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POAsynctask with webservices in android
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  1. POAsynctask with webservices in android
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    copied!<p>i need help.. i'm trying to call php webservices from my android client application ,and i couldn't call it from main thread coz the SDK is 15 ,and I search on the web and I found the solution for this problem is to use the Asynktask .. but it doesn't work with me i don't know why .. any help please ..Thank you </p> <pre><code>public class CustomWebConnection extends AsyncTask&lt;Void, Void, String&gt; { private final String uri = "http://localhost/mywebservices.php?op=GetAllRest"; private ArrayList&lt;NameValuePair&gt; mParams; private OnPostExecuteListener mPostExecuteListener = null; public static interface OnPostExecuteListener{ void onPostExecute(String result); } CustomWebConnection(ArrayList&lt;NameValuePair&gt; nameValuePairs, OnPostExecuteListener postExecuteListener) throws Exception { mParams = nameValuePairs; mPostExecuteListener = postExecuteListener; if (mPostExecuteListener == null) throw new Exception("Param cannot be null."); } @Override protected String doInBackground(Void... params) { JSONObject param=null; String result = null; HttpClient httpClient = new DefaultHttpClient(); HttpHost httpHost = new HttpHost("localhost",80); HttpPost httpPost = new HttpPost(uri); httpPost.addHeader("Content-Type", "application/json; charset=utf-8"); try { //HttpEntity bodyEntity = new StringEntity(param.toString(), "utf8"); //httpPost.setEntity(bodyEntity); HttpResponse response = httpClient.execute(httpPost); HttpEntity entity = response.getEntity(); if (entity != null) { InputStream instream = entity.getContent(); BufferedReader reader = new BufferedReader( new InputStreamReader(instream)); StringBuilder sb = new StringBuilder(); String line = null; while ((line = reader.readLine()) != null) sb.append(line + "\n"); result = sb.toString(); instream.close(); } } catch(Exception e) { e.printStackTrace(); } httpPost.abort(); return result ; } @Override protected void onPostExecute(String result) { if (mPostExecuteListener != null){ try { JSONObject json = new JSONObject(result); mPostExecuteListener.onPostExecute(result); } catch (JSONException e){ e.printStackTrace(); } } } </code></pre> <p>and it's throw this exception </p> <pre><code> 04-09 16:31:37.393: E/AndroidRuntime(2284): FATAL EXCEPTION: main 04-09 16:31:37.393: E/AndroidRuntime(2284): java.lang.NullPointerException 04-09 16:31:37.393: E/AndroidRuntime(2284): at org.json.JSONTokener.nextCleanInternal(JSONTokener.java:116) 04-09 16:31:37.393: E/AndroidRuntime(2284): at org.json.JSONTokener.nextValue(JSONTokener.java:94) 04-09 16:31:37.393: E/AndroidRuntime(2284): at org.json.JSONObject.&lt;init&gt;(JSONObject.java:154) 04-09 16:31:37.393: E/AndroidRuntime(2284): at org.json.JSONObject.&lt;init&gt;(JSONObject.java:171) 04-09 16:31:37.393: E/AndroidRuntime(2284): at com.vtab.CustomWebConnection.onPostExecute(CustomWebConnection.java:92) 04-09 16:31:37.393: E/AndroidRuntime(2284): at com.vtab.CustomWebConnection.onPostExecute(CustomWebConnection.java:1) 04-09 16:31:37.393: E/AndroidRuntime(2284): at android.os.AsyncTask.finish(AsyncTask.java:602) 04-09 16:31:37.393: E/AndroidRuntime(2284): at android.os.AsyncTask.access$600(AsyncTask.java:156) 04-09 16:31:37.393: E/AndroidRuntime(2284): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615) 04-09 16:31:37.393: E/AndroidRuntime(2284): at android.os.Handler.dispatchMessage(Handler.java:99) 04-09 16:31:37.393: E/AndroidRuntime(2284): at android.os.Looper.loop(Looper.java:137) 04-09 16:31:37.393: E/AndroidRuntime(2284): at android.app.ActivityThread.main(ActivityThread.java:4424) 04-09 16:31:37.393: E/AndroidRuntime(2284): at java.lang.reflect.Method.invokeNative(Native Method) 04-09 16:31:37.393: E/AndroidRuntime(2284): at java.lang.reflect.Method.invoke(Method.java:511) 04-09 16:31:37.393: E/AndroidRuntime(2284): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 04-09 16:31:37.393: E/AndroidRuntime(2284): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 04-09 16:31:37.393: E/AndroidRuntime(2284): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>the error at <code>HttpResponse response = httpClient.execute(httpPost);</code></p> <p>and this is the <strong>JSON response</strong> from the server </p> <pre><code>[{"rest_id":"1","rest_name":"Al Dabke","cuisine":"Lebanese","no_tables":"15","bg_img":"lebanon","rest_logo":"dabke"},{"rest_id":"4","rest_name":"MY KIND OF PLACE","cuisine":null,"no_tables":"10","bg_img":"kindofplacebg","rest_logo":"mykindofplacelogo"},{"rest_id":"5","rest_name":"LANTANIA","cuisine":"Thai","no_tables":"10","bg_img":"lantaniabg","rest_logo":"lantanialogo"},{"rest_id":"6","rest_name":"LEONARDO","cuisine":"italian","no_tables":"10","bg_img":"leonardobg","rest_logo":"leonardologo"},{"rest_id":"7","rest_name":"LE MARCHE ","cuisine":"French","no_tables":"10","bg_img":"lemarchebg","rest_logo":"lemarchelogo"},{"rest_id":"8","rest_name":"Marias","cuisine":"mexican","no_tables":"10","bg_img":"mariang","rest_logo":"marialogo"},{"rest_id":"9","rest_name":"NOBLE HOUSE","cuisine":"chinese","no_tables":"10","bg_img":"noblehousebg","rest_logo":"noblehouselogo"}] </code></pre> <p>any help please </p>
 

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