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问题:
--- Note to moderators: Today (July 15), I've noticed that someone already faced this problem here. But I'm not sure if it's appropriate to close this as a duplicate, since i think I provided a much better explanation of the issue. I'm not sure if I should edit the other question and paste this content there, but I'm not comfortable changing someone else's question too much. ---
I have something weird here.
I don't think the problem depends on which SDK you build against. The device OS version is what matters.
Problem #1: inconsistency by default
DatePickerDialog was changed (?) in Jelly Bean and now only provides a Done button. Previous versions included a Cancel button, and this may affect user experience (inconsistency, muscle memory from previous Android versions).
Replicate: Create a basic project. Put this in onCreate:
DatePickerDialog picker = new DatePickerDialog(
this,
new OnDateSetListener() {
@Override
public void onDateSet(DatePicker v, int y, int m, int d) {
Log.d("Picker", "Set!");
}
},
2012, 6, 15);
picker.show();
Expected: A Cancel button to appear in the dialog.
Current: A Cancel button does not appear.
Screenshots: 4.0.3 (OK) and 4.1.1 (possibly wrong?).
Problem #2: wrong dismiss behavior
Dialog calls whichever listener it should call indeed, and then always calls OnDateSetListener listener. Canceling still calls the set method, and setting it calls the method twice.
Replicate: Use #1 code, but add code below (you'll see this solves #1, but only visually/UI):
picker.setButton(DialogInterface.BUTTON_NEGATIVE, "Cancel",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Log.d("Picker", "Cancel!");
}
});
Expected:
- Pressing the BACK key or clicking outside the dialog should do nothing.
- Pressing "Cancel" should print Picker Cancel!.
- Pressing "Set" should print Picker Set!.
Current:
- Pressing the BACK key or clicking outside the dialog prints Picker Set!.
- Pressing "Cancel" prints Picker Cancel! and then Picker Set!.
- Pressing "Set" prints Picker Set! and then Picker Set!.
Log lines showing the behavior:
07-15 12:00:13.415: D/Picker(21000): Set!
07-15 12:00:24.860: D/Picker(21000): Cancel!
07-15 12:00:24.876: D/Picker(21000): Set!
07-15 12:00:33.696: D/Picker(21000): Set!
07-15 12:00:33.719: D/Picker(21000): Set!
Other notes and comments
- Wrapping it around a
DatePickerFragment doesn't matter. I simplified the problem for you, but I've tested it.
回答1:
Note: Fixed as of Lollipop, source here. Automated class for use in clients (compatible with all Android versions) updated as well.
TL;DR: 1-2-3 dead easy steps for a global solution:
- Download this class.
- Implement
OnDateSetListener in your activity (or change the class to suit your needs).
Trigger the dialog with this code (in this sample, I use it inside a Fragment):
Bundle b = new Bundle();
b.putInt(DatePickerDialogFragment.YEAR, 2012);
b.putInt(DatePickerDialogFragment.MONTH, 6);
b.putInt(DatePickerDialogFragment.DATE, 17);
DialogFragment picker = new DatePickerDialogFragment();
picker.setArguments(b);
picker.show(getActivity().getSupportFragmentManager(), "frag_date_picker");
And that's all it takes! The reason I still keep my answer as "accepted" is because I still prefer my solution since it has a very small footprint in client code, it addresses the fundamental issue (the listener being called in the framework class), works fine across config changes and it routes the code logic to the default implementation in previous Android versions not plagued by this bug (see class source).
Original answer (kept for historical and didactic reasons):
Bug source
OK, looks like it's indeed a bug and someone else already filled it. Issue 34833.
I've found that the problem is possibly in DatePickerDialog.java. Where it reads:
private void tryNotifyDateSet() {
if (mCallBack != null) {
mDatePicker.clearFocus();
mCallBack.onDateSet(mDatePicker, mDatePicker.getYear(),
mDatePicker.getMonth(), mDatePicker.getDayOfMonth());
}
}
@Override
protected void onStop() {
tryNotifyDateSet();
super.onStop();
}
I'd guess it could have been:
@Override
protected void onStop() {
// instead of the full tryNotifyDateSet() call:
if (mCallBack != null) mDatePicker.clearFocus();
super.onStop();
}
Now if someone can tell me how I can propose a patch/bug report to Android, I'd be glad to. Meanwhile, I suggested a possible fix (simple) as an attached version of DatePickerDialog.java in the Issue there.
