I have a JSON data from YouTube. I want to show data in LIST VIEW. But when i run my code I get a blank page. But I have the respond of YouTube DATA API. How can I solve it?
public class MainActivity extends ListActivity {
private ProgressDialog pDialog;
// URL to get contacts JSON
private static String url = "https://www.googleapis.com/youtube/v3/search?part=snippet&maxResult=30&q=natok+bangla+mosharrof+karim&key=AIzaSyCR40QlsuX0aFfBV-wEPDsH_jxna1tDFRA";
private static final String TAG_ITEMS = "items";
private static final String TAG_ID = "id";
private static final String TAG_ID_VIDEOID = "vid";
private static final String TAG_TITLE = "title";
private static final String TAG_DESCRIPTION = "description";
private static final String YouTubeThumbnail = "https://i.ytimg.com/vi/hlaX2OZ_kDg/default.jpg";
private static final String TAG_CHANNELTITLE = "channelTitle";
JSONArray items = null;
// Hashmap for ListView
ArrayList<HashMap<String, String>> dataList;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dataList = new ArrayList<HashMap<String, String>>();
ListView lv = getListView();
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String vid = ((TextView) view.findViewById(R.id.name))
.getText().toString();
String title = ((TextView) view.findViewById(R.id.email))
.getText().toString();
String description = ((TextView) view.findViewById(R.id.mobile))
.getText().toString();
// Starting single contact activity
Intent in = new Intent(getApplicationContext(),
SingleContactActivity.class);
in.putExtra(TAG_ID_VIDEOID, vid);
in.putExtra(TAG_TITLE, title);
in.putExtra(TAG_DESCRIPTION, description);
startActivity(in);
}
});
new GetContacts().execute();
}
private class GetContacts extends AsyncTask<Void, Void, Boolean> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Boolean doInBackground(Void... arg0) {
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
ArrayList<HashMap<String, String>> dataList = new ArrayList<HashMap<String,String>>();
int count = 0;
try {
JSONObject js = new JSONObject(jsonStr);
JSONArray jsItem = js.getJSONArray("items");
for (int i = 0; i < jsItem.length(); i++) {
JSONObject item = jsItem.getJSONObject(i);
JSONObject vid =item.getJSONObject("id");
String videoId = getStringResult(vid.toString(), "videoId");
if (!videoId.equalsIgnoreCase(""))
{
JSONObject snippet =item.getJSONObject("snippet");
String title = sh.getStringResult(snippet.toString(), "title");
HashMap<String, String> map = new HashMap<String, String>();
map.put("name", title);
map.put("vid", videoId);
map.put ("img","http://img.youtube.com/vi/" + videoId + "/hqdefault.jpg");
map.put ("id",++count+"");
dataList.add(map);
}
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return true;
}
#Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
MainActivity.this, dataList,R.layout.list_item, new String[] { TAG_TITLE, TAG_DESCRIPTION,
TAG_CHANNELTITLE }, new int[] { R.id.name,
R.id.email, R.id.mobile });
setListAdapter(adapter);
}
}
public String getStringResult(String data, String node) {
try {
JSONObject js = new JSONObject(data);
return js.getString(node);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return "";
}
}
Use notifyDataSetChanged(). This notifies a change in data and updated the list view. LINK
Here are the changes that would help:
public class MainActivity extends ListActivity {
...
ListAdapter adapter = null;
#Override
public void onCreate(Bundle savedInstanceState) {
...
ListView lv = getListView();
adapter = new SimpleAdapter(
MainActivity.this, dataList,R.layout.list_item, new String[] { TAG_TITLE, TAG_DESCRIPTION,
TAG_CHANNELTITLE }, new int[] { R.id.name,
R.id.email, R.id.mobile });
lv.setListAdapter(adapter);
...
}
private class GetContacts extends AsyncTask<Void, Void, Boolean> {
#Override
protected void onPreExecute() {
...
}
#Override
protected Boolean doInBackground(Void... arg0) {
...
}
#Override
protected void onPostExecute(Boolean result) {
if(adapter ! = null) {
adapter.notifyDataSetChanged();
}
}
public String getStringResult(String data, String node) {
...
}
Explanation:
ListAdapter is the bridge between a ListView and the data that backs the list.
Whenever the data is changed, adapter is responsible to notify about the changed data and consequently the view gets updated with the new data. This is achieved by notifyDataSetChanged().
For some more details, please go through this link.
Related
So I'm stuck on this... I need to display images in a listview which gets its data from a json file.
I've already setup the connection, parsed the json file and displayed what i need. But somehow I can't find much information about how to turn a string (which has the URL) into an image in a listview.
