1. TutorialsPoint : https://www.tutorialspoint.com/android/index.htm
2. GeeksforGeeks : https://www.geeksforgeeks.org/android-tutorial/?ref=footer
3. AbhiAndroid : https://abhiandroid.com/
4. JavatPoint : https://www.javatpoint.com/android-tutorial
5. StudyTonight : https://www.studytonight.com/android/introduction-to-android
6. Tutlane : https://www.tutlane.com/tutorial/android/android-listview-with-examples
7. o7Planning. : https://o7planning.org/
8. AndroidKnowledge. : https://androidknowledge.com/android/