Android学习笔记（三）：Flutter框架

一、安装

官方文档：https://flutter.cn/docs/get-started/install/windows

import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';

class MyApp extends StatelessWidget {
    
    
  @override
  Widget build(BuildContext context) {
    
    
    // 第一单元标题
    Widget titleSection = Container(
      padding: EdgeInsets.all(32),
      child: Row(
        children: [
          Expanded(
            /* 1 */
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                /* 1.1 */
                Container(
                  padding: EdgeInsets.only(bottom: 8),
                  child: Text(
                    "第一行标题",
                    style: TextStyle(
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                ),
                /* 1.2 */
                Text(
                  "第二行简述",
                  style: TextStyle(
                    color: Colors.grey[500]
                  ),
                )
              ],
            )
          ),
          /* 2 */
          Icon(
            Icons.star,
            color: Colors.red[500],
          ),
          /* 3 */
          Text('41'),
        ],
      ),
    );

    Color color = Theme.of(context).primaryColor;
    // 第二单元按钮
    Widget buttonSection = Row(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: [
        _buildButtonColumn(color, Icons.call, "CALL"),
        _buildButtonColumn(color, Icons.near_me, "ROUTE"),
        _buildButtonColumn(color, Icons.share, "SHARE"),
      ],
    );

    // 第三单元部分内容
    Widget textSection = Container(
      padding: EdgeInsets.all(32),
      child: Text(
          'Lake Oeschinen lies at the foot of the Blüemlisalp in the Bernese '
              'Alps. Situated 1,578 meters above sea level, it is one of the '
              'larger Alpine Lakes. A gondola ride from Kandersteg, followed by a '
              'half-hour walk through pastures and pine forest, leads you to the '
              'lake, which warms to 20 degrees Celsius in the summer. Activities '
              'enjoyed here include rowing, and riding the summer toboggan run.'
      )
    );

    return MaterialApp(
      title: "Study One Day",
      home: Scaffold(
        appBar: AppBar(

        ),
        body: ListView(
          children: <Widget>[
            Image.asset(
              'images/lake.jpg',
              width: 600,
              height: 240,
              fit: BoxFit.cover,
            ),
            titleSection,
            buttonSection,
            textSection,
          ],
        ),
      ),
    );
  }

  Column _buildButtonColumn(Color color, IconData icon, String text) {
    
    
    return Column(
      mainAxisSize: MainAxisSize.min,
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Icon(icon, color: color,),
        Container(
          margin: EdgeInsets.only(top: 10),
          child: Text(
            text,
            style: TextStyle(
              fontSize: 12,
              fontWeight: FontWeight.w400,
              color: color,
            ),
          ),
        )
      ],
    );
  }
}

void main() {
    
    
  runApp(MyApp());
}

二、问题汇总

flutter doctor --android-licenses

环境变量配置了 android sdk，报错：Android license status unknown.

android studio 设置中这个命令行工具勾上。解决。