Develop Reference

Run a piece of code only once in background whenever user login

Ia trying to get user locations whenever its login the application.I made a class and its working perfect seperately but when I embed it in my main project it didnt submit the location values in database.I want that whenever user login that class run for only once and submits its coordinates in database.
Here Is the code of my location class :
I want that when user login this class class run for once only all I want is to get user location when its loged in.
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import java.util.HashMap;
import java.util.Map;
public class getposition extends AppCompatActivity {
String URL_LOGIN = "api"
Button btn;
TextView tv1,tv2;
LocationManager locationManager;
static final int REQUEST_LOCATION = 1;
String lg, lt , chk;
String lat_long;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_getposition);
btn = findViewById(R.id.send);
tv1 = findViewById(R.id.lang);
tv2 = findViewById(R.id.lat);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
chk = getLocation();
loadlocation();
if(chk != "false"){
String foo = chk;
String[] split = foo.split("_");
lt = split[0];
lg = split[1];
Toast.makeText(getApplicationContext(),chk,Toast.LENGTH_LONG).show();
}
}
private void loadlocation() {
final RequestQueue requestQueue = Volley.newRequestQueue(getposition.this);
StringRequest stringRequest = new StringRequest(Request.Method.POST, URL_LOGIN, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
tv1.setText(response);
tv2.setText(response);
requestQueue.stop();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
tv1.setText("Something went wrong///");
error.printStackTrace();
requestQueue.stop();
}
})
{
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("user_id","12" );
params.put("user_lat", lt);
params.put("user_lng", lg);
return params;
}
};
VolleySingleton.getInstance(getposition.this).addToRequestQueue(stringRequest);
}
public String getLocation() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
!= PackageManager.PERMISSION_GRANTED)
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION);
else {
Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
double latt = location.getLatitude();
double lng = location.getLongitude();
lat_long = latt + "_" + lng;
tv1.setText("Latitude: " + latt);
tv2.setText("Longitude: " + lng);
} else {
lat_long = "false";
tv1.setText("Unable to find correct location.");
tv2.setText("Unable to find correct location. ");
}
}
return lat_long;
}
}
This is my login class:
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;
import com.vshine.neuron.riseshine.VolleySingleton;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.vshine.neuron.riseshine.MainActivity;
import com.vshine.neuron.riseshine.R;
import com.vshine.neuron.riseshine.getregistered;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.HashMap;
import java.util.Map;
public class login extends AppCompatActivity {
Button login_button;
ImageButton GetRegistered;
EditText userName_edt, password_edt;
String user_name, password;
Context mctx;
String json_response;
String URL_LOGIN = "api"
public static final String PREFS_NAME = "MyPreferenceFiles";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
mctx = this;
initBasic();
initLogin();
}
private void initBasic() {
login_button = (Button) findViewById(R.id.login_button);
GetRegistered = (ImageButton) findViewById(R.id.register);
userName_edt = (EditText) findViewById(R.id.user_name);
password_edt = (EditText) findViewById(R.id.password);
}
private void initLogin() {
GetRegistered.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent= new Intent(login.this,getregistered.class);
startActivity(intent);
}
});
login_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
user_name = userName_edt.getText().toString();
password = password_edt.getText().toString();
if (user_name.trim().equals("") || password.trim().equals("")) {
ShowToastMessage("Please enter the credentials properly");
}
else {
StringRequest stringRequest = new StringRequest(Request.Method.POST, URL_LOGIN,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
//converting response to json object
JSONObject obj = new JSONObject(response);
//if no error in response
// json_response = j_obj.getString("message");
if (response!= null) {
// Toast.makeText(getApplicationContext(), obj.getString("message"), Toast.LENGTH_SHORT).show();
json_response = obj.getString("message");
// ShowToastMessage(json_response);
//getting the user from the response
JSONObject userJson = obj.getJSONObject("response");
//creating a new user object
String u_id = String.valueOf(userJson.getInt("id"));
// ShowToastMessage(u_id);
//storing the user in shared preferences
SharedPreferences.Editor editor = getSharedPreferences(PREFS_NAME, MODE_PRIVATE).edit();
editor.putString("User_id", u_id);
editor.commit();
finish();
startActivity(new Intent(getApplicationContext(), MainActivity.class));
} else {
Toast.makeText(getApplicationContext(), obj.getString("message"), Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_SHORT).show();
}
})
{
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("user_name", user_name);
params.put("password", password);
return params;
}
};
VolleySingleton.getInstance(login.this).addToRequestQueue(stringRequest);
}
}
});
}
private void ShowToastMessage(String message) {
Toast.makeText(this, message, Toast.LENGTH_LONG).show();
}
}

