1、引入：
import android.provider.Settings;
import android.content.ContentResolver;
ps：在Setting.System中有以下标志
WIFI_USE_STATIC_IP
WIFI_STATIC_IP
WIFI_STATIC_NETMASK
WIFI_STATIC_GATEWAY
WIFI_STATIC_DNS1 and WIFI_STATIC_DNS2
2、在AndroidManifest中加入<uses-permission android:name="android.permission.WRITE_SETTINGS"/>
3、在Activity中可以这样用：
final ContentResolver mContentResolver = getContentResolver();
Settings.System.putInt( mContentResolver, Settings.System.WIFI_USE_STATIC_IP, 1);
Settings.System.putString( mContentResolver, Settings.System.WIFI_STATIC_IP, "你的ip地址");
在android程序中怎么执行ifconfig命令来修改android 的ip地址，
