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Getting data from webservice android studio

I am working on an android application. In this application, I have to retrieve data from a web service and put it in a listview, but it is not retrieving anything. I don't know what I am doing wrong here. Maybe someone can help me with this.
Webservice: http://10.247.240.53/kas/lampen.php
Mainactivity:
`
public class MainActivity extends AppCompatActivity {
ListView listView;
ArrayAdapter<String> adapter;
String[] data;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = findViewById(R.id.listview);
StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder().permitNetwork().build());
getData();
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(MainActivity.this, Showdata.class);
intent.putExtra("teeltbed", listView.getItemAtPosition(position).toString());
startActivity(intent);
}
});
}
private void getData()
{
String getData = null;
String dbResult = "empty";
dbConnect database = new dbConnect(this);
try{
String query = "SELECT * FROM Lamp";
getData = "?query=" + URLEncoder.encode(query, "UTF-8");
String link = "http://10.247.240.53/kas/lampen.php";
dbResult = database.execute(link).get();
}
catch (Exception e){
}
try{
JSONArray ja = new JSONArray(dbResult);
JSONObject jo = null;
data = new String[ja.length()];
for (int i = 0; i < ja.length(); i++)
{
jo = ja.getJSONObject(i);
data[i] = jo.getString("teeltbed");
}
adapter = new ArrayAdapter<String>(this, R.layout.layout_list, R.id.list_item, data);
listView.setAdapter(adapter);
}
catch (Exception e)
{
e.printStackTrace();
}
}
}`

Data is not showing in spinner using volley -Real Device Issue

The code is working fine when testing in emulator-Android 7.1, API 25 but when I test same code in Real Device-Android 4.4.4, API 19 spinner is not showing. And there is no error message even
Config.java
public class Config {
public static String mLocation ="http://towncitycards.com/webservice_action.php?action=";
//http://towncitycards.com/webservice_action.php?action=filter_location
public static final String DATA_URL = mLocation+"filter_location";
//Tags used in the JSON String
public static final String TAG_USERNAME = "name";
public static final String TAG_NAME = "slug";
public static final String TAG_COURSE = "name";
public static final String TAG_SESSION = "slug";
//JSON array name
public static final String JSON_ARRAY = "location";
}
DemoSpinner.java
public class DemoSpinner extends AppCompatActivity implements Spinner.OnItemSelectedListener{
//Declaring an Spinner
private Spinner spinner;
//An ArrayList for Spinner Items
private ArrayList<String> students;
//JSON Array
private JSONArray result;
//TextViews to display details
private TextView textViewName;
private TextView textViewCourse;
private TextView textViewSession;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.demo);
//Initializing the ArrayList
students = new ArrayList<String>();
//Initializing Spinner
spinner = (Spinner) findViewById(R.id.spinner);
//Adding an Item Selected Listener to our Spinner
//As we have implemented the class Spinner.OnItemSelectedListener to this class iteself we are passing this to setOnItemSelectedListener
spinner.setOnItemSelectedListener(this);
//Initializing TextViews
textViewName = (TextView) findViewById(R.id.textViewName);
textViewCourse = (TextView) findViewById(R.id.textViewCourse);
textViewSession = (TextView) findViewById(R.id.textViewSession);
//This method will fetch the data from the URL
getData();
}
private void getData(){
//Creating a string request
StringRequest stringRequest = new StringRequest(Config.DATA_URL,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
JSONObject j = null;
try {
//Parsing the fetched Json String to JSON Object
j = new JSONObject(response);
//Storing the Array of JSON String to our JSON Array
result = j.getJSONArray(Config.JSON_ARRAY);
//Calling method getStudents to get the students from the JSON Array
getStudents(result);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
//Creating a request queue
RequestQueue requestQueue = Volley.newRequestQueue(this);
//Adding request to the queue
requestQueue.add(stringRequest);
}
private void getStudents(JSONArray j){
//Traversing through all the items in the json array
for(int i=0;i<j.length();i++){
try {
//Getting json object
JSONObject json = j.getJSONObject(i);
//Adding the name of the student to array list
students.add(json.getString(Config.TAG_USERNAME));
} catch (JSONException e) {
e.printStackTrace();
}
}
//Setting adapter to show the items in the spinner
spinner.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, students));
}
//Method to get student name of a particular position
private String getName(int position){
String name="";
try {
//Getting object of given index
JSONObject json = result.getJSONObject(position);
//Fetching name from that object
name = json.getString(Config.TAG_NAME);
} catch (JSONException e) {
e.printStackTrace();
}
//Returning the name
return name;
}
//Doing the same with this method as we did with getName()
private String getCourse(int position){
String course="";
try {
JSONObject json = result.getJSONObject(position);
course = json.getString(Config.TAG_COURSE);
} catch (JSONException e) {
e.printStackTrace();
}
return course;
}
//Doing the same with this method as we did with getName()
private String getSession(int position){
String session="";
try {
JSONObject json = result.getJSONObject(position);
session = json.getString(Config.TAG_SESSION);
} catch (JSONException e) {
e.printStackTrace();
}
return session;
}
//this method will execute when we pic an item from the spinner
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
//Setting the values to textviews for a selected item
textViewName.setText(getName(position));
textViewCourse.setText(getCourse(position));
textViewSession.setText(getSession(position));
}
//When no item is selected this method would execute
#Override
public void onNothingSelected(AdapterView<?> parent) {
textViewName.setText("");
textViewCourse.setText("");
textViewSession.setText("");
}
}