populating json data inside Googlemap

I made a lot of research on this topic but couldn't find an appropriate solution.
I simply have an api which include school name and its latitude,longitude.
[
{
"id":1,
"name":"Little Angels Higher Secondary School",
"latitude":27.6514,
"longitude":85.3359
},
{
"id":6,
"name":"Baltimore Secondary School",
"latitude":27.6514,
"longitude":85.3359
}
]
I parsed this api data.Using GPStracker class I successfully included a marker on google map at my current location.Now I want to add a marker to all the school location in that google map so that I can know the nearest school to me once I open the google map.This is all what I did how ever it shows null pointer exception.
package com.example.user.educationhunt.fragment;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.location.Location;
import android.location.LocationManager;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonArrayRequest;
import com.example.user.educationhunt.R;
import com.example.user.educationhunt.SchoolDetails;
import com.example.user.educationhunt.adapter.CustomListAdapter;
import com.example.user.educationhunt.pojos.AppController;
import com.example.user.educationhunt.pojos.FeeClass;
import com.example.user.educationhunt.pojos.GpsLocation;
import com.example.user.educationhunt.pojos.MySchool;
import com.example.user.educationhunt.pojos.OurSchool;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapView;
import com.google.android.gms.maps.MapsInitializer;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
/**
* A simple {#link Fragment} subclass.
*/
public class NearMe extends Fragment {
MapView mMapView;
private GoogleMap googleMap;
GpsLocation gpsLocation;
double longitude, latitude;
private ProgressDialog pDialog;
private RadioButton radioSexButton;
ArrayList al = new ArrayList();
MySchool mySchool;
Marker place;
LatLng current_location ;
private static final String TAG = NearMe.class.getSimpleName();
private static final String url = "http://www.myeducationhunt.com/api/v1/schools";
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_near_me, container, false);
radioSexButton = (RadioButton) v.findViewById(R.id.radioSchool);
if (isConnected()) {
mMapView = (MapView) v.findViewById(R.id.mapView);
mMapView.onCreate(savedInstanceState);
mMapView.onResume();
try {
MapsInitializer.initialize(getActivity().getApplicationContext());
} catch (Exception e) {
e.printStackTrace();
}
gpsLocation = new GpsLocation(getContext());
if (gpsLocation.canGetLocation()) {
longitude = gpsLocation.getLongitude();
latitude = gpsLocation.getLatitude();
Toast.makeText(getContext(), "latitude:" + latitude + "Longitude:" + longitude, Toast.LENGTH_LONG).show();
}
pDialog = new ProgressDialog(getContext());
pDialog.setMessage("Loading…");
pDialog.show();
JsonArrayRequest schoolRequest = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
mySchool = new MySchool();
mySchool.setId(""+obj.getInt("id"));
mySchool.setName(""+obj.getString("name"));
mySchool.setLatitude(Double.parseDouble(""+obj.getDouble("latitude")));
mySchool.setLongitude(Double.parseDouble(""+obj.getDouble("longitude")));
al.add(mySchool);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(schoolRequest);
mMapView.getMapAsync(new OnMapReadyCallback() {
#Override
public void onMapReady(GoogleMap mMap) {
googleMap = mMap;
LatLng schoollatlng = new LatLng(latitude, longitude);
googleMap.addMarker(new MarkerOptions().position(schoollatlng).title("MyLocation"));
CameraPosition cameraPosition = new CameraPosition.Builder().target(schoollatlng).zoom(10).build();
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
LatLng latlng = new LatLng(mySchool.getLatitude(), mySchool.getLongitude());
googleMap.addMarker(new MarkerOptions().position(latlng).title(mySchool.getName()));
CameraPosition cameraPosition1 = new CameraPosition.Builder().target(latlng).zoom(10).build();
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition1));
}
});
} else {
Toast.makeText(getContext(), "Please check your internet connection", Toast.LENGTH_LONG).show();
}
return v;
}
public boolean isConnected() {
ConnectivityManager connMgr = (ConnectivityManager) getActivity().getSystemService(Activity.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected())
return true;
else
return false;
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
}
Is there any one to help me?Please Help.Thanks in advance
This is MySchool class
package com.example.user.educationhunt.pojos;
/**
* Created by user on 12/28/2016.
*/
public class MySchool {
String id;
String name;
double latitude;
double longitude;
public String getId() {
return id;
}
public String getName() {
return name;
}
public double getLatitude() {
return latitude;
}
public double getLongitude() {
return longitude;
}
public void setId(String id) {
this.id = id;
}
public void setLatitude(double latitude) {
this.latitude = latitude;
}
public void setName(String name) {
this.name = name;
}
public void setLongitude(double longitude) {
this.longitude = longitude;
}
}
This is my error log
FATAL EXCEPTION: main
Process: com.example.user.educationhunt, PID: 20472
java.lang.NullPointerException: Attempt to invoke virtual method 'double com.example.user.educationhunt.pojos.MySchool.getLatitude()' on a null object reference
at com.example.user.educationhunt.fragment.NearMe$3.onMapReady(NearMe.java:159)
at com.google.android.gms.maps.MapView$zza$1.zza(Unknown Source)
at com.google.android.gms.maps.internal.zzt$zza.onTransact(Unknown Source)
at android.os.Binder.transact(Binder.java:387)
at zu.a(:com.google.android.gms.DynamiteModulesB:82)
at maps.ad.t$5.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7325)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
12-28 10:06:05.046 20472-21276/com.example.user.educationhunt I/qtaguid: Untagging socket 81

