i used the code on my phone bellow to get address { country, street, city}, but it didnt work for many inputs, why? and sometimes crashing. please how to get the full address by passing Longitude and Latitude to a method that returns all the available address to this Longitude and Latitude. can you please provide me with the answer to get best result. help me.
import java.io.IOException;
import java.util.List;
import java.util.Locale;
import android.app.Activity;
import android.content.Context;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class Get_Location_Name extends Activity implements OnClickListener {
private EditText ET1;
private EditText ET2;
private TextView TV1;
private Button B1;
static String result ="";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.location_name);
ET1=(EditText)this.findViewById(R.id.ET1_location_name);
ET2=(EditText)this.findViewById(R.id.ET2_location_name);
TV1=(TextView)this.findViewById(R.id.TV1_Location_name);
B1=(Button)this.findViewById(R.id.B1_Location_name);
B1.setOnClickListener(this);
}
#Override
public void onClick(View arg0) {
String s=null;
if(!ET1.getText().toString().isEmpty() && !ET2.getText().toString().isEmpty())
{
if(this.isOnline())
{
for(int i=0;i<=10;i++)
{
s=getAddressFromLocation(Double.parseDouble(ET2.getText().toString()),
Double.parseDouble(ET1.getText().toString()),this);
}
if(s!=null)
{
Log.d("ssss","s"+s);
TV1.setText(s);
}
else
TV1.setText("s is null");
}
else
TV1.setText("no internet connection");
}
else
TV1.setText("Enter the Lat. and Lon.");
}
public boolean isOnline() {
// code to check connectivity // it works fine(no problems)
}
here is the method that i want to modify
public static String getAddressFromLocation(final double lon,final double lat, final Context context)
{
Thread thread = new Thread() {
#Override public void run()
{
Geocoder geocoder = new Geocoder(context, Locale.getDefault());
try {
List<Address> list = geocoder.getFromLocation(
lat, lon, 1);
if (list != null && list.size() > 0)
{
Address address = list.get(0);
result = " "+address.getAddressLine(0) + ", " + address.getLocality()+","+address.getCountryName();
}
}
catch (IOException e)
{
Log.e("fafvsafagag", "Impossible to connect to Geocoder", e);
}
}
};
thread.start();
return result;
}
}
please answer my question.
There is a known issue that Geocoder doesn't always returns a value. See Geocoder doesn't always return a value and geocoder.getFromLocationName returns only null. You can try to send a request 3 times in a for loop. It should be able to return atleast once. If not then, their might be a connection issue or can be other issues like server did not reply to your request. For me sometimes it never returned anything even if it was connected to internet. Then, I used this much more reliable way to get the address everytime:
//lat, lng are Double variables containing latitude and longitude values.
public JSONObject getLocationInfo() {
//Http Request
HttpGet httpGet = new HttpGet("http://maps.google.com/maps/api/geocode/json?latlng="+lat+","+lng+"&sensor=true");
HttpClient client = new DefaultHttpClient();
HttpResponse response;
StringBuilder stringBuilder = new StringBuilder();
try {
response = client.execute(httpGet);
HttpEntity entity = response.getEntity();
InputStream stream = entity.getContent();
int b;
while ((b = stream.read()) != -1) {
stringBuilder.append((char) b);
}
} catch (ClientProtocolException e) {
} catch (IOException e) {
}
//Create a JSON from the String that was return.
JSONObject jsonObject = new JSONObject();
try {
jsonObject = new JSONObject(stringBuilder.toString());
} catch (JSONException e) {
e.printStackTrace();
}
return jsonObject;
}
I called the function as follows to get the complete address:
JSONObject ret = getLocationInfo(); //Get the JSON that is returned from the API call
JSONObject location;
String location_string;
//Parse to get the value corresponding to `formatted_address` key.
try {
location = ret.getJSONArray("results").getJSONObject(0);
location_string = location.getString("formatted_address");
Log.d("test", "formattted address:" + location_string);
} catch (JSONException e1) {
e1.printStackTrace();
}
You can call this inside AsyncTask or a new thread. I used Asynctask for the same.
