ButterKnife inside fragment and toolbar height

Question

I am starting to use ButterKnife and I got it is working inside fragment with views that are inflated.

But I have a question, is it possible to get views which aren't inflated?

For example, I have a toolbar inside of my MainActivity, but not inside the fragment. Can I access to this toolbar using ButterKnife?.

And other question. I tried to get the toolbar height using:

Toolbar toolbar = getActivity().findViewById(R.id.toolbar);
int toolbarHeight = toolbar.getHeight();

But this return always 0. How can I get the toolbar size from the view directly? Now I am using:

 getActivity().getTheme().resolveAttribute(android.R.attr.actionBarSize, typedValueToolbarHeight, true);

But really I would like to get the toolbar from the view.

Answer 1

Initialize the view and call this method in on create method

 view.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() { 
    @SuppressLint("NewApi")
     @SuppressWarnings("deprecation") 
    @Override 
    public void onGlobalLayout() {
     //now we can retrieve the width and height 
    int width = view.getWidth(); 
    int height = view.getHeight(); 
    //... //do whatever you want with them //... //this is an important step not to keep receiving callbacks: //we should remove this listener //I use the function to remove it based on the api level!
     if(android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN)
     view.getViewTreeObserver().removeOnGlobalLayoutListener(this);
     else
     view.getViewTreeObserver().removeGlobalOnLayoutListener(this); 
    } });