Accessing basic data on installed Apps

I'm fairly new to Android/Java and wanted to make an app that displays info on the installed apps on a device.

I've successfully used resolveInfo to get an app list as described he开发者_运维百科re.

But I was interested in determining things like the app category, current cache size, or last time the app was used. I thought I could access this using /data/data/, but I guess I can't do that due to security issues.

Any coding magic that can get this kind of information?

app category

That is an Android Market concept and does not exist in the Android OS.

current cache size

I suspect that is not available to SDK applications.

last time the app was used

I am not even sure that is tracked.

I thought I could access this using /data/data/, but I guess I can't do that due to security issues.

Correct.