Develop Reference

Displaying an ArrayList<Strings> or List<Strings> in a ListView

I just can't seem to get it to work, I have tried many different things, the parsing works fine and returns a list of titles in an arraylist and I can't get them to then view on the ListView. Here is the code;
/**
* Created by Matt on 4/21/2015.
*/
public class Discussion_Fragment extends Fragment {
View rootview;
ListView listView;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootview = inflater.inflate(R.layout.discussion_layout, container, false);
ArrayList<String> titles = new ArrayList<String>();
listView = (ListView) rootview.findViewById(R.id.listView1);
parse(getHTTP("https://www.reddit.com/r/DotA2.json?limit=10"));
for(int i=0;i<titles.size();i++){
titles.add(titles.get(i));
}
ArrayAdapter saAdapter = new ArrayAdapter(getActivity(), R.layout.discussion_layout, titles);
listView.setAdapter(saAdapter);
return rootview;
}
public static String getHTTP(String urlToRead) {
URL url;
HttpURLConnection conn;
BufferedReader rd;
String line;
String result = "";
boolean response = false;
while (!response)
{
try {
url = new URL(urlToRead);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
while ((line = rd.readLine()) != null) {
result += line;
}
rd.close();
response = true;
} catch (IOException e) {
e.printStackTrace();
try {
Thread.sleep(600);
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
}
return result;
}
public static List<String> parse(String httpResponse)
{
ArrayList<String> titles = new ArrayList<String>();
try {
JSONObject obj = new JSONObject(httpResponse);
//JSONObject posts = obj.getJSONObject("kind");
JSONObject posts1 = obj.getJSONObject("data");
JSONArray posts2 = posts1.getJSONArray("children");
for (int i = 0; i < posts2.length(); i++) {
JSONObject test = posts2.getJSONObject(i);
JSONObject test1 = test.getJSONObject("data");
Object test2 = test1.get("title");
titles.add(test2.toString());
}
}
catch(Exception e) {
e.printStackTrace();
}
return titles;
}
}

You should do like
List<String> titles = parse(getHTTP("https://www.reddit.com/r/DotA2.json?limit=10"));
As parse(...) method return List<String>

replace this:
parse(getHTTP("https://www.reddit.com/r/DotA2.json?limit=10"));
for(int i=0;i<titles.size();i++){
titles.add(titles.get(i));
}
with this:
titles = parse(getHTTP("https://www.reddit.com/r/DotA2.json?limit=10"));

Move your getHTTP() in AsynTask as you are fetching data on main thread. Do it in background.

