Flutter|Flutter 计算App应用缓存及清除应用缓存
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
import 'dart:io';
import 'package:path_provider/path_provider.dart';
// 加载缓存
Future loadCache() async {
Directory tempDir = await getTemporaryDirectory();
double value = https://www.it610.com/article/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 _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 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 _delDir(FileSystemEntity file) async {
if (file is Directory) {
final List 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 unitArr = List()
..add('B')
..add('K')
..add('M')
..add('G');
int index = 0;
while (value > 1024) {
index++;
value = https://www.it610.com/article/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';
@override
void initState() {
// TODO: implement initState
super.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 imagein memory
void clearMemoryImageCache() {
PaintingBinding.instance.imageCache.clear();
}// get ImageCache
void getMemoryImageCache() {
PaintingBinding.instance.imageCache;
}
注意：
【Flutter|Flutter 计算App应用缓存及清除应用缓存】Future 要想获取其中的内容，前面必须+await 才可以，否则会报错