Hope this helps.This worked for me. If you replace the URL with the lat and longitude coordinates and see the returned JSON object in a web browser. You'll see what just happened.
Related
I'm New to android development and I don't understand clearly how to create a appwidget for application that parse JSON Data and display in list.
I solved my problem using this link (https://laaptu.wordpress.com/2013/07/19/android-app-widget-with-listview/).
It has Series of Tutorials
(1.app widget with listview
2.populate app widget listview with data from web
3.download images and show on imageview of appwidget with listview
4.setting update interval on appwidget with listview
5.how to make appwidget update work after phone reboot)
To Use Simple JSON URL to fetch images and texts, i made the following changes in RemoteFetchService.java from third tutorial,
import java.util.ArrayList;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Service;
import android.appwidget.AppWidgetManager;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.os.IBinder;
import android.util.Log;
import com.androidquery.AQuery;
import com.androidquery.callback.AjaxCallback;
import com.androidquery.callback.AjaxStatus;
import com.example.mk.widgets.data.DatabaseManager;
import com.example.mk.widgets.data.FileManager;
public class RemoteFetchService extends Service {
private int appWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
JSONObject jsonobject;
JSONArray jsonarray;
AQuery aquery;
private String remoteJsonUrl = "http://microblogging.wingnity.com/JSONParsingTutorial/jsonActors";
public static ArrayList<ListItem> listItemList;
private int count = 0;
#Override
public IBinder onBind(Intent arg0) {
return null;
}
/*
* Retrieve appwidget id from intent it is needed to update widget later
* initialize our AQuery class
*/
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (intent.hasExtra(AppWidgetManager.EXTRA_APPWIDGET_ID))
appWidgetId = intent.getIntExtra(
AppWidgetManager.EXTRA_APPWIDGET_ID,
AppWidgetManager.INVALID_APPWIDGET_ID);
aquery = new AQuery(getBaseContext());
new DownloadJSON().execute();
return super.onStartCommand(intent, flags, startId);
}
// DownloadJSON AsyncTask
private class DownloadJSON extends AsyncTask<Void, Void, Void> {
#Override
protected Void doInBackground(Void... params) {
// Create an array
listItemList = new ArrayList<ListItem>();
// Retrieve JSON Objects from the given URL address
jsonobject = JSONfunctions.getJSONfromURL(remoteJsonUrl);
try {
// Locate the array name in JSON
jsonarray = jsonobject.getJSONArray("actors");
for (int i = 0; i < jsonarray.length(); i++) {
jsonobject = jsonarray.getJSONObject(i);
// Retrive JSON Objects
ListItem listItem = new ListItem();
listItem.heading = jsonobject.getString("name");
listItem.content = jsonobject.getString("country");
listItem.imageUrl = jsonobject.getString("image");
listItemList.add(listItem);
}
storeListItem();
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
}
/**
* Instead of using static ArrayList as we have used before,no we rely upon
* data stored on database so saving the fetched json file content into
* database and at same time downloading the image from web as well
*/
private void storeListItem() {
DatabaseManager dbManager = DatabaseManager.INSTANCE;
dbManager.init(getBaseContext());
dbManager.storeListItems(appWidgetId, listItemList);
int length = listItemList.size();
for (int i = 0; i < length; i++) {
ListItem listItem = listItemList.get(i);
final int index = i;
aquery.ajax(listItem.imageUrl, Bitmap.class,new AjaxCallback<Bitmap>() {
#Override
public void callback(String url, Bitmap bitmap, AjaxStatus status) {
super.callback(url, bitmap, status);
storeBitmap(index, bitmap);
};
});
}
}
/**
* Saving the downloaded images into file and after all the download of
* images be complete begin to populate widget as done previously
*/
private void storeBitmap(int index, Bitmap bitmap) {
FileManager.INSTANCE.storeBitmap(appWidgetId, bitmap,
listItemList.get(index).heading, getBaseContext());
count++;
Log.i("count",String.valueOf(count) + "::"+ Integer.toString(listItemList.size()));
if (count == listItemList.size()) {
count = 0;
populateWidget();
}
}
/**
* Method which sends broadcast to WidgetProvider so that widget is notified
* to do necessary action and here action == WidgetProvider.DATA_FETCHED
*/
private void populateWidget() {
Intent widgetUpdateIntent = new Intent();
