Methods and mobile devices for providing various eco-friendly User Interfaces (UIs) are provided. In one method for providing the eco-friendly UI, the mobile device measures a recharging amount or time, displays the recharging amount or time, and determines whether the recharging amount or time is more than a predefined critical amount or time. If the recharging amount or time is more than the critical amount or time, the mobile device is transitioned into an executable state of a specific application. This may give a user motivation to use a solar charge system and thereby reduce battery consumption of the mobile device.