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Simple one-liner ViewBinding in Fragments and Activities with Kotlin 🍄 Simplify usage of Android View Binding with Kotlin Property Delegates and solve behavior of Fragment’s ViewLifecycleOwner 🌱 ViewBindingPropertyDelegate

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Kotlin-Android-Open-Source/ViewBindingDelegate

 
 

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  • Simplify usage of Android View Binding with Kotlin Property Delegates and solve behavior of Fragment’s ViewLifecycleOwner.
  • Simple one-liner ViewBinding in Fragments and Activities with Kotlin.
  • Lightweight and simple library.

MonthWeekAndroid TestsAndroid build CIJitpackGitHubktlintKotlinAPIHits

Medium article

ReadViewBinding Delegate — one line to get details about implementation.

Getting Started

1. Add the JitPack repository to your build file

Add it in your root build.gradle at the end of repositories:

  • Kotlin
allprojects {  repositories {...    maven(url="https://jitpack.io")  }}
  • Groovy
allprojects {  repositories {...    maven { url'https://jitpack.io' }  }}

2. Add the dependency

dependencies {  implementation("com.github.hoc081098:ViewBindingDelegate:1.3.1")}

3. Enable ViewBinding

https://developer.android.com/topic/libraries/view-binding#setup

Usage

importcom.hoc081098.viewbindingdelegate.*

1. Activity (with reflection).See example

Click to expand
classMainActivity :AppCompatActivity(R.layout.activity_main) {privateval viewBinding by viewBinding<ActivityMainBinding>()overridefunonCreate(savedInstanceState:Bundle?) {super.onCreate(savedInstanceState)        viewBinding.button.setOnClickListener {      startActivity(Intent(this@MainActivity,SecondActivity::class.java))    }  }}

2. Activity (without reflection): Pass::bind method reference.See example

Click to expand
classSecondActivity :AppCompatActivity(R.layout.activity_second) {privateval binding by viewBinding(ActivitySecondBinding::bind)overridefunonCreate(savedInstanceState:Bundle?) {super.onCreate(savedInstanceState)    binding.root  }}

3. Fragment (with reflection).See example

Click to expand
classFirstFragment :Fragment(R.layout.fragment_first) {privateval binding by viewBinding<FragmentFirstBinding> {    button.setOnClickListener(null)  }overridefunonViewCreated(view:View,savedInstanceState:Bundle?) {super.onViewCreated(view, savedInstanceState)    binding.button.setOnClickListener {      findNavController().navigate(R.id.actionFirstFragmentToSecondFragment)    }  }}

4. Fragment (without reflection): Pass::bind method reference.See example

Click to expand
classSecondFragment :Fragment(R.layout.fragment_second) {privateval binding by viewBinding(FragmentSecondBinding::bind)overridefunonViewCreated(view:View,savedInstanceState:Bundle?) {super.onViewCreated(view, savedInstanceState)    binding.root  }}

5. Includes<merge/> tag layout: Create 2ViewBinding property.See example

Click to expand
classThirdFragment :Fragment(R.layout.fragment_third) {privateval includeBinding by viewBinding<FragmentThirdIncludeBinding>()privateval binding by viewBinding<FragmentThirdBinding> { buttonThird.setOnClickListener(null) }overridefunonViewCreated(view:View,savedInstanceState:Bundle?) {super.onViewCreated(view, savedInstanceState)    includeBinding.textViewThirdInclude.text="Working..."    binding.buttonThird.setOnClickListener {Toast.makeText(requireContext(),"Clicked",Toast.LENGTH_SHORT).show()    }  }}

6. TheDialog ofDialogFragmentSee example

ExtendsDefaultViewBindingDialogFragment or implementsViewBindingDialogFragment.

Click to expand
classDemoDialogFragment :DefaultViewBindingDialogFragment() {privateval viewBinding by dialogFragmentViewBinding(R.id.root,DialogFragmentDemoBinding::bind)privateval viewBinding2 by dialogFragmentViewBinding<DialogFragmentDemoBinding>(R.id.root)overridefunonCreateDialog(savedInstanceState:Bundle?):Dialog {returnAlertDialog.Builder(requireContext())      .setTitle("Demo dialog")      .setNegativeButton("Cancel") { _, _-> }      .setPositiveButton("OK") { _, _-> }      .setView(R.layout.dialog_fragment_demo)      .create()  }overridefunonResume() {super.onResume()    viewBinding.textInputLayout    viewBinding2.textInputLayout  }}

7.inflateViewBinding extension methods onViewGroup/LayoutInflater/Context.See example

Can be used inRecyclerView.Adapter # onCreateViewHolder to easily create aRecyclerView.ViewHolder with aViewBinding.

Click to expand
importcom.hoc081098.viewbindingdelegate.inflateViewBindingclassDemoAdapter :ListAdapter<String,DemoAdapter.VH>(...) {overridefunonCreateViewHolder(parent:ViewGroup,viewType:Int)=VH(parent inflateViewBindingfalse)overridefunonBindViewHolder(holder:VH,position:Int)= holder.bind(getItem(position))classVH(privatevalbinding:ItemRecyclerBinding) : RecyclerView.ViewHolder(binding.root) {funbind(item:String) {... }  }}

Note

1. Activity

MustsetContentView before accessViewBinding property. This can be done easily withconstructor:

publicAppCompatActivity(@LayoutResintcontentLayoutId) { ... }
classMainActivity :AppCompatActivity(R.layout.activity_main) {... }

2. Fragment

Fragment'sView must be not null before accessViewBinding property. This can be done easily withconstructor:

publicFragment(@LayoutResintcontentLayoutId) { ... }
classFirstFragment :Fragment(R.layout.fragment_first) {... }

3. Proguard

If there is any problem withProguard, add below to yourapp/proguard-rules.pro:

# ViewBindingDelegate uses Reflection.-keepclassmembers class ** implements androidx.viewbinding.ViewBinding {    public static ** bind(android.view.View);    public static ** inflate(android.view.LayoutInflater, android.view.ViewGroup, boolean);    public static ** inflate(android.view.LayoutInflater, android.view.ViewGroup);}

4. ThrowsIllegalStateException: "Attempt to get view binding when fragment view is destroyed" when accessing delegate property inonDestroyView

Since version1.0.0-alpha03 - Feb 16, 2021, we cannot access ViewBinding delegate property inonDestroyView (this causes many problems). Recommended way is passing a lambda toonDestroyView: (T.() -> Unit)? = null parameter of extension functions, eg.

- private val binding by viewBinding<FragmentFirstBinding>()+ private val binding by viewBinding<FragmentFirstBinding> { /*this: FragmentFirstBinding*/+   button.setOnClickListener(null)+   recyclerView.adapter = null+ }   override fun onDestroyView() {    super.onDestroyView()-   binding.button.setOnClickListener(null)-   binding.recyclerView.adapter = null  }

5. Min SDK version

Since version1.2.0,minSdkVersion has been changed to14.

License

MIT LicenseCopyright (c) 2020-2021 Petrus Nguyễn Thái Học

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Simple one-liner ViewBinding in Fragments and Activities with Kotlin 🍄 Simplify usage of Android View Binding with Kotlin Property Delegates and solve behavior of Fragment’s ViewLifecycleOwner 🌱 ViewBindingPropertyDelegate

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