widgetUpdateIntent.setAction(WidgetProvider.DATA_FETCHED);
widgetUpdateIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
appWidgetId);
sendBroadcast(widgetUpdateIntent);
this.stopSelf();
}
}
JSONfunctions.java
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONfunctions {
public static JSONObject getJSONfromURL(String url) {
InputStream is = null;
String result = "";
JSONObject jArray = null;
// Download JSON data from URL
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (Exception e) {
Log.e("log_tag", "Error in http connection " + e.toString());
}
// Convert response to string
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
Log.e("log_tag", "Error converting result " + e.toString());
}
try {
jArray = new JSONObject(result);
} catch (JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
return jArray;
}
}
Hope this helps someone and Great thanks to ( https://stackoverflow.com/users/739306/laaptu ) for the tutorials.
hi i am new learner of android and java.below this is my code. I having trouble to know where is the problem.
when i debug few times, it automatically enter debug mode after that. to fix that i have to restart the phone again. I check with other apps, it work just fine. just for the apps that i currently working on.
problem :
1. if i didn't enter data into the "dateTo" the program will stopped.
2. enter debug mode itself.
3. when i get the data from the array atList, then i key in another 'dateTo" to retrieve another data, but it doesn't replace the current data value. tq
package com.example.m2mai;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import org.json.JSONArray;
import org.json.JSONObject;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class RetrieveActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_retrieve);
}
public ArrayList<String> atList=new ArrayList<String>();
public ArrayList<String> dataList=new ArrayList<String>();
public void getStream(View v)
{
new MyAsyncTask().execute();
}
private class MyAsyncTask extends AsyncTask<String, Void, String>
{
protected String doInBackground(String... params)
{
return getData();
}
public long getDateTo()
{
EditText toText = (EditText)findViewById(R.id.dateTo);
String To = toText.getText().toString();
DateFormat dateFormatTo = new SimpleDateFormat("dd/MM/yyyy");
Date dateTo = null;
try {
dateTo = dateFormatTo.parse(To);
} catch (java.text.ParseException e) {
e.printStackTrace();
}
long timeTo = dateTo.getTime();
new Timestamp(timeTo);
return timeTo/1000;
}
protected String getData()
{
String toTS = ""+getDateTo();
String decodedString="";
String returnMsg="";
String request = "http://api.carriots.com/devices/{API_KEY}/streams/?order=-1&max=2&at_to="+toTS;
URL url;
HttpURLConnection connection = null;
try {
url = new URL(request);
connection = (HttpURLConnection) url.openConnection();
//establish the parameters for the http post request
connection.addRequestProperty("carriots.apikey", "somekey");
connection.addRequestProperty("Content-Type", "application/json");
connection.setRequestMethod("GET");
//create a buffered reader to interpret the incoming message from the carriots system
BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
while ((decodedString = in.readLine()) != null)
{
returnMsg+=decodedString;
}
in.close();
connection.disconnect();
JSONObject nodeRoot = new JSONObject(returnMsg);
JSONArray res = nodeRoot.getJSONArray("result");
for (int i = 0; i < res.length(); i++)
{
JSONObject childJSON = res.getJSONObject(i);
if (childJSON.get("data")!=null)
{
String value = childJSON.getString("data");
dataList.add(value);
JSONObject node=new JSONObject(value);
atList.add(node.get("temperature").toString());
}
}
}
catch (Exception e)
{
e.printStackTrace();
returnMsg=""+e;
}
//Log.d("returnMsg",returnMsg.toString());
return returnMsg;
}
protected void onPostExecute(String result)
{
//show the message returned from Carriots to the user
Toast.makeText(getApplicationContext(), result, Toast.LENGTH_LONG).show();
EditText myData1=(EditText)findViewById(R.id.editText1);
myData1.setText(atList.get(0));
EditText myData=(EditText)findViewById(R.id.editText2);
myData.setText(atList.get(1));
}
}
}
This line long timeTo = dateTo.getTime(); will throw a NullPointerException when the dateFormatTo.parse method throws a ParseException. This is going to happen when you come into the method with the To string not matching the specified format.
