Android連結WiFi

1. wpa_supplicant -Dwext -iwlan0 -C/data/system/wpa_supplicant
    -c/data/misc/wifi/wpa_supplicant.conf
2. wpa_cli -p/data/system/wap_supplicant -iwlan0
    使用下面command設置WiFi
    scan
    scan_results
    add_network
    set_network <network id> <variable> <value>
    enable_network <network id>
    disable_network <network id>