Flutter清理图片缓存以及进制之间转换

Flutter清理图片缓存以及进制之间转换

图像缓存是在启动时由绘图绑定创建的。createImageCache方法

• 获取图片缓存

ImageCache get imageData => PaintingBinding.instance.imageCache;

• 获取图片缓存大小

int byteData=imageData .currentSizeBytes

获取到的缓存是byte大小，如果用于显示我们可以根据自己实际情况进行转换

1Byte = 8 Bit 
1KB   = 1,024 Bytes
1MB   = 1,024 KB = 1,048,576 Bytes
1GB   = 1,024 MB = 1,048,576 KB = 1,073,741,824 Bytes 1GB  = 1,024 MB = 1,048,576 KB = 1,073,741,824 Bytes
1TB   = 1,024 GB = 1,048,576 MB = 1,099,511,627,776 Bytes
1PB   = 1,024 TB = 1,048,576 GB =1,125,899,906,842,624 Bytes
1EB   = 1,024 PB = 1,048,576 TB = 1,152,921,504,606,846,976 Bytes
1ZB   = 1,024 EB = 1,180,591,620,717,411,303,424 Bytes
1YB   = 1,024 ZB = 1,208,925,819,614,629,174,706,176 Bytes

• 清理缓存

imageData.clear();

• （附带）获取缓存图片数量

int allNum = imageData.currentSize;

• （附带）设置缓存大小

imageData.maximumSizeBytes=50<<20;（按照自己实际情况设置，depthData = 50M）