How to databind to onTextChanged for an EditText on Android?

Question

In Yigit Boyar and George Mount\'s talk on Android Databinding they illustrate how easy it is to bind to TextWatcher\'s onTextChanged (at 13:41). O

Answer 1

The Easy Way

If you are using onTextChange() to have updated text in model then you can directly use Two-way Binding.

And you model class will have getter & setter.

public class User {
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

Now the Name in Model will be changed realtime with user interaction. So whenever use binding.getUser().getName(), you will get latest text.

One-Way Binding will only gets updated when model value is changed. It does not update model back real time.

android:text="@{user.name}"

Two-Way Binding update model variable in real time with user input.

android:text="@={user.name}"

The ONLY difference is of = (equal sign) receives data changes to the property and listen to user updates at the same time.