完成app更新时显示下载进度条功能

lib/modules/application/application_controller.dart

@@ -166,6 +166,7 @@ class ApplicationController extends GetxController {
     await Future.delayed(Duration(seconds: 3), () async {
       if (ConfigService.isIOS == false &&
           await Permission.storage.isGranted == false) {
+        // 请求权限
         await [Permission.storage].request();
       }
       if (await Permission.storage.isGranted) {

lib/utils/update.dart

@@ -1,7 +1,8 @@
 import 'dart:io';
 
+import 'package:dio/dio.dart';
 import 'package:flutter/material.dart';
-import 'package:get/get.dart';
+import 'package:get/get.dart' hide Response;
 import 'package:install_plugin/install_plugin.dart';
 import 'package:news_getx/data/model/app.dart';
 import 'package:news_getx/data/repository/app_repository.dart';
@@ -10,6 +11,38 @@ import 'package:news_getx/modules/widgets/toast.dart';
 import 'package:news_getx/utils/http.dart';
 import 'package:path_provider/path_provider.dart';
 
+class DownloadController extends GetxController {
+  // 进度条
+  var _progressValue = 0.0.obs;
+
+  double get progressValue => _progressValue.value;
+
+  set progressValue(double value) {
+    _progressValue.value = value;
+  }
+
+  Future<Response> download(String fileUrl, String fullPath) async {
+    progressValue = 0;
+    return await HttpUtil().dio.download(
+      fileUrl,
+      fullPath,
+      options: Options(
+        receiveTimeout: Duration(minutes: 5),
+      ),
+      onReceiveProgress: (count, total) {
+        final value = count / total;
+        if (progressValue != value) {
+          if (progressValue < 1.0) {
+            progressValue = count / total;
+          } else {
+            progressValue = 0.0;
+          }
+        }
+      },
+    );
+  }
+}
+
 /// App 更新
 class AppUpdateUtil {
   static AppUpdateUtil _instance = AppUpdateUtil._internal();
@@ -84,9 +117,33 @@ class AppUpdateUtil {
         break;
       }
     }
-
     if (!isFileFound) {
-      await HttpUtil().dio.download(fileUrl, fullPath);
+      final DownloadController downloadController = Get.put(
+          DownloadController());
+      Get.dialog(
+        AlertDialog(
+          title: Text('文件下载中'),
+          content: Obx(() {
+            final percentage = downloadController.progressValue * 100;
+
+            if (percentage == 100) {
+              Get.back();
+            }
+
+            return Row(
+              children: [
+                Text('正在下载'),
+                Expanded(child: LinearProgressIndicator(
+                    value: downloadController.progressValue)),
+                Text(
+                    "${percentage.toStringAsFixed(0)}%"),
+              ],
+            );
+          }),
+        ),
+        barrierDismissible: false,
+      );
+      await downloadController.download(fileUrl, fullPath);
     }
     // 安装
     await InstallPlugin.installApk(fullPath);