You're not exiting out of the flow so the long...getTime(); line runs, but dateTo is null resulting in a crash.
In the onPostExecute; you aren't verifying that atList has multiple elements. A JSON parse failure will leave atList empty and cause an index bounds exception for those 2 get calls.
These may not be the solutions to what you're seeing; but they will crash the app when these are hit in very likely situations; including the one you describe of an empty string for To.
As the comments mention; the logs will help see what's actually happening; but this is too big for a comment and those points are going to cause problems.
My current objective is to parse the Google Map API to return information about certain coordinates.
The main issue I am having is that I cannot get anything to display when I run the program. The code given below will run without any errors stopping the program, but will simply come up with a blank TextView. I am not very familiar with JSON parsing (this being the first program I've ever worked on with it) and I was wondering what was missing that was preventing the returned information to display on a TextView.
Is there a specific way to get the text to appear when parsing through JSON? I appreciate all the help.
My MainActivity.java class:
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.os.StrictMode;
import android.os.StrictMode.ThreadPolicy;
import android.widget.TextView;
public class MainActivity extends Activity {
// URL to make the request to
private static String url = "http://maps.googleapis.com/maps/api/geocode/json?latlng=40.1031,-75.1522&sensor=true";
// JSON Node names
private static final String TAG_LOCATION = "results";
private static final String TAG_CITY = "long_name";
// The JSON Array
JSONArray location = null;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ThreadPolicy tp = ThreadPolicy.LAX;
StrictMode.setThreadPolicy(tp);
// Creating JSON Parser instance
JSONParser jParser = new JSONParser();
// getting JSON string from URL
JSONObject json = jParser.getJSONFromUrl(url);
try {
// Getting Array of Location
location = json.getJSONArray(TAG_LOCATION);
// looping through each part of location
for(int i = 0; i < location.length(); i++){
JSONObject c = location.getJSONObject(i);
// Storing each JSON item in a variable
String city = c.getString(TAG_CITY);
// For whichever one works
System.out.println(city);
TextView textView = (TextView) findViewById(R.id.textView1);
textView.setText("City: " + city);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
My JSONParser.java class:
package com.example.finalproject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject getJSONFromUrl(String url) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
long_name key is in JSONObject which is in address_components JSONArray instead of JSONObject which is in results JSONArray so you should need to first get JSONArray from c JSONObject as:
for(int i = 0; i < location.length(); i++){
JSONObject c = location.getJSONObject(i);
// get address_components JSONArray from c
JSONArray add_array=c.getJSONArray("address_components");
for(int j = 0; j < add_array.length(); j++){
JSONObject obj_add = add_array.getJSONObject(i);
// Storing each JSON item in a variable
String city = c.getString(TAG_CITY);
//your code here....
}
}
and also use AsyncTask for getting data from weservice instead of doing network operations on Main UI Thread.