The string which has the url is called "ImageLink"
Below is my MainActivity.
public class MainActivity extends ListActivity {
private ProgressDialog pDialog;
// URL to get game info JSON
private static String url = "https://dl.dropboxusercontent.com/u/38379784/Upcoming%20Games/DataForUPG.js";
// JSON Node names
private static final String TAG_Games = "games";
private static final String TAG_Title = "Title";
private static final String TAG_Description = "Description";
private static final String TAG_Release = "Release";
private static final String TAG_ImageLink = "ImageLink";
// Gameinfo JSONArray
JSONArray games = null;
// Hashmap for ListView
ArrayList<HashMap<String, String>> GamesList;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
GamesList = new ArrayList<HashMap<String, String>>();
ListView lv = getListView();
// Listview on item click listener
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String Title = ((TextView) view.findViewById(R.id.Title))
.getText().toString();
String Description = ((TextView) view.findViewById(R.id.Description))
.getText().toString();
String Release = ((TextView) view.findViewById(R.id.Release))
.getText().toString();
String ImageLink = ((TextView) view.findViewById(R.id.ImageLink_label))
.getText().toString();
// Starting single contact activity
Intent in = new Intent(getApplicationContext(),
SingleListItem.class);
in.putExtra(TAG_Title, Title);
in.putExtra(TAG_Description, Description);
in.putExtra(TAG_Release, Release);
in.putExtra(TAG_ImageLink, ImageLink);
startActivity(in);
}
});
// Calling async task to get json
new GetGames().execute();
}
/**
* Async task class to get json by making HTTP call
* */
private class GetGames extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Loading Data...");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
games = jsonObj.getJSONArray(TAG_Games);
// looping through All games
for (int i = 0; i < games.length(); i++) {
JSONObject c = games.getJSONObject(i);
String Title = c.getString(TAG_Title);
String Description = c.getString(TAG_Description);
String Release = c.getString(TAG_Release);
String ImageLink = c.getString(TAG_ImageLink);
// tmp hashmap for single game
HashMap<String, String> games = new HashMap<String, String>();
// adding each child node to HashMap key => value
games.put(TAG_Title, Title);
games.put(TAG_Description, Description);
games.put(TAG_Release, Release);
games.put(TAG_ImageLink, ImageLink);
// adding contact to gameinfo list
GamesList.add(games);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
MainActivity.this, GamesList,
R.layout.list_item, new String[] { TAG_Title, TAG_Release,
TAG_Description, TAG_ImageLink }, new int[] { R.id.Title,
R.id.Release, R.id.Description, R.id.ImageLink_label });
setListAdapter(adapter);
}
}
}
I would appreciate any help
Well, you could probably create another async task to handle downloading the image like this:
private class DownloadImg extends AsyncTask<String, Void, Bitmap>{
#Override
protected Bitmap doInBackground(String... params) {
// TODO Auto-generated method stub
String TAG_ImageLink = params[0];
Bitmap bm = null;
try {
InputStream in = new java.net.URL(TAG_ImageLink).openStream();
bm = BitmapFactory.decodeStream(in);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return bm;
}
#Override
protected void onPostExecute(Bitmap result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
}
}
or you could use a 3rd party image loading library like picasso or volley's ImageRequest
I'm really new to android programming, I successfully get data from server and then populated into a listview. But how do I auto-refresh the listview items within certain amount of time? There maybe new items coming in from the server when I refresh the new items may appear.
