How to bind to a combobox using butterknife?

Question

Using Butterknife, how can I declare a method that is called when the combobox is selected or deselected? Using @OnItemSelected gives a ClassCastException:

java.lang.ClassCastException: androidx.appcompat.widget.AppCompatCheckBox 
                              cannot be cast to android.widget.AdapterView

Answer 1

UPDATE:

It is better to use @OnCheckedChanged like this:

    @OnCheckedChanged(R.id.myCheckBox)
    void myCheckBoxSelected(boolean checked) {
        // use checked here
    }

The advantage is that you immediately get the boolean flag.

ORIGINAL ANSWER:

You need to use the @OnClick annotation:

    @OnClick(R.id.myCheckBox)
    void myCheckBoxSelected(CheckBox checkBox) {
        boolean checked = checkBox.isChecked();
        // use checked here
    }

Also make sure you use isChecked to know the checked state (Do not use isSelected() which also exists on a Combobox)