@SuppressLint("SimpleDateFormat")
public class CaldroidSampleActivity extends AppCompatActivity {
    private boolean undo = false;
    private CaldroidFragment caldroidFragment;
    private CaldroidFragment dialogCaldroidFragment;

    private void setCustomResourceForDates() {
        Calendar cal = Calendar.getInstance();

        // Min date is last 7 days
        cal.add(Calendar.DATE, -7);
        Date blueDate = cal.getTime();

        // Max date is next 7 days
        cal = Calendar.getInstance();
        cal.add(Calendar.DATE, 7);
        Date greenDate = cal.getTime();

        if (caldroidFragment != null) {
            ColorDrawable blue = new ColorDrawable(getResources().getColor(R.color.blue));
            ColorDrawable green = new ColorDrawable(Color.GREEN);
            caldroidFragment.setBackgroundDrawableForDate(blue, blueDate);
            caldroidFragment.setBackgroundDrawableForDate(green, greenDate);
            caldroidFragment.setTextColorForDate(R.color.white, blueDate);
            caldroidFragment.setTextColorForDate(R.color.white, greenDate);
        }
    }

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

        final SimpleDateFormat formatter = new SimpleDateFormat("dd MMM yyyy");

        caldroidFragment = new CaldroidFragment();

        if (savedInstanceState != null) {
            caldroidFragment.restoreStatesFromKey(savedInstanceState,
                    "CALDROID_SAVED_STATE");
        }

        else {
            Bundle args = new Bundle();
            Calendar cal = Calendar.getInstance();
            args.putInt(CaldroidFragment.MONTH, cal.get(Calendar.MONTH) + 1);
            args.putInt(CaldroidFragment.YEAR, cal.get(Calendar.YEAR));
            args.putBoolean(CaldroidFragment.ENABLE_SWIPE, true);
            args.putBoolean(CaldroidFragment.SIX_WEEKS_IN_CALENDAR, true);

            caldroidFragment.setArguments(args);
        }

        setCustomResourceForDates();

        // Attach to the activity
        FragmentTransaction t = getSupportFragmentManager().beginTransaction();
        t.replace(R.id.calendar1, caldroidFragment);
        t.commit();

        // Setup listener
        final CaldroidListener listener = new CaldroidListener() {

            @Override
            public void onSelectDate(Date date, View view) {
                Toast.makeText(getApplicationContext(), formatter.format(date),
                        Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onChangeMonth(int month, int year) {
                String text = "month: " + month + " year: " + year;
                Toast.makeText(getApplicationContext(), text,
                        Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onLongClickDate(Date date, View view) {
                Toast.makeText(getApplicationContext(),
                        "Long click " + formatter.format(date),
                        Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onCaldroidViewCreated() {
                if (caldroidFragment.getLeftArrowButton() != null) {
                    Toast.makeText(getApplicationContext(),
                            "Caldroid view is created", Toast.LENGTH_SHORT)
                            .show();
                }
            }

        };

        // Setup Caldroid
        caldroidFragment.setCaldroidListener(listener);

        final TextView textView = (TextView) findViewById(R.id.textview);

    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        // TODO Auto-generated method stub
        super.onSaveInstanceState(outState);

        if (caldroidFragment != null) {
            caldroidFragment.saveStatesToKey(outState, "CALDROID_SAVED_STATE");
        }

        if (dialogCaldroidFragment != null) {
            dialogCaldroidFragment.saveStatesToKey(outState,
                    "DIALOG_CALDROID_SAVED_STATE");
        }
    }

}