d

wallpaper/lib/main.dart

@@ -1,9 +1,11 @@
 import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
+import 'package:wallpaper/utils/downloadmanager.dart';
 
 // import 'TestApp.dart';
 import 'WallPaperApp.dart';
-void main() {
+Future<void> main() async {
+  await DownloadManager.downloadImgWithUrl("https://resource-sg-public.lux-ad.com/wallpaper/4f1e7f66f26003b0ea83f4934302ce84.jpg");
   runApp(const WallPaperApp());
 
 }

wallpaper/lib/utils/downloadmanager.dart

@@ -0,0 +1,19 @@
+
+import 'dart:io';
+import 'package:flutter/foundation.dart';
+
+class DownloadManager {
+  static Future<void> downloadImgWithUrl(String urlStr) async {
+    var httpClient = HttpClient();
+    try {
+      var reqiest = await httpClient.getUrl(Uri.parse(urlStr));
+      var response = await reqiest.close();
+      // var bytes = await consolidateHttpClientResponseBytes(response);
+      var bytes = await consolidateHttpClientResponseBytes(response);
+      print("the bytes:${bytes}");
+    }
+    catch(error) {
+      print("the error:${error}");
+    }
+  }
+}

wallpaper/lib/utils/local_img_manager.dart

@@ -0,0 +1,40 @@
+import 'dart:io';
+import 'dart:typed_data';
+import 'package:path_provider/path_provider.dart';
+
+
+import 'package:flutter/foundation.dart';
+import 'dart:math';
+import 'dart:convert';
+
+import 'package:crypto/crypto.dart';
+
+class LocalImgManager {
+  static Future<String> getImgLocalDir() async {
+    Directory dir = await getTemporaryDirectory();
+    return  dir.path;
+  }
+  
+  static Future<String> saveImgDataBytes(Uint8List data) async {
+    String fileName = "img_${LocalImgManager.sha1RandomString()}.jpg";
+    var localDir = await getImgLocalDir();
+    var filePath = '$localDir/$fileName';
+
+    File imageFile=File(filePath);
+    if(imageFile.existsSync()){
+      print("图片已存在");
+      return "";
+    }
+    imageFile.writeAsBytes(data);
+    return  fileName;
+  }
+
+
+  static String sha1RandomString() {
+    final randomNumber = Random().nextDouble();
+    final randomBytes = utf8.encode(randomNumber.toString());
+    final randomString = sha1.convert(randomBytes).toString();
+    return randomString;
+  }
+
+}

wallpaper/pubspec.lock

@@ -154,7 +154,7 @@ packages:
     source: hosted
     version: "3.1.1"
   crypto:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: crypto
       sha256: ff625774173754681d66daaf4a448684fb04b78f902da9cb3d308c19cc5e8bab
@@ -497,7 +497,7 @@ packages:
     source: hosted
     version: "1.9.0"
   path_provider:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: path_provider
       sha256: c9e7d3a4cd1410877472158bee69963a4579f78b68c65a2b7d40d1a7a88bb161

wallpaper/pubspec.yaml

@@ -49,6 +49,12 @@ dependencies:
   hive: ^2.2.3
   hive_flutter: ^1.1.0
   
+  #获取本地文件的缓存路径
+  path_provider: ^2.1.3
+
+  #随机生成文件名
+  crypto: ^3.0.3
+
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.6
@@ -57,6 +63,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  #数据库
   hive_generator: ^ 2.0.1 
   build_runner: ^ 2.4.9
   # The "flutter_lints" package below contains a set of recommended lints to