Fix compilation with newer gradle
Fixes for compilation with a newer version of gradle. Main change is update of gradle plugin. Newer version comes with improved lints, so also them are fixed (e.g. unconstrained view, missing callback).
Fixes for compilation with a newer version of gradle. Main change is update of gradle plugin. Newer version comes with improved lints, so also them are fixed (e.g. unconstrained view, missing callback).