android declarative activity transition

activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
              
    xmlns:transition="https://aboumrad.info/transition"
              
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="info.aboumrad.transitiontest.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!" />

    <info.aboumrad.transitiontest.TransitionButton
        android:text="Load Foo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        transition:to="FooActivity"/>

    <info.aboumrad.transitiontest.TransitionButton
        android:text="Load Bar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        transition:to="BarActivity"/>
</LinearLayout>

TransitionButton.java

package info.aboumrad.transitiontest;

import android.content.Context;
import android.content.Intent;
import android.util.AttributeSet;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class TransitionButton extends Button {

    Context _context;

    String _target;

    public TransitionButton(Context context, AttributeSet attrs) {
        super(context, attrs);

        this._context = context;
        this._target = attrs.getAttributeValue("https://aboumrad.info/transition", "to");

        this.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                handle_click(v);
            }
        });
    }

    public void handle_click(View view){
        try {
            Class clazz = getActivityFromName(
                    _context.getApplicationContext().getPackageName() + "." + _target);

            _context.startActivity(new Intent(_context, clazz));
        }catch(ClassNotFoundException ex){
            Toast.makeText(_context, "Unable to load " + _target, Toast.LENGTH_SHORT).show();
        }
    }

    public Class getActivityFromName(String name) throws ClassNotFoundException {
        return Class.forName(name);
    }
}