Develop Reference

ListView not showing JSON data

My listview is suposed to import json data into the listview, but it doesnt.
Here is my rooster.xml file:
<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" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context="com.nijdeken.ccapp.rooster">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Les"
android:id="#+id/lesson"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Lokaal"
android:id="#+id/room"
android:layout_above="#android:id/list"
android:layout_toLeftOf="#+id/teacher"
android:layout_toStartOf="#+id/teacher"
android:layout_marginRight="57dp"
android:layout_marginEnd="57dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Docent"
android:id="#+id/teacher"
android:layout_above="#android:id/list"
android:layout_toLeftOf="#+id/start"
android:layout_toStartOf="#+id/start"
android:layout_marginRight="92dp"
android:layout_marginEnd="92dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Tijd"
android:id="#+id/start"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="sans-serif-thin"
android:id="#android:id/list"
android:layout_below="#+id/lesson"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</RelativeLayout>
And my Rooster.java file:
public class rooster extends ListActivity {
private ProgressDialog pDialog;
// URL to get contacts JSON
private static String url = "http://api.ccapp.it/v2/zportal/schedule/37?token=df679ovlka5urmajmd7tg28lc0";
String apiUrl = "http://api.ccapp.it";
// JSON Node names
private static final String TAG_TIME = "start";
private static final String TAG_ROOM = "locations";
private static final String TAG_TEACHER = "teachers";
private static final String TAG_LESSON = "subjects";
// contacts JSONArray
JSONArray contacts = null;
// Hashmap for ListView
ArrayList<HashMap<String, String>> contactList;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_rooste);
// ListView listView = (ListView) findViewById(android.R.id.list);
// FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
// fab.attachToListView(listView);
contactList = 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 name = ((TextView) view.findViewById(R.id.lesson))
.getText().toString();
String cost = ((TextView) view.findViewById(R.id.room))
.getText().toString();
String description = ((TextView) view.findViewById(R.id.teacher))
.getText().toString();
// Starting single contact activity
// Intent in = new Intent(getApplicationContext(),
// SingleContactActivity.class);
// in.putExtra(TAG_NAME, name);
// in.putExtra(TAG_EMAIL, cost);
// in.putExtra(TAG_PHONE_MOBILE, description);
// startActivity(in);
}
});
// Calling async task to get json
new GetContacts().execute();
}
/**
* Async task class to get json by making HTTP call
* */
private class GetContacts extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
}
#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("Schedule: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
contacts = jsonObj.getJSONArray("");
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
String subject = c.getString(TAG_LESSON);
String teachers = c.getString(TAG_TEACHER);
String location = c.getString(TAG_ROOM);
String start = c.getString(TAG_TIME);
// tmp hashmap for single contact
HashMap<String, String> contact = new HashMap<String, String>();
// adding each child node to HashMap key => value
contact.put(TAG_LESSON, subject);
contact.put(TAG_TEACHER, teachers);
contact.put(TAG_ROOM, location);
contact.put(TAG_TIME, start);
// adding contact to contact list
contactList.add(contact);
}
} 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);
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
rooster.this, contactList,
R.layout.list_item, new String[] { TAG_LESSON, TAG_ROOM,
TAG_TEACHER, TAG_TIME }, new int[] { R.id.lesson,
R.id.room, R.id.teacher, R.id.time });
setListAdapter(adapter);
}
}
public static void getRooster(String appcode, int week){
// url="http://api.ccapp.it/v2/zportal/schedule/"+week+"?token="+appcode;
url="http://nijdeken.com/json/schedule.json";
}
}

Your JSON url is giving null output. I tried in browser then i got the value as empty []....
Please give the input to your JSON.
http://api.ccapp.it/v2/zportal/schedule/37?token=df679ovlka5urmajmd7tg28lc0

