Answers for "android read external storage permission"

check supervisord status

sudo supervisorctl status

check supervisord status

$ ps aux | grep supervisor
root      1751  0.0  2.4  53668 12364 ?        Ss   01:41   0:00 /usr/bin/python /usr/bin/supervisord -c /etc/supervisor/supervisord.conf

storage permission android

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />