Develop Reference

ListView doesn't refresh with notifydatasetchanged

I have a MySQL database of two columns displayed in an android ListView. I use Retrofit 1.9 to get the data from MySQL. The adapter for the ListView is a BaseAdapter and I don't have a DatabaseHelperclass. When I add a data in the ListView from my mobile phone, it doesn't refresh the ListView. I have to close and restart the app. I try to refresh with listViewAdapter.notifyDataSetChanged();.
This is the fragment where the listview is:
public class rightFragment extends Fragment {
String BASE_URL = "http://awebsite.com";
View view;
ListView listView;
ListViewAdapter listViewAdapter;
Button buttondisplay;
Button buttonadd;
EditText new_id;
EditText newWordFra;
EditText newWordDeu;
ArrayList<String> id = new ArrayList<>();
ArrayList<String> fra = new ArrayList<>();
ArrayList<String> deu = new ArrayList<>();
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(com.example.geeko.Deu.R.layout.fragment_right, container, false);
listView = (ListView) view.findViewById(com.example.geeko.Deu.R.id.listView); //<<<< ADDED NOTE use your id
listViewAdapter = new ListViewAdapter(getActivity(), id, fra, deu);
displayData();
buttondisplay = (Button) view.findViewById(com.example.geeko.Deu.R.id.buttondisplay);
buttonadd = (Button) view.findViewById(com.example.geeko.Deu.R.id.buttonadd);
buttondelete = (Button) view.findViewById(com.example.geeko.Deu.R.id.newID);
newWordFra = (EditText) view.findViewById(com.example.geeko.Deu.R.id.newWordFra);
newWordDeu = (EditText) view.findViewById(com.example.geeko.Deu.R.id.newWordDeu);
buttonadd.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Toast.makeText(MainActivity.this , "button add", Toast.LENGTH_LONG).show();
insert_data();
listViewAdapter.notifyDataSetChanged();
}
});
buttondisplay.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (buttondisplay.getText().toString().contains("Show")) {
listView.setAdapter(listViewAdapter);
buttondisplay.setText("Hide");
} else {
listView.setAdapter(null);
buttondisplay.setText("Show");
}
}
});
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long ids) {
new_id.setText(id.get(position));
newWordFra.setText(fra.get(position));
newWordDeu.setText(deu.get(position));
}
});
return view;
}
public void insert_data() {
RestAdapter adapter = new RestAdapter.Builder()
.setEndpoint(BASE_URL) //Setting the Root URL
.build();
AppConfig.insert api = adapter.create(AppConfig.insert.class);
api.insertData(
newWordFra.getText().toString(),
newWordDeu.getText().toString(),
new Callback<Response>() {
#Override
public void success(Response result, Response response) {
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(result.getBody().in()));
String resp;
resp = reader.readLine();
Log.d("success", "" + resp);
JSONObject jObj = new JSONObject(resp);
int success = jObj.getInt("success");
if(success == 1){
Toast.makeText(getActivity(), "Successfully inserted", Toast.LENGTH_SHORT).show();
} else{
Toast.makeText(getActivity(), "Insertion Failed", Toast.LENGTH_SHORT).show();
}
} catch (IOException e) {
Log.d("Exception", e.toString());
} catch (JSONException e) {
Log.d("JsonException", e.toString());
}
}
#Override
public void failure(RetrofitError error) {
Toast.makeText(getActivity(), error.toString(), Toast.LENGTH_LONG).show();
}
}
);
}
public void displayData() {
RestAdapter adapter = new RestAdapter.Builder()
.setEndpoint(BASE_URL) //Setting the Root URL
.build();
AppConfig.read api = adapter.create(AppConfig.read.class);
api.readData(new Callback<JsonElement>() {
#Override
public void success(JsonElement result, Response response) {
String myResponse = result.toString();
Log.d("response", "" + myResponse);
try {
JSONObject jObj = new JSONObject(myResponse);
int success = jObj.getInt("success");
if (success == 1) {
JSONArray jsonArray = jObj.getJSONArray("details");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jo = jsonArray.getJSONObject(i);
id.add(jo.getString("id"));
fra.add(jo.getString("fra"));
deu.add(jo.getString("deu"));
}
listView.setAdapter(listViewAdapter);
} else {
Toast.makeText(getActivity(), "No Details Found", Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
Log.d("exception", e.toString());
}
}
#Override
public void failure(RetrofitError error) {
Log.d("Failure", error.toString());
Toast.makeText(getActivity(), error.toString(), Toast.LENGTH_LONG).show();
}
}
);
}
}
This is the listViewAdpater class :
public class ListViewAdapter extends BaseAdapter {
private final Context context;
private ArrayList<String> id = new ArrayList<String>();
private ArrayList<String> fra = new ArrayList<String>();
private ArrayList<String> deu = new ArrayList<String>();
LayoutInflater layoutInflater;
public ListViewAdapter(Context ctx, ArrayList<String> id, ArrayList<String> fra, ArrayList<String> deu) {
this.context = ctx;
this.id = id;
this.fra = fra;
this.deu = deu;
}
#Override
public int getCount() {
return id.size();
}
#Override
public Object getItem(int position) {
return id.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#SuppressLint("ViewHolder")
#Override
public View getView(final int position, View view, ViewGroup parent) {
final Holder holder;
if (view == null) {
layoutInflater = (LayoutInflater) context.getSystemService
(Context.LAYOUT_INFLATER_SERVICE);
view = layoutInflater.inflate(R.layout.list_item, null);
holder = new Holder();
holder.txt_fra = (TextView) view.findViewById(R.id.fra);
holder.txt_deu = (TextView) view.findViewById(R.id.deu);
view.setTag(holder);
} else {
holder = (Holder) view.getTag();
}
holder.txt_fra.setText(fra.get(position));
holder.txt_deu.setText(deu.get(position));
return view;
}
static class Holder {
TextView txt_fra, txt_deu;
}
}
Should I create a method to refresh my ListView?

