Develop Reference

Empty Activity When I try to load JSON from S3

When I navigate to the activity that should load a ListView from a JSON hosted on AWS S3, I get nothing but a blank activity. There's no error message, no errors in the debugger, and Logcat doesn't seem to hold any relevant information.
Here's LoadJSONTask.java:
package com.teamplum.projectapple;
import android.os.AsyncTask;
import com.google.gson.Gson;
import com.google.gson.JsonSyntaxException;
import com.teamplum.projectapple.NewsDO;
import com.teamplum.projectapple.Response;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
public class LoadJSONTask extends AsyncTask<String, Void, Response> {
public LoadJSONTask(Listener listener) {
mListener = listener;
}
public interface Listener {
void onLoaded(List<NewsDO> androidList);
void onError();
}
private Listener mListener;
#Override
protected Response doInBackground(String... strings) {
try {
String stringResponse = loadJSON(strings[0]);
Gson gson = new Gson();
return gson.fromJson(stringResponse, Response.class);
} catch (IOException e) {
e.printStackTrace();
return null;
} catch (JsonSyntaxException e) {
e.printStackTrace();
return null;
}
}
#Override
protected void onPostExecute(Response response) {
if (response != null) {
mListener.onLoaded(response.getAndroid());
} else {
mListener.onError();
}
}
private String loadJSON(String jsonURL) throws IOException {
URL url = new URL(jsonURL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000);
conn.setConnectTimeout(15000);
conn.setRequestMethod("GET");
conn.setDoInput(true);
conn.connect();
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
StringBuilder response = new StringBuilder();
while ((line = in.readLine()) != null) {
response.append(line);
}
in.close();
return response.toString();
}
}
and here's MainActivity.java:
package com.teamplum.projectapple;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
//import com.teamplum.projectapple.NewsDO;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class MainActivity extends AppCompatActivity implements LoadJSONTask.Listener, AdapterView.OnItemClickListener {
private ListView mListView;
public static final String URL = "https://s3-eu-west-1.amazonaws.com/tyi-work/Work_Experience.json";
private List<HashMap<String, String>> mAndroidMapList = new ArrayList<>();
private static final String KEY_TIT = "title";
private static final String KEY_CAT = "category";
private static final String KEY_DES = "description";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mListView = findViewById(R.id.list_view);
mListView.setOnItemClickListener(this);
new LoadJSONTask(this).execute(URL);
}
#Override
public void onLoaded(List<NewsDO> androidList) {
for (NewsDO work : androidList) {
HashMap<String, String> map = new HashMap<>();
map.put(KEY_TIT, work.getTitle());
map.put(KEY_CAT, work.getCategory());
map.put(KEY_DES, work.getDescription());
mAndroidMapList.add(map);
}
loadListView();
}
#Override
public void onError() {
Toast.makeText(this, "Error !", Toast.LENGTH_SHORT).show();
}
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Toast.makeText(this, mAndroidMapList.get(i).get(KEY_TIT),Toast.LENGTH_LONG).show();
}
private void loadListView() {
ListAdapter adapter = new SimpleAdapter(MainActivity.this, mAndroidMapList, R.layout.list_item,
new String[] { KEY_CAT, KEY_TIT, KEY_DES },
new int[] { R.id.version,R.id.name, R.id.api });
mListView.setAdapter(adapter);
}
}
I used this tutorial to help make this, if you need any extra information please feel free to ask, thank you.

I have tested the async task for the URL connection and its working fine.
The problem is either on the parsing or on the activity side. Have you tried putting breakpoints and follow the data?

How to fetch data from net faster and display in listView?

