How to Enable Soft-keys(Navigation Bar) on any android(#root)



First of all for those who do not know what soft keys are, some devices do not have any hardware buttons below the screen but have on-screen virtual buttons. These soft keys were first introduced in Android 4.0 Ice Cream Sandwich devices.




Warning: Before moving any further you should know that there is a risk to brick your device and your device may enter into bootloop. We won’t be held responsible for any damage caused to your device.
Pre-requirements:
Root access on your android device. Check out how to root your android device.
File manager on your device like X-plore or ES File Explorer or Root Explorerthrough which you can access your root memory.
The device must be charged at least upto 70%.

Enable Soft keys
Open the file manager
Navigate to /system in the root folder
Take a backup of the file build.prop for safety just in case something goes wrong
Open build.prop in a text editor
Add the following at the endqemu.hw.mainkeys=0‎

Save the file
Reboot your device
Disable the Soft keys

If you wish to disable the soft keys that you enabled on your android device follow this procedure.
Open the file manager
Navigate to /system in the root folder
Open build.prop in a text editor
At the end replace 0 with 1 or just restore the backup of build.prop

Original:qemu.hw.mainkeys=0


New:qemu.hw.mainkeys=1

Save the file
Reboot your device
Disable Capacitive buttons

Some mobiles will have only two capacitive buttons viz, back and menu. Some mobiles may have three capacitive buttons viz, back, home and app switch or; back, home and menu. So modify the file accordingly and dont mess with other parts of the code or else you will end up damaging your phone software.
Open the file manager
Navigate to /system/usr/keylayout in the root folder
Take a backup of the file Generic.kl for safety just in case something goes wrong
Open Generic.kl in a text editor
Add # before the following lines

Original:key 139 MENU key 158 BACK key 172 HOME key 580 APP_SWITCH‎


New:# key 139 MENU # key 158 BACK # key 172 HOME # key 580 APP_SWITCH‎

Save the file
Reboot your device
Disable the home button

Some devices like the Samsung Galaxy S5 will have a physical home button. To disable the home button follow this procedure. But it is advised not to disable this button.
Open the file manager
Navigate to /system/usr/keylayout in the root folder
Take a backup of the file gpio-keys.kl for safety just in case something goes wrong
Open gpio-keys.kl in a text editor
Add # before the following line

Original:key 102 HOME WAKE


New:# key 102 HOME WAKE

Save the file
Reboot your device

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