First of all I would suggest to remove the unnecessary initialization of your variables inside the Adapter:
private ArrayList<String> id = new ArrayList<String>();
private ArrayList<String> fra = new ArrayList<String>();
private ArrayList<String> deu = new ArrayList<String>();
By assigning the pointer from your fragment you will already assign an initialized ArrayList. You want both pointers to point at the same ArrayList Object so changes apply to both.
Apparently, the data stored in the Adapter is not being updated correctly. I would suggest to debug your app - setting the breakpoint so that you can see the data that the Adapter stores after an update.
The idea of writing a method for updates has already been implemented with the notifyDataSetChanged(). Just override the method in your adapter and do eventual changes before calling the super.notifyDataSetChanged().
If you have any success with those changes let us know.

buttonadd.setOnClickListener(new View.OnClickListener() {
...
insert_data();
listViewAdapter.notifyDataSetChanged();
}
});
In your onClickListener, you are calling insert_data(), followed by listViewAdapter.notifyDataSetChanged()
insert_data() method is sending a network request to retrieve the data to populate the list. BUT, you are calling notifyDataSetChanged BEFORE the network request is done. That's why the listView is empty, and will stay empty. You need to wait AFTER the network request and AFTER you have populated your ArrayList with the data to call notifyDataSetChanged.
How do we know the network request is done? Simply at the end of the callback (which you've implemented):
new Callback<Response>() {
#Override
public void success(Response result, Response response) {...
At the end of the success method, you call listViewAdapter.notifyDataSetChanged() method.
Hope that makes sense! Try it and let us know what happens

I've founded a solution. I've added getActivity.recreate(); in the method insert_data.
public void success(Response result, Response response) {
try {
BufferedReader reader = new BufferedReader
(new InputStreamReader(result.getBody().in()));
String resp;
resp = reader.readLine();
Log.d("success", "" + resp);
JSONObject jObj = new JSONObject(resp);
int success = jObj.getInt("success");
if(success == 1){
Toast.makeText(getActivity(), "Successfully inserted",
Toast.LENGTH_SHORT).show();
getActivity().recreate();
} else{
Toast.makeText(getActivity(), "Insertion Failed",
Toast.LENGTH_SHORT).show();
}
} catch (IOException e) {
Log.d("Exception", e.toString());
} catch (JSONException e) {
Log.d("JsonException", e.toString());
}
}
I'm not sure that is the best solution but it works.

