Active reading is crucial for the acquisition of information and the comprehension of literature. However, existing digital media still encounter several challenges in facilitating active reading, such as the limited contextual space caused by constrained screen size, which hinders effective information integration. Furthermore, the rationality of the layout of various types of literature resources also significantly influences the coherence of the reading experience. To address these challenges, we propose DocVision, a seamless, cross-device immersive active reading framework. To reduce the difficulty of information integration, DocVision incorporates a lightweight resource acquisition framework, which seamlessly integrates resources such as diagrams and literature references into the mixed reality (MR) environment. Furthermore, we propose a dynamic layout method for MR to improve reading continuity in multi-resource contexts. Experimental results demonstrate that DocVision substantially enhances the coherence of readers' reading experience and significantly alleviates cognitive load, offering valuable insights for developing future active reading approaches based on digital media.