Google released the official Android application for the Google AdSense users.
It is not compatible with all devices, As you can see in the below screenshot, this application is compatible with my Samsung Galaxy S2 while it is not with Samsung Galaxy S4.
The Google AdSense app provides an easy way to access key data from your AdSense account. Access reporting features anywhere, directly from your mobile phone. The first version of the app gives you access to: the key earnings information, top custom and URL channels, ad units and sites reports, payment alerts.
Get it from play store
If your device is not supported you can try downloading the APK and install it. from here