android databinding: how to avoid onCheckedChanged triggered by programmatically

Question

I am now trying to use android data-binding in my project, and encounter this kind of issue, for example: I have 3 checkbox as a checkbox group, if first checkbox is checked, then a variable type is 1. the second makes type to 2, the 3rd makes type to 3. so I implement the code in this way.

   // layout.xml


   <android.support.v7.widget.AppCompatCheckBox
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:checked="@{userInfoViewModel.type == 1}"
        android:onCheckedChanged="@{(compoundButton, checked) -> userInfoViewModel.onTypeChecked(checked, 1)}"
        />

   <android.support.v7.widget.AppCompatCheckBox
        android:layout_width="50dp"
        android:layout_height="55dp"
        android:checked="@{userInfoViewModel.type == 2}"
        android:onCheckedChanged="@{(compoundButton, checked) -> userInfoViewModel.onTypeChecked(checked, 2)}"
        />

    <android.support.v7.widget.AppCompatCheckBox
        android:layout_width="50dp"
        android:layout_height="55dp"
        android:checked="@{userInfoViewModel.type == 3}"
        android:onCheckedChanged="@{(compoundButton, checked) -> userInfoViewModel.onTypeChecked(checked, 3)}"
        />

---

// viewModel

public void onTypeChecked(boolean checked, int i) {
    if (checked) {
        // if it is a check. set the type
        type.set(i);
    } else {
        // if it is a uncheck. set type to unknown
        type.set(0);
    }
}

Now the problem is that, if I have checked 1st checkbox, then I check the 2nd. type should be set to 2, and the UI should update correctly. But the reality is that uncheck event also occur on the 1st checkbox, after type is set to 2, then type.set(0) is triggered, so no checkbox is checked.

In fact, this issue is same to onCheckedChanged called automatically. What I need is a solution for data-binding.

In non-data-binding project, I think the best solution is using setCheckedSilent(answer by @Emanuel Andrada).

  public void setCheckedSilent(boolean checked) {
    super.setOnCheckedChangeListener(null);
    super.setChecked(checked);
    super.setOnCheckedChangeListener(listener);
}

But in data-binding, I can not do this. So is there any expert can help me out?

According to @Arpan Sharma's answer, listen to onClick instead of onCheckedChanged. This solution works currently, But I am worried about the value of checked, is it always right?

public void onTypeChecked(View view, int i) {
    Boolean checked = ((CheckBox) view).isChecked();

    if (checked) {
        type.set(i);
    } else {
        type.set(0);
    }
}

Answer 1

Expose an ObservableBoolean from the ViewModel, then use two-way databinding over that boolean.

Then you can use the ObservableBoolean's values to decide what you want to do, rather than encode it in the XML.

android:checked="@={vm.checkedValue}"