Develop Reference

Parse API Data into TextView

I have a API link that has a json element named title, and I am trying to store that value into a textview. Here is what I have so far in my main activity code that is supposed to display the contained string:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
JSONObject jObject;
try {
jObject = new JSONObject("https://chex-triplebyte.herokuapp.com/api/cats?page=0");
String mResponse = jObject.getString("title");
TextView t = (TextView) findViewById(R.id.title_image);
t.setText(mResponse);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
The API link I provided works so you can see the value title that I am trying to obtain.

try this:
TextView t = (TextView) findViewById(R.id.title_image);
try {
url = new URL("https://chex-triplebyte.herokuapp.com/api/cats?page=0");
urlConnection = (HttpURLConnection) url
.openConnection();
urlConnection.connect();
InputStream in = urlConnection.getInputStream();
reader = new BufferedReader(new InputStreamReader(in));
//InputStreamReader isw = new InputStreamReader(in);
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
String JsonResponse= buffer.toString();
JSONObject jsonobj = new JSONObject(JsonResponse);
JSONArray jarray = jsono.getJSONArray("jsontitle");
for (int i = 0; i < jarray.length(); i++) {
JSONObject object = jarray.getJSONObject(i);
t.setText(object.getString("title"));
}
} catch (JSONException e) {
e.printStackTrace();
}
but you have to make sure you have a correct json format like this:
{jsontitle:[{"title":"Space Keybaord Cat","timestamp":"2017-09-11T04:00:04Z","image_url":"https://triplebyte-cats.s3.amazonaws.com/space.jpg","description":"In space, no one can hear you purr."},{"title":"Jiji","timestamp":"2017-09-11T03:00:04Z","image_url":"https://triplebyte-cats.s3.amazonaws.com/jiji.png","description":"You'd think they'd never seen a girl and a cat on a broom before"},{"title":"Limecat","timestamp":"2017-09-11T02:00:04Z","image_url":"https://triplebyte-cats.s3.amazonaws.com/lime.jpg","description":"Destroyer of Clockspider and his evil followers, Limecat is the one true god."},{"title":"Astronaut Cat","timestamp":"2017-09-11T01:00:04Z","image_url":"https://triplebyte-cats.s3.amazonaws.com/astronaut.jpg","description":"Houston, we have a purroblem"},{"title":"Grumpy Cat","timestamp":"2017-09-11T00:00:04Z","image_url":"https://triplebyte-cats.s3.amazonaws.com/grumpy.jpg","description":"Queen of the RBF"},{"title":"Soviet cat","timestamp":"2017-09-10T23:00:04Z","image_url":"https://triplebyte-cats.s3.amazonaws.com/soviet.jpg","description":"In soviet Russia cat pets you!"},{"title":"Serious Business Cat","timestamp":"2017-09-10T22:00:04Z","image_url":"https://triplebyte-cats.s3.amazonaws.com/serious.jpg","description":"SRSLY GUISE"},{"title":"Sophisticated Cat","timestamp":"2017-09-10T21:00:04Z","image_url":"https://triplebyte-cats.s3.amazonaws.com/sophisticated.PNG","description":"I should buy a boat"},{"title":"Shironeko","timestamp":"2017-09-10T20:00:04Z","image_url":"https://triplebyte-cats.s3.amazonaws.com/shironeko.png","description":"The zen master kitty"},{"title":"Puss in Boots","timestamp":"2017-09-10T19:00:04Z","image_url":"https://triplebyte-cats.s3.amazonaws.com/puss.jpg","description":"Don't you dare do the litter box on me!"}]}

