Android Two Way DataBinding Problem of Ternary Operator Must be Constant

Question

My EditText is like this:

Answer 1

Ok, I've figured out the perfect solution after these days:

1. Create BindingAdapter Function:

object DataBindingUtil {                                    //place in an util (singleton) class
    @BindingAdapter("android:text", "isAddCase")            //custom layout attribute, see below
    @JvmStatic                                              //required
    fun setText(editText: EditText, text: String, isAddCase: Boolean) {     //pass in argument
        if (isAddCase) editText.setText("") else editText.setText(text)
    }
}

• Passing multiple arguments from layout to BindingAdapter function: How can I pass multiple arguments via xml for a custom setter when using Android data binding

2. Apply Custom Attribute in View:

                   //here

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• The BindingAdapter function is triggered only when using EditText and custom attribute At The Same Time.