Android clickable listview

I have a android code which that get some data in json format from php file,
I successfully created a listview using those json now I want to create a second activity to show product details when I click on those items.
Here is the code :
public class MainActivity extends Activity {
private String jsonResult;
private String url = "xxxx/get_all_products.php";
private ListView listView;
private static final String TAG_PRODUCTS = "products";
private static final String TAG_PID = "pid";
private static final String TAG_NAME = "name";
private static final String TAG_PRICE = "price";
private static final String TAG_FOUND = "found";
private static final String TAG_DESCRIPTION = "description";
ArrayList<HashMap<String, String>> productList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView1);
productList = new ArrayList<HashMap<String, String>>();
accessWebService();
}
// Async Task to access the web
private class JsonReadTask extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... params) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(params[0]);
try {
HttpResponse response = httpclient.execute(httppost);
jsonResult = inputStreamToString(
response.getEntity().getContent()).toString();
}
catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
private StringBuilder inputStreamToString(InputStream is) {
String rLine = "";
StringBuilder answer = new StringBuilder();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
try {
while ((rLine = rd.readLine()) != null) {
answer.append(rLine);
}
}
catch (IOException e) {
// e.printStackTrace();
Toast.makeText(getApplicationContext(),
"Error..." + e.toString(), Toast.LENGTH_LONG).show();
}
return answer;
}
#Override
protected void onPostExecute(String result) {
ListDrwaer();
}
}// end async task
public void accessWebService() {
JsonReadTask task = new JsonReadTask();
// passes values for the urls string array
task.execute(new String[]{url});
}
// build hash set for list view
public void ListDrwaer() {
List<Map<String, String>> productList = new ArrayList<Map<String, String>>();
try {
JSONObject jsonResponse = new JSONObject(jsonResult);
JSONArray jsonMainNode = jsonResponse.optJSONArray("products");
for (int i = 0; i < jsonMainNode.length(); i++) {
JSONObject jsonChildNode = jsonMainNode.getJSONObject(i);
String name = jsonChildNode.optString("name");
String price = jsonChildNode.optString("price");
String found = jsonChildNode.optString("found");
// String outPut = name + "-" + number;
// String outPut = name + "-" + price + "-" + found;
// productList.add(createProduct("products", outPut));
HashMap<String, String> product = new HashMap<String, String>();
product.put(TAG_NAME, name);
product.put(TAG_FOUND, found);
product.put(TAG_PRICE, price);
productList.add(product);
}
} catch (JSONException e) {
Toast.makeText(getApplicationContext(), "Error" + e.toString(),
Toast.LENGTH_SHORT).show();
}
SimpleAdapter simpleAdapter = new SimpleAdapter(this, productList,
R.layout.list_item, new String[] { TAG_NAME, TAG_PRICE,
TAG_FOUND }, new int[] { R.id.name,
R.id.price, R.id.found });
listView.setAdapter(simpleAdapter);
}
}
and also there are there are two xml layout files.
I read many examples for doing this about setOnItemClickListener whit no success.....
for example tried this with no success :
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String selval = ((TextView) view).getText().toString();
Intent intnt = new Intent(getApplicationContext(), SingleListItem.class);
intnt.putExtra("selval ", selval);
}
Here are the errors :
FATAL EXCEPTION: main
java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.TextView
at sig.example.com.sig00.MainActivity$1.onItemClick(MainActivity.java:59)
Here are xml files :
<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"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<!-- Name Label -->
<!-- android:id="#+id/listView1" -->
<ListView
android:id="#+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="14dp">
</ListView>
and the list_item.xml is
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="10dp"
android:paddingLeft="10dp"
android:paddingRight="10dp" >
<!-- Name Label -->
<TextView
android:id="#+id/name"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingBottom="2dip"
android:paddingTop="6dip"
android:textColor="#43bd00"
android:textSize="16sp"
android:textStyle="bold"
android:gravity="center"/>
<!-- Email label -->
<TextView
android:id="#+id/price"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingBottom="2dip"
android:textColor="#acacac" />
<!-- Mobile number label -->
<TextView
android:id="#+id/found"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="left"
android:textColor="#5d5d5d"
android:textStyle="bold" />
</LinearLayout>

