android 判断是否联网

下面的方法返回false表示网络不通

// 检测网络
	public static boolean checkNetworkAvailable(Context context) {
		ConnectivityManager connectivity = (ConnectivityManager) context
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		if (connectivity == null) {
			return false;
		} else {
			NetworkInfo[] info = connectivity.getAllNetworkInfo();
			if (info != null) {
				for (int i = 0; i < info.length; i++) {
					if (info[i].getState() == NetworkInfo.State.CONNECTED) {
						NetworkInfo netWorkInfo = info[i];
						if (netWorkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
							return true;
						} else if (netWorkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
							return true;
						}
					}
				}
			}
		}

		return false;

	}