You need to make a network call first parse it to JSONArray first and then get the title from the JSON
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView t = (TextView) findViewById(R.id.title_image);
RequestQueue queue = Volley.newRequestQueue(this);
String url ="https://chex-triplebyte.herokuapp.com/api/cats?page=0";
// Request a string response from the provided URL.
StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
JSONArray jArray;
try {
jArray = new JSONArray(response);
JSONObject jObject = jArray.getJSONObject(0);
String mResponse = jObject.getString("title");
t.setText(mResponse);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
// Add the request to the RequestQueue.
queue.add(stringRequest);
}
But this will only show the first title in the response array
If you want to show all titles appended then you can loop over the array
JSONArray jArray;
try {
jArray = new JSONArray(response);
String mResponse = "";
for(int i=0 ;i<jArray.length();i++){
JSONObject jObject = jArray.getJSONObject(i);
mResponse += jObject.getString("title")+" ";
}
t.setText(mResponse);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
For using volley you need to include it in dependencies in build.gradle of app
dependencies {
.
.
compile 'com.android.volley:volley:1.0.0'
.
.
}

Try this...
MainActivity.java
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
private String TAG = MainActivity.class.getSimpleName();
private ListView listView;
List<RowItem> rowItems;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
rowItems = new ArrayList<RowItem>();
listView = (ListView) findViewById(R.id.item_list);
new GetList().execute();
}
#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();
}
class GetList extends AsyncTask<Void, Void, List<RowItem>> {
#Override
protected void onPreExecute() {
super.onPreExecute();
Toast.makeText(MainActivity.this, "Json Data is downloading", Toast.LENGTH_LONG).show();
}
#Override
protected List<RowItem> doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// Making a request to url and getting response
String url = "https://chex-triplebyte.herokuapp.com/api/cats?page=0";
String jsonStr = sh.makeServiceCall(url);
Log.e(TAG, "Response from url: " + jsonStr);
if (jsonStr != null) {
try {
JSONArray list = new JSONArray(jsonStr);
for (int i = 0; i < list.length(); i++) {
JSONObject c = list.getJSONObject(i);
String title = c.getString("title");
String timestamp = c.getString("timestamp");
String image_url = c.getString("image_url");
String description = c.getString("description");
RowItem item = new RowItem();
item.setTitle(title);
item.setTimestamp(timestamp);
item.setImageUrl(image_url);
item.setDescription(description);
rowItems.add(item);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
});
}
} else {
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG).show();
}
});
}
return rowItems;
}
#Override
protected void onPostExecute(List<RowItem> rowItems) {
super.onPostExecute(rowItems);
if (rowItems != null) {
CustomListViewAdapter adapter = new CustomListViewAdapter(MainActivity.this, R.layout.list_item, rowItems);
listView.setAdapter(adapter);
}
}
}
}
CustomListViewAdapter.java
public class CustomListViewAdapter extends ArrayAdapter<RowItem> {
private Context context;
public CustomListViewAdapter(Context context, int resourceId,
List<RowItem> items) {
super(context, resourceId, items);
this.context = context;
}
/*private view holder class*/
private class ViewHolder {
ImageView imageView;
TextView txtTitle;
TextView txtDesc;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
RowItem rowItem = getItem(position);
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list_item, null);
holder = new ViewHolder();
holder.txtDesc = (TextView) convertView.findViewById(R.id.description);
holder.txtTitle = (TextView) convertView.findViewById(R.id.title);
holder.imageView = (ImageView) convertView.findViewById(R.id.preview);
convertView.setTag(holder);
} else
holder = (ViewHolder) convertView.getTag();
holder.txtDesc.setText(rowItem.getDescription());
holder.txtTitle.setText(rowItem.getTitle());
String url = rowItem.getImageUrl();
DownloadImageTask downloadImageTask = new DownloadImageTask(holder.imageView);
downloadImageTask.execute(url);
return convertView;
}
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
ImageView bmImage;
public DownloadImageTask(ImageView bmImage) {
this.bmImage = bmImage;
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon11;
}
protected void onPostExecute(Bitmap result) {
bmImage.setImageBitmap(result);
}
}
}
RowItem.java
public class RowItem {
private String title;
private String timestamp;
private String imageUrl;
private String description;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getTimestamp() {
return timestamp;
}
public void setTimestamp(String timestamp) {
this.timestamp = timestamp;
}
public String getImageUrl() {
return imageUrl;
}
public void setImageUrl(String imageUrl) {
this.imageUrl = imageUrl;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/linearLayout2">
<ImageView
android:id="#+id/preview"
android:layout_width="80dp"
android:layout_height="80dp"
app:srcCompat="#mipmap/ic_launcher"
android:contentDescription="#string/app_name" />
<TextView
android:id="#+id/title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:text="#string/app_name"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/preview"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/description"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="#string/app_name"
app:layout_constraintBottom_toBottomOf="#+id/preview"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/preview"
app:layout_constraintTop_toBottomOf="#+id/title" />
</android.support.constraint.ConstraintLayout>
HttpHandler.java
public class HttpHandler {
private static final String TAG = HttpHandler.class.getSimpleName();
public HttpHandler() {
}
public String makeServiceCall(String reqUrl) {
String response = null;
try {
URL url = new URL(reqUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
// read the response
InputStream in = new BufferedInputStream(conn.getInputStream());
response = convertStreamToString(in);
} catch (MalformedURLException e) {
Log.e(TAG, "MalformedURLException: " + e.getMessage());
} catch (ProtocolException e) {
Log.e(TAG, "ProtocolException: " + e.getMessage());
} catch (IOException e) {
Log.e(TAG, "IOException: " + e.getMessage());
} catch (Exception e) {
Log.e(TAG, "Exception: " + e.getMessage());
}
return response;
}
private String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line;
try {
while ((line = reader.readLine()) != null) {
sb.append(line).append('\n');
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}
activity_list.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="#+id/item_list"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
Note:
item_list.xml has ConstraintLayout implementation.
Result:

setOnItemSelectedListener not being called?

I'm new to Android and was working on my first app. I was trying to parse the contents of a Google Sheets spreadsheets, specifically a list of names into a Spinner. I've done so successfully by using an ArrayAdapter with an ArrayList as I can see the options when I expand the Spinner. The problem I'm facing is that the Spinner doesn't show the currently selected item when one is selected. If you try to run my code, you'll see that if you try to click the submit Button, it'll tell you that null is being selected, so I've narrowed down my problem to the currently selected name String not being selected.
Here is my MainActivity class:
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
ArrayList<String> names = new ArrayList<String>();
Spinner spBusinessType;
Button btnsubmit;
ArrayAdapter<String> adapterBusinessType;
String sbusinesstype;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spBusinessType = (Spinner) findViewById(R.id.spBussinessType);
btnsubmit=(Button)findViewById(R.id.submit);
btnsubmit.setOnClickListener(this);
new DownloadWebpageTask(new AsyncResult() {
#Override
public void onResult(JSONObject object) {
processJson(object);
}
}).execute("https://spreadsheets.google.com/tq?key=1JKU2Vt_gMNUYYALct4m9xElLdpGlQ3N4uhS9qFRzxOQ");
adapterBusinessType = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, names);
adapterBusinessType.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spBusinessType.setAdapter(adapterBusinessType);
spBusinessType.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> adapter, View v,
int position, long id) {
// On selecting a spinner item
sbusinesstype = adapter.getItemAtPosition(position).toString();
System.out.println(sbusinesstype);
// Showing selected spinner item
Toast.makeText(getApplicationContext(),
"Bussiness Type : " + sbusinesstype, Toast.LENGTH_SHORT).show();
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
#Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "You have selected " + sbusinesstype,Toast.LENGTH_SHORT).show();
}
private void processJson(JSONObject object) {
try {
JSONArray rows = object.getJSONArray("rows");
for (int r = 0; r < rows.length(); ++r) {
JSONObject row = rows.getJSONObject(r);
JSONArray columns = row.getJSONArray("c");
String name = columns.getJSONObject(0).getString("v");
names.add(name);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
the AsyncResult interface I'm using to obtain a JSON object from Google Sheets:
public interface AsyncResult
{
void onResult(JSONObject object);
}
the DownloadWebpageTask class that is obtaining and parsing the JSON object:
public class DownloadWebpageTask extends AsyncTask<String, Void, String> {
AsyncResult callback;
public DownloadWebpageTask(AsyncResult callback) {
this.callback = callback;
}
#Override
protected String doInBackground(String... urls) {
// params comes from the execute() call: params[0] is the url.
try {
return downloadUrl(urls[0]);
} catch (IOException e) {
return "Unable to download the requested page.";
}
}
// onPostExecute displays the results of the AsyncTask.
#Override
protected void onPostExecute(String result) {
// remove the unnecessary parts from the response and construct a JSON
int start = result.indexOf("{", result.indexOf("{") + 1);
int end = result.lastIndexOf("}");
String jsonResponse = result.substring(start, end);
try {
JSONObject table = new JSONObject(jsonResponse);
callback.onResult(table);
} catch (JSONException e) {
e.printStackTrace();
}
}
private String downloadUrl(String urlString) throws IOException {
InputStream is = null;
try {
URL url = new URL(urlString);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("GET");
conn.setDoInput(true);
// Starts the query
conn.connect();
int responseCode = conn.getResponseCode();
is = conn.getInputStream();
String contentAsString = convertStreamToString(is);
return contentAsString;
} finally {
if (is != null) {
is.close();
}
}
}
private String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
the activity_main layout 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=".MainActivity">
<include layout="#layout/content_main" />
</RelativeLayout>
and the content_main layout file that I put the Spinner in:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context=".MainActivity">
tools:showIn="#layout/activity_main">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Select Business Type"
android:textColor="#000000"
android:textSize="20sp" />
<Spinner
android:id="#+id/spBussinessType"
style="#style/Base.Widget.AppCompat.Spinner.Underlined"
android:layout_width="match_parent"
android:layout_height="wrap_content"></Spinner>
<Button
android:id="#+id/submit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="10dp"
android:text="Submit"
android:textSize="15sp" />
</LinearLayout>
What is causing the adapter to not detect when one of the name strings is being selected? Could it be related to how I'm parsing them from the Google Sheet?