Replace your code from your setOnItemClickListener() to this one :
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String selval = listview.getItemAtPosition(position).getText().toString();
// Also I've found a solution on SO that a guy solved this problem doing soemthing like this :
// TextView txt = (TextView) parent.getChildAt(position - listview.firstVisiblePosition()).findViewById(R.id.sometextview);
// String keyword = txt.getText().toString();
Intent intnt = new Intent(getApplicationContext(), SingleListItem.class);
intnt.putExtra("selval ", selval);
EDIT
Your error is that in your intent you are putting as extra "selval ", with an BLANK SPACE so if in your next activity you are doing this :
Class SingleListItem extends Activity{
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.productdetails);
TextView txtProduct = (TextView) findViewById(R.id.product_label);
Intent i = getIntent(); // getting attached intent data
String selval = i.getStringExtra("selval"); // displaying selected product name txtProduct.setText(selval);
}
It never will return your selval string cause you are asking for "sevlal" not from "selval ".
Just remove your unnecessary space and it will work :)

The View in onItemClick is not a TextView, it's the entire row. You should do the following
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
//String selval = ((TextView) view.findViewById(R.id.yourId)).getText().toString();
HashMap<String, String> item = parent.getItemAtPosition(position);
String selval = item.get(TAG_PRICE);
Intent intnt = new Intent(getApplicationContext(), SingleListItem.class);
intnt.putExtra("selval ", selval);
}

How to set image like background in listview if image is must be loaded from url which parsed from JSON?

I've got a program which parses JSON file from server and makes a listview of it's objects. I need to create background image (or even a thumbnail near title) for each element of list and this image must be downloaded from url.
private static String url = "my url here";
private static final String TAG_NAME = "name";
private static final String TAG_AUTHOR = "author";
private static final String TAG_POSTS = "posts";
private static final String TAG_ID = "id";
private static final String TAG_TITLE = "title";
private static final String TAG_DATE = "date";
private static final String TAG_CONTENT = "content";
private static final String TAG_THUMBNAIL_URL = "thumbnail";
JSONArray posts = null;
ArrayList<HashMap<String, String>> postList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
postList = 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) {
String c_id = ((TextView)view.findViewById(R.id.id)).getText().toString();
String c_title = ((TextView)view.findViewById(R.id.title)).getText().toString();
String c_date = ((TextView)view.findViewById(R.id.date)).getText().toString();
String c_content = ((TextView)view.findViewById(R.id.content)).getText().toString();
String a_name = ((TextView)view.findViewById(R.id.name)).getText().toString();
ImageView image = (ImageView) findViewById(R.id.thumb);
Intent in = new Intent(getApplicationContext(), SimplePostActivity.class);
in.putExtra(TAG_AUTHOR, a_name);
in.putExtra(TAG_ID, c_id);
in.putExtra(TAG_TITLE, c_title);
in.putExtra(TAG_DATE, c_date);
in.putExtra(TAG_CONTENT, c_content);
startActivity(in);
Bitmap bMap = BitmapFactory.decodeFile("/sdcard/" + c_id + ".jpeg");
image.setImageBitmap(bMap);
}
});
new GetData().execute();
}
public class GetData extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Please wait...");
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
Parser parser = new Parser();
String jsonStr = parser.makeServiceCall(url, Parser.GET);
Log.d("Response: ", "> " +jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
posts = jsonObj.getJSONArray(TAG_POSTS);
for (int i = 0; i < posts.length(); i++) {
JSONObject num = posts.getJSONObject(i);
String id = num.getString(TAG_ID);
String title = num.getString(TAG_TITLE);
String date = num.getString(TAG_DATE);
String content = num.getString(TAG_CONTENT);
JSONObject author_object = num.getJSONObject(TAG_AUTHOR);
String name = author_object.getString(TAG_NAME);
HashMap<String, String> post = new HashMap<String, String>();
post.put(TAG_NAME, name);
post.put(TAG_ID, id);
post.put(TAG_TITLE, title);
post.put(TAG_DATE, date);
post.put(TAG_CONTENT, content);
postList.add(post);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("Parser", "Couldn't get any data from the url");
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if(pDialog.isShowing())
pDialog.dismiss();
ListAdapter adapter = new SimpleAdapter(MainActivity.this, postList, R.layout.list_item,
new String[] {TAG_NAME, TAG_ID, TAG_DATE, TAG_TITLE, TAG_CONTENT},
new int[] {R.id.name, R.id.id, R.id.title, R.id.date, R.id.content});
setListAdapter(adapter);
}
}
Can somebody tell me how to do that ? I don't even know how to start...
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="10dp"
android:paddingLeft="10dp"
android:paddingRight="10dp">
<TextView
android:id="#+id/title"
android:textColor="#0fffff"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<TextView
android:id="#+id/id"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:visibility="gone"/>
<TextView
android:id="#+id/date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="#+id/content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone" />
<TextView
android:id="#+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/></RelativeLayout>

