ActivityViewModels

ActivityViewModels is a library for Android that simplifies the creation and management of ViewModel instances for Activities.

Introduction

In Android, ViewModel is an entity that stores and manages UI-related data. However, creating and managing ViewModel instances in Activities can be a tedious and error-prone task. ActivityViewModels library provides a solution to this problem by simplifying the creation and management of ViewModel instances, reducing boilerplate code and improving readability.

Features

ActivityViewModels library provides the following features:

• Automatic ViewModel creation: ActivityViewModels library automatically creates ViewModel instances for Activities based on their type, without the need for manual instantiation.

• Lifecycle-aware ViewModel: ViewModel instances created by ActivityViewModels library are automatically bound to the lifecycle of the corresponding Activity, ensuring proper memory management and preventing memory leaks.

• Singleton ViewModel: ActivityViewModels library creates a single instance of each ViewModel for an Activity, ensuring that the same instance is used across configuration changes and other lifecycle events.

How to use

To use ActivityViewModels library in your Android project:

1. Add the following code to the build.gradle file of your app module:

implementation 'androidx.activity:activity-ktx:1.3.0'
implementation 'androidx.fragment:fragment-ktx:1.3.0'
implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1'

2. Create a ViewModel class for your Activity by extending the ViewModel class:

class MyViewModel : ViewModel() {
    // Your ViewModel code here
}

3. In your Activity class, use the by viewModels() syntax to retrieve the ViewModel instance:

class MyActivity : AppCompatActivity() {
    private val viewModel: MyViewModel by viewModels()

    // Your Activity code here
}

That's it! ActivityViewModels library will automatically create and manage the MyViewModel instance for your MyActivity class.

Conclusion

ActivityViewModels library simplifies the creation and management of ViewModel instances for Activities in Android. By reducing boilerplate code and improving readability, it makes code maintenance and refactoring easier. Try it out in your Android project today!