Concept to avoid the bug
Set the listener to null in the constructor and create your own BUTTON_POSITIVE button later on. That's it, details below.
The problem happens because DatePickerDialog.java, as you can see in the source, calls a global variable (mCallBack) that stores the listener that was passed in the constructor:
/**
* @param context The context the dialog is to run in.
* @param callBack How the parent is notified that the date is set.
* @param year The initial year of the dialog.
* @param monthOfYear The initial month of the dialog.
* @param dayOfMonth The initial day of the dialog.
*/
public DatePickerDialog(Context context,
OnDateSetListener callBack,
int year,
int monthOfYear,
int dayOfMonth) {
this(context, 0, callBack, year, monthOfYear, dayOfMonth);
}
/**
* @param context The context the dialog is to run in.
* @param theme the theme to apply to this dialog
* @param callBack How the parent is notified that the date is set.
* @param year The initial year of the dialog.
* @param monthOfYear The initial month of the dialog.
* @param dayOfMonth The initial day of the dialog.
*/
public DatePickerDialog(Context context,
int theme,
OnDateSetListener callBack,
int year,
int monthOfYear,
int dayOfMonth) {
super(context, theme);
mCallBack = callBack;
// ... rest of the constructor.
}
So, the trick is to provide a null listener to be stored as the listener, and then roll your own set of buttons (below is the original code from #1, updated):
DatePickerDialog picker = new DatePickerDialog(
this,
null, // instead of a listener
2012, 6, 15);
picker.setCancelable(true);
picker.setCanceledOnTouchOutside(true);
picker.setButton(DialogInterface.BUTTON_POSITIVE, "OK",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Log.d("Picker", "Correct behavior!");
}
});
picker.setButton(DialogInterface.BUTTON_NEGATIVE, "Cancel",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Log.d("Picker", "Cancel!");
}
});
picker.show();
Now it will work because of the possible correction that I posted above.
And since DatePickerDialog.java checks for a null whenever it reads mCallback (since the days of API 3/1.5 it seems --- can't check Honeycomb of course), it won't trigger the exception. Considering Lollipop fixed the issue, I'm not going to look into it: just use the default implementation (covered in the class I provided).
At first I was afraid of not calling the clearFocus(), but I've tested here and the Log lines were clean. So that line I proposed may not even be necessary after all, but I don't know.
Compatibility with previous API levels (edited)
As I pointed in the comment below, that was a concept, and you can download the class I'm using from my Google Drive account. The way I used, the default system implementation is used on versions not affected by the bug.
I took a few assumptions (button names etc.) that are suitable for my needs because I wanted to reduce boilerplate code in client classes to a minimum. Full usage example:
class YourActivity extends SherlockFragmentActivity implements OnDateSetListener
// ...
Bundle b = new Bundle();
b.putInt(DatePickerDialogFragment.YEAR, 2012);
b.putInt(DatePickerDialogFragment.MONTH, 6);
b.putInt(DatePickerDialogFragment.DATE, 17);
DialogFragment picker = new DatePickerDialogFragment();
picker.setArguments(b);
picker.show(getActivity().getSupportFragmentManager(), "fragment_date_picker");
回答2:
I'm gonna add my own riff on the solution David Cesarino posted, in case you're not using Fragments, and want an easy way to fix it in all versions (2.1 thru 4.1):
public class FixedDatePickerDialog extends DatePickerDialog {
//I use a Calendar object to initialize it, but you can revert to Y,M,D easily
public FixedDatePickerDialog(Calendar dateToShow, Context context, OnDateSetListener callBack) {
super(context, null, dateToShow.get(YEAR), dateToShow.get(MONTH), dateToShow.get(DAY_OF_MONTH));
initializePicker(callBack);
}
public FixedDatePickerDialog(Calendar dateToShow, Context context, int theme,
OnDateSetListener callBack) {
super(context, theme, null, dateToShow.get(YEAR), dateToShow.get(MONTH), dateToShow.get(DAY_OF_MONTH));
initializePicker(callBack);
}
private void initializePicker(final OnDateSetListener callback) {
try {
//If you're only using Honeycomb+ then you can just call getDatePicker() instead of using reflection
Field pickerField = DatePickerDialog.class.getDeclaredField("mDatePicker");
pickerField.setAccessible(true);
final DatePicker picker = (DatePicker) pickerField.get(this);
this.setCancelable(true);
this.setButton(DialogInterface.BUTTON_NEGATIVE, getContext().getText(android.R.string.cancel), (OnClickListener) null);
this.setButton(DialogInterface.BUTTON_POSITIVE, getContext().getText(android.R.string.ok),