Trying to query for Facebook profiles and sort them into a ListView Android

I am using the Facebook Graph API to request a list of Facebook profiles and return them in a ListView displaying both names and profile pictures. I have two EditText fields in my main acitivty to enter both first and second names. A button starts my ListViewActivity when clicked and the names are passed. The ListView inflates and the request is sent to Facebook and each row in the ListView is updated using a custom adapter.
The problem is, I suspect, a memory leak. It is very temperamental as in, it would work once or twice if I'm lucky and any other attempts to update the ListView wouldn't work, the activity would remain blank. It doesn't work for some more common names either.
Below is my ListViewActivity:
public class ListViewActivity extends Activity implements OnItemClickListener {
public String firstname, secondname;
URL imageURL;
ArrayList<String> names = new ArrayList<String>();
ArrayList<Bitmap> bitmaps = new ArrayList<Bitmap>();
public static final String[] descriptions = new String[] {"Description"};
ListView listView;
List<RowItem> rowItems;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout);
loadData();
rowItems = new ArrayList<RowItem>();
listView = (ListView) findViewById(R.id.listview);
CustomListViewAdapter adapter = new CustomListViewAdapter(this,
R.layout.list_item, rowItems);
listView.setAdapter(adapter);
listView.setOnItemClickListener(this);
}
public void loadData() {
Session session = Session.getActiveSession();
firstname = getIntent().getExtras().getString("firstname");
secondname = getIntent().getExtras().getString("secondname");
if(session==null){
session = Session.openActiveSessionFromCache(this);
} else if (session.isOpened()) {
Bundle params = new Bundle();
params.putString("fields", "name, picture, url, id");
params.putString("limit", "10");
Request request = new Request(session, "search?q="+ firstname + "%20" + secondname + "&limit=10&type=user&fields=name,picture", params, HttpMethod.GET, new Request.Callback() {
#Override
public void onCompleted(Response response) {
// TODO Auto-generated method stub
JSONObject jsonObject = null;
JSONArray jArray = null;
imageURL = null;
try {
jsonObject = new JSONObject(response.getGraphObject().getInnerJSONObject().toString());
jArray = jsonObject.getJSONArray("data");
for (int i = 0; i < jArray.length(); i++) {
JSONObject element = null;
element = jArray.getJSONObject(i);
imageURL = new URL("http://graph.facebook.com/"+ element.get("id") +"/picture?type=large");
names.add(element.getString("name").toString());
Thread thread = new Thread(new Runnable() {
#Override
public void run() {
// TODO Auto-generated method stub
try {
bitmaps.add(BitmapFactory.decodeStream(imageURL.openConnection().getInputStream()));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
thread.start();
thread.join();
if (bitmaps.size() == jArray.length()) {
for (int j=0; j<jArray.length(); j++) {
RowItem item = new RowItem(bitmaps.get(j), names.get(j), descriptions[0]);
rowItems.add(item);
}
}
}
} catch (JSONException e) {
System.out.println("JSON EXCEPTION:"+ e);
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
RequestAsyncTask task = new RequestAsyncTask(request);
task.execute();
} else {
Log.d("close", " ");
}
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
Toast toast = Toast.makeText(getApplicationContext(),
"Item " + (position + 1) + ": " + rowItems.get(position),
Toast.LENGTH_SHORT);
toast.setGravity(Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 0);
toast.show();
}
}
Would appreciate it if someone could help spot a memory leak (if that is indeed the issue because i'm getting between 7 - 10% free) and advise whether there is a better way of implementing this? Thanks
EDIT: Just to clarify I'm updating the list by going back to the main activity to enter a new name in the edit text fields and clicking the button to start the list view again

Does scaling the images help any?
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 2;
I added in those two lines at line 67
public class ListViewActivity extends Activity implements OnItemClickListener {
public String firstname, secondname;
URL imageURL;
ArrayList<String> names = new ArrayList<String>();
ArrayList<Bitmap> bitmaps = new ArrayList<Bitmap>();
public static final String[] descriptions = new String[] {"Description"};
ListView listView;
List<RowItem> rowItems;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout);
loadData();
rowItems = new ArrayList<RowItem>();
listView = (ListView) findViewById(R.id.listview);
CustomListViewAdapter adapter = new CustomListViewAdapter(this,
R.layout.list_item, rowItems);
listView.setAdapter(adapter);
listView.setOnItemClickListener(this);
}
public void loadData() {
Session session = Session.getActiveSession();
firstname = getIntent().getExtras().getString("firstname");
secondname = getIntent().getExtras().getString("secondname");
if(session==null){
session = Session.openActiveSessionFromCache(this);
} else if (session.isOpened()) {
Bundle params = new Bundle();
params.putString("fields", "name, picture, url, id");
params.putString("limit", "10");
Request request = new Request(session, "search?q="+ firstname + "%20" + secondname + "&limit=10&type=user&fields=name,picture", params, HttpMethod.GET, new Request.Callback() {
#Override
public void onCompleted(Response response) {
// TODO Auto-generated method stub
JSONObject jsonObject = null;
JSONArray jArray = null;
imageURL = null;
try {
jsonObject = new JSONObject(response.getGraphObject().getInnerJSONObject().toString());
jArray = jsonObject.getJSONArray("data");
for (int i = 0; i < jArray.length(); i++) {
JSONObject element = null;
element = jArray.getJSONObject(i);
imageURL = new URL("http://graph.facebook.com/"+ element.get("id") +"/picture?type=large");
names.add(element.getString("name").toString());
Thread thread = new Thread(new Runnable() {
#Override
public void run() {
// TODO Auto-generated method stub
try {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 2;
bitmaps.add(BitmapFactory.decodeStream(imageURL.openConnection().getInputStream()));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
thread.start();
thread.join();
if (bitmaps.size() == jArray.length()) {
for (int j=0; j<jArray.length(); j++) {
RowItem item = new RowItem(bitmaps.get(j), names.get(j), descriptions[0]);
rowItems.add(item);
}
}
}
} catch (JSONException e) {
System.out.println("JSON EXCEPTION:"+ e);
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
RequestAsyncTask task = new RequestAsyncTask(request);
task.execute();
} else {
Log.d("close", " ");
}
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
Toast toast = Toast.makeText(getApplicationContext(),
"Item " + (position + 1) + ": " + rowItems.get(position),
Toast.LENGTH_SHORT);
toast.setGravity(Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 0);
toast.show();
}
}

