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我正在使用google示例使用对话片段在我的应用程序中插入一个datepicker
http://developer.android.com/guide/topics/ui/controls/pickers.html
但是我不确定在设置之后如何获取日期(不是java专家)。对话框和日期选择器运行正常，我可以记录日期已正确设置，但是，我如何才能在父活动上执行回调？
这是我的对话框片段
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) {
**Log.w("DatePicker","Date = " + year);**
}...and我从我的活动中调用对话框...
public void showDatePickerDialog(View v) {
DialogFragment newFragment = new DatePickerFragment();
newFragment.show(getSupportFragmentManager(), "datePicker");
}在父activity中调用方法而不是Log.w的正确方式是什么？我认为这与将回调作为参数传递有关，但我在互联网上找到的大多数参考资料都是关于没有对话片段的早期版本的。
编辑:不确定它是否重要，但父活动声明为：
public class EditSessionActivity extends FragmentActivity {解决方案:感谢Lecho user，这就是实现它的方法
DatePickerFragmennt.class
public class DatePickerFragment extends DialogFragment{
@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(), (EditSessionActivity)getActivity(), year, month, day);
}...and父活动EditSessionActivity.class...
public class EditSessionActivity extends FragmentActivity implements OnDateSetListener {
@Override
public void onDateSet(DatePicker view, int year, int month, int day) {
//do some stuff for example write on log and update TextField on activity
Log.w("DatePicker","Date = " + year);
((EditText) findViewById(R.id.tf_date)).setText("Date = " + year);
}
9 个回答
高票数
最新
Leszek
修改于2012-07-18 01:25
得票数
64
DatePickerDialog
的构造函数将
DatePickerDialog.OnDateSetListener
作为第二个参数，因此您可能应该在父activity
EditSessionActivity
中(而不是在
DatePickerFragment
中)实现该接口，并更改此行：
return new DatePickerDialog(getActivity(), this, year, month, day);如下所示：
return new DatePickerDialog(getActivity(), (EditSessionActivity)getActivity(), year, month, day);然后，您的活动应该如下所示：
public class EditSessionActivity extends FragmentActivity implements
DatePickerDialog.OnDateSetListener{
public void onDateSet(DatePicker view, int year, int month, int day) {
//use date in your activity
}
Vinicius Paldês
回答于2013-02-07 20:58
得票数
25
我在显示日期选择器的类中简单地覆盖了日期选择器创建中的onDateSet。请看下面的代码：
private OnClickListener onDateClicked() {
return new OnClickListener() {
@Override
public void onClick(View v) {
DialogFragment newFragment = new DatePickerFragment() {
@Override
public void onDateSet(DatePicker view, int year, int month, int day) {
salePaymentCustomView.setBtDateText("" + day + "/" + month+1 + "/" + year);
newFragment.show(getActivity().getSupportFragmentManager(), "datePicker");
}
steps
回答于2013-05-12 07:14
得票数
14
该问题也可以在不将
onDateSet
方法移动到父活动的情况下解决。您只需告诉
DatePickerFragment
在哪里搜索视图：
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) {
// do some stuff for example write on log and update TextField on activity
Log.w("DatePicker","Date = " + year);
((TextView) getActivity().findViewById(R.id.tf_date)).setText("Date = " + year);
}
我还将强制转换的目标从
EditText
更改为
TextView
。这样，您就可以将您的实现重用于不同种类的视图，而不仅仅是
EditText
。
Harsh Parikh
回答于2013-08-26 19:13
得票数
3
public void onDate(View view) {
DialogFragment fragment = new SelectDateFragment();
fragment.show(getFragmentManager(), "Date Picker");
// @SuppressLint("NewApi")
class SelectDateFragment extends DialogFragment implements
DatePickerDialog.OnDateSetListener {
public Dialog onCreateDialog(Bundle savedInstanceState) {
System.out.println("entrering on create dialog");;
return new DatePickerDialog(getActivity(), this, mYear, mMonth,
mDay);//it will return dialog setting date with mYera,MMonth and MDay
@Override
public void onDateSet(android.widget.DatePicker view, int year,
int monthOfYear, int dayOfMonth) {
System.out.println("year=" + year + "day=" + dayOfMonth + "month="
+ monthOfYear);
mYear=year;
mMonth=monthOfYear;
mDay=dayOfMonth;
onPopulateSet(year, monthOfYear + 1, dayOfMonth);
// set the selected date in the edit text
private void onPopulateSet(int year, int i, int dayOfMonth) {
EditText et_setDate;
et_setDate = (EditText) findViewById(R.id.register_et_dob);//register_et_dob:-id name of the edit text
et_setDate.setText(dayOfMonth + "/" + i + "/" + year);
System.out.println("enetring on populate Set");
}
Benny Margalit
修改于2014-01-25 15:43
得票数
10
我对上面的答案有一个更正。而不是像这样返回DatePickerDialog
return new DatePickerDialog(getActivity()，(EditSessionActivity)getActivity()，年、月、日)；
您应该以更通用的方式返回它。
return new DatePickerDialog(getActivity()，(OnDateSetListener)getActivity()，年、月、日)；
只需确保您的活动实现OnDateSetListener接口并覆盖函数onDateSet
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,int dayOfMonth)
Matt
回答于2016-04-17 16:19
得票数
0
我也遇到过类似的问题，但是我的日期选择器是从另一个片段中的对话框片段启动的。这使得使用回调变得非常困难，因为它们希望返回到主活动，而我希望数据返回到前一个对话框片段。
最初，我将新的日期值传递给主活动(使用OnDateSetListener)，并打算使用启动日期选取器的对话框获取它们，但当日期选取器关闭时，该对话框中不会触发生命周期事件。
我得到的结果是在日期选择器中的onDismiss中，实例化一个新的对话框片段，对其调用set results方法，然后启动它。当然，对于这一点，您需要确保在启动日期选择器时之前的片段已被清除。
这是调用日期选择器的dialogFragment
public class NewTrialDialogFragment extends DialogFragment {
public final String LOG_TAG = "NewTrialDialog Fragment";