Here's some example code for using the Android/Google location API
http://developer.android.com/google/play-services/location.html
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationManager;
private void reverseGeocode()
{
AsyncTask< LatLng, Integer, List< Address > > task
= new AsyncTask< LatLng, Integer, List< Address > >()
{
#Override
protected List< Address > doInBackground( LatLng... params )
{
LatLng latLng = params[0];
Geocoder geoCoder = new Geocoder(getActivity().getApplicationContext() );
List< Address > matches = null;
try
{
matches = geoCoder.getFromLocation(latLng.latitude, latLng.longitude, 1);
}
catch ( IOException e )
{
e.printStackTrace();
}
return matches;
}
#Override
protected void onPostExecute( List< Address > result )
{
if ( result != null && result.size() > 0 )
{
if ( D ) Log.v( TAG, "onPostExecute result size=" + result.size() );
Address bestMatch = (result.isEmpty() ? null : result.get(0));
//showGeocodedAddress( bestMatch );
}
}
};
task.execute( latLng );
}
Hi i a m writing an application whih gets the current latitude and longitude and convert it to corrsponding address.i can get the lattitude and longitutde but how to convert it to the corresponding address using json. i am new to json. i tried some sample codes butnot getting the address
This is my code
import java.io.IOException;
import java.util.List;
import java.util.Locale;
import android.content.Context;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.view.Menu;
import android.widget.Toast;
import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.LatLngBounds;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.maps.GeoPoint;
public class GMapActivity extends FragmentActivity {
private GoogleMap map;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
LocationManager locManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
LocationListener locListener = new GpsActivity(getBaseContext());
locManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, locListener);
if (map == null) {
map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
map.setMyLocationEnabled(true);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.map, menu);
return true;
}
private class GpsActivity implements LocationListener{
Marker marker;
Context mcontext;
public GpsActivity(Context context){
super();
mcontext=context;
}
#Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
if (location != null) {
double latitude=location.getLatitude();
double longitude=location.getLongitude();
LatLng gpslocation=new LatLng(latitude,longitude);
Toast.makeText(getApplicationContext(),"" +gpslocation,
Toast.LENGTH_LONG).show();
pls help me
thanks in advance
To change back human readable format, you can also use Geocoder but that is not working sometimes because google play service problem. I used this json geocodeing as second option for in case.
Please refer Google Geocoding API
Workflow is pass your latitude and longitude and get current location. Request url gonna be like this.
String reqURL = "http://maps.googleapis.com/maps/api/geocode/json?latlng="+ lat+","+lng +"&sensor=true";
Hopefully, this answer will help you.
public static JSONObject getLocationInfo(double lat, double lng) {
HttpGet httpGet = new HttpGet("http://maps.googleapis.com/maps/api/geocode/json?latlng="+ lat+","+lng +"&sensor=true");
HttpClient client = new DefaultHttpClient();
HttpResponse response;
StringBuilder stringBuilder = new StringBuilder();
try {
response = client.execute(httpGet);
HttpEntity entity = response.getEntity();
InputStream stream = entity.getContent();
int b;
while ((b = stream.read()) != -1) {
stringBuilder.append((char) b);
}
} catch (ClientProtocolException e) {
} catch (IOException e) {
}
JSONObject jsonObject = new JSONObject();
try {
jsonObject = new JSONObject(stringBuilder.toString());
} catch (JSONException e) {
e.printStackTrace();
}
return jsonObject;
}
public static String getCurrentLocationViaJSON(double lat, double lng) {
JSONObject jsonObj = getLocationInfo(lat, lng);
Log.i("JSON string =>", jsonObj.toString());
String currentLocation = "testing";
String street_address = null;
String postal_code = null;
try {
String status = jsonObj.getString("status").toString();
Log.i("status", status);
if(status.equalsIgnoreCase("OK")){
JSONArray results = jsonObj.getJSONArray("results");
int i = 0;
Log.i("i", i+ "," + results.length() ); //TODO delete this
do{
JSONObject r = results.getJSONObject(i);
JSONArray typesArray = r.getJSONArray("types");
String types = typesArray.getString(0);
if(types.equalsIgnoreCase("street_address")){
street_address = r.getString("formatted_address").split(",")[0];
Log.i("street_address", street_address);
}else if(types.equalsIgnoreCase("postal_code")){
postal_code = r.getString("formatted_address");
Log.i("postal_code", postal_code);
}
if(street_address!=null && postal_code!=null){
currentLocation = street_address + "," + postal_code;
Log.i("Current Location =>", currentLocation); //Delete this
i = results.length();
}
i++;
}while(i<results.length());
Log.i("JSON Geo Locatoin =>", currentLocation);
return currentLocation;
}
} catch (JSONException e) {
Log.e("testing","Failed to load JSON");
e.printStackTrace();
}
return null;
}
As my experience, only device generated latitude and longitude will work.
