152 lines
4.3 KiB
Dart
152 lines
4.3 KiB
Dart
import 'dart:async';
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import 'dart:io';
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import 'dart:ui' as ui;
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import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart';
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import 'package:flutter/scheduler.dart';
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import 'package:image_gallery_saver/image_gallery_saver.dart';
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import 'package:permission_handler/permission_handler.dart';
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class ImageSaveService {
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/// 保存图片到相册 - 改进版本，避免 debugNeedsPaint 错误
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static Future<bool> saveImageToGallery(
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GlobalKey repaintBoundaryKey, {
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String? fileName,
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}) async {
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try {
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// 1. 检查权限
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final hasPermission = await _requestPermission();
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if (!hasPermission) {
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debugPrint('没有相册访问权限');
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return false;
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}
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// 2. 使用调度器确保在正确的时机捕获
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final completer = Completer<bool>();
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SchedulerBinding.instance.addPostFrameCallback((_) async {
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try {
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// 额外等待确保所有绘制完成
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await Future.delayed(const Duration(milliseconds: 100));
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final result = await _captureAndSave(repaintBoundaryKey, fileName);
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completer.complete(result);
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} catch (e) {
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debugPrint('捕获图片失败: $e');
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completer.complete(false);
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}
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});
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return await completer.future;
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} catch (e) {
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debugPrint('保存图片失败: $e');
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return false;
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}
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}
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/// 内部方法：捕获并保存图片
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static Future<bool> _captureAndSave(
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GlobalKey repaintBoundaryKey,
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String? fileName,
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) async {
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try {
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// 获取 RepaintBoundary
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final boundary =
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repaintBoundaryKey.currentContext?.findRenderObject()
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as RenderRepaintBoundary?;
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if (boundary == null) {
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debugPrint('无法获取RepaintBoundary');
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return false;
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}
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// 多次尝试捕获，避免绘制冲突
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ui.Image? image;
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int attempts = 0;
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const maxAttempts = 5;
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while (attempts < maxAttempts) {
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try {
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// 检查是否正在绘制
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if (boundary.debugNeedsPaint) {
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debugPrint(
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'RepaintBoundary 正在绘制中，等待... (尝试 ${attempts + 1}/$maxAttempts)',
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);
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await Future.delayed(Duration(milliseconds: 200 * (attempts + 1)));
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attempts++;
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continue;
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}
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// 尝试捕获图片
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image = await boundary.toImage(pixelRatio: 3.0);
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break;
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} catch (e) {
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debugPrint('捕获尝试 ${attempts + 1} 失败: $e');
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attempts++;
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if (attempts < maxAttempts) {
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await Future.delayed(Duration(milliseconds: 300 * attempts));
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}
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}
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}
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if (image == null) {
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debugPrint('所有捕获尝试都失败了');
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return false;
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}
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// 转换为字节数据
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final byteData = await image.toByteData(format: ui.ImageByteFormat.png);
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if (byteData == null) {
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debugPrint('无法转换图片数据');
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return false;
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}
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final pngBytes = byteData.buffer.asUint8List();
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// 保存到相册
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final result = await ImageGallerySaver.saveImage(
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pngBytes,
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name: fileName ?? 'MoodCanvas_${DateTime.now().millisecondsSinceEpoch}',
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quality: 100,
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);
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debugPrint('保存结果: $result');
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return result['isSuccess'] == true;
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} catch (e) {
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debugPrint('_captureAndSave 失败: $e');
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return false;
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}
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}
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/// 请求相册访问权限
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static Future<bool> _requestPermission() async {
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if (Platform.isIOS) {
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// iOS 14+ 需要 photos 权限
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final status = await Permission.photos.request();
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return status.isGranted;
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} else if (Platform.isAndroid) {
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// Android 需要存储权限
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final status = await Permission.storage.request();
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return status.isGranted;
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}
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return false;
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}
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/// 检查权限状态
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static Future<bool> checkPermission() async {
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if (Platform.isIOS) {
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final status = await Permission.photos.status;
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return status.isGranted;
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} else if (Platform.isAndroid) {
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final status = await Permission.storage.status;
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return status.isGranted;
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}
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return false;
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}
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/// 打开应用设置页面
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static Future<void> openSettings() async {
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await openAppSettings();
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}
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}
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