Button startDateButton;
Integer newYear, newMonth, newDay;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.dialog_new_trial, container, false);
getDialog().setTitle("Dialog New Trial");
startDateButton = (Button) rootView.findViewById(R.id.button_start_date);
startDateButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showDatePickerDialog(v);
//If you exit the datepicker without choosing anything, it returns zeros
if (newYear != null && newMonth != null && newDay != null && newYear != 0) {
startDateButton.setText(newYear + " " + newMonth + " " + newDay);
}else{
startDateButton.setText("Select Start Date");
return rootView;
public void showDatePickerDialog(View v) {
TrialDatePickerDialog newDialog = new TrialDatePickerDialog();
newDialog.show(getActivity().getSupportFragmentManager(), "datePicker");
this.dismiss();
public void setDates(int year, int month, int day){
newYear = year;
newMonth = month;
newDay = day;
}}和日期选择器
public class TrialDatePickerDialog extends DialogFragment implements DatePickerDialog.OnDateSetListener
private final String LOG_TAG = "TrialDatePickerDialog";
int newYear, newMonth, newDay;
@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 TrialDatePickerDialog and return it
return new DatePickerDialog(getActivity(), this , year, month, day);
@Override
public void onDismiss(DialogInterface dialog) {
super.onDismiss(dialog);
FragmentManager fm = getActivity().getSupportFragmentManager();
NewTrialDialogFragment newTrialDialogFragment = new NewTrialDialogFragment();
newTrialDialogFragment.setDates(newYear, newMonth, newDay);
newTrialDialogFragment.show(fm, "new_trial_dialog");
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
newYear = year;
newMonth = monthOfYear;
newDay = dayOfMonth;
}
wvdz
回答于2017-02-22 19:44
得票数
2
Leszek的答案是有效的，但如果对话框是从另一个片段启动的，则不起作用。在这种情况下，您需要在创建对话框的代码中使用
setTargetFragment()
，并在对话框代码中使用
getTargetFragment()
。
在创建对话框的代码中：
DialogFragment dialogFragment = new YourDialogFragment();
dialogFragment.setTargetFragment(YourParentFragment.this, 0);
dialogFragment.show(getFragmentManager(), "mydialog");在DialogFragment代码中：
@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
DatePickerDialog.OnDateSetListener listener = new DatePickerDialog.OnDateSetListener()
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth)
YourParentFragment parentFragment = (YourParentFragment) getTargetFragment();
// Manipulate the parent fragment
// ...
// Get the initial date
// ...
return new DatePickerDialog(getActivity(), listener, year, month, day);
}
Leonid Ustenko
修改于2018-05-31 04:45
得票数
3
如果你必须返回一个片段的结果，而不是一个活动，这里有一个完整的解决方案：
public class DatePickerDialogFragment extends DialogFragment {
private static final String ARGUMENT_YEAR = "ARGUMENT_YEAR";
private static final String ARGUMENT_MONTH = "ARGUMENT_MONTH";
private static final String ARGUMENT_DAY = "ARGUMENT_DAY";
private DatePickerDialog.OnDateSetListener listener;
private int year;
private int month;
private int dayOfMonth;
public static DatePickerDialogFragment newInstance(final int year, final int month, final int dayOfMonth) {
final DatePickerDialogFragment df = new DatePickerDialogFragment();
final Bundle args = new Bundle();
args.putInt(ARGUMENT_YEAR, year);
args.putInt(ARGUMENT_MONTH, month);
args.putInt(ARGUMENT_DAY, dayOfMonth);
df.setArguments(args);
return df;
@Override
public void onCreate(@Nullable final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
retrieveArguments();
private void retrieveArguments() {
final Bundle args = getArguments();
if (args != null) {
year = args.getInt(ARGUMENT_YEAR);
month = args.getInt(ARGUMENT_MONTH);
dayOfMonth = args.getInt(ARGUMENT_DAY);
@Override
public Dialog onCreateDialog(final Bundle savedInstanceState) {
return new DatePickerDialog(getContext(), this.listener, this.year, this.month, this.dayOfMonth);
public void setListener(final DatePickerDialog.OnDateSetListener listener) {
this.listener = listener;
}然后在片段或活动中使用它：
final Calendar c = Calendar.getInstance();
DatePickerDialogFragment datePicker = DatePickerDialogFragment.newInstance(
c.get(Calendar.YEAR),
c.get(Calendar.MONTH),
c.get(Calendar.DAY_OF_MONTH));
datePicker.setListener(this);
datePicker.show(getChildFragmentManager(), null);
Water
回答于2019-11-04 10:42
得票数
0
Kotlin版本。
DatePickerFragment类：
class DatePickerFragment : DialogFragment() {
override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
val c = Calendar.getInstance()
val year = c.get(Calendar.YEAR)
val month = c.get(Calendar.MONTH)
val day = c.get(Calendar.DAY_OF_MONTH)
return DatePickerDialog(context!!, context!! as MainActivity, year, month, day)
}DatePickerDialog.OnDateSetListener 已移至MainActicity
class MainActivity : AppCompatActivity(), DatePickerDialog.OnDateSetListener {
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