Android 检测网络是否可用

/**

	 * 检测网络是否可用

	 * @return

	 */

	public boolean isNetworkConnected() {

		ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

		NetworkInfo ni = cm.getActiveNetworkInfo();

		return ni != null && ni.isConnectedOrConnecting();

	}