Use Done button on Keyboard in Databinding
Using Kotlin, kapt produces:
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
(because viewModel::signIn
is of type KFunction1
) so we can't use a method reference. However, if we create a variable within the viewModel
that is explicit about the type, then we can pass that variable as the binding's param. (or just use a class)
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
layout.xml:
<EditText
android:id="@+id/password"
app:onEditorEnterAction="@{viewModel.signIn}"
android:imeOptions="actionDone|actionSend|actionGo"
android:singleLine="true"/>
I won't claim to be an expert in onEditorAction()
or soft keyboard. That said, assuming you use the solution to the stack overflow question Firoz Memon suggested, you can make it happen. Even if there is another solution that works better, this can give you an idea on how to add your own event handlers.
You'd need a binding adapter that takes some kind of handler. Let's assume you have an empty listener like this:
public class OnOkInSoftKeyboardListener {
void onOkInSoftKeyboard();
}
Then you need a BindingAdapter:
@BindingAdapter("onOkInSoftKeyboard") // I like it to match the listener method name
public static void setOnOkInSoftKeyboardListener(TextView view,
final OnOkInSoftKeyboardListener listener) {
if (listener == null) {
view.setOnEditorActionListener(null);
} else {
view.setOnEditorActionListener(new OnEditorActionListener() {
@Override
public void onEditorAction(TextView v, int actionId, KeyEvent event) {
// ... solution to receiving event
if (somethingOrOther) {
listener.onOkInSoftKeyboard();
}
}
});
}
}