检查是否连接网络 方法：
//判断是否联网
private boolean checkConnectNetwork(Context context) {
ConnectivityManager conn = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo net = conn.getActiveNetworkInfo();
if (net != null && net.isConnected()) {
return true;
}
return false;
} //判断是否联网
private boole
