Room + ViewModel + LiveData + RecyclerView (MVVM) Part 2 - ENTITY - Android Studio Tutorial

Описание

In part 2 of the Architecture Components tutorial, we will set up a new Android Studio project, add the Room and Lifecycle dependencies and then create our Note class.
By annotating this Java class with @Entity, we can let room generate all the necessary code to create an SQLite table for this object, as well as columns for all it's fields. With @PrimaryKey and autoGenerate = true, we can turn an integer member variable into an autoincrementing primary key, which we can use to uniquely identify each row in the table. In the past we would have to do all of this in an SQLiteOpenHelper with plain SQL statements.
Lastly we create a constructor, getters and setters and then Room takes care of creating all the boilerplate code at runtime. We can also specify the tableName if it should be different than the class name.
There are some more annotations and settings, like @Ignore and @ColumnInfo, which you can learn more about in the documentation below.

Watch the whole playlist:
https://www.youtube.com/playlist?list=PLrnPJCHvNZuDihTpkRs6SpZhqgBqPU118

“Adding Components” page with dependencies & instructions:
https://developer.android.com/topic/libraries/architecture/adding-components

CardView & Design Support Library dependencies:
https://developer.android.com/topic/libraries/support-library/package #v7-cardview
https://developer.android.com/topic/libraries/support-library/package #design

Example code for this part:
https://gist.github.com/codinginflow/791a6df9638438ddc5046b9af1dfbc5e

AndroidX refactoring table:
https://developer.android.com/topic/libraries/support-library/refactor

Entity documentation:
https://developer.android.com/training/data-storage/room/defining-data

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