Please use this edited code this will work for you:
public class DemoSpinner extends AppCompatActivity implements Spinner.OnItemSelectedListener{
//Declaring an Spinner
private Spinner spinner;
//An ArrayList for Spinner Items
private ArrayList<String> students;
//JSON Array
private JSONArray result;
//TextViews to display details
private TextView textViewName;
private TextView textViewCourse;
private TextView textViewSession;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.demo);
//Initializing the ArrayList
students = new ArrayList<String>();
//Initializing Spinner
spinner = (Spinner) findViewById(R.id.spinner);
//Adding an Item Selected Listener to our Spinner
//As we have implemented the class Spinner.OnItemSelectedListener to this class iteself we are passing this to setOnItemSelectedListener
spinner.setOnItemSelectedListener(this);
//Initializing TextViews
textViewName = (TextView) findViewById(R.id.textViewName);
textViewCourse = (TextView) findViewById(R.id.textViewCourse);
textViewSession = (TextView) findViewById(R.id.textViewSession);
//This method will fetch the data from the URL
getData();
}
private void getData(){
//Creating a request queue
JsonObjectRequest StringRequest = new JsonObjectRequest(Request.Method.GET, Config.DATA_URL, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
if (response != null) {
JSONObject j = null;
try {
//Parsing the fetched Json String to JSON Object
j = response;
//Storing the Array of JSON String to our JSON Array
result = j.getJSONArray(Config.JSON_ARRAY);
//Calling method getStudents to get the students from the JSON Array
getStudents(result);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
System.out.println("Volly error is this >>" + error);
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(StringRequest);
}
private void getStudents(JSONArray j){
//Traversing through all the items in the json array
for(int i=0;i<j.length();i++){
try {
//Getting json object
JSONObject json = j.getJSONObject(i);
//Adding the name of the student to array list
students.add(json.getString(Config.TAG_USERNAME));
} catch (JSONException e) {
e.printStackTrace();
}
}
Log.e("student >>",students.toString());
//Setting adapter to show the items in the spinner
spinner.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, students));
}
//Method to get student name of a particular position
private String getName(int position){
String name="";
try {
//Getting object of given index
JSONObject json = result.getJSONObject(position);
//Fetching name from that object
name = json.getString(Config.TAG_NAME);
} catch (JSONException e) {
e.printStackTrace();
}
//Returning the name
return name;
}
//Doing the same with this method as we did with getName()
private String getCourse(int position){
String course="";
try {
JSONObject json = result.getJSONObject(position);
course = json.getString(Config.TAG_COURSE);
} catch (JSONException e) {
e.printStackTrace();
}
return course;
}
//Doing the same with this method as we did with getName()
private String getSession(int position){
String session="";
try {
JSONObject json = result.getJSONObject(position);
session = json.getString(Config.TAG_SESSION);
} catch (JSONException e) {
e.printStackTrace();
}
return session;
}
//this method will execute when we pic an item from the spinner
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
//Setting the values to textviews for a selected item
textViewName.setText(getName(position));
textViewCourse.setText(getCourse(position));
textViewSession.setText(getSession(position));
}
//When no item is selected this method would execute
#Override
public void onNothingSelected(AdapterView<?> parent) {
textViewName.setText("");
textViewCourse.setText("");
textViewSession.setText("");
}
}

