查看菜单文件的绑定？

Question

是否可以在菜单资源中使用View Binding（或Data Binding）？

override fun onCreateOptionsMenu(menu: Menu): Boolean {
    menuInflater.inflate(R.menu.menu_main, menu)
    
    // search using ID - can this be replaced by view binding?
    val searchView = menu.findItem(R.id.menu_search).actionView as SearchView
}

Answer 1

In most cases, view binding replaces findViewById.

根据 documentations:

View binding is a feature that allows you to more easily write code that interacts with views. Once view binding is enabled in a module, it generates a binding class for each XML layout file present in that module.

在菜单中使用 findItem() 而不是 findViewById() 方法的地方。

Answer 2

目前，dataBinding仅适用于布局资源，不适用于菜单资源。

Answer 3

特定于View Binding with menu items with custom xml views, not Data Binding：

partial_menu_sample_view.xml

<?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"
    android:layout_width="?actionBarSize"
    android:layout_height="?actionBarSize"
    android:clipToPadding="false"
    android:focusable="true">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:contentDescription="@null"
        android:src="@drawable/ic_sample"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />


    <TextView
        android:id="@+id/textview_sample"
        android:visibility="gone"
        app:layout_constraintBottom_toTopOf="@id/guideline_horizontal_center"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="@id/guideline_vertical_center"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

activity_sample.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

  <androidx.appcompat.widget.Toolbar 
    android:id="@+id/toolbar_sample"/>

</LinearLayout>

SampleActivity.kt

class SampleActivity() {

  lateinit var binding: ActivitySampleBinding
  var menuSampleViewBinding: PartialMenuSampleViewBinding? = null

  ...

  override fun onCreate() {
    super.onCreate()
    binding = ActivitySampleBinding.inflate(layoutInflater)
    setContentView(binding.root)
    // make sure to set the toolbar
    setSupportActionBar(binding.toolbarSample)
  }

  ...

  override fun onCreateOptionsMenu() {
      // inflate the menu to show on your toolbar
      // replace with your own menu xml
      binding.toolbarProduct.inflateMenu(R.menu.activity_sample)
      
      with(binding.toolbarProduct.menu) {
            findItem(R.id.menu_item_cart)?.actionView?.let {
                menuSampleViewBinding = PartialMenuSampleViewBinding.bind(it)
            }
            // handle other menu items here
      }
  }

  ...

  fun customFunction() {
      // use as needed
      menuSampleViewBinding?.textviewSample?.text = "1"
      menuSampleViewBinding?.root?.setOnClickListeners { /* add what you need */ } 
  }

}

在菜单项上有徽章计数的用例中使用了它。工作正常。

查看菜单文件的绑定？

View binding for menu files?

android

android-databinding

android-menu

android-viewbinding