Android AsyncTask is not working

Question

I got error on `onPreExecute()'

See my code : I have confuse here( download method (loadDailyDownloadData)contain in the different class & calling AsyncTask is different class...)

public class ListRoutesActivity extends Activity {

 public void onNextAction(View view){
    if(selectedRoutes.size() > 0){
        StringBuffer routeCode = new StringBuffer();
        for(int i=0; i<selectedRoutes.size();i++){
            routeCode.append("\'" + selectedRoutes.get(i) +"\'" +",");
        }
        routeCode.delete(routeCode.length() - 1,routeCode.length());
        strUField1 = routeCode.toString();
        new DailyDownldAsyncTask().execute();
    //  String s = new DownlaodTableActivity().loadDailyDownloadData(strBusinessUnit, strExecutive,strTerritoryCode,strUField1);
    //  System.out.println(" ---s - " + s);

    }else{
        Toast.makeText(ListRoutesActivity.this,"Please select the Route!",Toast.LENGTH_SHORT).show();
    }
     return;
 }



     public class DailyDownldAsyncTask extends AsyncTask<String, Integer, String> {
         private final ProgressDialog dialog = new ProgressDialog(ListRoutesActivity.this);
         int myProgress;

        @Override
        protected void onPostExecute(String result) {
            System.out.println(" ---- result--- " + result);
            if (this.dialog.isShowing()) {
                this.dialog.dismiss();
            }
            Toast.makeText(ListRoutesActivity.this,"Download successfully",Toast.LENGTH_SHORT).show();

        }

      @Override
      protected void onPreExecute() {

          this.dialog.setMessage("Downloading Table Data.......");
          this.dialog.show();
          myProgress = 0;
      }

      @Override
      protected String doInBackground(String... params) {
          return  new DownlaodTableActivity().loadDailyDownloadData(strBusinessUnit, strExecutive,strTerritoryCode,strUField1);

      }

      @Override
      protected void onProgressUpdate(Integer... values) {
          dialog.setProgress(values[0]);
      }
 }}

Here is my logcat :

08-19 17:45:18.933: ERROR/AndroidRuntime(472): FATAL EXCEPTION: main
08-19 17:45:18.933: ERROR/AndroidRuntime(472): java.lang.IllegalStateException: Could not execute method of the activity
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at android.view.View$1.onClick(View.java:2144)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at android.view.View.performClick(View.java:2485)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at android.view.View$PerformClick.run(View.java:9080)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at android.os.Handler.handleCallback(Handler.java:587)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at android.os.Handler.dispatchMessage(Handler.java:92)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at android.os.Looper.loop(Looper.java:123)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at android.app.ActivityThread.main(ActivityThread.java:3683)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at java.lang.reflect.Method.invokeNative(Native Method)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at java.lang.reflect.Method.invoke(Method.java:507)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at dalvik.system.NativeStart.main(Native Method)
08-19 17:45:18.933: ERROR/AndroidRuntime(472): Caused by: java.lang.reflect.InvocationTargetException
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at java.lang.reflect.Method.invokeNative(Native Method)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at java.lang.reflect.Method.invoke(Method.java:507)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at android.view.View$1.onClick(View.java:2139)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     ... 11 more
08-19 17:45:18.933: ERROR/AndroidRuntime(472): Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@4054c798 is not valid; is your activity running?
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at android.view.ViewRoot.setView(ViewRoot.java:527)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at android.view.Window$LocalWindowManager.addView(Window.java:424)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at android.app.Dialog.show(Dialog.java:241)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at com.xont.controller.admin.ListRoutesActivity$DailyDownldAsyncTask.onPreExecute(ListRoutesActivity.java:164)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at android.os.AsyncTask.execute(AsyncTask.java:391)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     at com.xont.controller.admin.ListRoutesActivity.onNextAction(ListRoutesActivity.java:100)
08-19 17:45:18.933: ERROR/AndroidRuntime(472):     ... 14 more

Without AsynTask my functionality is working fine that mean if I call new DownlaodTableActivity().loadDailyDownloadData(strBusinessUnit, strExecutive,strTerritoryCode,strUField1); this method directly without AsynTask , Its working fine

Please Help me Thanks in advance

Answer 1

As it seems, your DownlaodTableActivity() is indeed not running. You can't start an activity but just instantiating it, you need to call startActivity(Intent), passing the Intent for the activity you want to start. However, your code looks weird. The DownlaodTableActivity().loadDailyDownloadData(strBusinessUnit, strExecutive,strTerritoryCode,strUField1); method can be placed in a class that doesn't extend activity, then you'll have no problems. Hope this helps.