Android bidirectional data-binding

activitiy_main.xml

<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    >
  <data>
    <import type="your.package.name.Variables"/>
    <variable
        name="name"
        type="String"
        />
  </data>
  <LinearLayout
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical"
      >

    <TextView
        android:text="@{@string/hello_world(name)}"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:bind="@{Variables.name}"
        />

  </LinearLayout>
</layout>

DataBinding.java

public class DataBinding {
  @android.databinding.BindingAdapter("bind")
  public static void addTextChangedListener(EditText view, final int variable) {
    final ViewDataBinding binding = DataBindingUtil.findBinding(view);

    view.addTextChangedListener(new TextWatcher() {
      @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {

      }

      @Override public void onTextChanged(CharSequence s, int start, int before, int count) {
        binding.setVariable(variable, s.toString());
        binding.executePendingBindings();
      }

      @Override public void afterTextChanged(Editable s) {

      }
    });
  }
}

strings.xml

<resources>
  <string name="hello_world">Hello %s!</string>
</resources>

Variables.java

/**
 * This class is used for dynamic binding.
 *
 * The generated BR class could not be used in layouts directly.
 * This class acts as wrapper in order to used binding ids in layouts.
 */
public class Variables {
  public final static int name = BR.name;
}

Can you please post the your mainactivity class of this project...