Here's my code of retrieving data from server:
public class TabActivityQueue extends Fragment {
ListView list;
TextView number;
TextView info;
TextView remark;
TextView statuss;
Button Btngetdata;
ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
//URL to get JSON Array
private static String url = "http://172.22.85.235:8080/Qproject/servlet/Qaction?action_flag=find";
//JSON Node Names
private static final String Table2 = "table2";
private static final String phonenumber = "phonenumber";
private static final String peoplenumber = "peoplenumber";
private static final String remarks = "remarks";
private static final String status = "status";
JSONArray table2 = null;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
//This layout contains your list view
View view = inflater.inflate(R.layout.activity_tab_activity_queue, container, false);
return view;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
oslist = new ArrayList<HashMap<String, String>>();
Btngetdata = (Button)getView().findViewById(R.id.getdata);
Btngetdata.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
new JSONParse().execute();
}
});
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
public ProgressDialog pDialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
number = (TextView)getView().findViewById(R.id.number);
info = (TextView)getView().findViewById(R.id.info);
remark = (TextView)getView().findViewById(R.id.remark);
statuss = (TextView)getView().findViewById(R.id.statuss);
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
public JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json = jParser.getJSONFromUrl(url);
return json;
}
#Override
public void onPostExecute(JSONObject json) {
pDialog.dismiss();
try {
// Getting JSON Array from URL
table2 = json.getJSONArray(Table2);
for(int i = 0; i < table2.length(); i++){
JSONObject c = table2.getJSONObject(i);
// Storing JSON item in a Variable
String number = c.getString(phonenumber);
String info = c.getString(peoplenumber);
String remark = c.getString(remarks);
String statuss = c.getString(status);
// Adding value HashMap key => value
HashMap<String, String> map = new HashMap<String, String>();
map.put(phonenumber, number);
map.put(peoplenumber, info);
map.put(remarks, remark);
map.put(status, statuss);
oslist.add(map);
list=(ListView)getView().findViewById(R.id.list);
ListAdapter adapter = new SimpleAdapter(getActivity(), oslist,
R.layout.list_view,
new String[] { phonenumber,peoplenumber, remarks,status }, new int[] {
R.id.number,R.id.info, R.id.remark,R.id.statuss});
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
//Toast.makeText(getActivity(), "You Clicked at "+oslist.get(+position).get("name"), Toast.LENGTH_SHORT).show();
String numberr = oslist.get(position).get("phonenumber");
Intent intent = new Intent(getActivity(), ThreeButton.class);
intent.putExtra("key", numberr);
startActivity(intent);
}
}
);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
i would recommend you to use handler for refreshing data. i.e
final Handler handler = new Handler();
Runnable refresh = new Runnable() {
#Override
public void run() {
new JSONParse().execute();
handler.postDelayed(this, 60 * 1000);
}
};
handler.postDelayed(refresh, 60 * 1000);
this handler refresh data for every minute.
To prevent the adding the same data in list view you should use following things :
Please paste following code inside the onPost() method of the AsyncTask before for loop :
if(oslist!=null && oslist.size()>0)
oslist.clear();
I'm new to android. I want to put one of the activity under one of the tab of my app(the tab is fragment) when i paste my code into fragment, there's a lot of error...
There's error in new JSONParse().execute(); It shows that the type JSONParse is not visible.
in this line private class JSONParse extends AsyncTask there's error
showing illegal modifier for the class JSONParse.only public, abstract and final are permitted.
this line pDialog = new ProgressDialog(TabActivityQueue.this); it shows the constructor progressDialog is undefined.
All the variables phonenumber, peoplenumber , remarks, status, table2, url are not resolved as variables.
What should I change? I'm really stuck.
Here's the activity code :
public class MainActivity extends Activity {
ListView list;
TextView number;
TextView info;
TextView remark;
TextView statuss;
Button Btngetdata;
ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
//URL to get JSON Array
private static String url = "http://172.22.85.235:8080/Qproject/servlet/Qaction?action_flag=find";
//JSON Node Names
private static final String Table2 = "table2";
private static final String phonenumber = "phonenumber";
private static final String peoplenumber = "peoplenumber";
private static final String remarks = "remarks";
private static final String status = "status";
JSONArray table2 = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
oslist = new ArrayList<HashMap<String, String>>();
Btngetdata = (Button)findViewById(R.id.getdata);
Btngetdata.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
new JSONParse().execute();
}
});
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
number = (TextView)findViewById(R.id.number);
info = (TextView)findViewById(R.id.info);
remark = (TextView)findViewById(R.id.remark);
statuss = (TextView)findViewById(R.id.statuss);
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json = jParser.getJSONFromUrl(url);
return json;
}
#Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
try {
// Getting JSON Array from URL
table2 = json.getJSONArray(Table2);
for(int i = 0; i < table2.length(); i++){
JSONObject c = table2.getJSONObject(i);
// Storing JSON item in a Variable
String number = c.getString(phonenumber);
String info = c.getString(peoplenumber);
String remark = c.getString(remarks);
String statuss = c.getString(status);
// Adding value HashMap key => value