I have a news app. My app takes so much time to fetch data from server and display it on the listView.But i have seen that apps like flipboard,facebook and Game News which has more data to fetch than mine does it faster.I think my app loads the entire data and displays the entire list together.Is there a way to display the list such that it loads the items in listView one by one?I do the fetching using a AsyncTaskLoader in the background.Also how to display a large list of news like 100 in a list .
MainActivity:
package com.example.android.gametalks;
import android.app.LoaderManager;
import android.content.Intent;
import android.content.Loader;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<List<GameNews>> {
//IGN url
final String ign_url = "https://newsapi.org/v1/articles?source=ign&sortBy=top&apiKey=679f6fb918d34343b18590ca70f7fcde";
final String google_url = " https://newsapi.org/v1/articles?source=google-news&sortBy=top&apiKey=679f6fb918d34343b18590ca70f7fcde";
final String engadget_url = "https://newsapi.org/v1/articles?source=engadget&sortBy=top&apiKey=679f6fb918d34343b18590ca70f7fcde";
GameAdapter adapter ;
private View progressBar;
final private int game_loader = 0;
ArrayList<String> urls = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
urls.add(ign_url);
urls.add(google_url);
urls.add(engadget_url);
//Getting listView
ListView gameListView = (ListView) findViewById(R.id.listView);
//progress bar finding
progressBar = findViewById(R.id.progress_bar);
ArrayList<GameNews> gameList = new ArrayList<>();
//Making a new arrayAdapter
adapter = new GameAdapter(this,gameList);
//Connecting ArrayAdapter to ListView
gameListView.setAdapter(adapter);
getLoaderManager().initLoader(game_loader, null, this);
//ListView item click listner
gameListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
GameNews currentEarthquake = adapter.getItem(i);
String url = currentEarthquake.getUrl();
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse(url));
startActivity(intent);
}
});
}
#Override
public Loader<List<GameNews>> onCreateLoader(int i, Bundle bundle) {
return new GameLoader(this,urls);
}
#Override
public void onLoadFinished(Loader<List<GameNews>> loader, List<GameNews> games) {
progressBar.setVisibility(View.INVISIBLE);
adapter.clear();
if(games == null)
{
return;
}
adapter.addAll(games);
}
#Override
public void onLoaderReset(Loader<List<GameNews>> loader) {
adapter.clear();
}
}
GameLoader:
package com.example.android.gametalks;
import android.content.AsyncTaskLoader;
import android.content.Context;
import java.util.ArrayList;
import java.util.List;
/**
* Created by apple on 9/8/17.
*/
public class GameLoader extends AsyncTaskLoader<List<GameNews>> {
private ArrayList<String> Urls = new ArrayList<>();
public GameLoader(Context context, ArrayList<String> Url) {
super(context);
Urls = Url;
}
#Override
protected void onStartLoading()
{
forceLoad();
}
#Override
public List<GameNews> loadInBackground() {
if(Urls == null)
{
return null;
}
// Perform the HTTP request for earthquake data and process the response.
List<GameNews> games = QueryUtils.FetchEarthquakeData(Urls);
return games;
}
}
QueryUtils(Here the network fetching takes place):
package com.example.android.gametalks;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.widget.ListView;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.Charset;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
/**
* Helper methods related to requesting and receiving earthquake data from USGS.
*/
