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Android 提供了time picker 和 data picker可以让用户选择有效的时间和日期. 可以使用DialogFragment 来显示一个TimePickerDialog。这样的话，必须实现DialogFragment 的子类，然后在fragment的onCreateDialog()中返回TimePickerDialog。其次必须要实现TimePickerDialog.OntimeSetListner 来得到用户设定的当前时间. 下面是一个例子： public static 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) {         // Do something with the time chosen by the user     } } 实现DialogFragment的子类后。就可以直接调用DialogFragment的show()方法来显示。 下面这个例子，我们定义一个button 按键，当用户点击这个按键是，我们就显示TimePicker。 <Button     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="@string/pick_time"     android:onClick="showTimePickerDialog" /> button的回调函数是showTimePickerDialog public void showTimePickerDialog(View v) {     DialogFragment newFragment = new TimePickerFragment();     newFragment.show(getSupportFragmentManager(), "timePicker"); } 日期picker完全类似timer picker。也是要实现DialogFragment，但是在onCreateDialog中new一个DatePickerDialog。 public static 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) {         // Do something with the date chosen by the user     } } 也是定义一个button来显示datepicker <Button     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="@string/pick_date"     android:onClick="showDatePickerDialog" /> button的回调函数是showDatePickerDialog public void showDatePickerDialog(View v) {     DialogFragment newFragment = new DatePickerFragment();     newFragment.show(getSupportFragmentManager(), "datePicker"); }

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