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How to pass a post value to server and store the result in the listview android

this is my listview where data is coming from the remote server in the JSON format so everything is working fine but now I have to pass a certain value to the server and then make a filter based on that value and then load only the desired result into the listview
public class Reciepe extends AppCompatActivity {
String Barname;
TextView food,price;
private ListView reciepeListView;
private ProgressDialog loading;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_reciepe);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
toolbar.setBackgroundColor(Color.parseColor("#FFBC03"));
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
new JSONTask().execute("http://thehostels.in/Foody/reciepe_json.php");
DisplayImageOptions options = new DisplayImageOptions.Builder()
.cacheInMemory(true)
.cacheOnDisk(true)
.build();
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(Reciepe.this)
.defaultDisplayImageOptions(options)
.build();
com.nostra13.universalimageloader.core.ImageLoader.getInstance().init(config);
reciepeListView = (ListView)findViewById(R.id.list_recipe);
Intent intent=getIntent();
if(intent!=null){
Barname=intent.getStringExtra("Type");
Log.e("Type",Barname);
}
if (Barname != null) {
switch (Barname) {
case "Punjabi":
getSupportActionBar().setTitle("Punjabi");
break;
case "Chinese":
getSupportActionBar().setTitle("Chinese");
break;
case "South Indian":
getSupportActionBar().setTitle("South Indian");
break;
case "Gujarati":
getSupportActionBar().setTitle("Gujarati");
break;
case "Chicken":
getSupportActionBar().setTitle("Chicken");
break;
}
}
}
public class JSONTask extends AsyncTask<String, String, List<Listview_reciepe_conveyer>> {
ProgressDialog loading;
#Override
protected void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(Reciepe.this, "loading,please wait...", null, true, true);
}
#Override
protected List<Listview_reciepe_conveyer> doInBackground(String... params) {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL url = new URL(params[0]);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
String finalJson = buffer.toString();
JSONObject parentObject = new JSONObject(finalJson);
JSONArray parentArray = parentObject.getJSONArray("list");
List<Listview_reciepe_conveyer> fixture_conveyerList = new ArrayList<Listview_reciepe_conveyer>();
for (int i = 0; i < parentArray.length(); i++) {
JSONObject finalObject = parentArray.getJSONObject(i);
Listview_reciepe_conveyer fixtureList = new Listview_reciepe_conveyer();
fixtureList.setImage(finalObject.getString("image"));
fixtureList.setFood(finalObject.getString("food"));
fixtureList.setPrice(finalObject.getString("price"));
fixture_conveyerList.add(fixtureList);
}
return fixture_conveyerList;
}catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
#Override
protected void onPostExecute(List<Listview_reciepe_conveyer> result) {
super.onPostExecute(result);
if (result !=null) {
loading.dismiss();
ListAdapter adapter = new ListAdapter(Reciepe.this, R.layout.custom_recipe_list, result);
reciepeListView.setAdapter(adapter);
}
else
{
Toast.makeText(Reciepe.this, "No Internet Connection!", Toast.LENGTH_LONG).show();
loading.dismiss();
}
}
}
public class ListAdapter extends ArrayAdapter {
private List<Listview_reciepe_conveyer> reciepe_conveyerList;
private int resource;
private LayoutInflater inflater;
public ListAdapter(Context context, int resource, List<Listview_reciepe_conveyer> objects) {
super(context, resource, objects);
reciepe_conveyerList = objects;
this.resource = resource;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = inflater.inflate(resource, null);
}
ImageView food_photo;
final TextView food,price;
food_photo = (ImageView)convertView.findViewById(R.id.food_photo);
food = (TextView)convertView.findViewById(R.id.food_name);
price = (TextView)convertView.findViewById(R.id.food_price);
ImageLoader.getInstance().displayImage(reciepe_conveyerList.get(position).getImage(), food_photo);
food.setText(reciepe_conveyerList.get(position).getFood());
String newprice= ("Rs."+reciepe_conveyerList.get(position).getPrice());
price.setText(newprice);
reciepeListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent i=new Intent(Reciepe.this,Description.class);
i.putExtra("Dish",reciepe_conveyerList.get(position).getFood());
i.putExtra("Price",reciepe_conveyerList.get(position).getPrice());
startActivity(i);
}
}
);
return convertView;
}
}
}
this is what my code looks like where i am loading a list from an api,
so i am using AsyncTask to load the listview but i do not know how to make the post request , i have updated the api it os taking the post values but what changes do i need to make on android level.., i have to pass the 'barname' as the post parameter...

