Check If File Already Exists In Webview Cache Android

In my app I have an activity with a webview wich loads different images. Before loading the webview, I need to know if the image is already cached in the webview cache. I've found

Solution 1:

Finally I've found a workaround. I save what I need manually in my app cache directory, and when I have to load it again I check if it is inside that directory. That solution works on all android versions.