BindingExtension

ViewBinding is an amazing tool for Android but it's not so fit in Android development as we still have to do some config. BindingExtension is built to provide a simpler usage.

Install

Add Jitpack repository to your root build.grable:

allprojects {
  repositories {
    ...
    maven { url 'https://jitpack.io' }
  }
}

Then add dependency in your module build.gradle:

dependencies {
  implementation 'com.github.jintin:BindingExtension:3.1.0'
}

Usage

First of all, BindingExtension using refelction a lot to link many things internally in order to provide simple usage. To prevent having trouble with proguard, please remember to exclude ViewBinding related method in your proguard-rules file like this:

-keepclassmembers class * implements androidx.viewbinding.ViewBinding {
     public static ** inflate(...);
}

Activity

Extend from BindingActivity with your ViewBinding type then you can use binding directly after calling super.onCreate(savedInstanceState) and you don't have to call setContentView anymore:

class MainActivity : BindingActivity<ActivityMainBinding>() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding.label.setText(R.string.activity_label)
    }
}

Fragment

Extend from BindingFragment with your ViewBinding type then you can use binding directly after super.onCreateView(inflater, container, savedInstanceState) is called:

class MainFragment : BindingFragment<FragmentMainBinding>() {

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        binding.button.setOnClickListener {
            binding.button.setText(R.string.fragment_label)
        }
    }
}

ViewHolder

BindingExtension provide an extension function for ViewGroup, you can call ViewGroup.toBinding() in onCreateViewHolder to get your desire type of ViewBinding. And ViewHolder can than access ViewBinding directly without further transformation.

// inside adapter
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
    return MainViewHolder(parent.toBinding())
}

// ViewHolder
class MainViewHolder(private val binding: AdapterMainBinding) :
    RecyclerView.ViewHolder(binding.root) {

    fun bind(data: String) {
        binding.name.text = data
    }
}

You can go to ./app module for more information.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/Jintin/BindingExtension.