时间日期选择器、对话框

public class MainActivity extends ActionBarActivity {
private Context mContext;

private TimePicker timePicker;
private DatePicker datePicker;

private Button btn_date;
private Button btn_time;

private int year;
private int month;
private int day;
private int hour;
private int minute;
private int second;

private String date;
private String time;

private Formatter fmt;
private Calendar cal;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mContext = this;

        cal = Calendar.getInstance();
        year = cal.get(Calendar.YEAR);
        month = cal.get(Calendar.MONTH);
        day = cal.get(Calendar.DAY_OF_MONTH);
        hour = cal.get(Calendar.HOUR_OF_DAY);
        minute = cal.get(Calendar.MINUTE);
        second = cal.get(Calendar.SECOND);

        fmt = new Formatter();
        fmt.format("%d/%d/%d",year,month,day);
        date = fmt.toString();
        fmt = new Formatter();
        fmt.format("%d:%d:%d", hour, minute, second);
        time = fmt.toString();


        changeDate();

        datePicker = (DatePicker)findViewById(R.id.datePicker);
        timePicker = (TimePicker)findViewById(R.id.timePicker);

        datePicker.init(year, month, day, new DatePicker.OnDateChangedListener() {
@Override
public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                fmt = new Formatter();
                fmt.format("%d/%d/%d",year,(monthOfYear+1),dayOfMonth); //month从0开始 所以需要加1
                date = fmt.toString();
                changeDate();
            }
        });

        timePicker.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {
@Override
public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
                fmt = new Formatter();
                fmt.format("%d:%d",hourOfDay,minute);
                time = fmt.toString();
                changeDate();
            }
        });




//时间 日期 对话框

        btn_date = (Button)findViewById(R.id.btn_date);
        btn_time = (Button)findViewById(R.id.btn_time);

//日期选择器
        btn_date.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
new DatePickerDialog(mContext, new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                        fmt = new Formatter();
                        fmt.format("%d/%d/%d",year,(monthOfYear+1),dayOfMonth); //month从0开始 所以需要加1
                        date = fmt.toString();
                        changeDate();
                    }
                },cal.get(Calendar.YEAR),cal.get(Calendar.MONTH),cal.get(Calendar.DAY_OF_MONTH)).show();
            }
        });

//时间选择器
        btn_time.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
new TimePickerDialog(mContext, new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                        fmt = new Formatter();
                        fmt.format("%d:%d",hourOfDay,minute);
                        time = fmt.toString();
                        changeDate();
                    }
                },cal.get(Calendar.HOUR_OF_DAY),cal.get(Calendar.MINUTE),true).show();
            }
        });
    }

private void changeDate(){
        setTitle(date + " "  +time);
    }
}