hunterstich/awareviewpager

A ViewPager with a parallax header, transforming toolbar and tabs

awareviewpager's Issues

Landscape - The fab and header box aren't positioned properly

The issue causing both errors (the fab and transparent bar) had to do with the header_box RelativeLayout. The layout was set to have a height of 375dp. When the screen was rotated, the actual screen height was less than 375dp and the header_box layout height was being shrunk.

Since both the fab positioning and the RecyclerView's header placeholder were using that 375dp to position/set themselves, it caused a gap equal to the difference between the screen size and 375dp. To fix it, I've added a setHeaderHeight() step which runs in onCreate and checks for screen height and sets a variable equal to the appropriate header height called mHeaderHeight. If the screen height is less than the default 375, the header_box is reset to the height of the screen - a small offset. The fab now uses mHeaderHeight to position itself, which fixed it.

For the RecyclerView, there is now a method in the main activity called getHeaderHeight(). When a fragment creates a new adapter for its RecyclerView, it retrieves the value of mHeaderHeight from the main activity.

The only caveat with the solution I've used is that it isn't possible use a header_box that has a height larger than the screen size. This might become an issue if you wanted to modify the contents of the title box which would make it taller. For example, a short paragraph (a short description of Finsteraarhorn in the examples case).

I originally tried to solve the issue by stopping header_box from clipping to the size of the screen, but couldn't get it to work. A whole restructuring of the header_box might be a good idea for more flexibility.

found a bug

when header hide, then change tabs, scroll down, header will jump.