StringRequest stringRequest = new StringRequest(Request. Method.GET,Config.DATA_URL, new Response.Listener()
Use it in getData(). Because you wasn't specified Request.Method.GET
::OR::
You can use same like this:
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
}) {
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
params.put("action", "filter_location");
return params;
}
};
Then remove the parameter "action=filter_location" from url.

Populate Android spinner from PHP MySql

I have populate spinner from PHP MySql.While i select 1st item then populate another spinner from item click.But the problem is in second spinner populate the data doubly.Whenever i select the item of 1st Spinner.Can someone help me for only once add the data in Second spinner.
Here is my Screen Shot
Here is my Activity Code
spinnerCategory.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View arg1,
int pos, long arg3) {
// TODO Auto-generated method stub
Toast.makeText(parent.getContext(), "On Item Select : \n" + parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
strSelected_Category=parent.getItemAtPosition(pos).toString();
System.out.println("strSelected_Category = " + strSelected_Category);
spinnerSubCategory.setEnabled(true);
ServiceHandler jsonParser = new ServiceHandler();
String json = jsonParser.makeServiceCall(URL_SUB_CATEGORIES, ServiceHandler.GET);
Log.e("Response: ", " > " + json);
if (json != null)
{
try {
JSONArray array=new JSONArray(json);
JSONArray sortedArray = new JSONArray();
for(int i=0;i<array.length();i++)
{
JSONObject obj=array.getJSONObject(i);
if(obj.getString("cat_name").equalsIgnoreCase(strSelected_Category))
{
sortedArray.put(obj);
Log.e("sortedArray"," = " +sortedArray);
}
}
if (sortedArray != null)
{
for (int i = 0; i < sortedArray.length(); i++)
{
JSONObject catObj = (JSONObject) sortedArray.get(i);
Category cat = new Category(catObj.getInt("subcat_id"),catObj.getString("subcat_name"));
sub_categoriesList.add(cat);
Log.e("cat "," = " + cat);
}
populateSubCategory();
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else
{
Log.e("JSON Data", "Didn't receive any data from server!");
}
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
/**
* Adding Category spinner data
* */
private void populateSpinner() {
List<String> lables = new ArrayList<String>();
for (int i = 0; i < categoriesList.size(); i++)
{
lables.add(categoriesList.get(i).getName());
}
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, lables);
spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerCategory.setAdapter(spinnerAdapter);
}
private void populateSubCategory() {
List<String> lables = new ArrayList<String>();
for (int i = 0; i < sub_categoriesList.size(); i++)
{
lables.add(sub_categoriesList.get(i).getName());
}
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, lables);
spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerSubCategory.setAdapter(spinnerAdapter);
}