You must:
Add an ImageView to your layout.
In order to display images you'll have to implement your own listview adapter and invoke images loading in getView method.
Use Picasso library to background download. It's use is as simple as:
Picasso.with(context).load("http://i.imgur.com/DvpvklR.png").into(imageView);

Data not being passed from listview into activity

I have finally got my onListItemClick to work but now it seems as if the data I have set to be passed into the next activity does not go through but the activity still starts. My application doesn't crash or anything it just loads the activity but the data I had set to go with it doesn't seem to be there. I have tried removing the scrollview but the data still doesn't seem to go through.
public class ListView extends ListActivity {
ArrayList<HashMap<String, String>> questionList;
final String TAG_RESULTS = "results";
final String TAG_QUESTION_SUBJECT = "Subject";
final String TAG_QUESTION_NUMANSWERS = "NumAnswers";
final String TAG_QUESTION = "question";
final String TAG_QUESTION_CONTENT = "Content";
final String TAG_QUESTION_CHOSENANSWER = "ChosenAnswer";
final String TAG_ANSWERS = "Answers";
final String TAG_ANSWER = "Answer";
final String TAG_ANSWERS_CONTENT = "content";
final String TAG_QUERY = "query";
JSONArray question = null;
android.widget.ListView lv;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.listview);
questionList = new ArrayList<HashMap<String, String>>();
new LoadAllData().execute();
}
#Override
protected void onListItemClick(android.widget.ListView l, View v, int pos, long id) {
super.onListItemClick(l, v, pos, id);
String Subject = ((TextView) v.findViewById(R.id.Subject)).getText().toString();
String Content = ((TextView) v.findViewById(R.id.Content)).getText().toString();
String ChosenAnswer = ((TextView) v.findViewById(R.id.ChosenAnswer)).getText().toString();
Intent i = new Intent(ListView.this, SingleListItem.class);
i.putExtra(TAG_QUESTION_SUBJECT, Subject);
i.putExtra(TAG_QUESTION_CONTENT, Content);
i.putExtra(TAG_QUESTION_CHOSENANSWER, ChosenAnswer);
startActivity(i);
}
class LoadAllData extends AsyncTask<String, String, String> {
private Dialog pDialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
ProgressDialog pDialog;
pDialog = new ProgressDialog(ListView.this);
pDialog.setMessage("Loading Data. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
if (pDialog != null && pDialog.isShowing()) pDialog.dismiss();
}
protected String doInBackground(String... args) {
try {
Intent in = getIntent();
String searchTerm = in.getStringExtra("TAG_SEARCH");
String query = URLEncoder.encode(searchTerm, "utf-8");
String URL = "http://example.com";
JSONParsser jParser = new JSONParsser();
JSONObject json = jParser.readJSONFeed(URL);
try {
//question = json.getJSONArray(TAG_QUESTION);
JSONArray questions = json.getJSONObject("all").getJSONArray("questions");
for(int i = 0; i < questions.length(); i++) {