read json file form host showing white Screen in activity How can i solve this?

i want to read a JSON file from my host I made the internet permission and their is no exception in run just a White Screen and i don't
know what wrong,How can I solve this?
i expect a list that i made
json link here
The code is following
MainActivity:
package com.example.moham.twitter_ai;
public class MainActivity extends AppCompatActivity {
private List<tweets> tweetsList = new ArrayList<>();
private ListView listView;
private tweetAdapter madapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = findViewById(R.id.list);
madapter = new tweetAdapter(this, tweetsList);
listView.setAdapter(madapter);
gettweets();
}
void gettweets() {
String url = "https://mohammedhemaid.000webhostapp.com/jsonTest.json";
StringRequest postRequest = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject object = new JSONObject(response);
String tweetText = object.getString("text");
String date = object.getString("timestamp_ms");
JSONObject user = object.getJSONObject("user");
String name = user.getString("name");
String screen_name = user.getString("screen_name");
tweets tw =
new tweets(name, screen_name, tweetText,date);
tweetsList.add(tw);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this,error.getMessage()
,Toast.LENGTH_LONG).show();
}
});
Volley.newRequestQueue(this).add(postRequest);
}
}
Adapter :
/**
* Created by moham on 27-Apr-18.
*/
public class tweetAdapter extends ArrayAdapter<tweets> {
public tweetAdapter(#NonNull Context context,List<tweets> tweets) {
super(context, 0,tweets);
}
#NonNull
#Override
public View getView(int position, #Nullable View convertView, #NonNull
ViewGroup parent) {
View listItemView = convertView;
if (listItemView == null) {
listItemView = LayoutInflater.from(getContext()).inflate(
R.layout.list_item, parent, false);
}
tweets currentTweets = getItem(position);
TextView name = listItemView.findViewById(R.id.tv_name);
name.setText(currentTweets.getName());
TextView screenName = listItemView.findViewById(R.id.tv_screen_name);
screenName.setText(currentTweets.getScreenName());
TextView tweetText = listItemView.findViewById(R.id.tv_tweet_text);
tweetText.setText(currentTweets.getTweet());
Date dateObject = new Date(currentTweets.getTimeStamp());
TextView dateView = listItemView.findViewById(R.id.date);
// Format the date string (i.e. "Mar 3, 1984")
dateView.setText(currentTweets.getTimeStamp());
return listItemView;
}
}
error:(logCat)
JsonFile:
{"created_at":"Mon Mar 26 18:24:04 +0000 2018","id":978336799520100352,"id_str":"978336799520100352","text":"Ik wilde gwn een gratis gun en die krijg ik nu dus \ud83d\ude02 https:\/\/t.co\/AH38GYbUfk","source":"\u003ca href=\"http:\/\/twitter.com\/download\/iphone\" rel=\"nofollow\"\u003eTwitter for iPhone\u003c\/a\u003e","truncated":false,"in_reply_to_status_id":null,"in_reply_to_status_id_str":null,"in_reply_to_user_id":null,"in_reply_to_user_id_str":null,"in_reply_to_screen_name":null,"user":{"id":964059877223084032,"id_str":"964059877223084032","name":"Wessel hoek","screen_name":"teddybeer025","location":null,"url":null,"description":"ik speel fortnite op de ps4","translator_type":"none","protected":false,"verified":false,"followers_count":2,"friends_count":10,"listed_count":1,"favourites_count":17,"statuses_count":7,"created_at":"Thu Feb 15 08:52:40 +0000 2018","utc_offset":null,"time_zone":null,"geo_enabled":false,"lang":"nl","contributors_enabled":false,"is_translator":false,"profile_background_color":"F5F8FA","profile_background_image_url":"","profile_background_image_url_https":"","profile_background_tile":false,"profile_link_color":"1DA1F2","profile_sidebar_border_color":"C0DEED","profile_sidebar_fill_color":"DDEEF6","profile_text_color":"333333","profile_use_background_image":true,"profile_image_url":"http:\/\/pbs.twimg.com\/profile_images\/964065505513476102\/4hCVGSKG_normal.jpg","profile_image_url_https":"https:\/\/pbs.twimg.com\/profile_images\/964065505513476102\/4hCVGSKG_normal.jpg","default_profile":true,"default_profile_image":false,"following":null,"follow_request_sent":null,"notifications":null},"geo":null,"coordinates":null,"place":null,"contributors":null,"is_quote_status":false,"quote_count":0,"reply_count":0,"retweet_count":0,"favorite_count":0,"entities":{"hashtags":[],"urls":[{"url":"https:\/\/t.co\/AH38GYbUfk","expanded_url":"https:\/\/itunes.apple.com\/app\/id1333542838","display_url":"itunes.apple.com\/app\/id13335428\u2026","indices":[53,76]}],"user_mentions":[],"symbols":[]},"favorited":false,"retweeted":false,"possibly_sensitive":false,"filter_level":"low","lang":"nl","timestamp_ms":"1522088644281"}
What Im I doing wrong ?