spinnerCategory.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View arg1,
int pos, long arg3) {
// TODO Auto-generated method stub
Toast.makeText(parent.getContext(), "On Item Select : \n" + parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
strSelected_Category=parent.getItemAtPosition(pos).toString();
System.out.println("strSelected_Category = " + strSelected_Category);
spinnerSubCategory.setEnabled(true);
ServiceHandler jsonParser = new ServiceHandler();
String json = jsonParser.makeServiceCall(URL_SUB_CATEGORIES, ServiceHandler.GET);
Log.e("Response: ", " > " + json);
if (json != null)
{
try {
JSONArray array=new JSONArray(json);
JSONArray sortedArray = new JSONArray();
for(int i=0;i<array.length();i++)
{
JSONObject obj=array.getJSONObject(i);
if(obj.getString("cat_name").equalsIgnoreCase(strSelected_Category))
{
sortedArray.put(obj);
Log.e("sortedArray"," = " +sortedArray);
}
}
sub_categoriesList.clear();
if (sortedArray != null)
{
for (int i = 0; i < sortedArray.length(); i++)
{
JSONObject catObj = (JSONObject) sortedArray.get(i);
Category cat = new Category(catObj.getInt("subcat_id"),catObj.getString("subcat_name"));
sub_categoriesList.add(cat);
Log.e("cat "," = " + cat);
}
populateSubCategory();
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else
{
Log.e("JSON Data", "Didn't receive any data from server!");
}
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
/**
* Adding Category spinner data
* */
private void populateSpinner() {
List<String> lables = new ArrayList<String>();
for (int i = 0; i < categoriesList.size(); i++)
{
lables.add(categoriesList.get(i).getName());
}
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, lables);
spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerCategory.setAdapter(spinnerAdapter);
}
private void populateSubCategory() {
List<String> lables = new ArrayList<String>();
for (int i = 0; i < sub_categoriesList.size(); i++)
{
lables.add(sub_categoriesList.get(i).getName());
}
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, lables);
spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerSubCategory.setAdapter(spinnerAdapter);
}
TRY THIS , HAPPY CODING :)

Matching json parsed value with user entered value

I parsed json to adapt for my autocompleteTextView. I tried to match the value parsed by my json object with the value entered by user.
But some where i am failing. please help me in matching these values.
i have to match the string(acity) that is entered by user with my parsed json value stored in responseList.
This is how i am trying.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
new HttpGetTask().execute();
Button shwBtn = (Button) findViewById(R.id.showBtn);
shwBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
AutoCompleteTextView city1 = (AutoCompleteTextView) findViewById(R.id.autoCity);
EditText area1 = (EditText) findViewById(R.id.edArea);
String aCity = city1.getText().toString().trim();
String aArea = area1.getText().toString().trim();
//here i have to match acity with all the values in responseList before sending it to next activity
Intent myInt = new Intent(getBaseContext(),
Map1Activity.class);
String city = city1.getText().toString();
String area = area1.getText().toString();
myInt.putExtra("city", city);
myInt.putExtra("area", area);
startActivity(myInt);
}
});
}
private class HttpGetTask extends AsyncTask<Void, Void, String> {
String URL = "xyzz.cities.json?app_id=test";
AndroidHttpClient mClient = AndroidHttpClient.newInstance("");
#Override
protected String doInBackground(Void... params) {
// http stuff
return null;
}
#Override
protected void onPostExecute(String result) {
try {
JSONArray json = new JSONArray(result);
//getting my response(cities)
Log.v("ResponseCity", result);
final List<String> responseList = new ArrayList<String>();
for (int i = 0; i < json.length(); i++) {
final JSONObject e = json.getJSONObject(i);
String name = e.getString("name");
//Adding all values to a stringList
responseList.add(name);
ArrayAdapter<String> adapter;
adapter = new ArrayAdapter<String>(SearchActivity.this,
android.R.layout.simple_dropdown_item_1line,
responseList);
AutoCompleteTextView textView = (AutoCompleteTextView) findViewById(R.id.autoCity);
textView.setAdapter(adapter);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (null != mClient)
mClient.close();
}
}