public final class QueryUtils {
private static final String LOG_TAG = QueryUtils.class.getSimpleName();
/**
* Create a private constructor because no one should ever create a {#link QueryUtils} object.
* This class is only meant to hold static variables and methods, which can be accessed
* directly from the class name QueryUtils (and an object instance of QueryUtils is not needed).
*/
private QueryUtils() {
}
public static List<GameNews> FetchEarthquakeData(ArrayList<String> Url) {
List<GameNews> games ;
List<GameNews> Total = new ArrayList<>();
URL url;
Log.d(LOG_TAG,Url.get(0));
for(int i = 0 ; i < Url.size(); i++) {
url = createUrl(Url.get(i));
try {
//Make http request
String jsonResponse = makeHttpRequest(url);
games = extractFeatureFromJson(jsonResponse);
Total.addAll(games);
} catch (IOException e) {
Log.e("IOException", "" + e);
}
}
return Total;
}
private static URL createUrl(String stringUrl) {
URL url = null;
try {
url = new URL(stringUrl);
} catch (MalformedURLException e) {
Log.e(LOG_TAG, "Error with creating URL ", e);
}
return url;
}
private static String makeHttpRequest(URL url) throws IOException {
String jsonResponse = "";
InputStream inputStream = null;
HttpURLConnection urlConnection = null;
try {
urlConnection = (HttpURLConnection) url.openConnection();
if (urlConnection.getResponseCode() == 200) {
inputStream = urlConnection.getInputStream();
jsonResponse = readInputStream(inputStream);
} else {
Log.e(LOG_TAG, "" + urlConnection.getResponseCode());
return null;
}
} catch (IOException e) {
Log.d(LOG_TAG, "" + e);
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
if (inputStream != null) {
// function must handle java.io.IOException here
inputStream.close();
}
}
return jsonResponse;
}
private static String readInputStream(InputStream inputStream) throws IOException {
StringBuilder output = new StringBuilder();
if (inputStream != null) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, Charset.forName("UTF-8"));
BufferedReader reader = new BufferedReader(inputStreamReader);
String line = reader.readLine();
while (line != null) {
output.append(line);
line = reader.readLine();
}
}
return output.toString();
}
private static ArrayList<GameNews> extractFeatureFromJson(String jsonResponse) {
ArrayList<GameNews> games = new ArrayList<>();
try {
JSONObject jsonObject = new JSONObject(jsonResponse);
JSONArray articles = jsonObject.getJSONArray("articles");
for (int i = 0; i < articles.length(); i++) {
JSONObject currentGame = articles.getJSONObject(i);
// Extract the value for the key called "mag"
String title = currentGame.getString("title");
// Extract the value for the key called "place"
String description = currentGame.getString("description");
// Extract the value for the key called "url"
String url = currentGame.getString("url");
//Extract value from key called urlToImage
String urlToImage = "nn";
urlToImage = currentGame.getString("urlToImage");
URL urlOfImage = null;
Bitmap bmp = null;
try {
urlOfImage = new URL(urlToImage);
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
bmp = BitmapFactory.decodeStream(urlOfImage.openConnection().getInputStream());
} catch (IOException e) {
e.printStackTrace();
}
// Create a new {#link Earthquake} object with the magnitude, location, time,
// and url from the JSON response.
GameNews game = new GameNews(title, description,bmp,url);
// Add the new {#link Earthquake} to the list of earthquakes.
games.add(game);
}
} catch (JSONException e) {
Log.d(LOG_TAG, "" + e);
}
return games;
}
}
Thanks in advance.

