How to migrate to Room database from an older API?

To migrate to Room database from an older API in an Android application, follow these steps to ensure a smooth transition and take advantage of Room's persistence features.

Step-by-step Migration Guide

1. Assess Your Current Database API: Review your existing database implementation (e.g., SQLite, Realm) to understand its structure and usage.
2. Add Room Dependencies: Update your app's build.gradle file to include Room dependencies:

   implementation "androidx.room:room-runtime:2.5.0"
   annotationProcessor "androidx.room:room-compiler:2.5.0" // For Java
   kapt "androidx.room:room-compiler:2.5.0" // For Kotlin

3. Create Entity Classes: Convert your existing database tables into Room entity classes. Each class corresponds to a table, with fields mapping to columns.
4. Define DAO Interfaces: Create Data Access Object (DAO) interfaces for each entity class. These interfaces define the methods to interact with the database.
5. Set Up the Database: Create a RoomDatabase class that extends RoomDatabase and includes the entities and DAOs.
6. Update Repository Pattern: If you're using a repository pattern, update it to use the new Room database instead of the previous API.
7. Migrate Existing Data: If you have existing data in your old database, write migration scripts to transfer this data to Room.
8. Test Your Implementation: Thoroughly test your new implementation to ensure that all functionalities work as expected.