Your school marker should run after google complete initialized. Below are the code sample.
mMapView.getMapAsync(new OnMapReadyCallback() {
#Override
public void onMapReady(GoogleMap mMap) {
googleMap = mMap;
LatLng schoollatlng = new LatLng(latitude, longitude);
googleMap.addMarker(new MarkerOptions().position(schoollatlng).title("MyLocation"));
CameraPosition cameraPosition = new CameraPosition.Builder().target(schoollatlng).zoom(10).build();
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
drawSchoolMarker();
}
});
Create new method in the class
private void drawSchoolMarker(){
JsonArrayRequest schoolRequest = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
MySchool school = new MySchool();
school.setId(""+obj.getInt("id"));
school.setName(""+obj.getString("name"));
school.setLatitude(Double.parseDouble(""+obj.getDouble("latitude")));
school.setLongitude(Double.parseDouble(""+obj.getDouble("longitude")));
al.add(school);
} catch (JSONException e) {
e.printStackTrace();
}
}
//iterate from arraylist
for(MySchool school : al){
LatLng latlng = new LatLng(school.getLatitude(), school.getLongitude());
googleMap.addMarker(new MarkerOptions().position(latlng).title(school.getName()));
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(schoolRequest);
}
I didn't test the code but it should work.

After reading all school locations do some thing like by using your Array List
Marker place;
LatLng current_location ;
for(int i = 0; i < al.size(); i++){
current_location = new LatLng(Double.parseDouble(al.get(i).getLatitude()),Double.parseDouble(al.get(i).getLongitude()));
place= map.addMarker(new MarkerOptions().position(current_location).title("school name here"));
}

You should get NullPointerException in the line:
LatLng latlng = new LatLng(ourSchool.latitude, ourSchool.longitude);
because ourSchool is pointing to Null. You have added all the ourSchool objects in the ArrayList "al" like : al.add(ourSchool)
now try to iterate from the ArrayList "al" after adding the data in the ArrayList.
Also your below code is running before the getting response from the url and your "ourSchool" not initialise till that time.
mMapView.getMapAsync(new OnMapReadyCallback() {
#Override
public void onMapReady(GoogleMap mMap) {
googleMap = mMap;
LatLng schoollatlng = new LatLng(latitude, longitude);
googleMap.addMarker(new MarkerOptions().position(schoollatlng).title("MyLocation"));
CameraPosition cameraPosition = new CameraPosition.Builder().target(schoollatlng).zoom(10).build();
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
LatLng latlng = new LatLng(ourSchool.latitude, ourSchool.longitude);
googleMap.addMarker(new MarkerOptions().position(latlng).title(ourSchool.schoolName));
CameraPosition cameraPosition1 = new CameraPosition.Builder().target(latlng).zoom(10).build();
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition1));
}
});
OurSchool class:
class OurSchool{
String id;
String name;
double latitude;
double longitude;
public void setId(String id){
this.id=id;
}
public String getId(){
return id;
}
public void setName(String name){
this.name=name;
}
public String getName(){
return name;
}
public void setLatitude(double latitude){
this.latitute=latitude;
}
public double getLatitude(){
return latitude;
}
public void setLongitude(String longitude){
this.longitude=longitude;
}
public double getLongitude(){
return longitude;
}
}
then set value in OurSchool class object like:
ourSchool.setId(""+obj.getInt("id"));
in place of
ourSchool.schoolId = obj.getInt("id");
same way set values for other also

