把音量键改成back键。

wanqi@wanqi-System-Product-Name:~/huiye_msm7627-6190/msm7627-6190$ adb shell ls /system/usr/
icu
share
srec
keylayout
keychars
wanqi@wanqi-System-Product-Name:~/huiye_msm7627-6190/msm7627-6190$ adb shell ls /system/usr/keylayout/
AVRCP.kl
qwerty.kl
7k_handset.kl
7k_ffa_keypad.kl
wanqi@wanqi-System-Product-Name:~/huiye_msm7627-6190/msm7627-6190$ adb pull /system/usr/keylayout/7k_ffa_keypad.kl .
23 KB/s (1969 bytes in 0.082s)
wanqi@wanqi-System-Product-Name:~/huiye_msm7627-6190/msm7627-6190$ vim 7k_ffa_keypad.kl
wanqi@wanqi-System-Product-Name:~/huiye_msm7627-6190/msm7627-6190$
wanqi@wanqi-System-Product-Name:~/huiye_msm7627-6190/msm7627-6190$
wanqi@wanqi-System-Product-Name:~/huiye_msm7627-6190/msm7627-6190$
wanqi@wanqi-System-Product-Name:~/huiye_msm7627-6190/msm7627-6190$ adb push 7k_ffa_keypad.kl /system/usr/keylayout/
41 KB/s (1964 bytes in 0.046s)
wanqi@wanqi-System-Product-Name:~/huiye_msm7627-6190/msm7627-6190$ adb reboot
wanqi@wanqi-System-Product-Name:~/huiye_msm7627-6190/msm7627-6190$ adb push 7k_ffa_keypad.kl /system/usr/keylayout/