You didnt notify the ArrayAdapter that the data has changed, you originally passed empty Arraylist and upon filling the array list, you have to notifiy the Adapter that data has changed and its time for it to consider that, something like
private void processJson(JSONObject object) {
try {
JSONArray rows = object.getJSONArray("rows");
for (int r = 0; r < rows.length(); ++r) {
JSONObject row = rows.getJSONObject(r);
JSONArray columns = row.getJSONArray("c");
String name = columns.getJSONObject(0).getString("v");
names.add(name);
}
adapterBusinessType.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
That should help.

It would appear no data is being displayed in your Adapter. Nothing can be selected. Your listener code looks fine.
Put adapterBusinessType.notifyDatasetChanged() into the processJson method. Outside the catch or after you add all the data to the list.
Or... replace names.add with adapterBusinessType.add

Onpostexecute method is never used

I'm getting a "OnPostExecute method is never used" error and hence my dialog box never closes, not sure where my mistake is. I'm sure its a mistake with brackets somewhere but I've been trying to figure it out for a while and I can't, perhaps a fresh pair of eyes can help in this case.
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_all_bets);
name = (getIntent().getExtras().getString("user")).toLowerCase();
Log.d("name", name);
// Hashmap for ListView
bet = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
new LoadAllGames().execute();
}
/**
* Background Async Task to Load all product by making HTTP Request
*/
class LoadAllGames extends AsyncTask<String, String, String> {
private String id;
private String stake;
private String user;
private String returns;
private String teams;
private String status;
// *//**
// * Before starting background thread Show Progress Dialog
// *//*
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(DisplayAllBets.this);
pDialog.setMessage("Loading Games. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
// *//**
// * getting All products from url
// *//*
protected String doInBackground(String... args) {
// Building Parameters
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(url_all_games);
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("email", name));
try {
post.setEntity(new UrlEncodedFormEntity(params));
} catch (IOException ioe) {
ioe.printStackTrace();
}
try {
HttpResponse response = client.execute(post);
Log.d("Http Post Response:", response.toString());
HttpEntity httpEntity = response.getEntity();
InputStream is = httpEntity.getContent();
JSONObject jObj = null;
String json = "";
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
if (!line.startsWith("<", 0)) {
if (!line.startsWith("(", 0)) {
sb.append(line + "\n");
}
}
}
is.close();
json = sb.toString();
json = json.substring(json.indexOf('{'));
Log.d("sb", json);
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
Log.d("json", jObj.toString());
try {
allgames = jObj.getJSONArray(TAG_BET);
Log.d("allgames", allgames.toString());
// looping through All Products
for (int i = 0; i < allgames.length(); i++) {
JSONObject c = allgames.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_ID);
String user = c.getString(TAG_USER);
String returns = c.getString(TAG_RETURNS);
String stake = c.getString(TAG_STAKE);
String status = c.getString(TAG_STATUS);
String Teams = c.getString(TAG_TEAMS);
Log.d("id", id);
Log.d("user", user);
Log.d("returns", returns);
Log.d("stake", stake);
Log.d("status", status);
Log.d("teams", Teams);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_ID, id);
map.put(TAG_TEAMS, Teams);
map.put(TAG_USER, user);
map.put(TAG_RETURNS, returns);
map.put(TAG_STAKE, stake);
map.put(TAG_STATUS, status);
// adding HashList to ArrayList
bet.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
return "";
}
#Override
protected void onPostExecute() {
// dismiss the dialog after getting all products
// updating UI from Background Thread
pDialog.dismiss();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_display_all_bets, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