You're adding the empty list before you getting, so when you add items to the list the adapter dosn't know it needs to refresh. After you've added all new items to your list, call:
madapter.notifyDatasetChanged()
To refresh your adapter.
Moreover, you json doesn't seem to be a valid one. I've tested it with JsonLint and it looks like a list of tweets but it isn't enclosed in [] nor separated by commas.
If your json was a valid array of tweets, your code should look like this:
JSONArray objs = new JSONArray(response);
for(JSONObject object : objs){
String tweetText = object.getString("text");
String date = object.getString("timestamp_ms");
JSONObject user = object.getJSONObject("user");
String name = user.getString("name");
String screen_name = user.getString("screen_name");
tweets tw =
new tweets(name, screen_name, tweetText,date);
tweetsList.add(tw);
}
madapter.notifyDatasetChanged();

how to set text according to country item in android?

I am getting country name from spinner , now i want to set country code according to spinner item in edittext ...but i dont to know how to set according to spinner item ...
this is code (here i am getting country name from spinner):
pmmobile = (EditText) findViewById(R.id.mob);
private void getCountryData(){
StringRequest stringRequest = new StringRequest(DATA_URL,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
JSONObject j = null;
try {
Log.d("Test",response);
JSONArray result = new JSONArray(response);
//Calling method getCountry to get the Country from the JSON Array
getCountry(result);
} catch (JSONException e) {
e.printStackTrace();
}
}
},new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}});
RequestQueue requestQueue = Volley.newRequestQueue(this);
//Adding request to the queue
requestQueue.add(stringRequest);
}
private void getCountry(JSONArray jsonArrayCountry){
//Traversing through all the items in the json array
List<Country> countries = new ArrayList<>();
try {
String country_name, country_code;
JSONObject countries_object;
for (int i = 0; i < jsonArrayCountry.length(); i++) {
countries_object = jsonArrayCountry.getJSONObject(i);
country_code = countries_object.getString("id");
country_name = countries_object.getString("Name");
countries.add(new Country(country_code, country_name));
}
ArrayAdapter countryAdapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, countries);
pmcountry.setPrompt("Select Country");
pmcountry.setAdapter(countryAdapter);
pmcountry.setAdapter(new NothingSelectedSpinnerAdapter(countryAdapter,
R.layout.contact_spinner_row_nothing_selected,this));
pmcountry.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
} catch (JSONException e) {
Log.e("PMSearchActivity", e.getLocalizedMessage(), e);
}
}
i want to set country code in pmmobile..kindly help, new to android.
this is my json:
[
{
"id": "1",
"Name": "Afghanistan",
"CountryCode": "AF",
"CountryIso": "AFG"
},
{
"id": "2",
"Name": "Albania",
"CountryCode": "AL",
"CountryIso": "ALB"
},

I suppose that if you want to display a String you are going to use a TextView, not an EditText.
Anyway:
pmmobile.setText(<... string or string res ID ...>);
Simple as that.
To keep it asynchronous I suppose that you should put this inside one of your listeners, for example onItemSelected().
Update.
Being not aware of what you are trying to do, I suggest you anyway to browse the constants inside the Locale utility class. You can get all the language ISO codes and what you need from handy constants and utilities from there, without getting crazy with json and similar stuff.
Locale.COUNTRY.getLanguage();
or
Locale.getISOLanguages();
Although I don't know if this is what you need.

