ViewBindingAnnotations

This is a small library that will simplify the viewBinding usage.
It will be helpful for large projects or just to avoid binding initialization in every activity/fragment via using the generics and passing the binding class to your BaseActivity/BaseFragment class.

Install

Gradle Dependency (Module level)

Since it uses the AnnotationProcessor under the hood you need to add kapt:

plugins {
    ...
    id 'kotlin-kapt'
}

Enable the viewBinging, of course:

android {
    ...
    buildFeatures {
        viewBinding true
    }
}

And add the dependency:

dependencies {
    ...
    implementation 'com.github.Kobanister:ViewBindingAnnotations:$latestVersion'
    kapt 'com.github.Kobanister:ViewBindingAnnotations:$latestVersion'
}

Usage

The library contains annotations for fragment (@BindFragment) and activity (@BindActivity).

Activity usage

  1. Add @BindActivity annotation to you Activity class:

@BindActivity
class MainActivity : BaseActivity<ActivityMainBinding>() {}
  1. Add the logic to the BaseActivity:

    private var _binding: VB? = null
    open val binding: VB
        get() = _binding ?: throw Throwable("Binding must not be null")

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        ...
        this._binding = BindingFactory.getBinding(this, null)
        setContentView(binding.root)
    }
  1. You are ready to use the binding in your Activity:
    binding.tvTitle.text = "Hello Binding! (From Activity)"

Fragment usage

  1. Add @BindFragment annotation to you Fragment class:

@BindFragment
class MainFragment : BaseFragment<FragmentMainBinding>() {}
  1. Add the logic to the BaseFragment:

    private var _binding: VB? = null
    protected open val binding: VB
        get() = _binding ?: throw Throwable("Binding must not be null")

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        ...
        this._binding = BindingFactory.getBinding(this, container)
        return binding.root
    }

    override fun onDestroyView() {
        ...
        _binding = null
        super.onDestroyView()
    }
  1. You are ready to use the binding in your Fragment:
    binding.tvTitle.text = "Hello Binding! (From Fragment)"

TODO LIST

  • Add extensions for the DialogFragment and RecyclerView.ViewHolder

Honorable mentions

Many thanks to @aengussong for helping me out ?

License

Please see LICENSE

GitHub

View Github