Destroy middle activity in android
<p>I just saw a piece of code:</p>

<pre><code>public class MyApplication extends Application {

        private List&lt;Activity&gt; activityList = new LinkedList&lt;Activity&gt;();
        private static MyApplication instance;

        private MyApplication() {
        }

        public static MyApplication getInstance() {
                if (null == instance) {
                        instance = new MyApplication();
                }
                return instance;

        }


        public void addActivity(Activity activity) {
                activityList.add(activity);
        }


        public void exit() {

                for (Activity activity : activityList) {
                        activity.finish();
                }

                System.exit(0);

        }

}
</code></pre>

<p>I never thought that we can take control of other activity beside the current one. I usually call finish() inside its own activity, now I saw this code, I realize that we can finish() other activity as well.</p>

<p>Android stack is back stack architecture, so if I destroy any activity in the middle, what will happen? For example, I have 5 activity in the back stack, let say I finish() the third one, will the second and fourth be linked together now?</p>