Custom listView adapter, model, JSONParsing not working

I'm designing a listview that displays food information list from php server.
the url I passed is a php file after I convert it to json file. the list is not shown and whent I press refresh from menu I keep getting
(app stopped working) ..
here is FoodView.java Activity
import android.content.Context;
import android.os.AsyncTask;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.w3c.dom.Text;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import alsaad.layla.mysqldemo.Models.FoodModel;
import static android.R.attr.resource;
import static android.content.Context.LAYOUT_INFLATER_SERVICE;
public class FoodView extends AppCompatActivity {
private ListView lvFood;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_food_view);
lvFood = (ListView) findViewById(R.id.lvFood);
}
public class JSONTask extends AsyncTask<String, String, List<FoodModel>> {
#Override
protected List<FoodModel> doInBackground(String... params) {
HttpURLConnection httpURLConnection = null;
BufferedReader reader = null;
try {
URL url = new URL(params[0]);
httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.connect();
InputStream inputStream = httpURLConnection.getInputStream();
reader = new BufferedReader(new InputStreamReader(inputStream));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
String finalJson = buffer.toString();
JSONArray parentArray = new JSONArray(finalJson);
List<FoodModel> foodModelList = new ArrayList<>();
for (int i = 0; i < parentArray.length(); i++) {
JSONObject finalObject = parentArray.getJSONObject(i);
FoodModel foodModel = new FoodModel();
foodModel.setFood(finalObject.getString("name"));
//foodModel.setStatus(finalObject.getString("status"));
foodModel.setAmount(finalObject.getInt("amount"));
foodModel.setDescription(finalObject.getString("description"));
foodModel.setDate(finalObject.getInt("exDate"));
foodModelList.add(foodModel);
}
return foodModelList;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
} finally {
if (httpURLConnection != null) {
httpURLConnection.disconnect();
}
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(List<FoodModel> result) {
super.onPostExecute(result);
FoodAdapter adapter = new FoodAdapter(getApplicationContext(), R.layout.row, result);
lvFood.setAdapter(adapter);
}}
public class FoodAdapter extends ArrayAdapter {
private List<FoodModel> foodModelList;
private int resource;
private LayoutInflater inflater;
public FoodAdapter(Context context, int resource, List<FoodModel> objects) {
super(context, resource, objects);
foodModelList = objects;
this.resource = resource;
inflater = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = inflater.inflate(resource, null);
}
ImageView ivIcon;
TextView foodName, txt_amount, txt_desc, txt_date, txt_status;
ivIcon = (ImageView) convertView.findViewById(R.id.ivIcon);
foodName = (TextView) convertView.findViewById(R.id.foodName);
txt_amount = (TextView) convertView.findViewById(R.id.txt_amount);
txt_desc = (TextView) convertView.findViewById(R.id.txt_desc);
// txt_status = (TextView) convertView.findViewById(R.id.txt_status);
txt_date = (TextView) convertView.findViewById(R.id.txt_date);
foodName.setText(foodModelList.get(position).getFood());
txt_amount.setText("Amount: " + foodModelList.get(position).getAmount());
txt_desc.setText(foodModelList.get(position).getDescription());
// txt_status.setText(foodModelList.get(position).getStatus());
txt_date.setText("Date: " + foodModelList.get(position).getDate());
return convertView;
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.navigation_drawer, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_refresh) {
new JSONTask().execute("http://10.0.3.2/MySqlDemo/food.php");
return true;
}
return super.onOptionsItemSelected(item);
}
}
FoodModel.java
public class FoodModel {
private String food;
//private enum status;
private int amount;
private String image;
private String description;
private int date;
public int getDate() {
return date;
}
public void setDate(int date) {
this.date = date;
}
public String getFood() {
return food;
}
public void setFood(String food) {
this.food = food;
}
//public String getStatus() {
// return status;
// }
// public void setStatus(String status) {
// this.status = status;
//}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public int getAmount() {
return amount;
}
public void setAmount(int amount) {
this.amount = amount;
}
}
the logcat error:
02-20 05:06:08.084 4514-4514/alsaad.layla.mysqldemo E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.NullPointerException
at android.widget.ArrayAdapter.getCount(ArrayAdapter.java:330)
at android.widget.ListView.setAdapter(ListView.java:462)
at alsaad.layla.mysqldemo.FoodView$JSONTask.onPostExecute(FoodView.java:128)
at alsaad.layla.mysqldemo.FoodView$JSONTask.onPostExecute(FoodView.java:54)
at android.os.AsyncTask.finish(AsyncTask.java:631)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)

It seems like you are getting an exception in your for loop that's why it goes into an exception and returns null, so it shows a null pointer exception. Please replace getString() with optSting() and getInt() with optInt().
Solution:- Please put break point in your for loop and find it out otherwise use below option.
for (int i = 0; i < parentArray.length(); i++) {
JSONObject finalObject = parentArray.getJSONObject(i);
FoodModel foodModel = new FoodModel();
foodModel.setFood(finalObject.optString("name"));
//foodModel.setStatus(finalObject.optString("status"));
foodModel.setAmount(finalObject.optInt("amount"));
foodModel.setDescription(finalObject.optString("description"));
foodModel.setDate(finalObject.optInt("exDate"));
foodModelList.add(foodModel);
}
return null; replace with return new ArrayList<>(); to get from crash.

