Requires Android 2.1 or higher
Need a rooted device
AdWai is an ad-blocking tool that shows you a pop-up that is browsing on your Android device. The app also allows you to select host files from your device.
With this type of application, with adAway, you can create a 'whitelist' of websites that you can add an exception if you want. Of course, if you can add more hosts to your blacklist, but it does not matter what you want to do, all settings can be configured according to your preferences.
It is important for you to use AdWare, you will need a rooted device. If you do not have your Android device, you can not access all the features described above. To solve it, however, you can always download an app like UwTodown from Towelroot.
AdAway is a great tool for blocking ads and is not available through Google Play (or perhaps due to this), but it has lots of features plus its user interface is easy, convenient and easy to set up.