Question

I am trying to get notification whenever a new email arrives in inbox, code is given below. My application becomes irresponsive after short time, although in logCat application is still communicating with the imap server….but android system ask me to either wait or close this application. Is this because of the “thread.sleep()”? How can I solve it?

Can any one guide me? :/

@Override

public void onStart(Intent intent, int startid) {
    Toast.makeText(this, "My Service Started", Toast.LENGTH_LONG).show();
    Log.d(TAG, "onStart");
    //player.start();
    //add listenser and keep listening
    try{
        folder.addMessageCountListener(new MessageCountAdapter() {//start
            public void messagesAdded(MessageCountEvent ev) {
                Message[] msgs = ev.getMessages();
                // msgs.length

                Log.d(TAG, "It is inside LISTENER");

            }
            });//end    
         for (; ;) {
                Thread.sleep(20000); // sleep for freq milliseconds

                // This is to force the IMAP server to send us
                // EXISTS notifications. 
                Log.d(TAG, "AFTER SLEEP");
                folder.getMessageCount();
                }
    }
    catch(Exception e){

    }

}

Answer 1

1. onStart is deprecated. You should use onStartCommand instead.

2. The system calls both onStart and onStartCommand on the main UI Thread. The reason why your app is appearing to be “irresponsive” is because you are calling Thread.sleep(20000) on the main UI thread. The main UI thread is responsible for generating your layouts and responding to touch/UI events. The call to Thread.sleep is preventing all of this from happening, and thus your app appears to be hang (and eventually you get an Application Not Responding error).