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
picker.clearFocus(); //Focus must be cleared so the value change listener is called
callback.onDateSet(picker, picker.getYear(), picker.getMonth(), picker.getDayOfMonth());
}
});
} catch (Exception e) { /* Reflection probably failed*/ }
}
}
回答3:
Until the bug will be fixed I suggest not to use DatePickerDialog or TimePickerDialog. Use custom made AlertDialog with TimePicker/DatePicker widget;
Change TimePickerDialog with;
final TimePicker timePicker = new TimePicker(this);
timePicker.setIs24HourView(true);
timePicker.setCurrentHour(20);
timePicker.setCurrentMinute(15);
new AlertDialog.Builder(this)
.setTitle("Test")
.setPositiveButton(android.R.string.ok, new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Log.d("Picker", timePicker.getCurrentHour() + ":"
+ timePicker.getCurrentMinute());
}
})
.setNegativeButton(android.R.string.cancel,
new OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
Log.d("Picker", "Cancelled!");
}
}).setView(timePicker).show();
Change DatePickerDialog with;
final DatePicker datePicker = new DatePicker(this);
datePicker.init(2012, 10, 5, null);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
datePicker.setCalendarViewShown(false);
}
new AlertDialog.Builder(this)
.setTitle("Test")
.setPositiveButton(android.R.string.ok, new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Log.d("Picker", datePicker.getYear() + " "
+ (datePicker.getMonth() + 1) + " "
+ datePicker.getDayOfMonth());
}
})
.setNegativeButton(android.R.string.cancel,
new OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
Log.d("Picker", "Cancelled!");
}
}).setView(datePicker).show();
回答4:
The one for TimePicker based on the solution by David Cesarino , "TL;DR: 1-2-3 dead easy steps for a global solution"
TimePickerDialog does not provide the functionality like DatePickerDialog.getDatePicker.
So, OnTimeSetListener listener has to be provided.
Just to keep the similarity with DatePicker workaround solution, I have maintained the old mListener concept. You can change it if you need to.
Calling and Listener is same as original solution.
Just include
import android.app.TimePickerDialog;
import android.app.TimePickerDialog.OnTimeSetListener;
extend parent class,
... implements OnDateSetListener, OnTimeSetListener
Implement
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
...
}
example calling
Calendar cal = Calendar.getInstance();
int hour = cal.get(Calendar.HOUR_OF_DAY);
int minute = cal.get(Calendar.MINUTE);
Bundle b = new Bundle();
b.putInt(TimePickerDialogFragment.HOUR, hour);
b.putInt(TimePickerDialogFragment.MINUTE, minute);
DialogFragment picker = new TimePickerDialogFragment();
picker.setArguments(b);
picker.show(getSupportFragmentManager(), "frag_time_picker");
(Updated to handle cancel)
public class TimePickerDialogFragment extends DialogFragment {
public static final String HOUR = "Hour";
public static final String MINUTE = "Minute";
private boolean isCancelled = false; //Added to handle cancel
private TimePickerDialog.OnTimeSetListener mListener;
//Added to handle parent listener
private TimePickerDialog.OnTimeSetListener mTimeSetListener = new TimePickerDialog.OnTimeSetListener() {
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
if (!isCancelled)
{
mListener.onTimeSet(view,hourOfDay,minute);
}
}
};
//
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
this.mListener = (TimePickerDialog.OnTimeSetListener) activity;
}
@Override
public void onDetach() {
this.mListener = null;
super.onDetach();
}
@TargetApi(11)
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
Bundle b = getArguments();
int h = b.getInt(HOUR);
int m = b.getInt(MINUTE);
final TimePickerDialog picker = new TimePickerDialog(getActivity(), getConstructorListener(), h, m,DateFormat.is24HourFormat(getActivity()));
//final TimePicker timePicker = new TimePicker(getBaseContext());
if (hasJellyBeanAndAbove()) {
picker.setButton(DialogInterface.BUTTON_POSITIVE,
getActivity().getString(android.R.string.ok),
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
isCancelled = false; //Cancel flag, used in mTimeSetListener
}
});
picker.setButton(DialogInterface.BUTTON_NEGATIVE,
getActivity().getString(android.R.string.cancel),
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
isCancelled = true; //Cancel flag, used in mTimeSetListener
}
});
}
return picker;
}
private boolean hasJellyBeanAndAbove() {
return Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN;
}
private TimePickerDialog.OnTimeSetListener getConstructorListener() {
return hasJellyBeanAndAbove() ? mTimeSetListener : mListener; //instead of null, mTimeSetListener is returned.
