I can provide some insights on the most popular educational apps for Android in 2022 based on the trends of the past few years.

• Duolingo: Duolingo has consistently been one of the most popular educational apps on Android, offering language learning courses in more than 30 languages. The app uses gamification to make language learning fun and engaging.

• Khan Academy: Khan Academy is a non-profit organization that provides free educational resources in a wide range of subjects, including math, science, and history. The app offers video lessons and interactive exercises to help students learn at their own pace.

• Coursera: Coursera is an online learning platform that offers courses from top universities and institutions around the world. The app allows users to enroll in courses and access course materials, including videos, readings, and quizzes.

• Quizlet: Quizlet is a study app that allows users to create digital flashcards and quizzes to help them learn and memorize information. The app offers a variety of study modes, including matching games and tests.

• Google Classroom: Google Classroom is a learning management system that allows teachers to create and manage classes online. The app offers tools for communication, assignment distribution, and grading.

• edX: edX is an online learning platform that offers courses from top universities and institutions around the world. The app allows users to enroll in courses and access course materials, including videos, readings, and quizzes.

• Photomath: Photomath is a math solver app that uses the camera on a smartphone or tablet to scan and solve math problems. The app provides step-by-step explanations for each problem, making it a useful tool for students struggling with math.

• Rosetta Stone: Rosetta Stone is a language learning app that offers courses in 24 different languages. The app uses a combination of images, audio, and text to help users learn a new language.

• Memories: Memories is a language learning app that uses gamification to make language learning fun and engaging. The app offers courses in a variety of languages and allows users to track their progress and compete with others.

• Udemy: Udemy is an online learning platform that offers courses in a wide range of subjects, including business, IT, and personal development. The app allows users to enroll in courses and access course materials, including videos, readings, and quizzes.