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POUpdate listview after adding new data into database in Android
 

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  1. POUpdate listview after adding new data into database in Android
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    <p>I want to make chat room Android App, am using JSON as webservices using PHP, MYSQL &amp; parsing it in my android app. Initially am able to see the data, but am not able to update the data in my app even after updating in my DB, I have to re-run the app to get the updated data. How do i resolve this. </p> <p>code:</p> <pre><code>package com.example.androidhive; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Timer; import org.apache.http.NameValuePair; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; //import com.mekya.R; import android.app.ListActivity; import android.app.ProgressDialog; import android.content.Intent; import android.os.AsyncTask; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.EditText; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.TextView; 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; all_chat; // url to get all products list private static String url_all_products = "http://url.com/chat-app/"; // JSON Node names private static final String TAG_CHAT = "chat"; private static final String TAG_FROM = "from_u"; private static final String TAG_MESSAGE = "message"; private static final String TAG_DATE = "date"; // products JSONArray JSONArray chat = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.all_products); // Hashmap for ListView all_chat = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;(); // Loading products in Background Thread new LoadAllProducts().execute(); } /** * 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 { // products found // Getting Array of Products chat = json.getJSONArray(TAG_CHAT); // looping through All Products for (int i = 0; i &lt; chat.length(); i++) { JSONObject c = chat.getJSONObject(i); // Storing each json item in variable String date = c.getString(TAG_DATE); String from = c.getString(TAG_FROM); String message = c.getString(TAG_MESSAGE); // 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_DATE, date); map.put(TAG_FROM, from); map.put(TAG_MESSAGE, message); // adding HashList to ArrayList all_chat.add(map); } } 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, all_chat, R.layout.list_item, new String[] { TAG_FROM,TAG_DATE, TAG_MESSAGE }, new int[] { R.id.from,R.id.date, R.id.message }); // updating listview setListAdapter(adapter); } }); } } } </code></pre>
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    1. USl3l4c7_h4t
    1. USl3l4c7_h4t
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    1. COadd here java code of your adapter
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      1. USSimon Dorociak
    2. COMr sajmon_d, i don't undrestand what is ur mean ... :( i have not java code adapter , what gon id do ?
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    3. COMr sajmon , I use defult listadapter. i used "import android.widget.ListAdapter;"
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      1. USl3l4c7_h4t
 

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