JSON data returned as null when accessing OpenWeatherMap api

Getting into android and have been trying to follow the following tutorial for a weather app udated with the OpenWeatherMap api http://code.tutsplus.com/tutorials/create-a-weather-app-on-android--cms-21587
I'm currently having trouble with the following class; the JSON object returned when the getJSON() method is called is always null resulting in no weather displayed. The URL works and I'm not sure what I'm doing wrong; I think I may have some kind of issue with the connection.addRequestProperty line. I am not sure if the API key is actually required for this JSON parse, as you can get the results in your browser without it eg. http://api.openweathermap.org/data/2.5/weather?q=London&units=metric
If anyone has any insight into where I am going wrong it would be very much appreciated!
EDIT: if anyone needs to see the rest of the package it is all currently identical to the code contained in the link posted.
EDIT 2: added the logcat created after dieter_h's suggested changes, thanks man.
LOGCAT:
08-20 23:20:55.219 12169-12169/? I/art﹕ Late-enabling -Xcheck:jni
08-20 23:20:55.587 12169-12191/simpleweather.ockmore.will.simpleweather D/OpenGLRenderer﹕ Use EGL_SWAP_BEHAVIOR_PRESERVED: true
08-20 23:20:55.598 12169-12169/simpleweather.ockmore.will.simpleweather D/Atlas﹕ Validating map...
08-20 23:20:55.659 12169-12188/simpleweather.ockmore.will.simpleweather I/myActivity﹕ data{"cod":"404","message":"Error: Not found city"}
08-20 23:20:55.671 12169-12191/simpleweather.ockmore.will.simpleweather I/Adreno-EGL﹕ <qeglDrvAPI_eglInitialize:410>: EGL 1.4 QUALCOMM build: AU_LINUX_ANDROID_LA.AF.1.1_RB1.05.00.02.006.020_msm8960_LA.AF.1.1_RB1__release_AU ()
OpenGL ES Shader Compiler Version: E031.25.03.06
Build Date: 03/30/15 Mon
Local Branch: mybranch8688311
Remote Branch: quic/LA.AF.1.1_rb1.16
Local Patches: NONE
Reconstruct Branch: AU_LINUX_ANDROID_LA.AF.1.1_RB1.05.00.02.006.020 + 9b2699f + 2215637 + 60aa592 + f2362e6 + 5c64f59 + 82411a1 + 1f36e07 + NOTHING
08-20 23:20:55.673 12169-12191/simpleweather.ockmore.will.simpleweather I/OpenGLRenderer﹕ Initialized EGL, version 1.4
08-20 23:20:55.707 12169-12191/simpleweather.ockmore.will.simpleweather D/OpenGLRenderer﹕ Enabling debug mode 0
08-20 23:20:55.809 12169-12169/simpleweather.ockmore.will.simpleweather E/SimpleWeather﹕ One or more fields not found in JSON data
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import org.json.JSONObject;
import android.content.Context;
import android.util.Log;
public class RemoteFetch {
public static JSONObject getJSON(Context context, String city){
try {
URL url = new URL("http://api.openweathermap.org/data/2.5/weather?q=" +city+ "&units=metric");
HttpURLConnection connection =
(HttpURLConnection)url.openConnection();
connection.addRequestProperty("x-api-key",
context.getString(R.string.open_weather_maps_app_id));
BufferedReader reader = new BufferedReader(
new InputStreamReader(connection.getInputStream()));
StringBuilder json = new StringBuilder(1024);
String tmp=" ";
while ((tmp=reader.readLine())!=null)
json.append(tmp).append("\n");
reader.close();
JSONObject data = new JSONObject(json.toString());
//This value will be 404 if the request was not
//successful
if (data.getInt("cod")!=200){
return null;
}
return data;
}catch(Exception e) {
return null;
}
}
}
EDIT 3: Fragment and Activity classes added below
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import android.os.Handler;
import org.json.JSONObject;
import java.text.DateFormat;
import java.util.Date;
import java.util.Locale;
public class WeatherFragment extends Fragment{
Typeface weatherFont;
TextView cityField;
TextView updatedField;
TextView detailsField;
TextView currentTemperatureField;
TextView weatherIcon;
Handler handler;
public WeatherFragment(){
handler = new Handler();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_weather, container, false);
cityField = (TextView)rootView.findViewById(R.id.city_field);
updatedField = (TextView)rootView.findViewById(R.id.updated_field);
detailsField = (TextView)rootView.findViewById(R.id.details_field);