}
}
回答5:
In case anyone wants a quick workaround, here's the code I used:
public void showCustomDatePicker () {
final DatePicker mDatePicker = (DatePicker) getLayoutInflater().
inflate(R.layout.date_picker_view, null);
//Set an initial date for 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);
//Set the date now
mDatePicker.updateDate(year, month, day);
//create the dialog
AlertDialog.Builder mBuilder = new Builder(this);
//set the title
mBuilder.setTitle(getString(R.string.date_picker_title))
//set our date picker
.setView(mDatePicker)
//set the buttons
.setPositiveButton(android.R.string.ok, new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//whatever method you choose to handle the date changes
//the important thing to know is how to retrieve the data from the picker
handleOnDateSet(mDatePicker.getYear(),
mDatePicker.getMonth(),
mDatePicker.getDayOfMonth());
}
})
.setNegativeButton(android.R.string.cancel, new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
})
//create the dialog and show it.
.create().show();
}
Where layout.date_picker_view is a simple layout resource with a DatePicker as it's only element:
<!xml version="1.0" encoding="utf-8">
<DatePicker xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/date_picker"
android:layout_width="fill_parent"
android:spinnersShown="true"
android:calendarViewShown="false"
android:layout_height="fill_parent"/>
Here's the full tutorial in case you are interested.
回答6:
My simple solution. When you want to get it firing again just run "resetFired" (say when opening the dialog again).
private class FixedDatePickerDialogListener implements DatePickerDialog.OnDateSetListener{
private boolean fired;
public void resetFired(){
fired = false;
}
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
if (fired) {
Log.i("DatePicker", "Double fire occurred.");
return;//ignore and return.
}
//put your code here to handle onDateSet
fired = true;//first time fired
}
}
回答7:
According to Ankur Chaudhary's brilliant answer on the similar TimePickerDialog issue, if we checked inside onDateSet if the given view isShown() or not, it will solve the whole issue with the minimal effort, with no need for extending the picker or checking for some hideous flags going around the code or even checking for the OS version, just do the following:
public void onDateSet(DatePicker view, int year, int month, int day) {
if (view.isShown()) {
// read the date here :)
}
}
and of course the same can be done for onTimeSet as per Ankur's answer
回答8:
The way I managed this situation was using a flag and overriding the onCancel and onDismiss methods.
onCancel gets called only when the user touches outside the dialog or the back button.
onDismiss always gets called
Setting a flag in the onCancel method can help filter in the onDismiss method the user's intent: cancel action or done action. Below some code that shows the idea.
public class DatePickerDialogFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {
private boolean cancelDialog = false;
private int year;
private int month;
private int day;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
DatePickerDialog dpd = new DatePickerDialog(getActivity(), this, year, month, day);
return dpd;
}
public void setDatePickerDate(int year, int month, int day) {
this.year = year;
this.month = month;
this.day = day;
}
@Override
public void onCancel(DialogInterface dialog) {
super.onCancel(dialog);
cancelDialog = true;
}
@Override
public void onDismiss(DialogInterface dialog) {
super.onDismiss(dialog);
if (!cancelDialog) {
#put the code you want to execute if the user clicks the done button
}
}
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
setDatePickerDate(year, monthOfYear, dayOfMonth);
}
}
回答9:
There is a very simple workaround, if your application does not use the action bar. Note by the way, that some apps rely on this functionality to work, because cancelling out of the date picker has a special meaning (e.g. it clears the date field to an empty string, which for some apps is a valid and meaningful type of input) and using boolean flags to prevent the date from being set twice on OK will not help you in this case.
