The exponential growth of Android smartphone usage has elevated the relevance of Android-focused mobile forensics in both criminal investigations and cybersecurity domains. This paper presents a systematic literature review (SLR) of methodologies, tools, and challenges associated with forensic investigations of Android applications. The review synthesizes current practices in data acquisition and evaluates the performance of widely used forensic tools, while also discussing emerging trends and critical limitations. This study aims to provide a comprehensive reference for practitioners and researchers, to highlight best practices, and to propose future directions to enhance reliability, reproducibility, and legal defensibility in Android forensic investigations.