The method getCount() within the ArrayAdater returns the lenght of the object list atached to the adapter:
/**
* {#inheritDoc}
*/
public int getCount() {
return mObjects.size();
}
As you are using a custom ArrayAdapter i think you must Override this function to make it returns the size of your own objects list:
public int getCount() {
return foodModelList.size();
}

Why are you using ArrayAdapter instead i would suggest you to use BaseAdapter
It is the issue when you object is not able to get instance of ArrayAdpter and hence returning null pointer exception at getCount()

Error org.json.JSONException: Value <html><head><title> Error of type java.lang.String cannot be converted to JSONObject

I have a Android app about Public Transportation, and I have a PHP script that connects to mySQL database. This is the main.java
package com.chera.trans;
import com.chera.trans.R;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
public class Main extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()) {
case R.id.traseu2:
Intent traseu2 = new Intent(this, Traseu2.class);
this.startActivity(traseu2);
break;
case R.id.traseu401:
Intent traseu401 = new Intent(this, Traseu401.class);
this.startActivity(traseu401);
break;
default:
return super.onOptionsItemSelected(item);
}
return true;
}
}
And this is the code for Traseu2.java
package com.chera.trans;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.chera.trans.R;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
public class Traseu2 extends Activity {
private String jsonResult;
private String url = "http://transploiesti.tk/2.php";
private ListView listView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.traseu2);
listView = (ListView) findViewById(R.id.listView1);
accessWebService();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()) {
case R.id.traseu2:
Intent traseu2 = new Intent(this, Traseu2.class);
this.startActivity(traseu2);
break;
case R.id.traseu401:
Intent traseu401 = new Intent(this, Traseu401.class);
this.startActivity(traseu401);
break;
default:
return super.onOptionsItemSelected(item);
}
return true;
}
// Async Task to access the web
private class JsonReadTask extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... params) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(params[0]);
try {
HttpResponse response = httpclient.execute(httppost);
jsonResult = inputStreamToString(
response.getEntity().getContent()).toString();
}
catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
private StringBuilder inputStreamToString(InputStream is) {
String rLine = "";
StringBuilder answer = new StringBuilder();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
try {
while ((rLine = rd.readLine()) != null) {
answer.append(rLine);
}
}
catch (IOException e) {
// e.printStackTrace();
Toast.makeText(getApplicationContext(),
"Error..." + e.toString(), Toast.LENGTH_LONG).show();
}
return answer;
}
#Override
protected void onPostExecute(String result) {
ListDrwaer();
}
}// end async task
public void accessWebService() {
JsonReadTask task = new JsonReadTask();
// passes values for the urls string array
task.execute(new String[] { url });
}
// build hash set for list view
public void ListDrwaer() {
List<Map<String, String>> employeeList = new ArrayList<Map<String, String>>();
try {
JSONObject jsonResponse = new JSONObject(jsonResult);
JSONArray jsonMainNode = jsonResponse.optJSONArray("traseudoi");
for (int i = 0; i < jsonMainNode.length(); i++) {
JSONObject jsonChildNode = jsonMainNode.getJSONObject(i);
String name = jsonChildNode.optString("Statie");
String number = jsonChildNode.optString("Oraplecare");
String outPut = "Autobuzul pleaca din " + name + " la ora " + number;
employeeList.add(createEmployee("employees", outPut));
}
} catch (JSONException e) {
Toast.makeText(getApplicationContext(), "Error" + e.toString(),
Toast.LENGTH_SHORT).show();
}
SimpleAdapter simpleAdapter = new SimpleAdapter(this, employeeList,
android.R.layout.simple_list_item_1,
new String[] { "employees" }, new int[] { android.R.id.text1 });
listView.setAdapter(simpleAdapter);
}
private HashMap<String, String> createEmployee(String name, String number) {
HashMap<String, String> employeeNameNo = new HashMap<String, String>();
employeeNameNo.put(name, number);
return employeeNameNo;
}
}
` Why I receive this error when I m running the app? Thanks!

HTML is not JSON, and it can not be parsed into JSONObjects. The top answer for org.json.JSONException: Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject is pretty good at explaining this further.

