I met NavigationView Error while running my app on a device (API 19).
Error inflating class android.support.design.widget.NavigationView
It worked well on emulator. Error log showed details like this.
android.view.InflateException: Binary XML file line #11: Error inflating class android.support.design.widget.NavigationView
android.content.res.Resources$NotFoundException: File res/drawable/bg_nav.xml from drawable resource ID #0x7f020046
Finally, I found a solution. (But, I don’t know the exact reason…)\
My resources were only in drawable-v21 and I copied them to drawable.
(https://stackoverflow.com/questions/30709419/error-inflating-class-android-support-design-widget-navigationview)