HashMap<String, String> map = new HashMap<String, String>();
map.put(phonenumber, number);
map.put(peoplenumber, info);
map.put(remarks, remark);
map.put(status, statuss);
oslist.add(map);
list=(ListView)findViewById(R.id.list);
ListAdapter adapter = new SimpleAdapter(MainActivity.this, oslist,
R.layout.list_item,
new String[] { phonenumber,peoplenumber, remarks,status }, new int[] {
R.id.number,R.id.info, R.id.remark,R.id.statuss});
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(MainActivity.this, "You Clicked at "+oslist.get(+position).get("name"), Toast.LENGTH_SHORT).show();
}
});
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
Here's the fragment where i pasted the activity code in :
public class TabActivityQueue extends Fragment {
ListView list;
TextView number;
TextView info;
TextView remark;
TextView statuss;
Button Btngetdata;
ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
//URL to get JSON Array
public static String url = "http://172.22.85.235:8080/Qproject/servlet/Qaction?action_flag=find";
//JSON Node Names
public static final String Table2 = "table2";
public static final String phonenumber = "phonenumber";
public static final String peoplenumber = "peoplenumber";
public static final String remarks = "remarks";
public static final String status = "status";
JSONArray table2 = null;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
//This layout contains your list view
View view = inflater.inflate(R.layout.activity_tab_activity_queue, container, false);
oslist = new ArrayList<HashMap<String, String>>();
number = (TextView)view.findViewById(R.id.number);
info = (TextView)view.findViewById(R.id.info);
remark = (TextView)view.findViewById(R.id.remark);
statuss = (TextView)view.findViewById(R.id.statuss);
Btngetdata = (Button)view.findViewById(R.id.getdata);
Btngetdata.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
new JSONParse().execute();
}
});
return view;
}
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(TabActivityQueue.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json = jParser.getJSONFromUrl(url);
return json;
}
#Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
try {
// Getting JSON Array from URL
table2 = json.getJSONArray(Table2);
for(int i = 0; i < table2.length(); i++){
JSONObject c = table2.getJSONObject(i);
// Storing JSON item in a Variable
String number = c.getString(phonenumber);
String info = c.getString(peoplenumber);
String remark = c.getString(remarks);
String statuss = c.getString(status);
// Adding value HashMap key => value
HashMap<String, String> map = new HashMap<String, String>();
map.put(phonenumber, number);
map.put(peoplenumber, info);
map.put(remarks, remark);
map.put(status, statuss);
oslist.add(map);
list=(ListView)findViewById(R.id.list);
ListAdapter adapter = new SimpleAdapter(MainActivity.this, oslist,
R.layout.list_item,
new String[] { phonenumber,peoplenumber, remarks,status }, new int[] {
R.id.number,R.id.info, R.id.remark,R.id.statuss});
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(MainActivity.this, "You Clicked at "+oslist.get(+position).get("name"), Toast.LENGTH_SHORT).show();
}
});
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
public class TabActivityQueue extends Fragment {
ListView list;
TextView number;
TextView info;
TextView remark;
TextView statuss;
Button Btngetdata;
ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
// URL to get JSON Array
public static String url = "http://172.22.85.235:8080/Qproject/servlet/Qaction?action_flag=find";
// JSON Node Names
public static final String Table2 = "table2";
public static final String phonenumber = "phonenumber";
public static final String peoplenumber = "peoplenumber";
public static final String remarks = "remarks";
public static final String status = "status";
JSONArray table2 = null;
private Activity activity;
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
// This layout contains your list view
View view = inflater.inflate(R.layout.activity_tab_activity_queue, container, false);
oslist = new ArrayList<HashMap<String, String>>();
number = (TextView) view.findViewById(R.id.number);
info = (TextView) view.findViewById(R.id.info);
remark = (TextView) view.findViewById(R.id.remark);
statuss = (TextView) view.findViewById(R.id.statuss);
Btngetdata = (Button) view.findViewById(R.id.getdata);
Btngetdata.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
new JSONParse().execute();
}
});
activity = this.getActivity();
return view;
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(activity);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json = jParser.getJSONFromUrl(url);
return json;
}
#Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
try {
// Getting JSON Array from URL
table2 = json.getJSONArray(Table2);
for (int i = 0; i < table2.length(); i++) {
JSONObject c = table2.getJSONObject(i);
// Storing JSON item in a Variable
String number = c.getString(phonenumber);
String info = c.getString(peoplenumber);
String remark = c.getString(remarks);
String statuss = c.getString(status);
// Adding value HashMap key => value
HashMap<String, String> map = new HashMap<String, String>();
map.put(phonenumber, number);
map.put(peoplenumber, info);
map.put(remarks, remark);
map.put(status, statuss);
oslist.add(map);
list = (ListView) findViewById(R.id.list);
ListAdapter adapter = new SimpleAdapter(activity, oslist, R.layout.list_item, new String[] {phonenumber, peoplenumber, remarks, status}, new int[] {R.id.number, R.id.info,
R.id.remark, R.id.statuss});
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(activity, "You Clicked at " + oslist.get(+position).get("name"), Toast.LENGTH_SHORT).show();
}
});
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
Whereever you have used context as TabActivityQueue.this (or getApplicationCOntext()) change to getActivity() .