HttpConnection can't connect in android

I need a help with some networking.
What i am trying to do is to send request to servlet from android and then servlet sends the response back to me.
Here is my code
GSP Client Activity
package com.gps.gpsclient;
import microsoft.mappoint.TileSystem;
import org.osmdroid.api.IProjection;
import org.osmdroid.tileprovider.tilesource.TileSourceFactory;
import org.osmdroid.util.GeoPoint;
import org.osmdroid.views.MapController;
import org.osmdroid.views.MapView;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class GPSClientActivity extends Activity {
private MapView view;
private MapDrawer mainDrawer;
private Intent intent;
private MapController mapController;
private static final String RequestorUrl="http://192.168.1.104:8080/Requestor/RQSRV";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gps);
view = (MapView) findViewById(R.id.mapView);
view.setTileSource(TileSourceFactory.MAPNIK);
view.setBuiltInZoomControls(true);
mapController = view.getController();
mapController.setZoom(10);
GeoPoint point2 = new GeoPoint(51496994, -134733);
mapController.setCenter(point2);
mainDrawer=new MapDrawer(view);
final Button button = (Button) findViewById(R.id.addButton);
button.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View arg0, MotionEvent arg1) {
intent=new Intent(GPSClientActivity.this,WaypointSetupActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivityForResult(intent,1);
return false;
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if(resultCode==RESULT_OK)
{
final MapPoint point=(MapPoint) data.getSerializableExtra("result");
GeoPoint point2 = new GeoPoint(51496994, -134254);
point.setGeo(point2);
view.setOnTouchListener(new View.OnTouchListener()
{
boolean added=false;
#Override
public boolean onTouch(View v, MotionEvent e)
{
if(!added)
{
IProjection project = view.getProjection();
final GeoPoint geo = (GeoPoint)project.fromPixels((int)e.getX(),(int)e.getY());
mainDrawer.addGeopointToMap(point.getName(), point.getDesc(), geo);
added=true;
Toast.makeText(view.getContext(), "Waypoint "+point.getName()+" was added to Map ", Toast.LENGTH_LONG).show();
DBAccessManager manager=new DBAccessManager();
manager.AddWaypointToDb(point.getName(), point.getDesc(), 1, 1, geo.getLatitudeE6(), geo.getLongitudeE6());
}
return false;
}});
}
}
}
DBAccessManager class
package com.gps.gpsclient;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.concurrent.ExecutionException;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import android.os.AsyncTask;
public class DBAccessManager extends AsyncTask <DBManagerParams, Void,String>
{
//public static final String Url="http://192.168.1.104:8080/Requestor/RQSRV";
public static final String Url="http://158.193.82.6:8080/Requestor/RQSRV";
public DBAccessManager()
{
}
public void AddWaypointToDb(String name,String desc,int Type,int Priority,long Latitude,long Longtitude)
{
String[] headers=new String[10];
String[] headers_values=new String[10];
headers[0]="type of command";
headers_values[0]="insert waypoint";
headers[1]="name";
headers_values[1]=name;
headers[2]="decription";
headers_values[2]=desc;
headers[3]="type";
headers_values[3]=Integer.toString(Type);
headers[4]="priority";
headers_values[4]=Integer.toString(Priority);
headers[5]="latitude";
headers_values[5]=Long.toString(Latitude);
headers[6]="longtitude";
headers_values[6]=Long.toString(Longtitude);
String response = null;
DBManagerParams params=new DBManagerParams(Url,headers,headers_values);
try
{
response=execute(params).get();
}
catch (InterruptedException e)
{
e.printStackTrace();
}
catch (ExecutionException e) {
e.printStackTrace();
}
System.out.println(response);
}
private String readOutput(InputStream in)
{
StringBuffer outputBuffer = new StringBuffer("");
try
{
BufferedReader buffer = new BufferedReader(new InputStreamReader(in));
String s = "";
while ((s = buffer.readLine()) != null)
outputBuffer.append(s);
}
catch (IOException e)
{
e.printStackTrace();
}
return outputBuffer.toString();
}