You defined your AsyncTask as,
class LoadAllGames extends AsyncTask<String, String, String>
For which, you should have an onPostExecute(String) type
#Override
protected void onPostExecute(String param) {
// dismiss the dialog after getting all products
// updating UI from Background Thread
pDialog.dismiss();
}
Should work.

I want to display values on textview through JSONParser using given url

I want to display about_builder of given JSON url, but I am not able to declare properly JSONObject and JSONArray on MainActivity, so please anyone help me to display the data on TextView.
Error shown:
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.example.and_ws_builder/com.example.and_ws_builder.MainActivity}:
android.os.NetworkOnMainThreadException
MainActivity.java class
public class MainActivity extends Activity {
private static String url ="http://myfourwalls.in/services_microsite/project_builder.php";
private static final String TAG_Name = "about_builder";
JSONArray builder = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
JSONParser jParser = new JSONParser();
JSONObject json = jParser.getJSONFormUrl(url);
try {
builder = json.getJSONArray(TAG_Name);
JSONObject c = builder.getJSONObject(0);
for (int i = 0; i < json.length(); i++) {
String name = c.getString(TAG_Name);
final TextView nam = (TextView) findViewById(R.id.txtname);
nam.setText(name);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
JSONParser.java
public class JSONParser {
static InputStream is = null;
static JSONObject jobj = null;
static String json = "";
public JSONParser() {
}
public JSONObject getJSONFormUrl(String url) {
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}catch (ClientProtocolException e) {
e.printStackTrace();
}catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null ){
sb.append(line +"\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error","Error converting result" + e.toString());
}
try {
jobj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parse","error Parsing data" + e.toString());
}
return jobj;
}
}
main_activity.xml
<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" >
<TextView
android:id="#+id/txtname"
android:layout_width="fill_parent"
android:layout_height="100dp"/>
</RelativeLayout>

You are using Network related code in main thread. Use AsyncTask.

You are calling network calls inside the main thread means foreground which is not supported in android.So use assynctask class which will handle network calls in background.
1)inside on create method call like:
new GetJson().execute();
2) declare the following outside oncreate
private class GetJson extends AsyncTask<String, Void, String> {
JSONObject c=null;
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected JSONObject doInBackground(String... params) {
JSONParser jParser = new JSONParser();
JSONObject json = jParser.getJSONFormUrl(url);
try {
builder = json.getJSONArray(TAG_Name);
c = builder.getJSONObject(0);
} catch (JSONException e) {
e.printStackTrace();
}
return c;
}
#Override
protected void onPostExecute(final JSONObject result) {
for (int i = 0; i < result.length(); i++) {
String name = result.getString(TAG_Name);
final TextView nam = (TextView) findViewById(R.id.txtname);
nam.setText(name);
}
}

