View Binding In Android 3.6 

Hello Su Myat WTM Ambassador Lead Android Developer @devsumyat 

Contents 1.WHY THIS TALK Because you can use ViewBindings in Android Studio 3.6 Canary11+ 2. ACCESSING VIEWS Let’s look up options what we have and evaluate them in terms of elegance, the compile time safety and the build speed impact. 3. HOW TO USE Go back findViewByID, then Data Binding and View Binding. 

Why this talk? . 

In Google IO 2019 

Now is available 

Before we go to ViewBinding, start first DataBinding 

What’s Data Binding? - Declarative UI inside XML 

What’s Data Binding? - Declarative UIs inside XML - Binding the gab between code and XML 

What’s View Binding? - New API 

View Binding? - New API - Similar Concept as DataBinding 

ViewBinding/DataBinding can provide a nice way of directly calling views by id with just initializing one variable - the binding class. 

How do we access Views on Android? . 

Let’s look up options we have? Method Elegance Compile Type Safety Build Speed 

Let’s look up options we have? Method Elegance Compile Type Safety Build Speed findViewById 

Let’s look up options we have? Method Elegance Compile Type Safety Build Speed findViewById Data Binding 

Let’s look up options we have? Method Elegance Compile Type Safety Build Speed findViewById Data Binding Butterknife 

Let’s look up options we have? Method Elegance Compile Type Safety Build Speed findViewById Data Binding Butterknife Kotlin Synthethic 

Let’s look up options we have? Method Elegance Compile Type Safety Build Speed findViewById Data Binding Butterknife Kotlin Synthethic ??? 

Let’s look up options we have? Method Elegance Compile Type Safety Build Speed findViewById Data Binding Butterknife Kotlin Synthethic View Binding 

How to use? . 

Sample App 

let’s get steps back to old 

In findVieById lateinit var likeCountTxt: TextView lateinit var likeBtn: Button override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) loveCountTxt = findViewById(R.id.txt_love_count) likeBtn = findViewById(R.id.btn_like) viewModel.likes.observe(this, Observer { likeCountTxt.text = "${it}" }) likeBtn.setOnClickListener { viewModel.onLike() } } 

In DataBinding override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) val binding : ActivityMainBinding = DataBindingUtil. setContentView(this, R.layout.activity_main) binding.lifecycleOwner = this binding.viewmodel = viewModel }

Enable in grade file android { dataBinding { enabled true } } 

In ViewBinding override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) var binding = ActivityMainBinding.inflate(layoutInflater) setContentView(binding.root) viewModel.likes.observe(this, Observer { binding.count.text = "${it}" }) binding.like.setOnClickListener { viewModel.onLike() } } 

Enable in grade file android { viewBinding { enabled = true } } 

Thank you .