判断现阶段网络是否可用

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;
    }