JSONObject question = questions.getJSONObject(i);
String Subject = question.getString(TAG_QUESTION_SUBJECT);
String NumAnswers = question.getString(TAG_QUESTION_NUMANSWERS);
String ChosenAnswer = question.getString(TAG_QUESTION_CHOSENANSWER);
String Content = question.getString(TAG_QUESTION_CONTENT);
//JSONArray Answers = question.getJSONObject(TAG_ANSWERS).getJSONArray(TAG_ANSWER);
//JSONObject Answer = Answers.getJSONObject(0);
//String Content = Answer.getString(TAG_ANSWERS_CONTENT);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_QUESTION_SUBJECT, Subject);
map.put(TAG_QUESTION_NUMANSWERS, NumAnswers);
map.put(TAG_QUESTION_CONTENT, Content);
map.put(TAG_QUESTION_CHOSENANSWER, ChosenAnswer);
questionList.add(map);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return TAG_QUESTION ;
}
#Override
protected void onPostExecute(String file_URL) {
ListAdapter adapter = new SimpleAdapter(getBaseContext(), questionList,
R.layout.listelements,
new String[] { TAG_QUESTION_SUBJECT, TAG_QUESTION_NUMANSWERS }, new int[] {
R.id.Subject, R.id.NumAnswers });
setListAdapter(adapter);
}}}
SingleListItem Activity:
public class SingleListItem extends Activity {
TextView title;
TextView question;
TextView bestanswer;
TextView subject;
TextView content;
TextView chosenanswer;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.singlelistitem);
title = (TextView) findViewById(R.id.Title1);
question = (TextView) findViewById(R.id.Question1);
bestanswer = (TextView) findViewById(R.id.BestAnswer1);
subject = (TextView) findViewById(R.id.Subject1);
content = (TextView) findViewById(R.id.Content1);
chosenanswer = (TextView) findViewById(R.id.ChosenAnswer1);
Intent i = getIntent();
String Subject = i.getStringExtra("TAG_QUESTION_SUBJECT");
String Content = i.getStringExtra("TAG_QUESTION_CONTENT");
String ChosenAnswer = i.getStringExtra("TAG_QUESTION_CHOSENANSWER");
subject.setText(Subject);
content.setText(Content);
chosenanswer.setText(ChosenAnswer);
}
}
singlelistitem.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/Title1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Title:"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="#+id/Subject1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.00"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="#+id/Question1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Question:"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="#+id/Content1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.01"
android:textAppearance="?android:attr/textAppearanceSmall" />
<ScrollView
android:id="#+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ScrollView>
<TextView
android:id="#+id/BestAnswer1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Best Answer:"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="#+id/ChosenAnswer1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.01"
android:textAppearance="?android:attr/textAppearanceSmall" />
</LinearLayout>