So lets assume you need to match a certain city before you intent to a map :
private final List<String> responseList;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
new HttpGetTask().execute();
Button shwBtn = (Button) findViewById(R.id.showBtn);
shwBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
AutoCompleteTextView city1 = (AutoCompleteTextView) findViewById(R.id.autoCity);
EditText area1 = (EditText) findViewById(R.id.edArea);
String aCity = city1.getText().toString().trim();
String aArea = area1.getText().toString().trim();
//here i have to match acity with all the values in responseList before sending it to next activity
for(int i=0; i<responseList.size(); i++) {
if(responseList.get(i).equals(aCity)) {
Intent myInt = new Intent(getBaseContext(),
Map1Activity.class);
String city = city1.getText().toString();
String area = area1.getText().toString();
myInt.putExtra("city", city);
myInt.putExtra("area", area);
startActivity(myInt);
}
}
}
});
}
private class HttpGetTask extends AsyncTask<Void, Void, String> {
String URL = "xyzz.cities.json?app_id=test";
AndroidHttpClient mClient = AndroidHttpClient.newInstance("");
#Override
protected String doInBackground(Void... params) {
// http stuff
return null;
}
#Override
protected void onPostExecute(String result) {
try {
JSONArray json = new JSONArray(result);
//getting my response(cities)
Log.v("ResponseCity", result);
responseList = new ArrayList<String>();
for (int i = 0; i < json.length(); i++) {
final JSONObject e = json.getJSONObject(i);
String name = e.getString("name");
//Adding all values to a stringList
responseList.add(name);
ArrayAdapter<String> adapter;
adapter = new ArrayAdapter<String>(SearchActivity.this,
android.R.layout.simple_dropdown_item_1line,
responseList);
AutoCompleteTextView textView = (AutoCompleteTextView) findViewById(R.id.autoCity);
textView.setAdapter(adapter);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (null != mClient)
mClient.close();
}
}
It should be something like that if I didnt guess your intent wrongly.

How to handle items inside onListItemClick of ArrayListAdapter?

I want to create a list view with names. Clicking on each name will give me different grade.
All names and grades ara taken by a database and stored into json format which is passed through activities with intents:
public class StudentList extends ListActivity {
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
/**get the intent*/
Intent studentIntent = getIntent();
/**retrieve the string extra passed*/
ArrayList<String> nameRecd = studentIntent.getStringArrayListExtra("name");
ArrayList<String> gradeRecd = studentIntent.getStringArrayListExtra("grade");
try {
JSONArray jsonData = new JSONArray(getIntent().getStringExtra("data"));
Log.i("json review:", "Check out my JSON, looks like his JMother");
ArrayAdapter<String> adapter = new ArrayAdapter<String>
(this, android.R.layout.simple_list_item_1, nameRecd);
setListAdapter(adapter);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
#Override
protected void onListItemClick(ListView l, View v, int position, long id) {
String item = (String) getListAdapter().getItem(position);
int pos = position;
Toast.makeText(this, item + " selected" + "Grade:" , Toast.LENGTH_LONG).show();
}
}
So I want for every selected name to be able to toast or handle otherwise tha grade of the same position so I can build some kind of profile for the specific student and be able to access it by clicking on students name!

Problem solved starting the sameintent inside onListItemClick...
#Override
protected void onListItemClick(ListView l, View v, int position, long id) {
String item = (String) getListAdapter().getItem(position);
/**get the intent*/
Intent studentIntent = getIntent();
/**retrieve the data extra passed*/
ArrayList<String> names = new ArrayList<String>();
ArrayList<String> grades = new ArrayList<String>();
JSONObject json_data = new JSONObject();
try {
JSONArray jARR = new JSONArray(getIntent().getStringExtra("data"));
Log.i("json review:", "Check out my JSON, looks like his JMother");
for(int i=0;i<jARR.length();i++){
json_data = jARR.getJSONObject(i);
names.add((json_data.getString("name"))) ;
grades.add((json_data.getString("grade"))) ;
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}