Versão final da atividade de criação de novos vídeos.

MainActivity.java

package edu.ifmg.eati.movieme;

import android.content.Intent;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;

import edu.ifmg.eati.movieme.model.Movie;

public class MainActivity extends AppCompatActivity {

    private static final int NEW_MOVIE_CODE = 1;

    MoviesAdapter adapter;

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

        ListView moviesList = (ListView) findViewById(R.id.movies_list);
        adapter = new MoviesAdapter(this);
        moviesList.setAdapter(adapter);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.btn_new_movie);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, NewMovieActivity.class);
                startActivityForResult(intent, NEW_MOVIE_CODE);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == NEW_MOVIE_CODE && resultCode == RESULT_OK) {
            String name = data.getStringExtra("name");
            int rating = data.getIntExtra("rating", -1);
            String comment = data.getStringExtra("comment");

            Movie newMovie = new Movie(name, rating, comment);
            adapter.addNewMovie(newMovie);
        }
    }
}

MoviesAdapter.java

package edu.ifmg.eati.movieme;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.ArrayList;

import edu.ifmg.eati.movieme.model.Movie;

/**
 * Created by edumontandon on 5/17/16.
 */
public class MoviesAdapter extends BaseAdapter {

    // Lista de filmes a serem exibidos
    private ArrayList<Movie> movies;

    private Context context;

    public MoviesAdapter(Context context) {
        this.context = context;
        this.movies = new ArrayList<>();

        loadMovies();
    }

    private void loadMovies() {
        this.movies.add(new Movie("Star Wars", 7, "Filme clássico"));
        this.movies.add(new Movie("Senhor dos Anéis", 10, "ÉPICO!!"));
        this.movies.add(new Movie("A Origem", 9, "Mind Blowing"));
        this.movies.add(new Movie("Pulp Fiction", 8, "Obra prima"));
        this.movies.add(new Movie("Se eu fosse você", 3, "Se eu fosse você... não pederia seu tempo"));

    }

    @Override
    public int getCount() {
        return this.movies.size();
    }

    @Override
    public Object getItem(int position) {
        return this.movies.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        // obtem o filme desejado
        Movie movie = this.movies.get(position);

        View view = LayoutInflater.from(this.context).inflate(R.layout.adapter_movies, parent, false);

        TextView lblName = (TextView) view.findViewById(R.id.lbl_movie_name);
        TextView lblGrade = (TextView) view.findViewById(R.id.lbl_movie_grade);
        TextView lblComment = (TextView) view.findViewById(R.id.lbl_movie_comment);

        lblName.setText(movie.getName());
        lblGrade.setText(String.valueOf(movie.getRating()));
        lblComment.setText(movie.getComment());

        return view;
    }


    public void addNewMovie(Movie newMovie) {
        this.movies.add(newMovie);

        // atualiza o adapter com o novo filme
        this.notifyDataSetChanged();
    }
}

NewMovieActivity.java

package edu.ifmg.eati.movieme;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.Toast;

public class NewMovieActivity extends AppCompatActivity {

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

        final EditText txtName = (EditText) findViewById(R.id.txt_movie_name);
        final SeekBar skRating = (SeekBar) findViewById(R.id.sk_movie_rating);
        final EditText txtComment = (EditText) findViewById(R.id.txt_comment);

        Button okButton = (Button) findViewById(R.id.btn_new_movie);
        okButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent returnIntent = new Intent();
                returnIntent.putExtra("name", txtName.getText().toString());
                returnIntent.putExtra("rating", skRating.getProgress());
                returnIntent.putExtra("comment", txtComment.getText().toString());

                setResult(RESULT_OK, returnIntent);

                Toast.makeText(NewMovieActivity.this, "Filme cadastrado com sucesso", Toast.LENGTH_LONG).show();
                NewMovieActivity.this.finish();
            }
        });
    }
}