如何使用两个按钮实现多个datepickerfunction并保存选择的日期？
我想创建一个活动，其中我想要有两个按钮和多个标签。 用户可以单击按钮从中选择日期。 而这些选定日期可以在标签中显示，以便用户可以知道用户已经选择了哪些日期。
任何人都可以指导我如何做到这一点。
- 使用多个日期选择function，两个按钮上只有两个日期选择器。
- 我该如何保存这些日期。 因此，每当用户离开此活动并再次访问时，他可能会知道。
我已经创建了DatePickerFragment帮助器类，使用它可以选择任意数量的日期，只有一个DatePickerFragment类。
public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener { /** * The callback interface used to indicate the user is done filling in the date (they clicked on the 'Set' button). */ public interface OnDateSetListener { /** * @param dialog The view associated with this listener. * @param year The year that was set. * @param monthOfYear The monthOfYear that was set. * @param dayOfMonth The dayOfMonth that was set. */ void onDateSet(DatePicker dialog, int year, int monthOfYear, int dayOfMonth, int reqCode); } private OnDateSetListener mListener; private int reqCode; public void setOnDateSetListener(OnDateSetListener mListener, int reqCode){ this.mListener = mListener; this.reqCode = reqCode; } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { int year; int month; int day; final Calendar c = Calendar.getInstance(); Bundle bundle = this.getArguments(); if(bundle!=null) { // Use the given date as the default date in the picker year = bundle.getInt("YEAR"); month = bundle.getInt("MONTH"); day = bundle.getInt("DAY"); }else{ // Use the current date as the default date in the picker year = c.get(Calendar.YEAR); month = c.get(Calendar.MONTH); day = c.get(Calendar.DAY_OF_MONTH); } // Create a new instance of DatePickerDialog and return it return new DatePickerDialog(getActivity(), this, year, month, day); } @Override public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) { if(mListener!=null) mListener.onDateSet(view, year, monthOfYear, dayOfMonth, reqCode); this.dismiss(); } }
在Activity或Fragment中使用它
public class MainActivity extends FragmentActivity implements DatePickerFragment.OnDateSetListener { private static final int FROM_DATE_TAG = 2404; private static final int TO_DATE_TAG = 2405; @Override public void onClick(View view) { FragmentManager fragmentManager = getSupportFragmentManager(); DatePickerFragment fragment; switch(view.getId()){ case R.id.fromDate: fragment = new DatePickerFragment(); fragment.setOnDateSetListener(this, FROM_DATE_TAG); fragment.show(fragmentManager, "Date Picker"); break; case R.id.toDate: fragment = new DatePickerFragment(); fragment.setOnDateSetListener(this, TO_DATE_TAG); fragment.show(fragmentManager, "Date Picker"); break; } } //If you want to update the alredy selected date, Specify it in budle. DatePickerFragment will take specified bundle date as default date. private void updateDate() { //get to date stored in SharedPrefrence String toDate = SharedPrefrenceUtils.getString(mContext, "FROM_DATE"); SimpleDateFormat sdf = new SimpleDateFormat("MMM dd, yyyy", Locale.getDefault()); Date parse = sdf.parse(toDate); Calendar c = Calendar.getInstance(); c.setTime(parse); FragmentManager fragmentManager = this.getActivity().getSupportFragmentManager(); DatePickerFragment fragment = new DatePickerFragment(); Bundle bundle = new Bundle(); bundle.putInt("YEAR", c.get(Calendar.YEAR)); bundle.putInt("MONTH", c.get(Calendar.MONTH)); bundle.putInt("DAY", c.get(Calendar.DATE)); fragment.setArguments(bundle); fragment.setOnDateSetListener(this, FROM_DATE_TAG); fragment.show(fragmentManager, "Date Picker"); } @Override public void onDateSet(DatePicker dialog, int year, int monthOfYear, int dayOfMonth, int reqCode) { if(reqCode == FROM_DATE_TAG){ Calendar myCalendar = Calendar.getInstance(); myCalendar.set(year, monthOfYear, dayOfMonth); SimpleDateFormat formatter = new SimpleDateFormat("MMM dd, yyyy", Locale.getDefault()); String dateString = formatter.format(myCalendar.getTime()); Log.i("From Date","DATE:"+dateString);//"Result = DATE:May 24, 2015" //Store FROM_DATE in SharedPrefrence SharedPrefrenceUtils.putString(mContext,"FROM_DATE", dateString); } else if(reqCode == TO_DATE_TAG){ Calendar myCalendar = Calendar.getInstance(); myCalendar.set(year, monthOfYear, dayOfMonth); SimpleDateFormat formatter = new SimpleDateFormat("MMM dd, yyyy", Locale.getDefault()); String dateString = formatter.format(myCalendar.getTime()); Log.i("To Date","DATE:"+dateString);//"Result = DATE:May 25, 2015" //Store TO_DATE in SharedPrefrence SharedPrefrenceUtils.putString(mContext,"TO_DATE", dateString); } } }
请参阅如何在Fragment中显示SharedPreference存储的数据？ 对于SharedPrefrenceUtils类。
您可以使用Shared pref存储上次日期选择器值。