使用 Kotlin,kapt 会生成:
e: [kapt] An exception occurred: android.databinding.tool.util.LoggedErrorException: Found data binding errors.
****/ data binding error ****msg:Listener class kotlin.jvm.functions.Function1 with method invoke did not match signature of any method viewModel::signIn
由于 viewModel::signIn
是类型为KFunction1
,所以我们无法使用方法引用。但是,如果我们在viewModel
中创建一个明确类型的变量,那么我们就可以将该变量作为绑定参数传递。(或者只需使用类)
Bindings.kt:
@BindingAdapter("onEditorEnterAction")
fun EditText.onEditorEnterAction(f: Function1<String, Unit>?) {
if (f == null) setOnEditorActionListener(null)
else setOnEditorActionListener { v, actionId, event ->
val imeAction = when (actionId) {
EditorInfo.IME_ACTION_DONE,
EditorInfo.IME_ACTION_SEND,
EditorInfo.IME_ACTION_GO -> true
else -> false
}
val keydownEvent = event?.keyCode == KeyEvent.KEYCODE_ENTER
&& event.action == KeyEvent.ACTION_DOWN
if (imeAction or keydownEvent)
true.also { f(v.editableText.toString()) }
else false
}
}
MyViewModel.kt:
fun signIn(password: String) {
Toast.makeText(context, password, Toast.LENGTH_SHORT).show()
}
val signIn: Function1<String, Unit> = this::signIn
布局文件 layout.xml:
<EditText
android:id="@+id/password"
app:onEditorEnterAction="@{viewModel.signIn}"
android:imeOptions="actionDone|actionSend|actionGo"
android:singleLine="true"/>