2 4 android architecture libraries runtime

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sure! android architecture components help developers build robust, maintainable, and testable apps. the architecture libraries provided by android include components like livedata, viewmodel, room, etc. in this tutorial, we’ll focus on the following two key components:

1. **viewmodel**: this component is designed to store and manage ui-related data in a lifecycle-conscious way. it allows data to survive configuration changes like screen rotations.

2. **livedata**: this is a lifecycle-aware observable data holder. livedata allows ui components to observe changes in the data, so they can update automatically.

setting up your android project

before we dive into the code, ensure you have the necessary dependencies in your `build.gradle` file:

```groovy
dependencies {
// androidx lifecycle
implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.6.1"
implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.6.1"
}
```

step 1: create the viewmodel

first, you will create a viewmodel to hold your ui-related data. the viewmodel survives configuration changes, and it can hold data that the ui needs.

```kotlin
import androidx.lifecycle.livedata
import androidx.lifecycle.mutablelivedata
import androidx.lifecycle.viewmodel

class mainviewmodel : viewmodel() {

// backing property for the livedata
private val _message = mutablelivedatastring()

// public livedata to be observed
val message: livedatastring get() = _message

init {
// set initial message
_message.value = "hello, world!"
}

// function to update the message
fun updatemessage(newmessage: string) {
_message.value = newmessage
}
}
```

step 2: create the activity

next, you will create an activity that uses the viewmodel. the activity will observe changes in the livedata and update the ui accordingly.

```kotlin
import android.os.bundle
import androidx.activity.viewmodels
import androidx.appcompat.app.appcompatactivity
imp ...

#AndroidArchitecture #AndroidLibraries #windows
Android architecture
2 4 architecture
Android libraries
runtime libraries
MVVM architecture
LiveData
Room database
ViewModel
Data Binding
Dependency Injection
Retrofit
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Jetpack components
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Kotlin extensions