cashier_reserve_app/lib/update_version/update_version_view.dart

import 'package:cashier_reserve/common/print/print.dart';
import 'package:cashier_reserve/data_model/version/update_version_model.dart';
import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_app_installer/flutter_app_installer.dart';
import 'package:path_provider/path_provider.dart';
import 'package:percent_indicator/percent_indicator.dart';

class UpdateVersionView extends StatefulWidget {
  final UpdateVersionModel versionModel;

  const UpdateVersionView({super.key, required this.versionModel});

  @override
  State<StatefulWidget> createState() {
    return _UpdateVersionViewState();
  }
}

class _UpdateVersionViewState extends State<UpdateVersionView> {
  DateTime? lastPopTime;

  double progress = 0;
  String progressText = "0%";

  bool isDownload = false;

  // 用于控制下载任务取消的CancelToken
  CancelToken? _cancelToken;

  @override
  void dispose() {
    _cancelToken?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return PopScope(
      canPop: (widget.versionModel.isUp ?? 0) != 0,
      onPopInvokedWithResult: (didPop, result) async {
        // 点击返回键的操作
        if (lastPopTime == null ||
            DateTime.now().difference(lastPopTime!) >
                const Duration(seconds: 2)) {
          lastPopTime = DateTime.now();
          // Utils.toast('再按一次退出', context);
        } else {
          lastPopTime = DateTime.now();
          // 退出app
          await SystemChannels.platform.invokeMethod('SystemNavigator.pop');
        }
      },
      child: Scaffold(
        backgroundColor: Colors.black.withOpacity(0.2),
        body: GestureDetector(
          onTap: () {
            FocusScope.of(context).requestFocus(FocusNode());
          },
          child: Container(
            width: MediaQuery.of(context).size.width,
            height: MediaQuery.of(context).size.height,
            color: const Color(0x55000000),
            child: Center(
              child: Container(
                padding: const EdgeInsets.fromLTRB(30, 30, 30, 30),
                decoration: BoxDecoration(
                  color: Colors.white,
                  borderRadius: BorderRadius.circular(10),
                ),
                width: 400,
                // height: 400,
                child: SingleChildScrollView(
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      const Text(
                        "发现新版本",
                        style:
                            TextStyle(fontSize: 22, color: Color(0xff333333)),
                      ),
                      const SizedBox(
                        height: 20,
                      ),
                      Text(
                        widget.versionModel.message ?? "",
                        style: const TextStyle(
                            fontSize: 16, color: Color(0xff666666)),
                      ),
                      const SizedBox(
                        height: 20,
                      ),
                      isDownload
                          ? LinearPercentIndicator(
                              padding: EdgeInsets.zero,
                              animation: false,
                              lineHeight: 20.0,
                              // animationDuration: 2500,
                              percent: progress,
                              center: Text(progressText),
                              // linearStrokeCap: LinearStrokeCap.roundAll,
                              progressColor: Colors.green,
                            )
                          : Container(),
                      isDownload
                          ? const SizedBox(
                              height: 20,
                            )
                          : Container(),
                      _buildActionViews(context),
                    ],
                  ),
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildActionViews(BuildContext context) {
    bool isMustUpdate = widget.versionModel.isUp == 1;
    return Row(mainAxisAlignment: MainAxisAlignment.center, children: [
      isMustUpdate
          ? Container()
          : ElevatedButton(
              onPressed: () {
                Navigator.of(context).pop();
              },
              style: ButtonStyle(
                backgroundColor: WidgetStateProperty.all(Colors.white),
                foregroundColor:
                    WidgetStateProperty.all(const Color(0xff666666)),
                minimumSize: WidgetStateProperty.all(const Size(100, 40)),
                shape: WidgetStateProperty.all(const RoundedRectangleBorder(
                  borderRadius: BorderRadius.all(Radius.circular(20)),
                )),
              ),
              child: const Text("跳过"),
            ),
      isMustUpdate
          ? Container()
          : const SizedBox(
              width: 20,
            ),
      ElevatedButton(
        onPressed: () {
          startDownload();
        },
        style: ButtonStyle(
          backgroundColor: WidgetStateProperty.all(Colors.blue),
          foregroundColor: WidgetStateProperty.all(Colors.white),
          minimumSize:
              WidgetStateProperty.all(Size(isMustUpdate ? 200 : 100, 40)),
          shape: WidgetStateProperty.all(const RoundedRectangleBorder(
            borderRadius: BorderRadius.all(Radius.circular(20)),
          )),
        ),
        child: const Text("立即更新"),
      ),
    ]);
  }

  startDownload() async {
    setState(() {
      isDownload = true;
    });

    String fileUrl = widget.versionModel.url ?? "";
    if (fileUrl.isEmpty) {
      yjPrint("下载地址为空");
      return;
    }

    _cancelToken?.cancel();

    setState(() {
      progress = 0.0;
      progressText = "0.0%";
    });

    yjPrint("fileUrl: $fileUrl");

    Dio dio = Dio();
    try {
      String savePath = await getPhoneLocalPath();
      String appName = "file.apk";
      _cancelToken = CancelToken(); // 创建CancelToken对象
      await dio.download(
          fileUrl, "$savePath$appName", onReceiveProgress: (received, total) {
        if (total != -1) {
          ///当前下载的百分比例
          double currentProgress = received / total;
          setState(() {
            progressText = "${(currentProgress * 100).toStringAsFixed(2)}%";
            progress = double.parse(currentProgress.toStringAsFixed(2));
          });
          yjPrint(progressText);
        }
      }, cancelToken: _cancelToken);

      yjPrint("文件下载成功");
      _cancelToken = null;
      installApk("$savePath$appName");
    } catch (e) {
      yjPrint("文件下载失败：$e");
    }
  }

  Future<String> getPhoneLocalPath() async {
    final directory = await getExternalStorageDirectory();
    return directory?.path ?? '';
  }

  installApk(String apkPath) async {
    final FlutterAppInstaller flutterAppInstaller = FlutterAppInstaller();
    flutterAppInstaller.installApk(
      filePath: apkPath,
    );
  }
}