On:
protected List<Listview_reciepe_conveyer> doInBackground(String... params) {
Try:
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
conn.setReadTimeout(10000);
conn.setConnectTimeout(15000);
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>();
params.add(new BasicNameValuePair("firstParam", "paremeterValue"));
//your param nr.1.
//This is the value that you want to send.
//It is represented like 'name=value', or in your case 'firstParam=parameterValue'.
//You need to edit this field in respect to what you are doing.
params.add(new BasicNameValuePair("secondParam", "your2parameter"));
//your param nr.2
//This is the value that you want to send.
//It is represented like 'name=value', or in your case 'secondParam=your2parameter'.
//You need to edit this field in respect to what you are doing.
params.add(new BasicNameValuePair("thirdParam", "anotherParameter"));
//your param nr.3
//This is the value that you want to send.
//It is represented like 'name=value', or in your case 'thirdParam=anotherParameter'.
//You need to edit this field in respect to what you are doing.
// Write(add) parameters to your request
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(os, "UTF-8"));
writer.write(getQuery(params));
writer.flush();
writer.close();
os.close();
conn.connect();
Before your..:
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
...
EDITED
private String getQuery(List<BasicNameValuePair> params) throws UnsupportedEncodingException
{
StringBuilder result = new StringBuilder();
boolean first = true;
for (String pair : params)
{
if (first)
first = false;
else
result.append("&");
result.append(URLEncoder.encode(pair.getName(), "UTF-8"));
result.append("=");
result.append(URLEncoder.encode(pair.getValue(), "UTF-8"));
}
return result.toString();
}
This function turn's the List params, in a String with the format, 'name=value' which is needed to send via request.
For more info see Query String.
Please do NOT copy and paste the solution, you also need to understand what you are doing and replace variables/methods accordingly, for this code to work.
Best

Why does the HTTP request not work? Wit.ai

I want wit.ai analysing my sentences. When I send the String "where is the door" wit.ai should answer with a JSON which includes that my sentence has the intent : navigation. But unfortunately the wit.ai log says that there is no request going in. What am I doing wrong? The parameters are right, but maybe they are in a false order?
public class MainActivity extends AppCompatActivity {
String addressM = "https://api.wit.ai/message";
String accessToken = "xxxxxxxxxxxxxxxxxxxxccc";
String header = "Authorization: Bearer ";
String query = "q";
String message = "where is the door";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button button = (Button) findViewById(R.id.button);
final TextView textView = (TextView) findViewById(R.id.textView);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
new JSONTask().execute(addressM);
}
});
}
private class JSONTask extends AsyncTask<String, String, String >{
#Override
protected String doInBackground(String... params) {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL url = new URL(params[0]);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestProperty("access_token", "xxxxxxxxxxxxxxxxxxxxxxx");
connection.setRequestProperty("q", message);
connection.setRequestMethod("POST");
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = reader.readLine()) !=null){
buffer.append(line);
}
return buffer.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (connection != null){
connection.disconnect();
}
try {
if (reader != null){
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
TextView textView = (TextView) findViewById(R.id.textView);
textView.setText(result);
Toast.makeText(MainActivity.this, result,
Toast.LENGTH_LONG).show();
}
}
}
Here is a example what the reponse should be. Relevant for me is that the intent is navigation
[
{
"entities":
{
"intent":
[
{
"confidence":
0.92597581019421
"value":
{
"value":
"navigation"
}
"entity":
"intent"
}
]
}
"confidence":
null
"_text":
"where is the door"
"intent":
"default_intent"
"intent_id":
"default_intent_id"
}
]

You should be passing the parameters as query parameters, not as HTTP headers. Also the access token should be passed in an authorization HTTP header.
Try this:
Uri uri = Uri.parse(addressM)
.buildUpon()
.appendQueryParameter("q", message)
.build();
URL url = new URL(uri.toString());
connection = (HttpURLConnection) url.openConnection();
connection.setRequestProperty("Authorization", "Bearer " + myAccessToken);
connection.setRequestMethod("POST");
connection.connect();
If you want to make your life easier using HTTP APIs consider using retrofit (I haven't tried to see if Wit's API is friendly to it), or at the very least try OkHttp.
static final String MESSAGE_BASE_URL = "https://api.wit.ai/message";
static final String MY_ACCESS_TOKEN = "...";
private final OkHttpClient client = new OkHttpClient();
...
HttpUrl url = HttpUrl.parse(MESSAGE_BASE_URL)
.newBuilder()
.addQueryParameter("q", message)
.build();
Request request = new Request.Builder()
.url(url)
.addHeader("authorization", "Bearer " + MY_ACCESS_TOKEN)
.build();
Response response = client.newCall(request).execute();
return response.body().string();

