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ic交易网站建设,推广公众号,保定网站建设价格,我怎么自己创建微信公众号整体思路通过 path_provider插件获取getTemporaryDirectory路径循环计算文件的大小（递归）递归方式删除目录计算大小渲染 1.计算App应用缓存 import dart:io; import package:path_provider/path_provider.dart;// 加载缓存Future<String> loadCa…

整体思路

通过 path_provider插件获取getTemporaryDirectory路径
循环计算文件的大小（递归）
递归方式删除目录
计算大小
渲染

1.计算App应用缓存

import 'dart:io';
import 'package:path_provider/path_provider.dart';// 加载缓存Future<String> loadCache() async {Directory tempDir = await getTemporaryDirectory();double value = await _getTotalSizeOfFilesInDir(tempDir);/*tempDir.list(followLinks: false,recursive: true).listen((file){//打印每个缓存文件的路径print(file.path);});*/print('临时目录大小: ' + value.toString());return  _renderSize(value);}// 循环计算文件的大小（递归）Future<double> _getTotalSizeOfFilesInDir(final FileSystemEntity file) async {if (file is File) {int length = await file.length();return double.parse(length.toString());}if (file is Directory) {final List<FileSystemEntity> children = file.listSync();double total = 0;if (children != null)for (final FileSystemEntity child in children)total += await _getTotalSizeOfFilesInDir(child);return total;}return 0;}// 递归方式删除目录Future<Null> _delDir(FileSystemEntity file) async {if (file is Directory) {final List<FileSystemEntity> children = file.listSync();for (final FileSystemEntity child in children) {await _delDir(child);}}await file.delete();}// 计算大小_renderSize(double value) {if (null == value) {return 0;}List<String> unitArr = List()..add('B')..add('K')..add('M')..add('G');int index = 0;while (value > 1024) {index++;value = value / 1024;}String size = value.toStringAsFixed(2);if (size ==  '0.00'){return '0M';}// print('size:${size == 0}\n ==SIZE${size}');return size + unitArr[index];}

2.清除App缓存

/// 清理缓存
///
void _clearCache() async {Directory tempDir = await getTemporaryDirectory();//删除缓存目录await _delDir(tempDir);await loadCache();Toast.show('清除缓存成功');
}

3.渲染文字(使用)

 String _cacheSizeStr = '0';@overridevoid initState() {// TODO: implement initStatesuper.initState();getCount();}void getCount() async{_cacheSizeStr  = await loadCache();print('===cacheSize大小：${_cacheSizeStr}');setState(() {});}

补充

1.清理和获取图片缓存

 /// 清理内存://clear all of image  in memoryvoid clearMemoryImageCache() {PaintingBinding.instance.imageCache.clear();}// get ImageCachevoid getMemoryImageCache() {PaintingBinding.instance.imageCache;}

注意：