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BackPressCloseHandler.java
public class BackPressCloseHandler extends Activity {        
        private long backKeyPressedTime = 0;
        private Toast toast;
        private Activity activity;
        public BackPressCloseHandler(MainActivity context) {
                this.activity = context;
        }
        
        public void onBackPressed() {
                if (System.currentTimeMillis() > backKeyPressedTime + 2000) {
                        backKeyPressedTime = System.currentTimeMillis();
                        showGuide();
                        return;
                }
                if (System.currentTimeMillis() <= backKeyPressedTime + 2000) {                        
                        activity.finish();
                        toast.cancel();                        
                }
        }
        
        
        private void showGuide() {
                toast = Toast.makeText(activity, "µÚ·Î ¹öÆ°À» Çѹø ´õ ÅÍÄ¡ÇϽøé Á¾·áµË´Ï´Ù.",
                Toast.LENGTH_SHORT);
                toast.show();
        }
}




MainActivity.java
private BackPressCloseHandler backPressCloseHandler;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    backPressCloseHandler = new BackPressCloseHandler(this);
}

public void onBackPressed() {
    backPressCloseHandler.onBackPressed();
}
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