issue implementing an AsyncTask thread

Question

I have the following issue...I'm implementing a QR code game in my android application...that is done by launching this intent:

 Intent intent = new Intent(
                           "com.google.zxing.client.android.SCAN");
                   intent.setPackage("com.google.zxing.client.android");
                   intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
                   startActivityForResult(intent, 0); 

In other words I start the Barcode Scanner application.

Want I want to do is launch this application and even if the user starts scanning a barcode or not the application will close automatically after two minutes.

Of course if the user doesn't close it mean time.

I tried implementing an AsyncTask thread like this:

in onCreate()

initTask=new InitTask();
initTask.execute();

outside of onCreate()

private class InitTask extends AsyncTask<Void,Void,Void>{

           protected Void doInBackground(Void...unused){

           new Runnable() {
                @Override
                public void run() {
                 try {
                   Thread.sleep(20000);
                 } 
                 catch (InterruptedException e) {
                   e.printStackTrace();
                 }
                 Intent intent = new Intent(
                           "com.google.zxing.client.android.SCAN");
                   intent.setPackage("com.google.zxing.client.android");
                   intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
                   startActivityForResult(intent, 0); 
                }
               }.run();
                this.cancel(true);


           return null;

       }

   }

outside of onCreate()

   public void onActivityResult(int requestCode, int resultCode, Intent intent) {
     //..........
    }

The problem is that the app gets opened but it doesn't close automatically after 2 minutes. Does someone know how could I achieve that?

Answer 1

Update

private class InitTask extends AsyncTask<Void,Void,Void>{
@Override
protected void onPreExecute()
{
   Intent intent = new Intent("com.google.zxing.client.android.SCAN");
   intent.setPackage("com.google.zxing.client.android");
   intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
   startActivityForResult(intent, 1515);
}
protected Void doInBackground(Void...unused){

try
{
       Thread.sleep(20000);
}
catch(Exception e)
{
    System.out.println(e);
}
return null;

}
@Override
protected void onPostExecute(Void result) 
{

   finishActivity(1515);

}


}

Activity Result

public void onActivityResult(int requestCode, int resultCode, Intent intent) {
            if (requestCode == 1515) {
                if (resultCode == RESULT_OK) {
                    String contents = intent.getStringExtra("SCAN_RESULT");
                    String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
                    System.out.println("it is ok");
                    // Handle successful scan
                } else if (resultCode == RESULT_CANCELED) {
                    // Handle cancel
                    System.out.println("it is cancel");
                }
            }
        }