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POArrayList of Hashmaps not showing in Android listview
 

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  1. POArrayList of Hashmaps not showing in Android listview
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    <p>I am trying to populate a listview with an arraylist of Hashmaps (String, Integer). I'm not getting have any errors however the list does not show anything. I have looked at other questions similar to this but in those cases they did not have any data in their arraylists. From the logcat i can see the list is present but the view isn't showing. Any idea how to resolve this?</p> <p>CODE :</p> <pre><code>public class JsonActivity extends ListActivity{ private ProgressDialog progressDialog; // JSON Node names private static final String TAG_ID = "id"; private static final String TAG_ARTISTNAME = "artistname"; // chartItemList is the array list that holds the chart items ArrayList&lt;HashMap&lt;String, Integer&gt;&gt; chartItemList = new ArrayList&lt;HashMap&lt;String, Integer&gt;&gt;(); JsonParser Parser = new JsonParser(); // JSONArray JSONArray chartItems = null; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.progressdialog); //url from where the JSON has to be retrieved String url = "http://web.com/test.php"; //Check if the user has a connection ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo info = cm.getActiveNetworkInfo(); if (info != null) { if (!info.isConnected()) { Toast.makeText(this, "Please check your connection and try again.", Toast.LENGTH_SHORT).show(); } //if positive, fetch the articles in background else new getChartItems().execute(url); } //else show toast else { Toast.makeText(this, "Please check your connection and try again.", Toast.LENGTH_SHORT).show(); } } class getChartItems extends AsyncTask&lt;String, String, String&gt; { // Shows a progress dialog while executing background task @Override protected void onPreExecute() { super.onPreExecute(); progressDialog = new ProgressDialog(JsonActivity.this); progressDialog.setMessage("Loading chart..."); progressDialog.setIndeterminate(false); progressDialog.setCancelable(false); progressDialog.show(); } //Gets the json data for chart items data and presents it in a list view @Override protected String doInBackground(String... args) { String url = "http://web.com/test.php"; String json = Parser.getJSONFromUrl(url); int id; String artistname; try{ chartItems = new JSONArray(json); JSONObject json_data=null; for(int i=0;i&lt;chartItems.length();i++){ json_data = chartItems.getJSONObject(i); artistname=json_data.getString("artistname"); id=json_data.getInt("id"); HashMap&lt;String, Integer&gt; hashMap = new HashMap&lt;String, Integer&gt;(); // adding each child node to HashMap key =&gt; value hashMap.put(artistname,id); // adding HashMap to ArrayList chartItemList.add(hashMap); } ; } catch (JSONException e) { e.printStackTrace(); } runOnUiThread(new Runnable() { public void run() { System.out.println(chartItemList); //updating list view with the parsed items ListAdapter adapter = new SimpleAdapter(JsonActivity.this, chartItemList, R.layout.listview, new String[] {TAG_ARTISTNAME,TAG_ID }, new int[] {R.id.artistname,R.id.id }); setListAdapter(adapter); } }); return null; } //Removes the progress dialog when the data has been fetched protected void onPostExecute(String args) { progressDialog.dismiss(); } } } </code></pre> <p>VIEW :</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal"&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" android:background="#eee"&gt; &lt;!-- Name Label --&gt; &lt;TextView android:id="@+id/id" android:layout_width="fill_parent" android:layout_height="wrap_content" android:textColor="#ff0a0a" android:textSize="16sp" android:textStyle="bold" android:paddingTop="6dip" android:paddingBottom="2dip" /&gt; &lt;TextView android:id="@+id/artistname" android:layout_width="fill_parent" android:layout_height="wrap_content" android:textColor="#000" android:textSize="10sp" android:paddingTop="6dip" android:paddingBottom="2dip" /&gt; &lt;/LinearLayout&gt; &lt;/LinearLayout&gt; </code></pre>
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    1. USAndroidEnthusiast
    1. USAndroidEnthusiast
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    1. CONot a solution, but why are you using `runOnUiThread()` then returning null when `onPostExecute()` already runs in the UI Thread? If you'd return the List instead of null in `doInBackground()`, you could use `onPostExecute()` like it's meant to be used.
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      1. USA--C
    2. CO@AndroidEnthusiast is you layout file name is `progressdialog` ?
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      1. POArrayList of Hashmaps not showing in Android listview
      1. USPratik Sharma
    3. CO@A--C : i agree with u, OP need to move UI related part inside onPostExecute from doInBackground
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      1. POArrayList of Hashmaps not showing in Android listview
      1. USρяσѕρєя K
 

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