferedReader(new InputStreamReader(input));
String line;
while ((line = reader.readLine()) != null) {
// Since it's JSON, adding a newline isn't necessary (it won't affect parsing)
// But it does make debugging a *lot* easier if you print out the completed
// buffer for debugging.
buffer.append(line + "\n");
}
if (buffer.length() == 0) {
return null;
}
imageJson = buffer.toString();
} catch (Exception e) {
e.printStackTrace();
}
try {
String jsonUrl = getImageUrlFromJson(imageJson);
URL url = new URL(jsonUrl);
bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
//
item.bmp = bmp;
publishProgress(item);
}
catch(Exception e) {
e.printStackTrace();
}
}
return null;
}
protected void onPublishProgress(RequestData item){
k +=1;
Log.v("COUNTER", String.valueOf(k));
m = mMap.addMarker(new MarkerOptions().title(item.title).position(item.location).icon(BitmapDescriptorFactory.fromBitmap(item.bmp)));
hashMap.put(m, contentId);
}
#Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
}
}
}

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