Then call
String currentLocation = getCurrentLocationViaJSON(lat, lng);
i am working on an app using json parsing...in this parsing is done by json of the given url.
As i run my project on emulator having target = "Google APIs (Google Inc.) - API level 10"
then it runs properly and shows needed results from the target url.
but when run my project on emulator having target = "Google APIs (Google Inc.) - API level 16"
then it shows error and it never parse the given url data and get force close.
i want to make app which run on every API level.
please help...
here's my code:
json parser class:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
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 android.util.Log;
public class JSONParser {
static InputStream is = null;
static JSONArray jObj = null;
static String json = "";
static String req = "POST";
// constructor
public JSONParser() {
}
public JSONArray getJSONFromUrl(String url, String method) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpResponse httpResponse = null;
if(method == req) {
HttpPost httpC = new HttpPost(url);
httpResponse = httpClient.execute(httpC);
}else {
HttpGet httpC = new HttpGet(url);
httpResponse = httpClient.execute(httpC);
}
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONArray(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
Another class using json parser class snd fetch data:
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListAdapter;
import android.widget.SimpleAdapter;
public class showData extends ListActivity{
public static String url = "http://something/something/";
public static final String TAG_A = "a";
public static final String TAG_B = "b";
public static final String TAG_C = "c";
public static final String TAG_D = "d";
public static final String TAG_E = "e";
public static final String TAG_F = "f";
public static final String GET = "get";
JSONArray Data1 = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();
EditText editext_text = (EditText) findViewById(R.id.et);
String urlnew = url + editext_text.getText().toString();
Log.d("url", urlnew);
JSONParser jParser = new JSONParser();
// getting JSON string from URL
area1 = jParser.getJSONFromUrl(urlnew, GET);
Log.d("Json String", area1.toString());
try {
for(int i = 0; i < area1.length(); i++){
JSONObject c = area1.getJSONObject(i);
// Storing each json item in variable
String a = c.getString(TAG_A);
String b = c.getString(TAG_B);
String c = c.getString(TAG_C);
String d = c.getString(TAG_D);
String e = c.getString(TAG_E);
HashMap<String,String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_A, a);
map.put(TAG_B, b);
map.put(TAG_C, c);
map.put(TAG_D, d);
map.put(TAG_E, e);
// adding HashList to ArrayList
contactList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
ListAdapter adapter = new SimpleAdapter(this, contactList,
R.layout.list_item_area,
new String[] { TAG_B, TAG_A, TAG_C, TAG_D, TAG_E }, new int[] {
R.id.b, R.id.a, R.id.c, R.id.d, R.id.e });
setListAdapter(adapter);
}
}
You are getting a NetworkOnMainThreadException because as the name is self-explaining, you are doing network request on UI Thread that will make your application laggy and create an horrible experience.
The exception that is thrown when an application attempts to perform a
networking operation on its main thread.
This is only thrown for applications targeting the Honeycomb SDK or
higher. Applications targeting earlier SDK versions are allowed to do
networking on their main event loop threads, but it's heavily
discouraged. See the document Designing for Responsiveness.
You should use Threads or AsyncTask, do you need some explanations on how to use them?
private class NetworkTask extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... params) {
//DO YOUR STUFF
}
#Override
protected void onPostExecute(String result) {
//Update UI
}
#Override
protected void onPreExecute() {
}
#Override
protected void onProgressUpdate(Void... values) {
}
}
This is Network On Main Thread Exception, You have to use Thread for network connection, because the main thread is UI thread will not give any response for Network connection. Use separate thread for network connection