Android fitsSystemWindows not working when replacing fragments

Question

I have SingleFramgnetActivity whose purpose is only to hold and replace fragments inside it.

layout looks like this:

Answer 1

You could also build a custom WindowInsetsFrameLayout and use a OnHierarchyChangedListener to request applying the insets again:

public WindowInsetsFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);

    // Look for replaced fragments and apply the insets again.
    setOnHierarchyChangeListener(new OnHierarchyChangeListener() {
        @Override
        public void onChildViewAdded(View parent, View child) {
            requestApplyInsets();
        }

        @Override
        public void onChildViewRemoved(View parent, View child) {

        }
    });
}

Check out this detailed answer: https://stackoverflow.com/a/47349880/3979479