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POListView not showing result from JSON
 

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  1. POListView not showing result from JSON
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    <p>I have been using <a href="http://www.androidhive.info/2012/05/how-to-connect-android-with-php-mysql/" rel="nofollow">this tutorial</a> to learn how JSON, PHP and MySQL works together. I've got it going pretty good becuase I can add rows to the database, and I can see from my LogCat that I also can display all rows from the database. The problem is that the ListView isn't showing anything at all. Just black.</p> <p>This is my all_products.xml:</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="fill_parent" android:orientation="vertical"&gt; &lt;!-- Main ListView Always give id value as list(@android:id/list) --&gt; &lt;ListView android:id="@android:id/list" android:layout_width="fill_parent" android:layout_height="wrap_content"/&gt; &lt;/LinearLayout&gt; </code></pre> <p>This is my list_item.xml:</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="vertical"&gt; &lt;!-- Product id (pid) - will be HIDDEN - used to pass to other activity --&gt; &lt;TextView android:id="@+id/pid" android:layout_width="fill_parent" android:layout_height="wrap_content" android:visibility="gone" /&gt; &lt;!-- Name Label --&gt; &lt;TextView android:id="@+id/name" android:layout_width="fill_parent" android:layout_height="wrap_content" android:paddingTop="6dp" android:paddingLeft="6dp" android:textSize="17sp" android:textStyle="bold"/&gt; &lt;/LinearLayout&gt; </code></pre> <p>This is my AllProductsActitivy.java:</p> <pre><code>public class AllProductsActivity extends ListActivity { // Progress Dialog private ProgressDialog pDialog; // Creating JSON Parser object JSONParser jParser = new JSONParser(); ArrayList&lt;HashMap&lt;String, String&gt;&gt; productsList; // url to get all products list private static String url_all_products = "http://81.xxx.xxx.xxx/get_all_products.php"; // JSON Node names private static final String TAG_SUCCESS = "success"; private static final String TAG_PRODUCTS = "products"; private static final String TAG_PID = "pid"; private static final String TAG_NAME = "name"; // products JSONArray JSONArray products = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.all_products); // Hashmap for ListView productsList = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;(); // Loading products in Background Thread new LoadAllProducts().execute(); // Get listview ListView lv = getListView(); // on seleting single product // launching Edit Product Screen lv.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position, long id) { // getting values from selected ListItem String pid = ((TextView) view.findViewById(R.id.pid)).getText() .toString(); // Starting new intent Intent in = new Intent(getApplicationContext(), EditProductActivity.class); // sending pid to next activity in.putExtra(TAG_PID, pid); // starting new activity and expecting some response back startActivityForResult(in, 100); } }); } // Response from Edit Product Activity @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); // if result code 100 if (resultCode == 100) { // if result code 100 is received // means user edited/deleted product // reload this screen again Intent intent = getIntent(); finish(); startActivity(intent); } } /** * Background Async Task to Load all product by making HTTP Request * */ class LoadAllProducts extends AsyncTask&lt;String, String, String&gt; { /** * Before starting background thread Show Progress Dialog * */ @Override protected void onPreExecute() { super.onPreExecute(); pDialog = new ProgressDialog(AllProductsActivity.this); pDialog.setMessage("Loading products. Please wait..."); pDialog.setIndeterminate(false); pDialog.setCancelable(false); pDialog.show(); } /** * getting All products from url * */ protected String doInBackground(String... args) { // Building Parameters List&lt;NameValuePair&gt; params = new ArrayList&lt;NameValuePair&gt;(); // getting JSON string from URL JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params); // Check your log cat for JSON reponse Log.d("All Products: ", json.toString()); try { // Checking for SUCCESS TAG int success = json.getInt(TAG_SUCCESS); if (success == 1) { // products found // Getting Array of Products products = json.getJSONArray(TAG_PRODUCTS); // looping through All Products for (int i = 0; i &lt; products.length(); i++) { JSONObject c = products.getJSONObject(i); // Storing each json item in variable String id = c.getString(TAG_PID); String name = c.getString(TAG_NAME); // creating new HashMap HashMap&lt;String, String&gt; map = new HashMap&lt;String, String&gt;(); // adding each child node to HashMap key =&gt; value map.put(TAG_PID, id); map.put(TAG_NAME, name); // adding HashList to ArrayList productsList.add(map); } } else { // no products found // Launch Add New product Activity Intent i = new Intent(getApplicationContext(), NewProductActivity.class); // Closing all previous activities i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(i); } } catch (JSONException e) { e.printStackTrace(); } return null; } /** * After completing background task Dismiss the progress dialog * **/ protected void onPostExecute(String file_url) { // dismiss the dialog after getting all products pDialog.dismiss(); // updating UI from Background Thread runOnUiThread(new Runnable() { public void run() { /** * Updating parsed JSON data into ListView * */ ListAdapter adapter = new SimpleAdapter( AllProductsActivity.this, productsList, R.layout.list_item, new String[] { TAG_PID, TAG_NAME}, new int[] { R.id.pid, R.id.name }); // updating listview setListAdapter(adapter); } }); } } } </code></pre> <p>I get this from the LogCat as well, not sure what it means:</p> <pre><code>10-10 17:09:00.235: W/System.err(20177): org.json.JSONException: No value for products 10-10 17:09:00.255: W/System.err(20177): at org.json.JSONObject.get(JSONObject.java:354) 10-10 17:09:00.255: W/System.err(20177): at org.json.JSONObject.getJSONArray(JSONObject.java:544) 10-10 17:09:00.255: W/System.err(20177): at com.sandtdevelopment.testjson.AllProductsActivity$LoadAllProducts.doInBackground(AllProduct sActivity.java:139) 10-10 17:09:00.255: W/System.err(20177): at com.sandtdevelopment.testjson.AllProductsActivity$LoadAllProducts.doInBackground(AllProduct sActivity.java:1) 10-10 17:09:00.255: W/System.err(20177): at android.os.AsyncTask$2.call(AsyncTask.java:287) 10-10 17:09:00.255: W/System.err(20177): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 10-10 17:09:00.255: W/System.err(20177): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 10-10 17:09:00.255: W/System.err(20177): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 10-10 17:09:00.255: W/System.err(20177): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 10-10 17:09:00.255: W/System.err(20177): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 10-10 17:09:00.260: W/System.err(20177): at java.lang.Thread.run(Thread.java:856) 10-10 17:09:00.570: E/SpannableStringBuilder(20177): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length 10-10 17:09:00.570: E/SpannableStringBuilder(20177): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length </code></pre> <p>I can't really figure out why it isn't working. As I said above, I can see that the JSON is working because it shows in the LogCat, but nothing is showing up.</p> <p>Something obvious for you guys?</p> <p>Thanks!</p>
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    1. COThe first line of your stack trace looks like its throwing an exception
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      1. USJohnny Z
    2. COOne thing to note, in your AsyncTask, you don't need to "runOnUiThread" in onPostExecute. onPreExecute and onPostExecute already run in the UI thread.
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