fix：增加图片选择和拍照功能

2026-06-23 10:07:35 +08:00
parent 75ba309e8c
commit 8cf919283b
16 changed files with 1288 additions and 45 deletions
@@ -0,0 +1,119 @@
+import 'dart:io';
+import 'dart:ui' as ui;
+import 'dart:ui';
+
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_cache_manager/flutter_cache_manager.dart';
+import 'package:gal/gal.dart';
+import 'package:http/http.dart' as http;
+import 'package:jinzhi_flutter_app/common/services/device_header_service.dart';
+import 'package:permission_handler/permission_handler.dart';
+
+class ImageUtil {
+  static const String _albumName = 'jinzhi';
+
+  static Stream<FileResponse> downloadImage(String url, String key) {
+    return DefaultCacheManager().getFileStream(
+      url,
+      key: key,
+      withProgress: true,
+    );
+  }
+
+  static Future<String> downloadImageInFile(String url, String key) async {
+    final file = await DefaultCacheManager().getSingleFile(url, key: key);
+    return file.path;
+  }
+
+  static Future<bool> requestForImagePermission() async {
+    if (Platform.isIOS) {
+      PermissionStatus photoStatus = await Permission.photosAddOnly.status;
+      if (photoStatus != PermissionStatus.granted) {
+        photoStatus = await Permission.photosAddOnly.request();
+        if (photoStatus != PermissionStatus.granted) {
+          return false;
+        }
+      }
+    } else if (Platform.isAndroid) {
+      int? sdkInt = DeviceHeaderService.to.androidDeviceInfo?.version.sdkInt;
+      if (sdkInt != null && sdkInt >= 33) {
+        // ✅ Android 13+ 不需要读权限，直接返回 true
+        // gal 插件内部通过 MediaStore 写入
+        return true;
+      } else {
+        // ✅ Android 10-12 仍可能需要 storage 权限
+        final status = await Permission.storage.request();
+        return status.isGranted;
+      }
+    } else {
+      return false;
+    }
+    return true;
+  }
+
+  static Future<void> saveImage(FileInfo fileInfo) async {
+    await Gal.putImage(fileInfo.file.path, album: _albumName);
+  }
+
+  static Future<void> saveImageData(ByteData byteData) async {
+    Uint8List imageBytes = byteData.buffer.asUint8List();
+    await Gal.putImageBytes(
+      imageBytes,
+      name: 'XWallpaper_share',
+      album: _albumName,
+    );
+  }
+
+  static Future<void> saveImageUint8List(Uint8List imageBytes) async {
+    await Gal.putImageBytes(
+      imageBytes,
+      name: 'XWallpaper_share',
+      album: _albumName,
+    );
+  }
+
+  static Future<void> saveUIImageData(ui.Image image) async {
+    final byteData = await image.toByteData(format: ui.ImageByteFormat.png);
+    Uint8List imageBytes = byteData!.buffer.asUint8List();
+    await Gal.putImageBytes(
+      imageBytes,
+      name: 'XWallpaper_share',
+      album: _albumName,
+    );
+  }
+
+  static Future<Uint8List> createTransparentImage(double aspectRatio) async {
+    double minSize = 100;
+
+    double width = minSize * aspectRatio;
+    double height = minSize;
+
+    final recorder = PictureRecorder();
+    final canvas = Canvas(
+      recorder,
+      Rect.fromLTWH(0, 0, width.toDouble(), height.toDouble()),
+    );
+    final paint = Paint()..color = Colors.transparent;
+    canvas.drawRect(
+      Rect.fromLTWH(0.0, 0.0, width.toDouble(), height.toDouble()),
+      paint,
+    );
+
+    final picture = recorder.endRecording();
+    final img = await picture.toImage(width.toInt(), height.toInt());
+    final pngBytes = await img.toByteData(format: ImageByteFormat.png);
+
+    return pngBytes!.buffer.asUint8List();
+  }
+
+  // 下载图片并返回 Uint8List（简单实现）
+  static Future<Uint8List?> fetchThumbBytes(String? url) async {
+    if (url == null || url.isEmpty) return null;
+    try {
+      final resp = await http.get(Uri.parse(url));
+      if (resp.statusCode == 200) return resp.bodyBytes;
+    } catch (_) {}
+    return null;
+  }
+}