Mobile ecosystems are generally long-lived and sometimes operate in inaccessible areas, so they require support for self-adaptation to the continuous context changes. Dynamic Software Product Lines (DSPLs) produce software products capable of adapting to requirements that change at runtime. We propose a DSPL-based self-adaptation process especially designed for mobile system requirements, such as context and device heterogeneity. We follow a lightweight email@example.com approach, by using variability models to generate, at runtime, the products adapted to the context changes, but without loading the models in the mobile devices. In addition, our approach takes into account the quality-of-service as part of the decision making process.