Flutter下载更新App的方法示例

if (Platform.isIOS) {
 final url = "https://itunes.apple.com/cn/app/id1380512641"; // id 后面的数字换成自己的应用 id 就行了
 if (await canLaunch(url)) {
  await launch(url, forceSafariVC: false);
 } else {
  throw 'Could not launch $url';
 }
}

dependencies {
  // 只复制这一行
  implementation 'com.king.app:app-updater:1.0.4-androidx'
}

package com.iwubida.flutter_yuedu.plugins;

import android.content.Context;
import android.util.Log;

import com.king.app.updater.AppUpdater;
import com.king.app.updater.callback.UpdateCallback;


import java.io.File;
import java.util.HashMap;
import java.util.Map;

import io.flutter.plugin.common.EventChannel;

import io.flutter.plugin.common.PluginRegistry.Registrar;

/** UpdateVersionPlugin */
public class UpdateVersionPlugin implements EventChannel.StreamHandler {

 private static String TAG = "MY_UPDATE";
 private static Context context;

 public UpdateVersionPlugin(Context context) {
  this.context = context;
 }

 /** Plugin registration. */
 public static void registerWith(Registrar registrar) {
  final EventChannel channel = new EventChannel(registrar.messenger(), "plugins.iwubida.com/update_version");
  channel.setStreamHandler(new UpdateVersionPlugin(registrar.context()));
 }


 @Override
 public void onListen(Object o, EventChannel.EventSink eventSink) {

  if (o.toString().length() < 5) {
   eventSink.error(TAG, "URL错误", o);
   return;
  }
  if (!o.toString().startsWith("http")){
   eventSink.error(TAG, "URL错误", o);
  }

  AppUpdater update = new AppUpdater(context,o.toString()).setUpdateCallback(new UpdateCallback() {

   Map data = new HashMap();

   // 发送数据到 Flutter
   private void sendData() {
    eventSink.success(data);
   }

   @Override
   public void onDownloading(boolean isDownloading) {

   }

   @Override
   public void onStart(String url) {
    data.put("start", true);
    data.put("cancel", true);
    data.put("done", true);
    data.put("error", false);
    data.put("percent", 1);
    sendData();
   }

   @Override
   public void onProgress(int progress, int total, boolean isChange) {
    int percent = (int)(progress * 1.0 / total * 100);
    if (isChange && percent > 0) {
     data.put("percent", percent);
     sendData();
    }
   }

   @Override
   public void onFinish(File file) {
    data.put("done", true);
    sendData();
   }

   @Override
   public void onError(Exception e) {
    data.put("error", e.toString());
    sendData();
   }

   @Override
   public void onCancel() {
    data.put("cancel", true);
    sendData();
   }
  });
  update.start();
 }

 @Override
 public void onCancel(Object o) {
  Log.i(TAG, "取消下载-集成的第三方下载没有提供取消方法");
 }
}

// 注册更新组件 在onCreate方法中
UpdateVersionPlugin.registerWith(registrarFor("iwubida.com/update_version"));

static const channelName = 'plugins.iwubida.com/update_version';
 static const stream = const EventChannel(channelName);
 // 进度订阅
 StreamSubscription downloadSubscription;
 int percent = 0;
 
  // 开始下载
 void _startDownload() {
  if (downloadSubscription == null) {
   downloadSubscription = stream
     .receiveBroadcastStream(widget.data.apkUrl)
     .listen(_updateDownload);
  }
 }

 // 停止监听进度
 void _stopDownload() {
  if (downloadSubscription != null) {
   downloadSubscription.cancel();
   downloadSubscription = null;
   percent = 0;
  }
 }

 // 进度下载
 void _updateDownload(data) {
  int progress = data["percent"];
  if (progress != null) {
   setState(() {
    percent = progress;
   });
  }
 }