[移动开发]flutter实现app内部更新

import 'dart:io';
import 'dart:isolate';
import 'dart:ui';
import 'package:flutter_downloader/flutter_downloader.dart';
import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:path_provider/path_provider.dart';
import 'package:install_plugin/install_plugin.dart';
import 'package:android_path_provider/android_path_provider.dart';

class DownloadProvide with ChangeNotifier{
  ReceivePort _port = ReceivePort();
  bool _permissisonReady;
  String _localPath;
  String apkDownLoadUrl;
  String appName;

  initDownload(){
    IsolateNameServer.removePortNameMapping("downloader_send_port");
    IsolateNameServer.registerPortWithName(_port.sendPort, "downloader_send_port");
    _port.listen((message) { 
      String id = message[0];
      DownloadTaskStatus status = message[1];
      int progress = message[2];
      debugPrint("id====="+id+"=======progress$progress");
      if(status == DownloadTaskStatus.complete){
        debugPrint("下载完成,自动安装");
        clickInstallApk();
      }
    });
    FlutterDownloader.registerCallback(downloadCallback);
  }

  static void downloadCallback(String id, DownloadTaskStatus status, int progress){
    final SendPort send = IsolateNameServer.lookupPortByName("downloader_send_port");
    send.send([id,status,progress]);
  }

  void clickInstallApk() async {
      var _apkFilePath = _localPath+"/$appName";
      if (_apkFilePath.isEmpty) {
        print('make sure the apk file is set');
        return;
      }
      InstallPlugin.installApk(_apkFilePath, '包名').then((result) {
        print('install apk $result');
      }).catchError((error) {
        print('install apk error: $error');
      });
    }

  downLoadApk() async{
    _permissisonReady = false;
    await _prepare();
    if (_permissisonReady) {
      await _prepareDeleteFile();
      _requestDownload();
    } else {
      _checkPermission().then((hasGranted) {
        _permissisonReady = hasGranted;
      });
    }
  }

  // 获取安装地址
  Future<String> get _apkLocalPath async {
    var externalStorageDirPath;
    if (Platform.isAndroid) {
      try {
        externalStorageDirPath = await AndroidPathProvider.downloadsPath;
      } catch (e) {
        final directory = await getExternalStorageDirectory();
        externalStorageDirPath = directory?.path;
      }
    } else if (Platform.isIOS) {
      externalStorageDirPath =
          (await getApplicationDocumentsDirectory()).absolute.path;
    }
    return externalStorageDirPath;
  }

  void _requestDownload() async {
    // final path = await _apkLocalPath;
    await FlutterDownloader.enqueue(
      url: apkDownLoadUrl,
      fileName: "$appName",
      savedDir: _localPath,
      showNotification: true, // show download progress in status bar (for Android)
      openFileFromNotification: false, // click on notification to open downloaded file (for Android)
      saveInPublicStorage: true,
    );
  }

  Future<Null> _prepare() async {
    _permissisonReady = await _checkPermission();
  }

  // 检查权限
  Future<bool> _checkPermission() async {
    if (Platform.isAndroid) {
      final status = await Permission.storage.status;
      if (status != PermissionStatus.granted) {
        final result = await Permission.storage.request();
        if (result == PermissionStatus.granted) {
          return true;
        }
      } else {
        return true;
      }
    } else {
      return true;
    }
    return false;
  }

  Future<void> _prepareDeleteFile() async {
    _localPath = await _apkLocalPath;
    File file = File(_localPath+"/"+appName);
    bool exist = file.existsSync();
    if(exist){
      file.deleteSync(recursive: true);
    }
  }

  

}

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