判断网络是否可用

[android]代码库

/**
	 * check if the network is available
	 * @param context
	 * @return true if the network is available, false the other
	 */
	public static Boolean NetworkState(Context context) {
		ConnectivityManager connectivity = (ConnectivityManager) context
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		if (connectivity == null) {
			return false;
		} else {
			// Obtain all network connection information
			NetworkInfo[] info = connectivity.getAllNetworkInfo();
			if (info != null) {
				for (int i = 0; i < info.length; i++) {
					if (info[i].getState() == NetworkInfo.State.CONNECTED) {
						return true;
					}
				}
			}
		}

		return false;
	}

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