Android强制使用3G,Android 强制2G/3G或WIFI 优先上网

Android开发中有时候需要设定程序连接网络优先 2G/3G 或 WIFI，下面片段代码给出设置方法：

public void setPreferredNetwork(int networkType) {

ConnectivityManager connMgr = (ConnectivityManager) this.context.getSystemService("connectivity");

if (networkType == NetworkType.TYPE_MOBILE) {//设为2G/3G网络优先，就算wifi连接到AP，系统仍然通过2G/3G访问网络

connMgr.setNetworkPreference(0);

} else if (networkType == NetworkType.TYPE_WIFI) {

connMgr.setNetworkPreference(1);

}

WifiManager wifiMgr = (WifiManager) this.context.getSystemService("wifi");

wifiMgr.disconnect();

 }