Android Studio - How can I open url in User.java? - android-studio

Question

I'm new in android studio.
I'm hope to open url with User.java(has been data-binding), but the code is not working.
Could someone give some advice?
Thanks
Edit: OpenURL method is called in activity_main.xml
Edit: I have found problems.
User.java
public class User {
Context context;
String url;
public User(Context context, String url) {
this.context = context;
this.url = url;
}
public void OpenURL() {
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
context.startActivity(intent);
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActivityMainBinding activityMainBinding = DataBindingUtil.setContentView(this, R.layout.activity_main);
User user = new User(getApplicationContext(),"https://www.google.com.tw/?hl=zh_TW");
activityMainBinding.setUser(user);
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<variable
name="user"
type="com.rl.mp_a.User" />
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button"
android:onClick="#{() -> user.OpenURL()}"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>