Re. the actual fix, you do not have to create new buttons or your own dialog. The point is to be compatible with both, the older versions of Android, the buggy ones (4.) and any future ones, though the latter is impossible to be sure about, of course.
Note that in Android 2., the onStop() for android.app.Dialog does nothing at all, and in 4.* it does mActionBar.setShowHideAnimationEnabled(false) which is important only if your app has an action bar. The onStop() in DatePickerDialog, which inherits from Dialog, only contributes mDatePicker.clearFocus() (as of the latest fix to Android sources 4.3), which does not seem essential.
Therefore replacing onStop() with a method that does nothing should in many instances fix your app and ensure that it will remain so for the foreseeable future. Thus simply extend DatePickerDialog class with your own and override onStop() whit a dummy method. You will also have to provide one or two constructors, as per your requirements.
Note also that one should not be tempted to try to overdo this fix by e.g. attempting to do something with the activity bar directly, as this would limit your compatibility to the latest versions of Android only. Also note that it would be nice to be able to call the super for DatePicker's onStop() because the bug is only in the onStop() in DatePickerDialog itself, but not in DatePickerDialog's super class. However, this would require you to call super.super.onStop() from your custom class, which Java will not let you do, as it goes against the encapsulation philosophy :)
Below is my little class that I used to verride DatePickerDialog.
I hope this comment would be useful for somebody.
Wojtek Jarosz
public class myDatePickerDialog extends DatePickerDialog {
public myDatePickerDialog(Context context, OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth) {
super(context, callBack, year, monthOfYear, dayOfMonth);
}
@Override
protected void onStop() {
// Replacing tryNotifyDateSet() with nothing - this is a workaround for Android bug https://android-review.googlesource.com/#/c/61270/A
// Would also like to clear focus, but we cannot get at the private members, so we do nothing. It seems to do no harm...
// mDatePicker.clearFocus();
// Now we would like to call super on onStop(), but actually what we would mean is super.super, because
// it is super.onStop() that we are trying NOT to run, because it is buggy. However, doing such a thing
// in Java is not allowed, as it goes against the philosophy of encapsulation (the Creators never thought
// that we might have to patch parent classes from the bottom up :)
// However, we do not lose much by doing nothing at all, because in Android 2.* onStop() in androd.app.Dialog //actually
// does nothing and in 4.* it does:
// if (mActionBar != null) mActionBar.setShowHideAnimationEnabled(false);
// which is not essential for us here because we use no action bar... QED
// So we do nothing and we intend to keep this workaround forever because of users with older devices, who might
// run Android 4.1 - 4.3 for some time to come, even if the bug is fixed in later versions of Android.
}
}
回答10:
Try the below concepts.
DatePickerDialog picker = new DatePickerDialog(
this,
new OnDateSetListener() {
@Override
public void onDateSet(DatePicker v, int y, int m, int d) {
Log.d("Picker", "Set!");
}
},
2012, 6, 15);
picker.show();
the onDateSet() method calls twice (if u are checking in emulator.it calls twice.If are using real device then it will call correctly single time.If you are using emulator then use the counter.if you are working in real device then ignore counter variable.For real device its working for me.)
when user clicks the button in DatePickerDialog .
for this you should maintain a counter value and nothing do when the mothod calls first time and perform the operation when the method calls 2nd time.
Refer the below coding snippets
static int counter=0; //Counter will be declared globally.
DatePickerDialog picker = new DatePickerDialog(
this,
new OnDateSetListener() {
@Override
public void onDateSet(DatePicker v, int y, int m, int d) {
counter++;
if(counter==1) return;
counter=0;
//Do the operations here
}
},
2012, 6, 15);
picker.show();
For cancelling datepicker dilalog its working for me.For emulator its not wokring
DialogInterface.OnClickListener dialogOnClickListener=new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
if(which==Dialog.BUTTON_NEGATIVE)
{
Log.i(tagName, "dialog negative button clicked");
dialog.dismiss();
}
}
};
mDatePickerDialog.setButton(Dialog.BUTTON_NEGATIVE, "Cancel", dialogOnClickListener);
Its working for me for a real device.But for emulator its not working correctly.I think its an android emulator bug.