currentTemperatureField = (TextView)rootView.findViewById(R.id.current_temperature_field);
weatherIcon = (TextView)rootView.findViewById(R.id.weather_icon);
weatherIcon.setTypeface(weatherFont);
return rootView;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
weatherFont = Typeface.createFromAsset(getActivity().getAssets(), "fonts/weather.ttf");
updateWeatherData(new CityPreference(getActivity()).getCity());
}
private void updateWeatherData(final String city){
new Thread(){
public void run(){
final JSONObject json = RemoteFetch.getJSON(getActivity(), city);
if (json == null){
handler.post(new Runnable(){
public void run(){
Toast.makeText(getActivity(),
getActivity().getString(R.string.place_not_found),
Toast.LENGTH_LONG).show();
}
});
} else {
handler.post(new Runnable(){
#Override
public void run() {
renderWeather(json);
}
});
}
}
}.start();
}
private void renderWeather(JSONObject json){
try {
cityField.setText(json.getString("name").toUpperCase(Locale.UK) +
"," +
json.getJSONObject("sys").getString("country"));
JSONObject details = json.getJSONArray("weather").getJSONObject(0);
JSONObject main = json.getJSONObject("main");
detailsField.setText(
details.getString("description").toUpperCase(Locale.UK) +
"\n" + "Humidity: " + main.getString("humidity") + "%" +
"\n" + "Pressure: " + main.getString("pressure") + "hPa");
currentTemperatureField.setText(
String.format("%.2f", main.getDouble("temp")) + " ℃");
DateFormat df = DateFormat.getDateInstance();
String updatedOn = df.format(new Date(json.getLong("dt")*1000));
updatedField.setText("Last update: " + updatedOn);
setWeatherIcon(details.getInt("id"),
json.getJSONObject("sys").getLong("sunrise") * 1000,
json.getJSONObject("sys").getLong("sunset") * 1000);
}catch (Exception e) {
Log.e("SimpleWeather", "One or more fields not found in JSON data");
}
}
private void setWeatherIcon(int actualId, long sunrise, long sunset){
int id = actualId / 100;
String icon = "";
if(actualId == 800){
long currentTime = new Date().getTime();
if (currentTime>=sunrise && currentTime<sunset) {
icon = getActivity().getString(R.string.weather_sunny);
} else {
icon = getActivity().getString(R.string.weather_clear_night);
}
} else {
switch (id) {
case 2 : icon = getActivity().getString(R.string.weather_thunder);
break;
case 3 : icon = getActivity().getString(R.string.weather_drizzle);
break;
case 7 : icon = getActivity().getString(R.string.weather_foggy);
break;
case 8 : icon = getActivity().getString(R.string.weather_cloudy);
break;
case 6 : icon = getActivity().getString(R.string.weather_snowy);
break;
case 5 : icon = getActivity().getString(R.string.weather_rainy);
break;
}
weatherIcon.setText(icon);
}
}
public void changeCity(String city){
updateWeatherData(city);
}
Formatting is a bit odd, sorry.
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.InputType;
import android.view.Menu;
import android.view.MenuItem;
import android.support.v4.app.Fragment;
import android.widget.EditText;
public class WeatherActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_weather);
if(savedInstanceState == null){
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new WeatherFragment())
.commit();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_weather, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.change_city) {
showInputDialog();
}
return false;
}
private void showInputDialog(){
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Change city");
final EditText input = new EditText(this);
input.setInputType(InputType.TYPE_CLASS_TEXT);
builder.setView(input);
builder.setPositiveButton("Go", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
changeCity(input.getText().toString());
}
});
builder.show();
}
public void changeCity(String city){
WeatherFragment wf = (WeatherFragment)getSupportFragmentManager()
.findFragmentById(R.id.container);
wf.changeCity(city);
new CityPreference(this).setCity(city);
}
}

Try this, Add this after while loop.
finally
{
try {
if (reader != null)
reader.close();
}// end try
catch (IOException ex)
{
}// end catch
}//end finally.

