seupedro

public class DrawerActivity extends ActionBarActivity {
    private DrawerLayout mDrawerLayout = null;
    private ListView mDrawerList = null;
    private String[] mDrawerItems;
    private ActionBarDrawerToggle mDrawerToggle = null;

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

seupedro

/*
* This is a simple and easy approach to reuse the same 
* navigation drawer on your other activities. Just create
* a base layout that conains a DrawerLayout, the 
* navigation drawer and a FrameLayout to hold your
* content view. All you have to do is to extend your 
* activities from this class to set that navigation 
* drawer. Happy hacking :)
* P.S: You don't need to declare this Activity in the 
* AndroidManifest.xml. This is just a base class.

seupedro

public class ReportCard {
    //Defining variables
    private String mMateria;
    private double mNota;
    //Constructor
    public ReportCard( String materia, double nota){
        mMateria = materia;
        mNota = nota;
    }
    //Getter Methods

seupedro

public class Carro {

    private int mModelo;
 
    public Carro() {
        mModelo = 0;
        setup();
    }

    public Carro(int modelo) {