Q:

hide and show statusbar without any effect to layout in android

I want to write a book-reader application that normally runs in full-screen, but when user touched screen, status bar become visible OVER my main layout without re-creating the whole view.
I already read these but no help at all:
Hide notification bar without using fullscreen
Hide Notification bar
Android Show Activity Title/status bar at the top after it is hidden
any idea how can I do it?
thanks

A:

finally, I did it!!
these 2 methods will show and hide status bar without destroying the layout.
you need to set 
private View mMainView; // The main view of the activity

private int mSystemUiVisibility = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;

then
    /** Hides StatusBar and ActionBar */
private void hideSystemUi() {

    ActionBar ab = getActionBar();
    ab.hide();

    // Set flags for hiding status bar
    int uiOptions = View.SYSTEM_UI_FLAG_FULLSCREEN;
    // Hide the status bar.
    mMainView.setSystemUiVisibility(uiOptions);}

and
   /** Shows StatusBar and ActionBar */
private void showSystemUi() {
    ActionBar ab = getActionBar();
    ab.show();
    // Reset flags 
    mMainView.setSystemUiVisibility(this.mSystemUiVisibility);
}

and put this in your onCreate() method:
mMainView = findViewById(R.id.mainLayout);
mMainView.setSystemUiVisibility(mSystemUiVisibility);

