Snippet to show how to wait, then execute code on the UI thread. The example shown is part of an Activity.

DelayedRunOnUIThread.java

// Create a new thread inside your Actvity.
Thread thread = new Thread() {
    
    @Override
    public void run() {

        // Block this thread for 2 seconds.
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
        }

        // After sleep finished blocking, create a Runnable to run on the UI Thread.
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                hideNavigation();
            }
        });
        
    }
    
};

// Don't forget to start the thread.
thread.start();

// Borrowed from this Stack Overflow answer:
// http://stackoverflow.com/questions/3247554/how-to-show-a-view-for-3-seconds-and-then-hide-it