kotlin 中的数据绑定 TypeConverter 错误

Question

我在一些数据绑定中使用了 TypeConverter。问题是它需要静态函数，当我将它转换为 Kotlin 时，它会进入伴随对象，数据绑定处理器无法跟踪更改。

我收到以下错误：

java.lang.IllegalStateException: Required DataBindingComponent is null in class ListMainBinding. A BindingAdapter in com.noisyninja.androidlistpoc.model.DataConverter.Companion is not static and requires an object to use, retrieved from the DataBindingComponent. If you don't use an inflation method taking a DataBindingComponent, use DataBindingUtil.setDefaultComponent or make all BindingAdapter methods static. at android.databinding.ViewDataBinding.ensureBindingComponentIsNotNull(ViewDataBinding.java:554)

如何让它识别伴随对象中的静态 @TypeConverter 注释方法

Answer 1

你可以在Binding Adapter方法上面加上@jvmStatic注解，像这样：

@BindingAdapter(value = "visiblity")
@JvmStatic
fun showHide(view : View, show : Boolean){
    view.visibility = when {
        show -> View.VISIBLE
        else -> View.GONE
    }
}