Displaying a string into a listview

I successfully parsed data from this website here. After writing a few codes, I get a string in which I would like to display into a ListView. Basically, I want to display the whole array from the website into a ListView.
DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams());
HttpPost httppost = new HttpPost("http://ec2-54-213-155-95.us-west-2.compute.amazonaws.com/notices.php");
// Depends on your web service
httppost.setHeader("Content-type", "application/json");
InputStream inputStream = null;
String result = null;
try {
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
inputStream = entity.getContent();
// json is UTF-8 by default
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
result = sb.toString();
} catch (Exception e) {
// Oops
}
finally {
try{if(inputStream != null)inputStream.close();}catch(Exception squish){}
}
try {
JSONObject jObject = new JSONObject(result);
JSONArray jsonArray = jObject.getJSONArray("notices");
for(int i = 0; i < jsonArray.length(); i++) {
String arrayString = jsonArray.getString(i);
Log.d("notices", arrayString);
ListView listView1 = (ListView) findViewById(R.id.listView1);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
I am thinking of using arrayAdapter but I am not to sure of how to use it!

First decide whether you want to store your data in ArrayList or the Database before showing it in ListView. For ArrayList to ListView you will need ArrayAdapter and from database to ListView you will need CursorAdapter.
In ArrayList if you only have only TextView then you can use Simple ArrayAdapter else if there are multiple TextViews or more components then go for Custom ArrayAdapter.

you can use SimpleArrayAdapter as follows :-
ArrayList<String> list = new ArrayList<String>();
for(int i = 0; i < jsonArray.length(); i++) {
String arrayString = jsonArray.getString(i);
Log.d("notices", arrayString);
list .add(arrayString);
}
// and after filling this array list you can set this adapter to you list as
ListView listView1 = (ListView) findViewById(R.id.listView1);
final StableArrayAdapter adapter = new StableArrayAdapter(this,
android.R.layout.simple_list_item_1, list);
listView1 .setAdapter(adapter)

If you want to show your data in listview then u can use following code:
private ArrayAdapter<String> mArrayAdapter;
ListView listView1 ;
// Initialize array adapter.
mArrayAdapter = new ArrayAdapter<String>(this, R.layout.array_layout);
listView1 = (ListView) findViewById(R.id.listView1);
// Rest of your code...
//
//
try {
JSONObject jObject = new JSONObject(result);
JSONArray jsonArray = jObject.getJSONArray("notices");
for(int i = 0; i < jsonArray.length(); i++) {
String arrayString = jsonArray.getString(i);
mArrayAdapter.add(arrayString) ;
Log.d("notices", arrayString);
}
listView1.setAdapter(mArrayAdapter);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
array_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="18sp"
android:padding="5dp"
/>

Try to add the data using ArrayList<String> and StableArrayAdapter as below:
ListView listView1 = (ListView) findViewById(R.id.listView1);
JSONObject jObject = new JSONObject(result);
JSONArray jsonArray = jObject.getJSONArray("notices");
final ArrayList<String> list = new ArrayList<String>();
for (int i = 0; i < jsonArray.length; ++i)
{
String arrayString = jsonArray.getString(i);
Log.d("notices", arrayString);
list.add(arrayString);
}
final StableArrayAdapter adapter = new StableArrayAdapter(this,
android.R.layout.simple_list_item_1, list);
listview1.setAdapter(adapter);
StableArrayAdapter class
private class StableArrayAdapter extends ArrayAdapter<String> {
HashMap<String, Integer> mIdMap = new HashMap<String, Integer>();
public StableArrayAdapter(Context context, int textViewResourceId,
List<String> objects) {
super(context, textViewResourceId, objects);
for (int i = 0; i < objects.size(); ++i) {
mIdMap.put(objects.get(i), i);
}
}
#Override
public long getItemId(int position) {
String item = getItem(position);
return mIdMap.get(item);
}
#Override
public boolean hasStableIds() {
return true;
}
}