回答11:
A simple solution would be using a boolean to skip second run
boolean isShow = false; // define global variable
// when showing time picker
TimePickerDialog timeDlg = new TimePickerDialog( this, new OnTimeSetListener()
{
@Override
public void onTimeSet( TimePicker view, int hourOfDay, int minute )
{
if ( isShow )
{
isShow = false;
// your code
}
}
}, 8, 30, false );
timeDlg.setButton( TimePickerDialog.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener()
{
@Override
public void onClick( DialogInterface dialog, int which )
{
isShow = false;
}
} );
timeDlg.setButton( TimePickerDialog.BUTTON_POSITIVE, "Set", new DialogInterface.OnClickListener()
{
@Override
public void onClick( DialogInterface dialog, int which )
{
isShow = true;
}
} );
timeDlg.show();
回答12:
You can override onCancel() and use setOnDismissListener() to detect negative user actions. And with a DatePickerDialog.BUTTON_POSITIVE you know that the user wants to set a new date.
DatePickerDialog mDPD = new DatePickerDialog(
getActivity(), mOnDateSetListener, mYear, mMonth, mDay);
mDPD.setOnCancelListener(new OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
// do something onCancek
setDate = false;
}
});
mDPD.setOnDismissListener(new OnDismissListener() {
@Override
public void onDismiss(DialogInterface arg0) {
// do something onDismiss
setDate = false;
}
});
mDPD.setButton(DatePickerDialog.BUTTON_POSITIVE, "Finish", new DatePickerDialog.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// user set new date
setDate = true;
}
});
then check for setDate:
public void onDateSet(DatePicker view, int year, int month, int day) {
if(setDate){
//do something with new date
}
}
回答13:
Here is my workaround class for DatePickerDialog on cancel button as well as abandoning it by back button. Copy&use in style of DatePickerDialog (Because the listener is stateful, we must create new instance when use, otherwise more code is required to make it it works)
Use:
new FixedDatePickerDialog(this,
new FixedOnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year,
int monthOfYear, int dayOfMonth) {
if (isOkSelected()) {
// when DONE button is clicked
}
}
}, year, month, day).show();
Class:
public class FixedDatePickerDialog extends DatePickerDialog {
private final FixedOnDateSetListener fixedCallback;
public FixedDatePickerDialog(Context context,
FixedOnDateSetListener callBack, int year, int monthOfYear,
int dayOfMonth) {
super(context, callBack, year, monthOfYear, dayOfMonth);
fixedCallback = callBack;
this.setButton(DialogInterface.BUTTON_NEGATIVE,
context.getString(R.string.cancel), this);
this.setButton(DialogInterface.BUTTON_POSITIVE,
context.getString(R.string.done), this);
}
@Override
public void onClick(DialogInterface dialog, int which) {
if (which == BUTTON_POSITIVE) {
fixedCallback.setOkSelected(true);
} else {
fixedCallback.setOkSelected(false);
}
super.onClick(dialog, which);
}
public abstract static class FixedOnDateSetListener implements
OnDateSetListener {
private boolean okSelected = false;
@Override
abstract public void onDateSet(DatePicker view, int year,
int monthOfYear, int dayOfMonth);
public void setOkSelected(boolean okSelected) {
this.okSelected = okSelected;
}
public boolean isOkSelected() {
return okSelected;
}
}
}
回答14:
I'm using date pickers, time pickers and number pickers. The number pickers call onValueChanged whenever the user selects a number, before the picker is dismissed, so I already had structure like this to do something with the value only when the picker is dismissed:
public int interimValue;
public int finalValue;
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
this.interimValue = newVal;
}
public void onDismiss(DialogInterface dialog) {
super.onDismiss(dialog);
this.finalValue = this.interimValue;
}
I extended this to set custom onClickListeners for my buttons, with an argument to see which button was clicked. Now I can check which button was tapped before I set my final value:
public int interimValue;
public int finalValue;
public boolean saveButtonClicked;
public void setup() {
picker.setButton(DialogInterface.BUTTON_POSITIVE, getString(R.string.BUTTON_SAVE), new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
picker.onClick(dialog, which); // added for Android 5.0
onButtonClicked(true);
}
});
picker.setButton(DialogInterface.BUTTON_NEGATIVE, getString(R.string.BUTTON_CANCEL), new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
picker.onClick(dialog, which); // added for Android 5.0
onButtonClicked(false);
}
});
}
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
this.interimValue = newVal;
}
public void onButtonClicked(boolean save) {
this.saveButtonClicked = save;
}
public void onDismiss(DialogInterface dialog) {
super.onDismiss(dialog);
if (this.saveButtonClicked) {
// save
this.finalValue = this.interimValue;
} else {
// cancel
}
}
And then I extended that to work with the date and time types for date and time pickers as well as the int type for number pickers.
