Google Android - это несложно

Код: Выделить всё

public class plan extends Activity {
    Button bt1, bt2, bt3, bt4, bt5, bt6, bt7, bt8;
    Calendar calendar;
    SimpleDateFormat format1;

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

        format1 = new SimpleDateFormat("E dd.MM");
        calendar = Calendar.getInstance();

        bt1 = (Button) findViewById(R.id.button1);
        bt1.setText ("    " + format1.format(calendar.getTime()) + "   " + (getText(R.string.button1))
        );
        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                bt1.setTextColor(Color.GREEN);
                bt1.setBackgroundColor(Color.RED);
                Intent intent = new Intent(view.getContext(), citania.class);
                intent.setData(Uri.parse("file:///android_asset/1.htm"));
                startActivity(intent);
            }
        });

        calendar.add(Calendar.DAY_OF_YEAR, 1);

        bt2 = (Button) findViewById(R.id.button2);
        bt2.setText ("    " + format1.format(calendar.getTime())  + "   " + (getText(R.string.button2))
        );