Android App - HttpURLConnection in onCreateView

I just started to learn developing android app, and I need to call an URL to get the JSON response.
Here is my java class :-
public class SpeakersFragment extends Fragment {
List<String> titles;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_speakers, container, false);
initData();
RecyclerView rv = (RecyclerView)view.findViewById(R.id.info_speaker_recycler);
rv.setHasFixedSize(true);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
rv.setLayoutManager(llm);
RecyclerAdapter adapter = new RecyclerAdapter(getActivity(), titles);
rv.setAdapter(adapter);
new GetSpeakersList().execute(URL);
return view;
}
public class GetSpeakersList extends AsyncTask<String , Void ,String> {
String server_response;
#Override
protected String doInBackground(String... strings) {
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(strings[0]);
urlConnection = (HttpURLConnection) url.openConnection();
int responseCode = urlConnection.getResponseCode();
if(responseCode == HttpURLConnection.HTTP_OK){
server_response = readStream(urlConnection.getInputStream());
Log.v("CatalogClient", server_response);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Log.e("Response", "" + server_response);
}
}
private String readStream(InputStream in) {
BufferedReader reader = null;
StringBuffer response = new StringBuffer();
try {
reader = new BufferedReader(new InputStreamReader(in));
String line = "";
while ((line = reader.readLine()) != null) {
response.append(line);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return response.toString();
}
When I checked the logs, the response is not there at all. I tried creating a new project, it works fine if I call the GetSpeakersList in onCreate() instead of onCreateView.
Can guide me how to get this to work? Thanks!

Using an AsyncTask can be quite cumbersome to use for constant Network requests: Try using a popular, well-supported library for networking: Here are two popular ones:
1) Retrofit
OR
2) Volley

this is how i ask for data hope you can use it to your means
urlConnection = new URL("www.example.com");
connection = (HttpURLConnection) urlConnection.openConnection();
connection.setDoOutput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-type","application/json;charset=UTF-8");
connection.setReadTimeout(60000);
connection.setConnectTimeout(60000);
connection.connect();
dataOutputStream = new
DataOutputStream(connection.getOutputStream());
Log.d("OUTPUT :",param);
dataOutputStream.writeBytes(param);
dataOutputStream.flush();
dataOutputStream.close();
//incoming data
InputStream in = new BufferedInputStream(connection.getInputStream());
BufferedReader reader = new BufferedReader(new
InputStreamReader(in));
result = new StringBuilder(16384);
String line;
while ((line = reader.readLine()) != null)
{
result.append(line);
}
Log.d("INPUT :",result.toString());

Android app can not connect to localhost server

I've created Database in my localhost, and want parse data from it with android app.I Create server with NodeJS and it works i can see the Database in browser, but my android app can't connect with this localhost server.
Here is my Java code.
public class MainActivity extends AppCompatActivity {
protected TextView tvData;
public static ArrayList<String> titleList = new ArrayList<String>();
private static ArrayAdapter<String> adapter;
private static ListView lv;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvData = (TextView)findViewById(R.id.tvJsonItem);
// adapter = new ArrayAdapter<String>(this, R.layout.list_item, R.id.listView1, titleList);
// lv = (ListView) findViewById(R.id.listView1);
new JSONTask().execute("http://10.0.2.2:3000/api/people");
}
public class JSONTask extends AsyncTask<String,String,String>{
#Override
protected String doInBackground(String... params) {
HttpURLConnection connection = null;
BufferedReader reader = null;
int statusCode = 0;
try {
URL url = new URL(params[0]);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestProperty("Content-Type", "application/json");
connection.setRequestMethod("GET");
connection.connect(); //connect to server
statusCode = connection.getResponseCode();
if (statusCode == 200) {
System.out.println("Server responded with code: " + statusCode);
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
String finalJSON = buffer.toString();
JSONObject parentObject = new JSONObject(finalJSON);
JSONArray parentArray = parentObject.getJSONArray("people");
StringBuffer finalBufferdData = new StringBuffer();
for (int i = 0; i < parentArray.length(); i++) {
JSONObject finalObj = parentArray.getJSONObject(i);
String peopleName = finalObj.getString("name");
Integer age = finalObj.getInt("age");
finalBufferdData.append(peopleName + "-->" + age + "\n");
Log.i("Hakob_log",peopleName + "-->" + age + "\n");
}
return finalBufferdData.toString(); //pases result to POstExecute
}else{
Log.i("Hakob_log","Error");
}
}catch(MalformedURLException e){
e.printStackTrace();
}catch(IOException e){
e.printStackTrace();
}catch(JSONException e){
e.printStackTrace();
}
finally {
if(connection !=null) {
connection.disconnect();
}
try {
if(reader !=null) {
reader.close();
}
}catch(IOException e){
e.printStackTrace();
}
}
return null;
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
tvData.setText(result);
}
}
}
I thnk something wrong with this line
new JSONTask().execute("http://localhost:3000/api/people");
Thanks

