download_file: show error + exponential sleep
download_file: show error + exponential sleep
kronenpj/python-for-android,kivy/python-for-android,kronenpj/python-for-android,kronenpj/python-for-android,kronenpj/python-for-android,kronenpj/python-for-android,PKRoma/python-for-android,kivy/python-for-android,PKRoma/python-for-android,kivy/python-for-android,PKRoma/python-for-android,PKRoma/python-for-android,kivy/python-for-android,PKRoma/python-for-android,kivy/python-for-android