Alright. Let’s get straight to it - here’s an example of action bar (the title row above the top-tabs)
The “WhatsApp” on top is the action bar (I don’t need the search feature). Since I wanted my app to have both action bar and top-tabs, I ended up creating a custom top-tab navigator with buttons & a column.
In my case, the action bar is a simple row with a background pic. The two tabs are buttons, which show & hide the contents of their respective tab & the indicators below them are colored labels. It was all going perfect, until a few weeks before I started experiencing bugs related to visibility. So, custom top tabs and action bar is not working for me.
In simple words, I just want a ~50px tall row/column above the default top-tabs. Do you have any way to achieve this? By negative margin/padding or by any other way? If so, sharing it would be really helpful 
Thanks!