You may have got the answer till now but still it may help others.
I did it this way and it works great.
I made an xml recco_list file with 4 text views in.
Declare these.
ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
ListView list;
Getting into array
for(int i = 0; i < RECCO_ARRAY.length(); i++) {
try {
JSONObject recco = RECCO_ARRAY.getJSONObject(i);
JSONObject program = recco.getJSONObject("program");
JSONObject outlet = recco.getJSONObject("outlet");
String normalized_weight = recco.getString("normalized_weight");
String distance = recco.getString("distance");
HashMap<String, String> map = new HashMap<String, String>();
String program_name = program.getString("name");
String outlet_basics = outlet.getString("basics");
String outlet_name = new JSONObject(outlet_basics).getString("name");
map.put("program_name", program_name);
map.put("outlet_name", outlet_name);
map.put("normalized_weight", normalized_weight);
map.put("distance", distance);
oslist.add(map);
list= (ListView) rootView.findViewById(R.id.recco_list);
ListAdapter adapter = new SimpleAdapter(getActivity(), oslist,
R.layout.recco_list_view, new String[] {"program_name","outlet_name", "normalized_weight", "distance"},
new int[]{R.id.program_name,R.id.outlet_name, R.id.normalized_weight, R.id.distance});
list.setAdapter(adapter);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

Getting: Error parsing data when i get response from JSON

im writing an app for a site which uses JSON API. Im trying to parse the JSON but i get:
Error parsing data org.json.JSONException: Value error of type
java.lang.String cannot be converted to JSONArray
This is due its a string, i've tried other methods but i can only get information from the first string, because each string has its own randomly generated "filename/id", you can take a look at the json output:
{"error":"","S8tf":{"infoToken":"wCfhXe","deleteToken":"gzHTfGcF","size":122484,"sha1":"8c4e2bbc0794d2bd4f901a36627e555c068a94e6","filename":"Screen_Shot_2013-07-02_at_3.52.23_PM.png"},"S29N":{"infoToken":"joRm6p","deleteToken":"IL5STLhq","size":129332,"sha1":"b4a03897121d0320b82059c36f7a10a8ef4c113d","filename":"Stockholmsyndromet.docx"}}
Im trying to get it to show both of the "objects" from the json string. How can i make a lopp for it to find all the items or simply make it list all the "objects" contained in the "error" identifier?
My Main Activity:
public class FilesActivity extends SherlockListActivity implements
OnClickListener {
private ProgressDialog mDialog;
ActionBar ABS;
TextView session;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dblist);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setTitle("Files");
TextView txt = (TextView)findViewById(R.id.nodata);
/**String s = "{menu:{\"1\":\"sql\", \"2\":\"android\", \"3\":\"mvc\"}}";
JSONObject jObject = null;
try {
jObject = new JSONObject(s);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
JSONObject menu = null;
try {
menu = jObject.getJSONObject("menu");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Map<String,String> map = new HashMap<String,String>();
Iterator<String> iter = menu.keys();
while(iter.hasNext()){
String key = (String)iter.next();
String value = null;
try {
value = menu.getString(key);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
map.put(key,value);
txt.setText(value);
} **/
JsonAsync asyncTask = new JsonAsync();
// Using an anonymous interface to listen for objects when task
// completes.
asyncTask.setJsonListener(new JsonListener() {
#Override
public void onObjectReturn(JSONObject object) {
handleJsonObject(object);
}
});
// Show progress loader while accessing network, and start async task.
mDialog = ProgressDialog.show(this, getSupportActionBar().getTitle(),
getString(R.string.loading), true);
asyncTask.execute("http://api.bayfiles.net/v1/account/files?session=" + PreferenceManager.getDefaultSharedPreferences(getBaseContext()).getString("sessionID", "defaultStringIfNothingFound"));
//session = (TextView)findViewById(R.id.textView1);
//session.setText(PreferenceManager.getDefaultSharedPreferences(getBaseContext()).getString("sessionID", "defaultStringIfNothingFound"));
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
private void handleJsonObject(JSONObject object) {
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
String files = null;
try {
int id;
String name;
JSONArray array = new JSONArray("error");
for (int i = 0; i < array.length(); i++) {
JSONObject row = array.getJSONObject(i);
id = row.getInt("id");
name = row.getString("name");
}
//JSONArray shows = object.getJSONArray("");
/*String shows = object.getString("S*");
for (int i = 0; i < shows.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
//JSONObject e = shows.getJSONObject(i);
files = shows;
//map.put("video_location", "" + e.getString("video_location"));
//TextView txt = (TextView)findViewById(R.id.nodata);
//txt.setText(files);
mylist.add(map); *
}*/
} catch (JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
ListAdapter adapter = new SimpleAdapter(this, mylist, R.layout.dbitems,
new String[] { files, "video_location" }, new int[] { R.id.item_title,
R.id.item_subtitle });
setListAdapter(adapter);
final ListView lv = getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
#SuppressWarnings("unchecked")
HashMap<String, String> o = (HashMap<String, String>) lv
.getItemAtPosition(position);
//Intent myIntent = new Intent(ListShowsController.this,
// TestVideoController.class);
//myIntent.putExtra("video_title", o.get("video_title"));
//myIntent.putExtra("video_channel", o.get("video_channel"));
//myIntent.putExtra("video_location", o.get("video_location"));
//startActivity(myIntent);
}
});
if (mDialog != null && mDialog.isShowing()) {
mDialog.dismiss();
}
}
}
Any help is much appreciated!