Your keys are not the same.
You have this
i.putExtra(TAG_QUESTION_SUBJECT, Subject);
and TAG_QUESTION_SUBJECT is "Subject"
final String TAG_QUESTION_SUBJECT = "Subject";
Your get part is
String Subject = i.getStringExtra("TAG_QUESTION_SUBJECT"); // keys do not match
// must be "Subject"
Change it to below. Keys must match
String Subject = i.getStringExtra("Subject");
String Content = i.getStringExtra("Content");
String ChosenAnswer = i.getStringExtra("ChosenAnswer");

You should use the same keys for both sending and receiving. Some of the keys in your sending activity doesn't match with the keys in receiving activity.
For Sending:
map.put("Question", Subject);
map.put("NumAnswer", NumAnswers);
map.put("content", Content);
map.put("chosenAnswer", ChosenAnswer);
For Receiving:
String Subject = question.getString("Question");
String NumAnswers = question.getString("NumAnswer");
String ChosenAnswer = question.getString("chosenAnswer");
String Content = question.getString("content");

It looks like you've named the extras, e.g., "Subject" in your listview activity, then reference them differently in the single item activity:
String Subject = i.getStringExtra("TAG_QUESTION_SUBJECT");
Might look into that.

Change image dynamically into a ListView from JSON

I have the following code retrivieng data from URL in JSON format and updating a ListView. The code is working perfectly. In the xml layout, i have two TextView and one ImageView.
How can I update the ImageView dinamically?
I'm not getting the images from a URL, my images are stored inside my project (res/drawable folder). The var TAG_ICON has the name of my image which is exact the same name of the image inside my project.
Example:
response from JSON: TAG_ICON = lamp01
name of the image: lamp01.png
This is my main Class:
public class DeviceList extends ListActivity {
private static String url = "http://192.168.10.2/myhome/get_all_devices.php";
// Hashmap ListView
ArrayList<HashMap<String, String>> deviceList = new ArrayList<HashMap<String, String>>();
// class JSON
JSONParser jParser = new JSONParser();
// Criar JSON Nodes
private static final String TAG_DEVICES = "devices";
private static final String TAG_ID = "id";
private static final String TAG_NAME = "name";
private static final String TAG_DESCRIPTION = "description";
private static final String TAG_ICON = "icon";
// array JSONArray
JSONArray devices = null;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.device_list);
// Loat ListView
new LoadDevices().execute();
ListView lv = getListView();
}
// class LoadDevices
class LoadDevices extends AsyncTask<String, String, String>{
#Override
protected void onPreExecute(){
super.onPreExecute();
}
protected String doInBackground(String... args) {
// JSON string from URL
JSONObject json = jParser.getJSONFromUrl(url);
try {
// add to array
devices = json.getJSONArray(TAG_DEVICES);
// Looping trough all results
for(int i = 0; i < devices.length(); i++){
JSONObject c = devices.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_ID);
String name = c.getString(TAG_NAME);
String description = c.getString(TAG_DESCRIPTION);
String icon = c.getString(TAG_ICON);
// creating a HashMap
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_ID, id);
map.put(TAG_NAME, name);
map.put(TAG_DESCRIPTION, description);
map.put(TAG_ICON, icon);
deviceList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url){
runOnUiThread(new Runnable() {
public void run() {
// update JSON ListView
ListAdapter adapter = new SimpleAdapter(DeviceList.this, deviceList,R.layout.device_row,
new String[]{
TAG_NAME,
TAG_DESCRIPTION,
},
new int[] {
R.id.device_row_TextViewName,
R.id.device_row_TextViewDescription,
});
// update listView
setListAdapter(adapter);
}
});
}
}
}
Here's my XML layout for a single row
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/device_row_RelativeLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#drawable/list_selector"
android:orientation="horizontal"
android:padding="5dip" >
<LinearLayout
android:id="#+id/device_row_LinearLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_marginRight="5dip"
android:padding="3dip" >
<ImageView
android:id="#+id/device_row_ImageViewIcon"
android:contentDescription="#string/app_name"
android:layout_width="60dip"
android:layout_height="60dip"
android:src="#drawable/lamp03" />
</LinearLayout>
<TextView
android:id="#+id/device_row_TextViewName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="#+id/device_row_RelativeLayout"
android:layout_marginTop="5dip"
android:layout_marginLeft="75dip"
android:layout_toRightOf="#+id/device_row_ImageViewIcon"
android:text="Lâmpada do Quarto"
android:textColor="#4169E1"
android:textSize="20dip"
android:textStyle="bold"
android:typeface="sans" />
<TextView
android:id="#+id/device_row_TextViewDescription"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/device_row_TextViewName"
android:layout_marginBottom="5dip"
android:layout_alignLeft="#+id/device_row_TextViewName"
android:paddingTop="1dip"
android:layout_marginRight="15dip"
android:layout_centerHorizontal="true"
android:text="Usado para controlar a lâmpada do quarto."
android:textColor="#343434"
android:textSize="13dip" />
</RelativeLayout>

If the images are in your drawable folder you need to first use the title to find the image in your drawable folder. Make sure that the title of the file is the same as the title tag you are returning from the server.
int imageId = getResources().getIdentifier("yourpackagename:drawable/" + TAG_TITLE, null, null);
Then just find the ImageView and set the image
ImageView picture = (ImageView)findViewById(R.id.device_row_ImageViewIcon);
picture.setImageResource(imageId);