Flutter APP内部APK下载以及安装

本帖主要实现Flutter安卓系统 APK在线下载以及安装

• 检查APK权限

//必要权限，安装权限 
<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
//写外置存储的权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
//读外置存储的权限
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
//读取手机状态和身份
<uses-permission android:name="android.permission.READ_PHONE_STATE" />

  引用架包：
  permission_handler: ^3.2.0

  引用：
  import 'package:permission_handler/permission_handler.dart';

  /// 检查是否有权限
  void checkPermission() async {
    PermissionStatus permission = await PermissionHandler()
        .checkPermissionStatus(PermissionGroup.storage);
    if (permission != PermissionStatus.granted) {
      Map<PermissionGroup, PermissionStatus> permissions =
          await PermissionHandler()
              .requestPermissions([PermissionGroup.storage]);
      if (permissions[PermissionGroup.storage] == PermissionStatus.granted) {
        return;
      }
    } else {
      return;
    }
  }

 

• 下载APK文件

  引用架包：
  dio: ^3.0.7

  引用文件：
  import 'dart:io';
  import 'package:dio/dio.dart';
  import 'package:path_provider/path_provider.dart';

  
  /// 下载并安装APK文件
  void updateAppEx(String url) async {
    try {
      File _apkFile = await downloadAndroid(url);
      _apkFilePath = _apkFile.path;

      if (_apkFilePath.isEmpty) {
        print('make sure the apk file is set');
        return;
      }
    } catch (e) {
      print('下载APK失败: $e');
    }
  }

  //用分割URL来获取下载的APK名称
  String getFlieName(String url) {
    try {
      if (url != null) {
        List<String> lstStr = url.split('/');
        return lstStr.last;
      }
    } catch (e) {
      print("获取下载文件名错误：$e");
    }
    return "";
  }

  /// 下载安卓更新包
  // ignore: missing_return
  Future<File> downloadAndroid(String url) async {
    //获取APK文件名
    String fileName = getFlieName(url);
    if (fileName != "") {
      /// 创建存储文件
      Directory storageDir = await getExternalStorageDirectory();
      String storagePath = storageDir.path;

      String filePath = '$storagePath/$fileName';
      File file = new File(filePath);
      try {
        // if (!file.existsSync()) {
        Dio dio = new Dio();
        // file.createSync();
        Response response = await dio.download(url, filePath,
            onReceiveProgress: (int count, int total) {
          //进度
          var d = (count / total).toStringAsFixed(2);
          _dPercent = double.parse(d);
          print((_dPercent * 100).toString() + "%");
          print("现在进度： 当前：$count  总：$total");
          setState(() {});
        });
        if (response.data.statusCode == 200) {
          _downloadFinish = true;
          print('文件下载完成！:${response.data}');
          setState(() {});
        }
        // }
        return file;
      } catch (e) {
        print(e);
      }
    }
  }

• 安装APK

  引用架包：
  install_plugin: ^2.0.1

  引用：
  import 'package:install_plugin/install_plugin.dart';

  //安装APK
  void installApk() {
    try {
      InstallPlugin.installApk(
              _apkFilePath, "com.example.flutterDemo")
          .then((result) {
        print('install apk $result');
      }).catchError((error) {
        print('install apk error: $error');
      });
    } catch (e) {
      print('安装APK失败: $e');
    }
  }

• 完整代码

import 'dart:io';
import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:install_plugin/install_plugin.dart';
import 'package:path_provider/path_provider.dart';
import 'package:percent_indicator/linear_percent_indicator.dart';
import 'package:permission_handler/permission_handler.dart';

class UpdateApk extends StatefulWidget {
  @override
  _UpdateApk createState() => _UpdateApk();
}

class _UpdateApk extends State<UpdateApk> {
  /// 检查是否有权限
  void checkPermission() async {
    PermissionStatus permission = await PermissionHandler()
        .checkPermissionStatus(PermissionGroup.storage);
    if (permission != PermissionStatus.granted) {
      Map<PermissionGroup, PermissionStatus> permissions =
          await PermissionHandler()
              .requestPermissions([PermissionGroup.storage]);
      if (permissions[PermissionGroup.storage] == PermissionStatus.granted) {
        return;
      }
    } else {
      return;
    }
  }

  String _apkFilePath = "";

  /// 下载并安装APK文件
  void updateAppEx(String url) async {
    try {
      File _apkFile = await downloadAndroid(url);
      _apkFilePath = _apkFile.path;

      if (_apkFilePath.isEmpty) {
        print('make sure the apk file is set');
        return;
      }
    } catch (e) {
      print('下载APK失败: $e');
    }
  }

  void installApk() {
    try {
      InstallPlugin.installApk(_apkFilePath, "com.example.flutterDemo")
          .then((result) {
        print('install apk $result');
      }).catchError((error) {
        print('install apk error: $error');
      });
    } catch (e) {
      print('安装APK失败: $e');
    }
  }

  String getFlieName(String url) {
    try {
      if (url != null) {
        List<String> lstStr = url.split('/');
        return lstStr.last;
      }
    } catch (e) {
      print("获取下载文件名错误：$e");
    }
    return "";
  }

  double _dPercent = 0;

  /// 下载安卓更新包
  // ignore: missing_return
  Future<File> downloadAndroid(String url) async {
    String fileName = getFlieName(url);
    if (fileName != "") {
      /// 创建存储文件
      Directory storageDir = await getExternalStorageDirectory();
      String storagePath = storageDir.path;

      String filePath = '$storagePath/$fileName';
      File file = new File(filePath);
      try {
        // if (!file.existsSync()) {
        Dio dio = new Dio();
        // file.createSync();
        Response response = await dio.download(url, filePath,
            onReceiveProgress: (int count, int total) {
          //进度
          var d = (count / total).toStringAsFixed(2);
          _dPercent = double.parse(d);
          print((_dPercent * 100).toString() + "%");
          print("现在进度： 当前：$count  总：$total");
          setState(() {});
        });
        if (response.data.statusCode == 200) {
          _downloadFinish = true;
          print('文件下载完成！:${response.data}');
          setState(() {});
        }
        // }
        return file;
      } catch (e) {
        print(e);
      }
    }
  }

  @override
  void initState() {
    // TODO: implement initState
    //初始化系统数据
    checkPermission();
    super.initState();
  }

  //下载APP
  Future updateApp() {
    setState(() {});
    //APK文件下载地址
    var url = "http://flutterdemo/demo_1_0_1.apk";
    updateAppEx(url);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Padding(
                padding: EdgeInsets.only(left: 10, top: 10, right: 10),
                child: MaterialButton(
                  color: Color(0xFF0F4C81),
                  textColor: Colors.white,
                  child: Text('下载APK', textAlign: TextAlign.center),
                  onPressed: updateApp,
                ),
              ),
              Padding(
                padding: EdgeInsets.only(left: 10, top: 10, right: 10),
                child: new LinearPercentIndicator(
                  width: MediaQuery.of(context).size.width - 20,
                  animation: true,
                  lineHeight: 25.0,
                  percent: _dPercent,
                  center: Text(((_dPercent * 100).toString() + "%")),
                  linearStrokeCap: LinearStrokeCap.roundAll,
                  progressColor: Colors.greenAccent,
                ),
              ),
              Padding(
                padding: EdgeInsets.only(left: 10, top: 10, right: 10),
                child: MaterialButton(
                  color: Color(0xFF0F4C81),
                  textColor: Colors.white,
                  child: Text('安装APK', textAlign: TextAlign.center),
                  onPressed: installApk,
                ),
              ),
            ]),
      ),
    );
  }
}