This is the feature I need to say that avast! Mobile Security is THE app for Android.
I want to lock certain apps with a PIN or a pattern, so I have to enter the PIN or pattern if I want to access restricted features. A very good app for Android which has similar functionality is
App Lock, but App Lock is veeery badly translated.
If this is possible I also want to lock just certain features and not the whole app. For example, you could browse the Play Store without a PIN/pattern, but if you want to install or uninstall apps you'd have to enter the PIN. The Android app
Protector has this feature, but does only work with Android 2.3.6 max.