本文介绍Pickers控件。下面的内容都是参考"Pickers测试代码"进行的讲解，感兴趣的可以进行测试验证。

1. TimePicker的使用

第一步: 定义一个TimePicker的Fragment。

public class TimePickerFragment extends DialogFragment
    implements TimePickerDialog.OnTimeSetListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current time as the default values for the picker
        final Calendar c = Calendar.getInstance();
        int hour = c.get(Calendar.HOUR_OF_DAY);
        int minute = c.get(Calendar.MINUTE);

        // Create a new instance of TimePickerDialog and return it
        return new TimePickerDialog(getActivity(), this, hour, minute,
                DateFormat.is24HourFormat(getActivity()));
    }   

    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        Toast.makeText(getApplicationContext(), "hour="+hourOfDay+", min="+minute, Toast.LENGTH_SHORT).show();
    }   
}   

第二步: 显示该Fragment

public void showTimePickerDialog(View v) {
    DialogFragment newFragment = new TimePickerFragment();
    newFragment.show(getSupportFragmentManager(), "timePicker");
}   

showTimePickerDialog()是一个Button对应的监听函数。

2. DatePicker的使用

步骤和TimePicker一样。

public void showDatePickerDialog(View v) {
    DialogFragment newFragment = new DatePickerFragment();
    newFragment.show(getSupportFragmentManager(), "datePicker");
}   

public class DatePickerFragment extends DialogFragment
    implements DatePickerDialog.OnDateSetListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current date as the default date in the picker
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        // Create a new instance of DatePickerDialog and return it
        return new DatePickerDialog(getActivity(), this, year, month, day);
    }

    public void onDateSet(DatePicker view, int year, int month, int day) {
        Toast.makeText(getApplicationContext(),
                "year="+year+", month="+month+", day="+day, Toast.LENGTH_SHORT).show();
    }
}