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android command shell

android : how to run a shell command from within code

I am trying to execute a command from within my code,
the command is “echo 125 > /sys/devices/platform/flashlight.0/leds/flashlight/brightness”
and I can run it without problems from adb shell

I am using Runtime class to execute it :

Runtime.getRuntime().exec("echo 125 > /sys/devices/platform/flashlight.0/leds/flashlight/brightness");

However I get a permissions error since I am not supposed to access the sys directory.
I have also tried to place the command in a String[] just in case spaces caused a problem but it didn’t make much differense.

Does anyone know any workaround for this ?