Android ViewBinding <merge> 布局问题[重复]

Question

我是这样定义布局的：

<?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="match_parent"
    android:layout_height="match_parent">

    <eo.view.batterymeter.BatteryMeterView
        android:id="@+id/batteryMeter"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_margin="16dp"
        app:layout_constraintBottom_toTopOf="@id/colorInputView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <include layout="@layout/include_battery_meters_with_indicator" />

    <eo.view.colorinput.ColorInputView
        android:id="@+id/colorInputView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/batteryMeter" />

</androidx.constraintlayout.widget.ConstraintLayout>

这是包含的布局文件：

<?xml version="1.0" encoding="utf-8"?>
<merge 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"
    tools:showIn="@layout/activity_color_edit">

    <eo.view.batterymeter.BatteryMeterView
        android:id="@+id/chargingBatteryMeter"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="24dp"
        android:layout_marginEnd="24dp"
        app:layout_constraintBottom_toBottomOf="@id/batteryMeter"
        app:layout_constraintEnd_toStartOf="@id/criticalBatteryMeter"
        app:layout_constraintStart_toStartOf="@id/batteryMeter"
        app:layout_constraintTop_toTopOf="@id/batteryMeter" />

    <eo.view.batterymeter.BatteryMeterView
        android:id="@+id/criticalBatteryMeter"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginEnd="24dp"
        app:layout_constraintBottom_toBottomOf="@id/chargingBatteryMeter"
        app:layout_constraintEnd_toStartOf="@id/unknownBatteryMeter"
        app:layout_constraintStart_toEndOf="@id/chargingBatteryMeter"
        app:layout_constraintTop_toTopOf="@id/chargingBatteryMeter" />

    <eo.view.batterymeter.BatteryMeterView
        android:id="@+id/unknownBatteryMeter"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginEnd="24dp"
        app:layout_constraintBottom_toBottomOf="@id/chargingBatteryMeter"
        app:layout_constraintEnd_toEndOf="@id/batteryMeter"
        app:layout_constraintStart_toEndOf="@id/criticalBatteryMeter"
        app:layout_constraintTop_toTopOf="@id/chargingBatteryMeter" />

    <androidx.constraintlayout.widget.Group
        android:id="@+id/indicatorBatteryMeterGroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone"
        app:constraint_referenced_ids="chargingBatteryMeter,criticalBatteryMeter,unknownBatteryMeter" />

</merge>

在源代码中我缩小了布局：

private lateinit var binding: ActivityColorEditBinding

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    binding = ActivityColorEditBinding.inflate(layoutInflater)
    val view = binding.root

    setContentView(view)

    setupActionBar()
    setupBatteryMeters()
    setupColorInput()
}

由于某些原因，包含文件中的项目未绑定，因此对此类项目的引用不起作用，例如在此方法中 binding.indicatorBatteryMeterGroup 无法识别：

private fun setupBatteryMeters() {
    when (colorType) {
        ColorType.INDICATOR -> {
            setupIndicatorBatteryMeters()
            binding.batteryMeter.isInvisible = true
            binding.indicatorBatteryMeterGroup.isVisible = true
        }
        else -> {
            setupBattery(binding.batteryMeter)
            binding.indicatorBatteryMeterGroup.isVisible = false
            binding.batteryMeter.isVisible = true
        }
    }
} 

Answer 1

给你的include元素一个ID：

<include layout="@layout/include_battery_meters_with_indicator"
    android:id="@+id/battery_meters" />

然后您可以将它们作为绑定属性的属性访问，例如binding.batteryMeters.criticalBatteryMeter。

不要在 merge 元素上添加 ID。 IIRC，这导致它无法正常工作。 ID 必须在include 上。