What's the best Android app for quickly opening, viewing, managing, and annotating PDF documents on my phone or tablet?

All PDF Reader, PDF Viewer is a capable Android application designed for handling PDF documents efficiently. It allows users to quickly open and view PDF files directly from their device's storage or from cloud services. The app provides various viewing options, including single-page and continuous scrolling modes, along with zoom functionality for detailed inspection. Beyond basic viewing, it offers tools for managing PDF files, such as renaming, deleting, and organizing documents into folders. A key feature is its annotation capabilities, enabling users to highlight text, add notes, draw shapes, and insert signatures directly onto PDF pages. These annotations can be saved, making it easy to collaborate or review documents. The app supports password-protected PDFs and includes a search function to quickly find specific content within a document. With its user-friendly interface and robust feature set, All PDF Reader, PDF Viewer is a valuable tool for anyone who frequently works with PDFs on their Android device.