一个EventHandler类

public class EventHandler {

    public void methodReferences(View v) {
        Toast.makeText(v.getContext(), "方法绑定:", Toast.LENGTH_LONG).show();
    }
    // 其他方法...
}

一个布局文件

<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable
            name="user"
            type="net.dou7.learndatabinding.models.User" />

        <variable
            name="handler"
            type="net.dou7.learndatabinding.EventHandler" />
    </data>
    <Button
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:onClick="@{handler::methodReferences}"
      android:text="方法绑定" />
</layout>

一个Activity类

public class EventHandingDemo extends AppCompatActivity {

    private EventHandingDemoBinding mBinding;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 设置布局
        mBinding = DataBindingUtil.setContentView(this, R.layout.event_handing_demo);
        // 设置User类
        mBinding.setUser(new User("女神", 22, false));
        // 设置EventHandler
        mBinding.setHandler(new EventHandler());
    }
}

完成简单的事件绑定
官方详细说明