Kotlin Synthetic：在具有动态膨胀的多个布局中引用具有相同 ID 的视图

Question

我有两个布局：data_a.xml 和 data_b.xml。它们都用于显示相同的数据，但布局不同。两种布局都有一个TextViewid data_label。

我的自定义视图DataView允许膨胀 data_a.xml 或 data_b.xml 以呈现我的数据，具体取决于是否Styleable具有layout属性。

数据视图.kt：

class DataView(context: Context?, attrs: AttributeSet?) : ConstraintLayout(context, attrs) {

    init {
        var layoutResId = R.layout.data_a
        if (attrs != null) {
            val a = context?.theme?.obtainStyledAttributes(attrs, R.styleable.DataView, 0, 0)
            try {
                layoutResId = a!!.getResourceId(R.styleable.DataView_layout, layoutResId)
            } finally {
                a?.recycle()
            }
        }
        View.inflate(context, layoutResId, this)
        data_label.text = "Foobar" // this won't work if I choose data_b.xml as layout
    }
}

attrs.xml：

<declare-styleable name="DataView">
    <attr name="layout" format="reference"/>
</declare-styleable>

这就是我选择要使用的布局的方式：

<?xml version="1.0" encoding="utf-8"?>
    ...
    <com.duh.DataView
        android:id="@+id/data_view"
        app:layout="@layout/data_a"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"/>

有没有办法使用 Kotlin Synthetic 来做到这一点？

Answer 1

If you want to import different widgets with the same ID with Kotlin Synthetic, you can alias them in your imports:

import kotlinx.android.synthetic.main.data_a.view.data_label as labelA
import kotlinx.android.synthetic.main.data_b.view.data_label as labelB

Then in your DataView you can assign your text to the TextView which is not null, depending on the layout you inflated:

(labelA ?: labelB)?.text = "Foobar"