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POCall Async Task from Dialog Box
 

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    <p>I have a class in which a button is pressed it shows a dialog box. This box has two buttons YES,NO. When i click YES i want to call async task to update some values in DB. I tried this but it Gives me Looper.prepare() error. Searched all over SO and GOogle but no solution. Does any1 have any ideas? </p> <p>Thanx</p> <pre><code>bttnSync.setOnClickListener(new OnClickListener() { public void onClick(View v) { if (isOnline()) { AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder( MainPage.this); alertDialogBuilder.setTitle("Syncing all data....!!"); alertDialogBuilder .setMessage( "Are you sure you want to Sync all the data?") .setCancelable(false) .setPositiveButton("Yes", new DialogInterface.OnClickListener() { public void onClick( DialogInterface dialog, int id) { //call(); new CountDownTask().execute(); MainPage.this.finish(); Intent i = new Intent( "com.example.collegesoft.MainPage"); startActivity(i); } }) .setNegativeButton("No", new DialogInterface.OnClickListener() { public void onClick( DialogInterface dialog, int id) { dialog.cancel(); } }); AlertDialog alertDialog = alertDialogBuilder.create(); // show it alertDialog.show(); } else { AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder( MainPage.this); alertDialogBuilder.setTitle("No Internet Connection!!"); alertDialogBuilder .setMessage( "Device is not connected to the Internet or the connection is slow.") .setCancelable(false) .setNegativeButton("Cancel", new DialogInterface.OnClickListener() { public void onClick( DialogInterface dialog, int id) { dialog.cancel(); } }); AlertDialog alertDialog = alertDialogBuilder.create(); // show it alertDialog.show(); } } }); private class CountDownTask extends AsyncTask&lt;Void, Integer, Void&gt; { protected void onPreExecute() { progressDialog = ProgressDialog.show(MainPage.this, "Loading...", "Loading application , please wait...", false, false); } protected Void doInBackground(Void... params) { call(); return null; } protected void onProgressUpdate(Integer... values) { progressDialog.setProgress(values[0]); } protected void onPostExecute(Void result) { progressDialog.dismiss(); } } 01-31 10:41:37.575: E/AndroidRuntime(9038): FATAL EXCEPTION: AsyncTask #1 01-31 10:41:37.575: E/AndroidRuntime(9038): java.lang.RuntimeException: An error occured while executing doInBackground() 01-31 10:41:37.575: E/AndroidRuntime(9038): at android.os.AsyncTask$3.done(AsyncTask.java:278) 01-31 10:41:37.575: E/AndroidRuntime(9038): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 01-31 10:41:37.575: E/AndroidRuntime(9038): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 01-31 10:41:37.575: E/AndroidRuntime(9038): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 01-31 10:41:37.575: E/AndroidRuntime(9038): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 01-31 10:41:37.575: E/AndroidRuntime(9038): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 01-31 10:41:37.575: E/AndroidRuntime(9038): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 01-31 10:41:37.575: E/AndroidRuntime(9038): at java.lang.Thread.run(Thread.java:856) 01-31 10:41:37.575: E/AndroidRuntime(9038): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 01-31 10:41:37.575: E/AndroidRuntime(9038): at android.os.Handler.&lt;init&gt;(Handler.java:121) 01-31 10:41:37.575: E/AndroidRuntime(9038): at android.app.Activity.&lt;init&gt;(Activity.java:735) 01-31 10:41:37.575: E/AndroidRuntime(9038): at com.example.collegesoft.SyncData.&lt;init&gt;(SyncData.java:22) 01-31 10:41:37.575: E/AndroidRuntime(9038): at com.example.collegesoft.MainPage.call(MainPage.java:259) 01-31 10:41:37.575: E/AndroidRuntime(9038): at com.example.collegesoft.MainPage$CountDownTask.doInBackground(MainPage.java:284) 01-31 10:41:37.575: E/AndroidRuntime(9038): at com.example.collegesoft.MainPage$CountDownTask.doInBackground(MainPage.java:1) 01-31 10:41:37.575: E/AndroidRuntime(9038): at android.os.AsyncTask$2.call(AsyncTask.java:264) 01-31 10:41:37.575: E/AndroidRuntime(9038): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 01-31 10:41:37.575: E/AndroidRuntime(9038): ... 4 more 01-31 10:41:43.966: E/WindowManager(9038): Activity com.example.collegesoft.MainPage has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@41753818 that was originally added here 01-31 10:41:43.966: E/WindowManager(9038): android.view.WindowLeaked: Activity com.example.collegesoft.MainPage has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@41753818 that was originally added here 01-31 10:41:43.966: E/WindowManager(9038): at android.view.ViewRootImpl.&lt;init&gt;(ViewRootImpl.java:383) 01-31 10:41:43.966: E/WindowManager(9038): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:279) 01-31 10:41:43.966: E/WindowManager(9038): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:215) 01-31 10:41:43.966: E/WindowManager(9038): at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:140) 01-31 10:41:43.966: E/WindowManager(9038): at android.view.Window$LocalWindowManager.addView(Window.java:537) 01-31 10:41:43.966: E/WindowManager(9038): at android.app.Dialog.show(Dialog.java:278) 01-31 10:41:43.966: E/WindowManager(9038): at android.app.ProgressDialog.show(ProgressDialog.java:116) 01-31 10:41:43.966: E/WindowManager(9038): at android.app.ProgressDialog.show(ProgressDialog.java:104) 01-31 10:41:43.966: E/WindowManager(9038): at com.example.collegesoft.MainPage$CountDownTask.onPreExecute(MainPage.java:278) 01-31 10:41:43.966: E/WindowManager(9038): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:561) 01-31 10:41:43.966: E/WindowManager(9038): at android.os.AsyncTask.execute(AsyncTask.java:511) 01-31 10:41:43.966: E/WindowManager(9038): at com.example.collegesoft.MainPage$3$1$1.run(MainPage.java:82) 01-31 10:41:43.966: E/WindowManager(9038): at android.os.Handler.handleCallback(Handler.java:605) 01-31 10:41:43.966: E/WindowManager(9038): at android.os.Handler.dispatchMessage(Handler.java:92) 01-31 10:41:43.966: E/WindowManager(9038): at android.os.Looper.loop(Looper.java:137) 01-31 10:41:43.966: E/WindowManager(9038): at android.app.ActivityThread.main(ActivityThread.java:4514) 01-31 10:41:43.966: E/WindowManager(9038): at java.lang.reflect.Method.invokeNative(Native Method) 01-31 10:41:43.966: E/WindowManager(9038): at java.lang.reflect.Method.invoke(Method.java:511) 01-31 10:41:43.966: E/WindowManager(9038): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790) 01-31 10:41:43.966: E/WindowManager(9038): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) 01-31 10:41:43.966: E/WindowManager(9038): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>My call() method .... </p> <pre><code>protected void call() { Log.d(TAG,"Call Called"); myDbHelper = new DatabaseHelper(MainPage.this); try { myDbHelper.openDataBase(); } catch (SQLException sqle) { throw sqle; } Cursor c = myDbHelper.getAllStudentFromMainTable(); Log.d(TAG, "Cursor : " + c.getColumnCount()); //new CountDownTask().execute(); new SyncData().sendJson(c, myDbHelper, MainPage.this); //c.close(); } </code></pre>
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    3. COmake sure your asynch task called from UI thread
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