Flutter学习笔记（41）--自定义Dialog实现版本更新弹窗

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功能点：

1.更新弹窗UI

2.强更与非强更且别控制

3.屏蔽物理返回键（因为强更的时候点击返回键，弹窗会消失）

4.点击弹窗外透明区域时，弹窗不消失

先看下效果图：

Dialog实现代码：

import 'package:flutter/material.dart';
import 'package:xiaopijiang/utils/assets_util.dart';
import 'package:xiaopijiang/utils/toast_util.dart';

///created by WGH
///on 2020/7/23
///description:版本更新提示弹窗
class UpdateDialog extends Dialog {
  final String upDateContent;
  final bool isForce;

  UpdateDialog({this.upDateContent, this.isForce});

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          Container(
             319,
            height: 370,
            child: Stack(
              children: <Widget>[
                Image.asset(
                  AssetsUtil.getImagePath(
                      imageName: 'bg_update', suffix: 'png'),
                  fit: BoxFit.cover,
                ),
                Container(
                   double.infinity,
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: <Widget>[
                      Container(
                        margin: EdgeInsets.only(top: 110),
                        child: Text('发现新版本',
                            style: TextStyle(
                                fontSize: 20,
                                color: Colors.white,
                                decoration: TextDecoration.none)),
                      ),
                      Text(upDateContent,
                          style: TextStyle(
                              fontSize: 16,
                              color: Colors.black54,
                              decoration: TextDecoration.none)),
                      Container(
                         250,
                        height: 42,
                        margin: EdgeInsets.only(bottom: 15),
                        child: RaisedButton(
                            color: Colors.red,
                            shape: StadiumBorder(),
                            child: Text(
                              '立即更新',
                              style:
                                  TextStyle(fontSize: 20, color: Colors.white),
                            ),
                            onPressed: () {
                              ToastUtil.showTips('下载apk');
                            }),
                      )
                    ],
                  ),
                ),
              ],
            ),
          ),
          GestureDetector(
            onTap: () {
              Navigator.pop(context);
            },
            child: Offstage(
              offstage: isForce,
              child: Container(
                  margin: EdgeInsets.only(top: 30),
                  child: Image.asset(
                    AssetsUtil.getImagePath(
                        imageName: 'ic_update_close', suffix: 'png'),
                     35,
                    height: 35,
                  )),
            ),
          )
        ],
      ),
    );
  }

  static showUpdateDialog(
      BuildContext context, String mUpdateContent, bool mIsForce) {
    return showDialog(
        barrierDismissible: false,
        context: context,
        builder: (BuildContext context) {
          return WillPopScope(
              child: UpdateDialog(
                  upDateContent: mUpdateContent, isForce: mIsForce),onWillPop: _onWillPop);
        });
  }

  static Future<bool> _onWillPop() async{
    return false;
  }
}

调用Dialog：

  _checkUpdate() async{
    int serviceVersionCode = 101;
    PackageInfo packageInfo = await PackageInfo.fromPlatform();
    //获取当前的版本号
    int currentVersionCode = int.parse(packageInfo.version.replaceAll('.', ''));
    //如果获取服务器的版本号比当前应用程序的版本号还高，那么提示升级
    if (serviceVersionCode > currentVersionCode) {
      if(Platform.isAndroid){
        //Android平台在应用内进行更新
        //弹出"版本更新"的对话框
        UpdateDialog.showUpdateDialog(context, '1.修复已知bug
2.优化用户体验', false);
      }else if(Platform.isIOS){
        //iOS平台跳转道AppStore进行更新
      }
    }
  }

重点说明：

屏蔽物理返回键（因为强更的时候点击返回键，弹窗会消失）

barrierDismissible: false,

4.点击弹窗外透明区域时，弹窗不消失

          return WillPopScope(
              child: UpdateDialog(
                  upDateContent: mUpdateContent, isForce: mIsForce),
              onWillPop: _onWillPop);

  static Future<bool> _onWillPop() async {
    return false;
  }