Change code and post your logcat:
JSONObject data = new JSONObject(json.toString());
Log.i("MyActivity", "data + " data);
[...]
return data;
}catch(Exception e) {
Log.e("MyActivity", "Exception", e.fillInStackTrace());
return null;
}

Please use addRequestProperty to setRequestProperty:
connection.setRequestProperty("x-api-key",
context.getString(R.string.open_weather_maps_app_id));
instead of:
connection.addRequestProperty("x-api-key",
context.getString(R.string.open_weather_maps_app_id));

toast mesage not shown on screen when network or server not available

I need to show toast message when the server is not responding
when I press the login button, some parameters are passed to AgAppMenu screen which use url connection to server and get xml response in AgAppHelperMethods screen. The
probelm is when the server is busy or the network is not avaibale, I can't show toast message on catch block although it shows the log message.
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent ;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class LoginScreen extends Activity implements OnClickListener {
EditText mobile;
EditText pin;
Button btnLogin;
Button btnClear;
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.agapplogin);
TextView lblMobileNo = (TextView) findViewById(R.id.lblMobileNo);
lblMobileNo.setTextColor(getResources()
.getColor(R.color.text_color_red));
mobile = (EditText) findViewById(R.id.txtMobileNo);
TextView lblPinNo = (TextView) findViewById(R.id.lblPinNo);
lblPinNo.setTextColor(getResources().getColor(R.color.text_color_red));
pin = (EditText) findViewById(R.id.txtPinNo);
btnLogin = (Button) findViewById(R.id.btnLogin);
btnClear = (Button) findViewById(R.id.btnClear);
btnLogin.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
postLoginData();
}
});
btnClear.setOnClickListener(new OnClickListener() {
public void onClick(View v)
{
cleartext();
}
});
/*
*
* btnClear.setOnClickListener(new OnClickListener() { public void
* onClick(View arg0) {
*
* } });
*/
}
public void postLoginData()
{
if (pin.getTextSize() == 0 || mobile.getTextSize() == 0) {
AlertDialog.Builder altDialog = new AlertDialog.Builder(this);
altDialog.setMessage("Please Enter Complete Information!");
} else {
Intent i = new Intent(this.getApplicationContext(), AgAppMenu.class);
Bundle bundle = new Bundle();
bundle.putString("mno", mobile.getText().toString());
bundle.putString("pinno", pin.getText().toString());
i.putExtras(bundle);
startActivity(i);
}
}
#Override
public void onClick(View v) {
}
public void cleartext() {
{
pin.setText("");
mobile.setText("");
}
}
}
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class AgAppMenu extends Activity {
String mno, pinno;
private String[][] xmlRespone;
Button btnMiniStatement;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.agappmenu);
mno = getIntent().getExtras().getString("mno");
pinno = getIntent().getExtras().getString("pinno");
setTitle("Welcome to the Ag App Menu");
AgAppHelperMethods agapp =new AgAppHelperMethods();
// xmlRespone = AgAppHelperMethods.AgAppXMLParser("AG_IT_App/AgMainServlet?messageType=LOG&pin=" + pinno + "&mobile=" + mno + "&source=" + mno + "&channel=INTERNET");
xmlRespone = agapp.AgAppXMLParser("AG_IT_App/AgMainServlet?messageType=LOG&pin=" + pinno + "&mobile=" + mno + "&source=" + mno + "&channel=INTERNET");
import java.net.URL;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
import android.view.View;
import android.view.View.OnKeyListener;
public class AgAppHelperMethods extends Activity {
private static final String LOG_TAG = null;
private static AgAppHelperMethods instance = null;
public static String varMobileNo;
public static String varPinNo;
String[][] xmlRespone = null;
boolean flag = true;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.agapphelpermethods);
}
protected AgAppHelperMethods() {
}
public static AgAppHelperMethods getInstance() {
if (instance == null) {
instance = new AgAppHelperMethods();
}
return instance;
}
public static String getUrl() {
String url = "https://demo.accessgroup.mobi/";
return url;
}
public String[][] AgAppXMLParser(String parUrl) {
String _node, _element;
String[][] xmlRespone = null;
try {
String url = AgAppHelperMethods.getUrl() + parUrl;
URL finalUrl = new URL(url);
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new InputSource(finalUrl.openStream()));
doc.getDocumentElement().normalize();
NodeList list = doc.getElementsByTagName("*");
_node = new String();
_element = new String();
xmlRespone = new String[list.getLength()][2];
// this "for" loop is used to parse through the
// XML document and extract all elements and their
// value, so they can be displayed on the device
for (int i = 0; i < list.getLength(); i++) {
Node value = list.item(i).getChildNodes().item(0);
_node = list.item(i).getNodeName();
_element = value.getNodeValue();
xmlRespone[i][0] = _node;
xmlRespone[i][1] = _element;
}// end for
throw new ArrayIndexOutOfBoundsException();
}// end try
// will catch any exception thrown by the XML parser
catch (Exception e) {
Toast.makeText(AgAppHelperMethods.this,
"error server not responding " + e.getMessage(),
Toast.LENGTH_SHORT).show();
Log.e(LOG_TAG, "CONNECTION ERROR FUNDAMO SERVER NOT RESPONDING", e);
}
// Log.e(LOG_TAG, "CONNECTION ERROR FUNDAMO SERVER NOT RESPONDING", e);
return xmlRespone;
}
`