Use the IP-address of the computer that you are referring to as localhost instead, this should solve your problem e.g.:
new JSONTask().execute("http://10.0.0.100:3000/api/people");

How to start an Activity from AsyncTask?

I've build an AsyncTask and want to start another Activity when it ends (onPostExecute) but it won't work and I can't find the problem. Maybe there is a problem with String, String, String ?
Here is my code:
public class StartSearch extends AsyncTask<String, String, String> {
private Activity activity;
#Override
protected String doInBackground(String... strings) {
StringBuilder sb = new StringBuilder();
String http = "https://list-creater-service.herokuapp.com/api/v1/search";
HttpURLConnection urlConnection = null;
JSONObject json = null;
HttpResponse response = null;
try {
//connect to server
URL url = new URL(http);
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setDoOutput(true);
urlConnection.setRequestMethod("POST");
urlConnection.setUseCaches(false);
urlConnection.setConnectTimeout(10000);
urlConnection.setReadTimeout(10000);
urlConnection.setRequestProperty("Content-Type","application/json");
urlConnection.setRequestProperty("Host", "list-creater-service.herokuapp.com");
urlConnection.connect();
//Create JSONObject here
JSONObject jsonParam = new JSONObject();
jsonParam.put("gamemode", gametype);
jsonParam.put("country", selCountry);
jsonParam.put("min_size", minSize);
jsonParam.put("max_size", maxSize);
OutputStreamWriter out = new OutputStreamWriter(urlConnection.getOutputStream());
out.write(jsonParam.toString());
out.close();
int HttpResult = urlConnection.getResponseCode();
if(HttpResult == HttpURLConnection.HTTP_OK){
BufferedReader br = new BufferedReader(new InputStreamReader(
urlConnection.getInputStream(),"utf-8"));
String line;
while ((line = br.readLine()) != null) {
sb.append(line);
}
br.close();
String jsonS = sb.toString();
JSONArray jsonArray = new JSONArray(jsonS);
int length = jsonArray.length();
String[] names = new String[length];
for (int i = 0; i < length; i++) {
JSONObject jsonObject = new JSONObject(jsonArray.get(i).toString());
ArrayList serverList = new ArrayList();
serverList.add(jsonObject.getString("name"));
serverData = getSharedPreferences(filename, 0);
SharedPreferences.Editor editor = serverData.edit();
Set<String> set = new HashSet<String>();
set.addAll(serverList);
editor.putStringSet("name", set);
editor.commit();
System.out.println(jsonObject.getString("name"));
names[i] = jsonObject.getString("name");
}
//String name = jsonObject.getString("name");
System.out.println("" + sb.toString());
}else{
System.out.println(urlConnection.getResponseMessage());
}
} catch (MalformedURLException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
//TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(urlConnection!=null)
urlConnection.disconnect();
}
return null;
}
#Override
protected void onPostExecute(String result) {
activity.startActivity(new Intent(activity, ServerIndex.class));
}
}
Need some help!
Thx :)

You have Activity activity declared , but you have not assigned your current activity context to it . Assign the current activity context to it.
Like
activity=currentContext;

You should use runOnUIThread in your onPostExecute
runOnUiThread(new Runnable() {
public void run() {
activity.startActivity(new Intent(activity, ServerIndex.class));
}});
And as Raghunandan said, activity is not initialized. You can access the startActivity method from your StartSearch class by using
SomeActivity.this.startActivity (SomeActivity has to be initialized)
And since onPostExecute runs on the UI thread, you may or may not call runOnUIThread.