问题
In my flutter application,I have uploaded 3 imageUrls and 2 PDFUrls to firebase database and firebase storage already.Now How to do caching of imageUrls and PDFUrls.(Permannent caching untill deletion)
Actually I want to do caching as I want to download the images and pdfs in the application with the click on the image and pdf icon or picture with in the application itself.
Image should be opened default image opener and pdf should be opned either in a webview or browser.
I have already recieved all the Urls for the above.
来源：https://stackoverflow.com/questions/65476260/in-my-flutter-application-i-have-uploaded-3-imageurls-and-2-pdfurls-to-firebase