AgAppHelperMethods isn't really an Activity. You've derived this class from Activity, but then you've created Singleton management methods (getInstance()) and you are instantiating it yourself. This is bad. Don't do this.
Normally Android controls the instantiation of activities. You don't ever create one yourself (with new).
It looks to me like AgAppHelperMethods just needs to be a regular Java class. It doesn't need to inherit from anything. Remove also the lifecycle methods like onCreate().
Now you will have a problem with the toast, because you need a context for that and AgAppHelperMethods isn't a Context. To solve that you can add Context as a parameter to AgAppXMLParser() like this:
public String[][] AgAppXMLParser(Context context, String parUrl) {
...
// Now you can use "context" to create your toast.
}
When you call AgAppXMLParser() from AgAppMenu just pass "this" as the context parameter.

Customize the android maps places?

I want show the maps of my places, based on a selection of area like business,favorites, etc.
I am using the following intent for search and display the result in the maps in Android
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://maps.google.com/maps"));
startActivity(intent);
When I click the maps place as favorites it shows that place in my places.
How can I divide the places based on category in Android?

You should use the place api for getting the selection of area.
Step by step,
How to get the list of nearest place of a location.
Step 1 : Go to API Console for obtaining the Place API
https://code.google.com/apis/console/
and select on services tab
on the place service
now select API Access tab and get the API KEY
now you have a API key for getting place
Now in programming
*Step 2 * : first create a class named Place.java. This class is used to contain the property of place which are provided by Place api.
package com.android.code.GoogleMap.NearsetLandmark;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.json.JSONException;
import org.json.JSONObject;
public class Place {
private String id;
private String icon;
private String name;
private String vicinity;
private Double latitude;
private Double longitude;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getIcon() {
return icon;
}
public void setIcon(String icon) {
this.icon = icon;
}
public Double getLatitude() {
return latitude;
}
public void setLatitude(Double latitude) {
this.latitude = latitude;
}
public Double getLongitude() {
return longitude;
}
public void setLongitude(Double longitude) {
this.longitude = longitude;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getVicinity() {
return vicinity;
}
public void setVicinity(String vicinity) {
this.vicinity = vicinity;
}
static Place jsonToPontoReferencia(JSONObject pontoReferencia) {
try {
Place result = new Place();
JSONObject geometry = (JSONObject) pontoReferencia.get("geometry");
JSONObject location = (JSONObject) geometry.get("location");
result.setLatitude((Double) location.get("lat"));
result.setLongitude((Double) location.get("lng"));
result.setIcon(pontoReferencia.getString("icon"));
result.setName(pontoReferencia.getString("name"));
result.setVicinity(pontoReferencia.getString("vicinity"));
result.setId(pontoReferencia.getString("id"));
return result;
} catch (JSONException ex) {
Logger.getLogger(Place.class.getName()).log(Level.SEVERE, null, ex);
}
return null;
}
#Override
public String toString() {
return "Place{" + "id=" + id + ", icon=" + icon + ", name=" + name + ", latitude=" + latitude + ", longitude=" + longitude + '}';
}
}
Now create a class named PlacesService
package com.android.code.GoogleMap.NearsetLandmark;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class PlacesService {
private String API_KEY;
public PlacesService(String apikey) {
this.API_KEY = apikey;
}
public void setApiKey(String apikey) {
this.API_KEY = apikey;
}
public List<Place> findPlaces(double latitude, double longitude,String placeSpacification)
{
String urlString = makeUrl(latitude, longitude,placeSpacification);
try {
String json = getJSON(urlString);
System.out.println(json);
JSONObject object = new JSONObject(json);
JSONArray array = object.getJSONArray("results");
ArrayList<Place> arrayList = new ArrayList<Place>();
