android-binding: onclick depend on variable - android-databinding

Question

I need when isFavorite is true then when click then call onClickSubscribe() else call onClickUnsubscribe().
In my fragment:
#Override
public void onClickSubscribe() {
}
In my xml:
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<data>
<import type="android.view.View" />
<variable
name="handler"
type="SubscribeBrandDialogFragment" />
</data>
<TextView
android:id="#+id/subscribeTextView"
android:layout_width="185dp"
android:layout_height="40dp"
android:onClick="#{handler.isFavorite ? handler.onClickSubscribe() : handler.onClickUnsubscribe()}"
android:text="#{handler.isFavorite ? #string/unsubscribe : #string/subscribe}"/>
</layout>
But I get error:
e: [kapt] An exception occurred: android.databinding.tool.util.LoggedErrorException: Found data binding errors.
****/ data binding error ****msg:Cannot find the setter for attribute 'android:onClick' with parameter type void on android.widget.TextView.
file:res\layout\subscribe_brand_dialog.xml
loc:100:31 - 100:108
****\ data binding error ****
at android.databinding.tool.processing.Scope.assertNoError(Scope.java:112)

Answer 1

Cannot find the setter for attribute 'android:onClick' with parameter
type void on android.widget.TextView
What does this say? Exactly this is problem!
If you don't write ()-> in your onClick then you have to give your View type as first parameter in method.
Solution
Change onClick line to below.
android:onClick="#{handler.isFavorite ? handler::onClickSubscribe : handler::onClickUnsubscribe}"
And set TextView as first parameter of onClickSubscribe & onClickUnsubscribe like.
void onClickSubscribe (TextView tv) {
...
}
& same for onClickUnsubscribe
All done!
I like shortcuts, so here is Tip
Make a common method with Boolean.
void onSubscribe(boolean isSubscribe){
if(isSubscribe){}
else {}
}
and call it like
android:onClick="#{() -> handler.onSubscribe(handler.isFavorite)}"
So your two methods are reduced to 1.
If you need to pass any other value just change parameter of onSubscribe. and pass from xml.

Answer 2

you can use this :
android:onClick="#{()->handler.isFavorite ? handler.onClickSubscribe() : handler.onClickUnsubscribe()}"
do no forget ()-> at first