I solved my problem finally.
Just see below link:
https://stackoverflow.com/questions/3635101/how-to-sign-android-app-with-system-signature

Hi all, Can anybody help me for accessing Gpio in Android 5.1? My app works correctly but it doesn't work in Android 5.1. It comes with this error: "D/FriendlyARM-HW-Lib: Unable to open file /sys/devices/virtual/gpio/gpio74/direction" I using s5p4418-android-sd4g-20170613.img android. Than...