判断当前网络是否可用
public boolean isNetworkAvailable () {
Context mContext = getApplication();
ConnectivityManager networkManager =
(ConnectivityManager) mContext.getSystemService[size=medium][/size](mContext.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = networkManager.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isAvailable()) {
return true;
}
return false;
}