1. The background

In most cases, replace findViewById with ViewBinding. In the past, if you didn’t use a third-party framework, no matter how encapsulated, it was still very inconvenient to use (such as unable to find controls, control ID conflicts, etc.)

2. Start the ViewBinding process

• Update AS to version 3.6 first
• Open the Gradle file for Module
• Add the following code to the Android function and you’re done

android {
    ...
    viewBinding {
        enabled = true
    }
}
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3. Use of ViewBinding

• By default, the layout XML file generates an XXXBinding class
• Tools :viewBindingIgnore=”true”**

<LinearLayout
        ...
        tools:viewBindingIgnore="true" >
    ...
</LinearLayout>
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• Add a layout file activity_main.xml as follows:

<? The XML version = "1.0" encoding = "utf-8"? > <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <TextView android:id="@+id/tv_content" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!" android:textSize="24sp" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" /> </androidx.constraintlayout.widget.ConstraintLayout>Copy the code

• You can then use the XXXBinding class within the Activity, which provides three initialization functions

  fun inflate(inflater: LayoutInflater): XXXBinding
  fun inflate(inflater: LayoutInflater, parent: ViewGroup, attachToParent: boolean): XXXBinding
  fun bind(view: View): XXXBinding
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• Add an activityMainActivity.kt with the following code

  class MainActivity:BaseActivity() {
  
  private val tag:String ="MainActivity"
  
  private lateinit var viewbinding:ActivityMainBinding
  private lateinit var button:Button
  
  override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
  
      Log.d(tag, "onCreate:$SPLASH_TIME")
  }
  
  override fun observerViewModel() {
  }
  
  override fun initViewBinding() {
      viewbinding = ActivityMainBinding.inflate(layoutInflater)
      setContentView(viewbinding.root)
  }
  
  override fun initViews() {
      button = viewbinding.buttonMain
      button.setOnClickListener {
          navigationLoginActivity()
      }
  }
  
  private fun navigationLoginActivity(){
      startActivity(Intent(this,LoginActivity::class.java))
  }
  }
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• 4. Use the ViewBinding on the Fragment

• Add a layout file called fragment_view_binding.xml. The code is not listed:

• Add a Fragment, ViewBindingFragment, the code is as follows:

public class ViewBindingFragment extends Fragment { private FragmentViewBindingBinding binding; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { binding = FragmentViewBindingBinding.inflate(inflater, container, false); View view = binding.getRoot(); Binding. TvContent. SetText (" here is set up in fragments through ViewBinding text "); return view; } public static ViewBindingFragment newInstance() { Bundle args = new Bundle(); ViewBindingFragment fragment = new ViewBindingFragment(); fragment.setArguments(args); return fragment; } @Override public void onDestroyView() { super.onDestroyView(); binding = null; }}Copy the code

Precautions for using Fragment

When using ViewBinding in your Fragment, remove the binding reference in the **onDestroyView()** method. Otherwise, you will leak memory.

Reference: www.jianshu.com/p/e2c565d4d…