判断Android客户端网络是不是连接

	public static boolean checkNet(Context context) {		try {			ConnectivityManager connectivity = (ConnectivityManager) context					.getSystemService(Context.CONNECTIVITY_SERVICE);			if (connectivity != null) {				NetworkInfo info = connectivity.getActiveNetworkInfo();				if (info != null && info.isConnected()) {					if (info.getState() == NetworkInfo.State.CONNECTED) {						return true;					}				}			}		} catch (Exception e) {			return false;		}		return false;	}

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//打印判断结果System.out.println(checkNet(this));

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另外，一定要加入权限

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

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