Also if some android pre defined method doesn't work try prefix getActivity() like:- getActivity().method();
declare private Activity activity as public Activity activity;
I want to show the array list using JSON in fragment. The code works fine in activity but not in fragment. And the code is. I just want to display a list of data using JSON, if the user clicks the code the data must shown in another fragment.
package com.example.everwinvidhyashram;
public class PrincipalSpeechFragment extends Fragment implements OnClickListener {
private ProgressDialog pDialog;
private static String url =
"http://imaginetventures.net/sample/everwin_vidhyashram/webservice/rest/?module=speech&from=1-9-
2014&to=30-9-2014";
// JSON Node names
private static final String TAG_PRINCIPAL_SPEECH ="Principal Speech";
private static final String TAG_SPEECH= "speech";
private static final String TAG_DESC = "desc";
// contacts JSONArray
JSONArray contacts = null;
// Hashmap for ListView
ArrayList<HashMap<String, String>> speechlist;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_principal_speech, container, false);
return rootView;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
speechlist = new ArrayList<HashMap<String, String>>();
// ListView lv = getListView();
new GetContacts().execute();
}
private class GetContacts extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
/*Dialog = new ProgressDialog(PrincipalSpeechFragment.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();*/
}
#Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
ServiceHandler sh = new ServiceHandler();
String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
contacts = jsonObj.getJSONArray(TAG_PRINCIPAL_SPEECH);
// looping through All Contacts
for (int i = 0; i < 1; i++) {
JSONObject c = contacts.getJSONObject(i);
String id = c.getString(TAG_SPEECH);
// tmp hashmap for single contact
HashMap<String, String> speech = new HashMap<String, String>();
// adding each child node to HashMap key => value
speech.put(TAG_SPEECH, id);
// speech.put(TAG_DESC, name);
// adding contact to contact list
speechlist.add(speech);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(PrincipalSpeechFragment.this, speechlist,
R.layout.principal_speech_items, new String[] { TAG_SPEECH,
}, new int[] { R.id.principal,
});
setListAdapter(adapter);
}
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}
The problem occurs in
ListAdapter adapter = new SimpleAdapter(PrincipalSpeechFragment.this, speechlist,
R.layout.principal_speech_items, new String[] { TAG_SPEECH,
}, new int[] { R.id.principal,
});
setListAdapter(adapter);
I have used this list adapter in the fragment. May be help.
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
getActivity().runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter =new SimpleAdapter(
getActivity(), speechlist,
R.layout.principal_speech_items, new String[] { TAG_SPEECH },
new int[] { R.id.principal });
// updating listview
setListAdapter(adapter);
}//run
});//runOnUiThread
}//onpostexecute
This is my code i can't create the multiple choice mode listview.
Data is fetched by jason and set in the listview.
I want to multiple selection choice mode on the list view
public class ExamView extends ListActivity{
private ProgressDialog pDialog;
Intent activity;
// URL to get contacts JSON
// JSON Node names
private static final String TAG_USERMST = "products";
private static final String TAG_QID = "que_id";
private static final String TAG_QUE = "question";
private static final String TAG_QANS = "ans";
JSONArray products = null;
// Hashmap for ListView
ArrayList<HashMap<String, String>> contactList;
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.user_activity_lv);
contactList = new ArrayList<HashMap<String, String>>();
ListView lv = getListView();
new GetContacts().execute();
}
private class GetContacts extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(ExamView.this);
pDialog.setMessage("Exam Paper is downloading...");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
products = jsonObj.getJSONArray(TAG_USERMST);
// looping through All Contacts
for (int i = 0; i < products.length(); i++) {
JSONObject c = products.getJSONObject(i);
String queid = c.getString(TAG_QID);
String que = c.getString(TAG_QUE);
String queans = c.getString(TAG_QANS);
// tmp hashmap for single contact
HashMap<String, String> product = new HashMap<String, String>();
// adding each child node to HashMap key => value
product.put(TAG_QID,queid);
product.put(TAG_QUE, que);
product.put(TAG_QANS, queans);
// adding contact to contact list
contactList.add(product);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
ExamView.this, contactList,
R.layout.user_list_item_lbl, new String[] { TAG_QID, TAG_QUE,
TAG_QANS }, new int[] { R.id.name,
R.id.email, R.id.mobile });
setListAdapter(adapter);
}
}
getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
setListAdapter(new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_multiple_choice, array_sort));
Use this code its working for me.
Here array_sort is an arraylist i.e. list of all the items to be displayed.
Multiple items can be selected with this.