Room cannot verify the data integrity

Question

I am getting this error while running program with Room Database

Room cannot verify the data integrity. Looks like you\'ve changed schema but forgot to updat         


        

Answer 1

By default Android manifest have android:allowBackup="true", Which allow apps to persist their SQLite DB on reinstallation.

Suppose your DATABASE_VERSION was initially 3 and then you decide to reduce DB version from 3 to 1.

@Database(entities = {CallRecording.class}, version = DATABASE_VERSION)
public abstract class AppDatabase extends RoomDatabase {
    public abstract RecordingDAO recordingDAO();

//    static final Migration MIGRATION_1_2 = new Migration(1, 2) {
//        @Override
//        public void migrate(SupportSQLiteDatabase database) {
//            // Since we didn't alter the table, there's nothing else to do here.
//        }
//    };
}

You can achieve it like this

• Clear App data from Setting. This will remove older DB(DATABASE_VERSION =3)from phone
• Uninstall your App
• Reduce DATABASE_VERSION version to 1
• Build and Reinstall Your App

Its a good practise to keep DATABASE_VERSION as constant.