for (int i = 0; i < array.length(); i++) {
try {
Place place = Place.jsonToPontoReferencia((JSONObject) array.get(i));
Log.v("Places Services ", ""+place);
arrayList.add(place);
} catch (Exception e) {
}
}
return arrayList;
} catch (JSONException ex) {
Logger.getLogger(PlacesService.class.getName()).log(Level.SEVERE, null, ex);
}
return null;
}
//https://maps.googleapis.com/maps/api/place/search/json?location=28.632808,77.218276&radius=500&types=atm&sensor=false&key=your_api_key
private String makeUrl(double latitude, double longitude,String place) {
StringBuilder urlString = new StringBuilder("https://maps.googleapis.com/maps/api/place/search/json?");
if (place.equals("")) {
urlString.append("&location=");
urlString.append(Double.toString(latitude));
urlString.append(",");
urlString.append(Double.toString(longitude));
urlString.append("&radius=1000");
// urlString.append("&types="+place);
urlString.append("&sensor=false&key=" + API_KEY);
} else {
urlString.append("&location=");
urlString.append(Double.toString(latitude));
urlString.append(",");
urlString.append(Double.toString(longitude));
urlString.append("&radius=1000");
urlString.append("&types="+place);
urlString.append("&sensor=false&key=" + API_KEY);
}
return urlString.toString();
}
protected String getJSON(String url) {
return getUrlContents(url);
}
private String getUrlContents(String theUrl)
{
StringBuilder content = new StringBuilder();
try {
URL url = new URL(theUrl);
URLConnection urlConnection = url.openConnection();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()), 8);
String line;
while ((line = bufferedReader.readLine()) != null)
{
content.append(line + "\n");
}
bufferedReader.close();
}
catch (Exception e)
{
e.printStackTrace();
}
return content.toString();
}
}
Now create a new Activity where you want to get the list of nearest places.
/**
*
*/
package com.android.code.GoogleMap.NearsetLandmark;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.List;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.drawable.Drawable;
import android.location.Address;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
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.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import com.android.code.R;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
/**
* #author dwivedi ji *
* */
public class CheckInActivity extends ListActivity {
private String[] placeName;
private String[] imageUrl;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
new GetPlaces(this,getListView()).execute();
}
class GetPlaces extends AsyncTask<Void, Void, Void>{
Context context;
private ListView listView;
private ProgressDialog bar;
public GetPlaces(Context context, ListView listView) {
// TODO Auto-generated constructor stub
this.context = context;
this.listView = listView;
}
#Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
bar.dismiss();
this.listView.setAdapter(new ArrayAdapter<String>(context, android.R.layout.simple_list_item_1, placeName));
}
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
bar = new ProgressDialog(context);
bar.setIndeterminate(true);
bar.setTitle("Loading");
bar.show();
}
#Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
findNearLocation();
return null;
}
}
public void findNearLocation() {
PlacesService service = new PlacesService("past your key");
/*
Hear you should call the method find nearst place near to central park new delhi then we pass the lat and lang of central park. hear you can be pass you current location lat and lang.The third argument is used to set the specific place if you pass the atm the it will return the list of nearest atm list. if you want to get the every thing then you should be pass "" only
*/
List<Place> findPlaces = service.findPlaces(28.632808,77.218276,"atm");
// Hear third argument, we pass the atm for getting atm , if you pass the hospital then this method return list of hospital , If you pass nothing then it will return all landmark
placeName = new String[findPlaces.size()];
imageUrl = new String[findPlaces.size()];
for (int i = 0; i < findPlaces.size(); i++) {
Place placeDetail = findPlaces.get(i);
placeDetail.getIcon();
System.out.println( placeDetail.getName());
placeName[i] =placeDetail.getName();
imageUrl[i] =placeDetail.getIcon();
}
}
}