You're trying to get the error field as a JSONArray. Its a string. You can't process a string as an array, it throws that exception. In fact, I don't see any arrays in there at all.

I would look into using a JSon library like Gson (https://code.google.com/p/google-gson/). You are able to deserialize collections, which is much easier than doing it yourself.

I can't retrieve data using JSON parsing

{
"user": {
"name": ["bineesh", "Administrator", "binu", "binu", "bijith", "prem"]
},
"email": ["bineesh256#gmail.com", "erpadmin#gmail.com", "binu245#gmail.com", "binu245#gmail.com", "bijith256#gmail.com", "toast#gmail.com"],
"phone": ["7293553814", "12345", "0", "0", "0", "9046567239"]
}
I can't parse this response:
Object(result);
// JSONObject jObject;
// jObject= new JSONObject(result);
JSONArray ja = new JSONArray(result);
for (int i = 0; i < ja.length(); i++) {
JSONObject jo = (JSONObject) ja.get(i);
System.out.println(jo.getString("name"));
}
How can I see this response in listview?

Sample code:
public class HomeActivity extends ListActivity {
/** Called when the activity is first created. */
#SuppressWarnings({ "rawtypes", "unchecked" })
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setListAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1, this.fetchTwitterPublicTimeline()));
}
public ArrayList<String> fetchTwitterPublicTimeline()
{
ArrayList<String> listItems = new ArrayList<String>();
try {
URL twitter = new URL(
"http://twitter.com/statuses/public_timeline.json");
URLConnection tc = twitter.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(
tc.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
JSONArray ja = new JSONArray(line);
for (int i = 0; i < ja.length(); i++) {
JSONObject jo = (JSONObject) ja.get(i);
listItems.add(jo.getString("text"));
}
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return listItems;
}
}

sample code :
public void parse(String s){
try {
JSONObject jsonObject = new JSONObject(s);
JSONObject namejObj = jsonObject.getJSONObject("user");
JSONArray nameArray = namejObj.getJSONArray("name");
for(int i =0;i<nameArray.length();i++){
Log.i("System out","name : "+nameArray.getString(i).toString());
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

You can use below method to parse JSON file
JSONObject obj = new JSONObject(result);
JSONObject objUser = obj.getJSONObject("user");
JSONArray arrUser = objUser.getJSONArray("name");
for(int i=0;i<arrUser.length();i++)
{
String name = arrUser.getString(i);
}
JSONArray arrEmail = objUser.getJSONArray("email");
for(int i=0;i<arrEmail.length();i++)
{
String email = arrEmail.getString(i);
}
JSONArray arrPhone = objUser.getJSONArray("phone");
for(int i=0;i<arrPhone.length();i++)
{
String phone = arrPhone.getString(i);
}