JSON parsing and displaying into a recycler-card view fragment

I am trying to parse json with volley and display with recycler-card view in my tabbed fragment class in android. The json response is not displayed in the fragment. No errors or exceptions are shown. The app runs fine but no data is displayed. Take a look at the code below and tell me where I went wrong.
My Fragment Class
public class Latest_News extends Fragment {
private RecyclerView recyclerView;
private List<NewsItems> newsItemsList = new ArrayList<>();
private static final String TAG = Latest_News.class.getSimpleName();
private NewsItems newsItems;
public Latest_News() {
// Required empty public constructor
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
networkAvailable();
}
#Override
public View onCreateView(LayoutInflater inflater, final ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View mView = inflater.inflate(R.layout.fragment_latest__news, container, false);
recyclerView = (RecyclerView) mView.findViewById(R.id.latestNews_recyclerView);
recyclerView.setHasFixedSize(true);
LinearLayoutManager llMan = new LinearLayoutManager(getContext());
llMan.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(llMan);
//recyclerView.setAdapter(new HomeFrag_RecyclerAdapter(getActivity(), newsItemsList));
if (networkAvailable()){
String url = "www.goal.com/api"; // fake url, pls dont mind
RequestQueue mRequestQueue = Volley.newRequestQueue(getActivity().getApplicationContext());
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, url, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONObject newsObject = new JSONObject(response.toString());
String title = newsObject.getString("title");
String time = newsObject.getString("time");
String date = newsObject.getString("date");
String link = newsObject.getString("link");
String content = newsObject.getString("content");
String image = newsObject.getString("image" + "");
newsItems = new NewsItems();
newsItems.setImage_Id(Integer.parseInt(image));
newsItems.setNewsDate(date);
newsItems.setNewTitle(title);
newsItems.setNewsDesc(content);
newsItems.setNewsUrl(link);
newsItems.setNewsTime(time);
newsItemsList.add(newsItems);
} catch (JSONException e) {
e.printStackTrace();
}
recyclerView.setAdapter(new HomeFrag_RecyclerAdapter(getActivity(), newsItemsList));
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.i(TAG,"Error is: " + error.toString());
}
});
mRequestQueue.add(jsonObjectRequest);
}
else{
Toast.makeText(getActivity(), "Turn On Mobile Data or Wifi", Toast.LENGTH_SHORT).show();
}
return mView;
}
private boolean networkAvailable() {
ConnectivityManager cm = (ConnectivityManager) getContext().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = cm.getActiveNetworkInfo();
boolean isAvailable = false;
if (networkInfo != null && networkInfo.isConnected()){
isAvailable = true;
}
return isAvailable;
}
}
Fragment Adapter Code is Shown Below:
public class HomeFrag_RecyclerAdapter extends RecyclerView.Adapter<HomeFrag_RecyclerAdapter.MyHolder> {
private Context context;
List<NewsItems> newsItemsList;
public HomeFrag_RecyclerAdapter(Context context, List<NewsItems> newsItemsList) {
this.context = context;
this.newsItemsList = newsItemsList;
}
#Override
public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.tab_frags_customview,parent,false);
return new MyHolder(v);
}
#Override
public void onBindViewHolder(MyHolder holder, int position) {
holder.title.setText(newsItemsList.get(position).getNewTitle());
holder.descn.setText(newsItemsList.get(position).getNewsDesc());
holder.time.setText(newsItemsList.get(position).getNewsTime());
holder.date.setText(newsItemsList.get(position).getNewsDate());
int i = position;
Picasso.with(context).load(newsItemsList.get(i).getImage_Id())
.centerCrop()
.error(R.drawable.ic_toc_black_24dp)
.into(holder.coverImg);
}
#Override
public int getItemCount() {
return newsItemsList.size();
}
public class MyHolder extends RecyclerView.ViewHolder{
private TextView title, descn, time, date;
private ImageView coverImg;
public MyHolder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.news_titleTxt);
descn = (TextView) itemView.findViewById(R.id.news_DescTxt);
time = (TextView) itemView.findViewById(R.id.news_TimeTxt);
date = (TextView) itemView.findViewById(R.id.newsDateTxt);
coverImg = (ImageView) itemView.findViewById(R.id.newsImage);
}
}
}
Sample JSON to be parsed
<pre>
{
"0": {
"image": null,
"title": "Suresh Raina to miss 2nd ODI against New Zealand ",
"time": "08:29 pm ",
"date": "18 Oct ",
"content": "Indian cricketer Suresh Raina will miss the second ODI against New Zealand at Delhi on Thursday. ...",
"link": "https://full-story.newsinshorts.com/v1/article/a659a7be-0c4d-408c-851d-689da6b95498-1 "
},
"1": {
"image": null,
"title": "Harley-Davidson net income falls by 18.67% to $114 mn ",
"time": "08:29 pm ",
"date": "18 Oct ",
"content": "Motorcycle manufacturer Harley-Davidson on Tuesday reported an 18.67% year-on-year decline in net ...",
"link": "https://full-story.newsinshorts.com/v1/article/448cc170-1d42-4109-9c50-0fe3a3c36f44-1 "
},
"2": {
"image": null,
"title": "JNU to get 200 solar power operated street lights ",
"time": "08:27 pm ",
"date": "18 Oct ",
"content": "The Jawaharlal Nehru University in Delhi is set to get 200 solar power operated street lights, Vice ...",
"link": "https://full-story.newsinshorts.com/v1/article/96db26c8-be8f-4313-8d51-27fee9bd084d-1 "
},
"3": {
"image": null,
"title": "Patiala Court dismisses fake degree case against Irani ",
"time": "08:22 pm ",
"date": "18 Oct ",
"content": "Patiala House Court today dismissed a case against Union Minister Smriti Irani for allegedly ...",
"link": null
},
</pre>
XML layout for the Fragment Class above:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.joey.mydrawerapp.Fragments.HomeFragment_Fragments.Latest_News">
<!-- TODO: Update blank fragment layout -->
<include layout="#layout/recyclerview_layout"
android:id="#+id/latestNews_recyclerView"/>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="30sp"
android:gravity="center"
android:textStyle="bold"
android:text="Stay Tuned For Latest News" />
</RelativeLayout>