private InputStream getHttpOutConnection(String urlString,String[] headers,String[]header_values) {
InputStream stream=null;
URL url = null;
try {
url = new URL(urlString);
System.out.println(""+urlString);
URLConnection connection= url.openConnection();
HttpURLConnection httpConnection = (HttpURLConnection) connection;
httpConnection.setDoOutput(true);
httpConnection.setDoInput(true);
httpConnection.setRequestMethod("POST");
if (headers.length !=header_values.length)
{
System.err.println("Bad use of headers in :"+this.getClass().toString()+" Method: "+ this.getClass().getEnclosingMethod().getName());
}
else
{
for(int i =0;i<headers.length;i++)
{
if (headers[i]!=null)
httpConnection.setRequestProperty(headers[i], header_values[i]);
}
httpConnection.setReadTimeout(10000 /* milliseconds */);
httpConnection.setConnectTimeout(15000 /* milliseconds */);
httpConnection.setDoInput(true);
httpConnection.connect();
if (httpConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
System.out.println("HTTP OK");
stream=httpConnection.getInputStream();
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return stream;
}
#Override
protected String doInBackground(DBManagerParams... params) {
String response;
response=readOutput(getHttpOutConnection(params[0].URL,params[0].headers,params[0].headers_values));
return response;
}
}
class DBManagerParams
{
String URL;
String[]headers;
String[]headers_values;
String response;
DBManagerParams(String URL,String[]headers,String[]headers_values)
{
this.URL=URL;
this.headers=headers;
this.headers_values=headers_values;
}
}
Servlet side
package Applications;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.OutputStreamWriter;
import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
#WebServlet(name = "/RQSRV", urlPatterns = {"/RQSRV"})
public class RQSRV extends HttpServlet {
private static final long serialVersionUID = 1L;
private DBConnectionManager DBmanager;
public RQSRV() {
super();
DBmanager=new DBConnectionManager();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
System.out.println("Get was called");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
if (response.getHeader("type of command").equals("insert waypoint"))
{
String name,desc;
int type,prio;
long latitude,longtitude;
name=response.getHeader("name");
desc=response.getHeader("description");
type=Integer.parseInt(response.getHeader("type"));
prio=Integer.parseInt(response.getHeader("priority"));
latitude=Long.parseLong(response.getHeader("latitude"));
longtitude=Long.parseLong(response.getHeader("longtitude"));
DBmanager.Connect();
String command="insert into waypoints values("+(DBmanager.getMaxWaypointId()+1)+",0,"+name+","+desc+","+prio+","+latitude+","+longtitude+")";
DBmanager.ExecuteQueryWithoutResults(command);
}
}
}
App stops working while i call httpConnection.connect().
It is just trying to connect and then after a while it stops on connection timeout.
Things i check:
Servlet is running, and it's accesible from Web Browser
All firewals are stopped
Url of servlet is right
I hope you know what it should be

in your server servlet side you are using "response" to get the data sending by Android?
To get the data is "request"
if (request.getHeader("type of command")!=null && request.getHeader("type of command").equals("insert waypoint"))
{
String name,desc;
int type,prio;
long latitude,longtitude;
name=request.getHeader("name");
desc=request.getHeader("description");
type=Integer.parseInt(request.getHeader("type"));
prio=Integer.parseInt(request.getHeader("priority"));
latitude=Long.parseLong(request.getHeader("latitude"));
longtitude=Long.parseLong(request.getHeader("longtitude"));
DBmanager.Connect();
String command="insert into waypoints values("+(DBmanager.getMaxWaypointId()+1)+",0,"+name+","+desc+","+prio+","+latitude+","+longtitude+")";
DBmanager.ExecuteQueryWithoutResults(command);
//important send status ok to ANDROID to prevent timeout.
response.setStatus(HttpServletResponse.SC_OK);
}else{
//important send status ok to ANDROID to prevent timeout.
response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
}