Flutter app 3.添加 loading toast

1.添加loading

创建 Loading Widget

LoginPage.dart 中

Widget _buildBody(){
    if (_isLoading) {
      return _buildLoading();
    } else {
      return new ListView(
        children: <Widget>[
          _buildCustomBar(),
          _buildAccountEdit(),
          _buildPWDEdit(),
          _buildLogin(),
          _buildTips(),
        ],
      );
    }
  }

loading

Widget _buildLoading() {

    return new Container(
      padding: const EdgeInsets.all(32.0),
      child: new Center(
        child: new CircularProgressIndicator(),
      ),
    );

  }

var  _isLoading  = false ;

更新 状态

void showLoading(bool isshowLoading) {
    setState( () {
      _isLoading = isshowLoading;
      },
    );
  }}

显示

showLoading(true);

2. Toast

参考
https://pub.dartlang.org/packages/fluttertoast#-installing-tab-

1. Depend it

Add this to your package’s pubspec.yaml file:

dependencies:
  fluttertoast: ^2.0.7

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter packages get

Alternatively, your editor might support flutter packages get. Check the docs for your editor to learn more.

3. 使用

util/ToastUtils.dart

import 'package:fluttertoast/fluttertoast.dart';

class ToastUtils {

  static void showLongToast(String  msg) {
    Fluttertoast.showToast(
      msg: msg,
      toastLength: Toast.LENGTH_LONG,
    );
  }

  static void showColoredToast(String msg,String bgcolor,String textcolor) {
    Fluttertoast.showToast(
        msg: msg,
        toastLength: Toast.LENGTH_SHORT,
        bgcolor: bgcolor,
        textcolor: textcolor
    );
  }

  static void showShortToast(String msg) {
    Fluttertoast.showToast(
        msg: msg,
        toastLength: Toast.LENGTH_SHORT,
        timeInSecForIos: 1
    );
  }
  static void showTopShortToast(String msg) {
    Fluttertoast.showToast(
        msg: msg,
        toastLength: Toast.LENGTH_SHORT,
        gravity: ToastGravity.TOP,
        timeInSecForIos: 1
    );
  }
  static void showCenterShortToast(String msg) {
    Fluttertoast.showToast(
        msg: msg,
        toastLength: Toast.LENGTH_SHORT,
        gravity: ToastGravity.CENTER,
        timeInSecForIos: 1
    );
  }
}

LoginPage.dart

ToastUtils. showShortToast("登陆成功") ;