MainActivity.java

package com.dam.profesor.fragmentdinamico;

import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity implements View.OnClickListener, BlankFragment.OnFragmentInteractionListener {

    Button boton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        boton = (Button)findViewById(R.id.button);
        boton.setOnClickListener(this);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onClick(View v) {

        //Paso 1: Obtener la instancia del administrador de fragmentos
        FragmentManager fragmentManager = getFragmentManager();

        //Paso 2: Crear una nueva transacción
        FragmentTransaction transaction = fragmentManager.beginTransaction();

        //Paso 3: Crear un nuevo fragmento y añadirlo
        BlankFragment fragment = new BlankFragment();
        transaction.add(R.id.layoutprincipal, fragment);

        //Paso 4: Confirmar el cambio
        transaction.commit();


    }

    public void onFragmentInteraction(Uri uri){
        //you can leave it empty
    }
}