Android GUI does not show up

I am currently making an app for android and I have a problem where the UI on a new activity that I start from the main one does not show up. I have no idea what the problem is.
Here is my second activity's layout xml file:
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/TableLayout1"
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="com.tabcards.android.Search" >
<TableRow
android:id="#+id/tableRow1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1" >
<ScrollView
android:id="#+id/scrollView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp"
>
<TableLayout
android:id="#+id/tableScrollView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:stretchColumns="yes"
android:padding="5dp"
android:background="#color/gray">
</TableLayout>
</ScrollView>
</TableRow>
Here is my acitiviy's code:
public class Search extends ActionBarActivity {
TableLayout tableScrollView;
String[] JSONExceptions = { "type", "em", "user_id", "id", "profilepic", "bg"};
String value;
JSONObject jObject;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
Bundle extras = getIntent().getExtras();
if (extras != null) {
value = extras.getString("id");
}
System.out.println(value);
tableScrollView = (TableLayout) findViewById(R.id.tableScrollView);
Thread thread = new Thread(new Runnable() {
#Override
public void run() {
try {
jObject = getJson("http://www.tabcards.com/req/androidapi/L2o30H8JlFMtFYHW3KLxkts20ztc5Be6Z6m6v315/json/"
+ value);
} catch (Exception e) {
e.printStackTrace();
}
}
});
thread.start();
try {
thread.join();
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
new Thread(new Runnable() {
#Override
public void run() {
try {
createUI(jObject);
} catch (JSONException e) {
e.printStackTrace();
}
}
});
System.out.println("complete");
}
private void createUI(JSONObject jObject) throws JSONException {
Iterator<?> keys = jObject.keys();
int absIndex = 0;
while( keys.hasNext() ){
String key = (String)keys.next();
if(!contains2(JSONExceptions , jObject.get(key))){
String value = jObject.getString(key);
System.out.println("level 1");
if(value!="") {
insertElement(key + " : " + value, absIndex++);
}
}
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.search, menu);
return true;
}
private void insertElement(String data, int i) {
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View newRow = inflater.inflate(R.layout.row, null, false);
newRow.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT));
TextView dataTextView = (TextView) newRow
.findViewById(R.id.rowTextView);
dataTextView.setText(data);
System.out.println(dataTextView.getText().toString());
tableScrollView.addView(newRow, i);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private InputStream downloadUrl(String urlString) throws IOException {
URL url = new URL(urlString);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("GET");
conn.setDoInput(true);
// Starts the query
conn.connect();
return conn.getInputStream();
}
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
public static JSONObject getJson(String url){
InputStream is = null;
String result = "";
JSONObject jsonObject = null;
// HTTP
try {
HttpClient httpclient = new DefaultHttpClient(); // for port 80 requests!
HttpPost httppost = new HttpPost(url);
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch(Exception e) {
return null;
}
// Read response to string
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf-8"),8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
System.out.println(line);
}
is.close();
result = sb.toString().replace("[", "");
} catch(Exception e) {
return null;
}
// Convert string to object
try {
jsonObject = new JSONObject(result.replace("]", ""));
} catch(JSONException e) {
return null;
}
return jsonObject;
}
This is how I am creating the activity:
Intent i = new Intent(getApplicationContext(), Search.class);
i.putExtra("id",searchEditText.getText().toString());
startActivity(i);
Tell me if you need any more info.

problem:
thread.join();
That problem is dreadlock you are waiting for thread to be done executing, which will put your UI thread to the Blocking state like Thread.Sleep() thus UI thread is waiting for your request to be done executing before it can display the layout in the screen.
from documentation:
Like sleep, join responds to an interrupt by exiting with an InterruptedException.
solution:
Use only one thread which will still wait for the request(createUI) and executes your createUI method after.
Thread thread = new Thread(new Runnable() {
#Override
public void run() {
try {
jObject = getJson("http://www.tabcards.com/req/androidapi/L2o30H8JlFMtFYHW3KLxkts20ztc5Be6Z6m6v315/json/"
+ value);
createUI(jObject);
} catch (Exception e) {
e.printStackTrace();
}
}
});
thread.start();