Android Room Livedata Tutorial

This cache which serves as your app s single source of truth allows users to view a consistent copy of key information within your app. If you want to modify the database do have a look at migration. The room persistence library provides an abstraction layer over sqlite to allow for more robust database access while harnessing the full power of sqlite.

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Livedata is an observable data holder part of the android jetpack.

Android room livedata tutorial.

The library helps you create a cache of your app s data on a device that s running your app. When room queries return livedata the queries are automatically run asynchronously on a background thread. Android room with livedata example tutorial. Live data livedata class is from lifecycle library for observing the data changes.

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 n. By default to avoid poor ui performance room doesn t allow you to issue queries on the main thread. You can use livedata independently from room but to do so you must manage data updates. If you are new to android application development or you have been working with android then you will be familiar with sqlite which is an inbuilt local database for android.

It s an observable data holder class and it is also lifecycle aware. Room takes care of mundane tasks that you used to handle with an sqliteopenhelper. Here is the video from android developers channel. Room uses the dao to issue queries to its database.

However livedata has no publicly available methods to update the stored data. For this we. In part 6 of the architecture components tutorial we will set up a recyclerview to display the entries from our database table in our activity. Here we have a room class notedatabase in which we had to declare all our entities and version of the database getinstance method will return the room database instance.

Android room with livedata example tutorial. Livedata is an observable data holder class. Therefore if you want to update the stored data you must use mutablelivedata instead of livedata the mutablelivedata class adds two public methods that allow you to set the value of a livedata object.

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