How to set app:layout_scrollFlags for Toolbar programmatically

Question

My app have a viewpager and 4 tabs, each tab have many fragment. But I just want my Toolbar scroll up/down while scrolling recyclerview in 2 specific tabs. But I don\'t know

Answer 1

// Show toolbar when we are in maps mode
AppBarLayout.LayoutParams params = (AppBarLayout.LayoutParams) mToolbar.getLayoutParams();
CoordinatorLayout.LayoutParams appBarLayoutParams = (CoordinatorLayout.LayoutParams) mAppBarLayout.getLayoutParams();
if(isMapIndex) {
    params.setScrollFlags(0);
    appBarLayoutParams.setBehavior(null);
    mAppBarLayout.setLayoutParams(appBarLayoutParams);
} else {
    params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS);
    appBarLayoutParams.setBehavior(new AppBarLayout.Behavior());
    mAppBarLayout.setLayoutParams(appBarLayoutParams);
}