Android, Checkbox listener in XML?

Official documentation: https://developer.android.com/guide/topics/ui/controls/checkbox.html

<CheckBox android:id="@+id/checkbox_meat"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="@string/meat"    android:onClick="onCheckboxClicked"/><CheckBox android:id="@+id/checkbox_cheese"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="@string/cheese"    android:onClick="onCheckboxClicked"/>

It is now possible to do this with the use of data binding library.First you need to create a handler class (in this example, I call it MainActivityHandlers). Inside this handler class, define a method (for example the name is method1) with the corresponding implementation Then in your layout file, you just need to implement :

  ... <data>    <variable        name="handler"        type="com.test.android.testapp.MainActivityHandlers" /></data>...         <RadioGroup        ...        android:onCheckedChanged="@{handler.method1}"        ...        >

and you're good to go.More info : https://developer.android.com/topic/libraries/data-binding/index.html

I believe using a lambda is more convenient:

<EditText    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:id="@+id/firstName"    android:text="@={user.firstName}" /><CheckBox    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:onCheckedChanged="@{()->handler.checked(firstName)}" />

For more details see this.

Also, I find the use of two way binding very useful for checkboxes:

<CheckBox    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:checked='@={user.isChecked}'/>

Note that onCheckedChanged is called before the two way binding sets the value.