code: public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) {
  		if (AbstractDataSource.this.options.databaseLifecycleHandler != null) {
  			AbstractDataSource.this.options.databaseLifecycleHandler.onUpdate(db, oldVersion, newVersion, false);
  			versionChanged = true;
  		}
  	}
docs: On downgrade.
  
  @param db
  the db
  @param oldVersion
  the old version
  @param newVersion
  the new version