I generally don't parse JSON by hand anymore, I always use Gson or jackson. Provided your json is correct, your onResponse can look something like this:
StringRequest stringRequest = new StringRequest(Request.Method.POST, url,
new Response.Listener<String>() {
#Override
public void onResponse(String response)
#Override
public void onResponse(Stringresponse) {
Gson gson = new Gson();
Map<String,Item> map = gson.fromJson(response, new TypeToken<Map<String,Item>>(){}.getType());
newsItemLists = new ArrayList(); // Clear the list if desired
for (Item item : map.values()) {
newsItems = new NewsItems();
// Copy all item attributes to newsItems here.
// if NewsItems is annotated correct, it can even be used to parse
// the json instead of the Item class below.
newsItemsList.add(newsItems);
}
// Move this line into the onCreate() initializng the adapter with an empty list.
//recyclerView.setAdapter(new HomeFrag_RecyclerAdapter(getActivity(), newsItemsList));
// add this to notify the adapter that the list has changed.
adapter.notifyDataSetChanged();
}
You will need a pojo for the gson object:
class Item {
String image;
String title;
String time;
String date;
String content;
String link;
}
Update
I've updated my answer just a bit to make a StringRequest Volley instead of a JSONRequest. We'll use the whole string response and parse it as JSON. Alternatively, you can change your Volley JsonObjectRequest to a JsonArrayRequest and receive a JSON array. Then you'll loop over each item in the array and parse it out.

