I built apk from simple plyer example
from kivy.app import App

from plyer.notification import notify

class AndroidApp(App):
    def build(self):
        notify('Some title', 'Some message text')

AndroidApp().run()

apk crashes on phones (tried with kitkat and marshmallow).

build command: p4a apk --private /home/sayeem/kiviapps/ --package=org.example.pl4 --name "pl4" --version 0.1 --bootstrap=sdl2 --requirements=kivy==master,plyer,android

logcat: attached...
logcat1.txt

Edit: Other simple apps from kivy examples works fine on phone