public class RecipeActivity extends AppCompatActivity {
    private Recipe mRecipe = null;

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Supporting going back to the list of recipes.
        if (getSupportActionBar() != null) {
            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        }

        // Determine if the activity is started from another, thus try to parse the activity desired
        // extras.
        Intent intent = getIntent();
        if (intent != null && intent.hasExtra(getString(R.string.key_recipe))) {
            this.mRecipe = intent.getParcelableExtra(getString(R.string.key_recipe));
        }

        if (this.mRecipe != null) {
            setTitle(this.mRecipe.getName());
        }
    }
}