0.4.0

As of 14 December 2020, Kotlin synthetics is deprecated and no longer supported. So we migrate our codebase to using ViewBinding. As of why, there's a few problem for using Kotlin synthetics, such as:

• They expose a global namespace of ids that’s unrelated to the layout that’s actually inflated with no checks against invalid lookups
• They are Kotlin only
• They don’t expose nullability when views are only present in some configuration
• All together, these issues cause the API to increase number of crashes for Android apps
• Also Google is promoting modularisation but synthetic properties don’t work cross-module

Since version 0.3.3 we migrate to viewBinding, so how do we migrate our code? Let's just start simple by enabling viewBinding in our app build.gradle:

// we don't use this anymore
// apply plugin: 'kotlin-android-extensions'

android {
// Add this
  buildFeatures {
     viewBinding true
  }
}

Activity and Fragment¶

When using this codebase, use DevActivity and DevFragment. For example, assume we have class named SampleActivity with its' layout file named activity_sample.xml. so how do we define that now using viewBinding, let's take a look:

//  Now you need to add binding between < and >
class SampleActivity : DevActivity<ActivitySampleBinding>() { 

//   We no longer use it anymore, cause we will use binding
//   override val layoutResource = R.layout.activity_sample

//   Other override methods
     override fun initAction(){}
     override fun initData(){}
     override fun initObserver(){}
     override fun initUI(){}
}

Now, onto how we call our View. Just add binding before View id:

// with Kotlin synthetics
tvName.text = "your name"

// with viewBinding
binding.tvName.text = "your name"

RecyclerView ViewHolder and Adapter¶

For ViewHolder, now the parameter constructor it's not a View anymore but layout binding:

// No longer supported
class SampleHolder(itemView : View) : DevItemViewHolder<Sample>(itemView)

// This is the way
// Add private val before the variable name and change it to the layout binding
class SampleHolder(private val binding : ItemSampleBinding) DevItemViewHolder<Sample>(binding)

Inside the ViewHolder class, call the View by adding binding before its' id:

binding.tvName.text = "the user name"

Henceforth, for Adapter... no need to define the layout resource id in getResourceLayout method. Change ViewHolder initialization in onCreateViewHolder method:

override fun onCreateViewHolder(parent : ViewGroup, viewType : Int) = 
    SampleHolder(ItemUserBinding.inflate(getLayoutInflater(parent)))