Android強制2 G/3 GまたはWIFI優先インターネット

	public void setPreferredNetwork(int networkType) {
		ConnectivityManager connMgr = (ConnectivityManager) this.context.getSystemService("connectivity");
		if (networkType == NetworkType.TYPE_MOBILE) {//  2G/3G    ，  wifi   AP，      2G/3G    
			connMgr.setNetworkPreference(0);
		} else if (networkType == NetworkType.TYPE_WIFI) {
			connMgr.setNetworkPreference(1);
		}
		WifiManager wifiMgr = (WifiManager) this.context.getSystemService("wifi");
		wifiMgr.disconnect();
	}