Parse JSON data into a ListView

I know that there are several similar questions already answered, but because the fact that I'm very new to Android development, I couldn't figure out how to solve this on my own. The question is pretty self-explanatory. I'm fetching data from the database over HTTP request and want to adapt that data into a listview. I'm using Volley for my HTTP requests and underneath is my onResponse -method.
Everything else works perfectly, I just haven't found a way to adapt that data into a listview.
#Override
public void onResponse(String response) {
Log.d(TAG, response.toString());
// If we are getting success from server
try {
JSONObject jObject = new JSONObject(response);
int count = jObject.getInt("count");
if(count == 0) {
noEventsTextView.setText(jObject.getString("msg").toString());
noEventsTextView.setGravity(Gravity.CENTER);
noEventsImageView.setVisibility(View.VISIBLE);
} else {
JSONArray childArray = jObject.getJSONArray("lectures");
for(int i = 0; i < childArray.length(); i++) {
JSONObject finalObject = childArray.getJSONObject(i);
// TODO Adapt data to listView
}
}
} catch(JSONException e) {
e.printStackTrace();
}
}
}
And here's an example of JSON I get back from the server:
{
count: 2,
msg: "",
lectures: [
{
id: "1",
starting_at: "2015-11-30 13:00:00",
ending_at: "2015-11-30 15:00:00",
user_id: "1",
course: "Course #1",
user_name: "John Doe"
},
{
id: "2",
starting_at: "2015-11-30 13:00:00",
ending_at: "2015-11-30 15:00:00",
user_id: "1",
course: "Course #2",
user_name: "John Doe"
}
]
}

Create a class of each key value pairs of Json and the map your json to that class using Jackson and the add generic list of that class to your List Adapter .
Like
Custom Class{
String id;
String starting_at;
String ending_at;
String user_id;
String course ;
String username;
}
Map your response through Jackson to ArrayList
and then
ListAdapter(ArrayList)
https://w2davids.wordpress.com/android-json-parsing-made-easy-using-jackson/
and you are ready to go.......you can use gson also but jackson is a bit faster so you can go for anyone according to ur need......
hope it helps.

create array Variables for each key value pairs of Json.
and pass all those variable to a listview.
new Listadapter(this,id[],starting_at[],ending_at[],user_id[],course[],username[]);
or There is a concept called Gson.
which will allow you to write data to Serializable class without using array.
And after assigning data to these class you can pass the Serializable class to adapter and used it inside adapter getView method.
There is a simple tutorial on this which I wrote to assign data to serializable class, think it will give you an idea.
hope it helps.

You can have a POJO consisting of all the keys a lecture has.
DataPOJO.java
public class DataPOJO {
private int id;
private String starting_at;
private String ending_at;
private String user_id;
private String course;
private String user_name;
}
Inside your onResponse:
#Override
public void onResponse(String response) {
Log.d(TAG, response.toString());
// If we are getting success from server
try {
JSONObject jObject = new JSONObject(response);
int count = jObject.getInt("count");
if(count == 0) {
noEventsTextView.setText(jObject.getString("msg").toString());
noEventsTextView.setGravity(Gravity.CENTER);
noEventsImageView.setVisibility(View.VISIBLE);
} else {
JSONArray childArray = jObject.getJSONArray("lectures");
ArrayList<DataPOJO> datas = new ArrayList<DataPOJO>();
for(int i = 0; i < childArray.length(); i++) {
JSONObject finalObject = childArray.getJSONObject(i);
DataPOJO data = new DataPOJO;
data.id = finalObject.getInt("id");
data.starting_at = finalObject.getString("starting_at");
//so on
//add data to arraylist......
datas.add(data);
}
//set adapter of your listview here, you have to have an instance of your list view
listView.setAdapter(new MyAdapter(datas, context));
}
} catch(JSONException e) {
e.printStackTrace();
}
}
}
MyAdapter.java
public class MyAdapter extends BaseAdapter {
private Context mContext;
private ArrayList<DataPOJO> listItem;
public MyAdapter(Context mContext, ArrayList<DataPOJO> listItem) {
this.mContext = mContext;
this.listItem = listItem;
}
#Override
public int getCount() {
return listItem.size();
}
#Override
public Object getItem(int position) {
return listItem.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null)
convertView = LayoutInflater.from(mContext).inflate(R.layout.list_items, null);
((TextView) convertView.findViewById(R.id.name)).setText(listItem.get(position).user_name);
return convertView;
}
}
list_items.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView android:id="#+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:textColor="#000"
android:textSize="18sp"/>
</RelativeLayout>