I posted this because I thought it was simpler than some of the solutions above, but now that I've included all the code, I guess it's not much simpler! But it fit nicely into the structure I already had.
Update for Lollipop: Apparently this bug doesn't happen on all Android 4.1-4.4 devices, because I received a few reports from users whose date and time pickers weren't calling the onDateSet and onTimeSet callbacks. And the bug was officially fixed in Android 5.0. My approach only worked on devices where the bug is present, because my custom buttons didn't call the dialog's onClick handler, which is the only place that onDateSet and onTimeSet are called when the bug is not present. I updated my code above to call the dialog's onClick, so now it works whether or not the bug is present.
回答15:
I liked David Cesarino's answer above, but wanted something that was a drop in replacement for the broken dialog and would work on any dialog that might be missing cancel / have incorrect cancel behavior. Here are derived classes for DatePickerDialog / TimePickerDialog that should work as drop in replacements. These are not custom views. It uses the system dialog, but just changes the cancel / back button behavior to work as expected.
This should work on API level 3 and higher. So, basically any version of Android (I tested it on jellybean and lollipop specifically).
DatePickerDialog:
package snappy_company_name_here;
import android.content.Context;
import android.content.DialogInterface;
import android.widget.DatePicker;
/**
* This is a modified version of DatePickerDialog that correctly handles cancellation behavior since it's broken on jellybean and
* kitkat date pickers.
*
* Here is the bug: http://code.google.com/p/android/issues/detail?id=34833
* Here is an SO post with a bunch of details: http://stackoverflow.com/questions/11444238/jelly-bean-datepickerdialog-is-there-a-way-to-cancel
*
* @author stuckj, created on 5/5/15.
*/
public class DatePickerDialog extends android.app.DatePickerDialog implements DialogInterface.OnClickListener
{
final CallbackHelper callbackHelper;
// NOTE: Must be static since we're using it in a super constructor call. Which is annoying, but necessary
private static class CallbackHelper implements OnDateSetListener
{
private final OnDateSetListener callBack;
private boolean dialogButtonPressHandled = false; // To prevent setting the date when the dialog is dismissed...
// NOTE: Must be static since we're using it in a super constructor call. Which is annoying, but necessary
public CallbackHelper(final OnDateSetListener callBack)
{
this.callBack = callBack;
}
@Override
public void onDateSet(final DatePicker view, final int year, final int monthOfYear, final int dayOfMonth)
{
if (!dialogButtonPressHandled && (callBack != null))
{
callBack.onDateSet(view, year, monthOfYear, dayOfMonth);
}
}
}
/**
* Sets the positive and negative buttons to use the dialog callbacks we define.
*/
private void setButtons(final Context context)
{
setButton(DialogInterface.BUTTON_NEGATIVE, context.getString(android.R.string.cancel), this);
setButton(DialogInterface.BUTTON_POSITIVE, context.getString(android.R.string.ok), this);
}
@Override
public void onClick(final DialogInterface dialog, final int which)
{
// ONLY call the super method in the positive case...
if (which == DialogInterface.BUTTON_POSITIVE)
{
super.onClick(dialog, which);
}
callbackHelper.dialogButtonPressHandled = true;
}
@Override
public void onBackPressed()
{
getButton(DialogInterface.BUTTON_NEGATIVE).performClick();
}
// Need this so we can both pass callbackHelper to the super class and save it off as a variable.
private DatePickerDialog(final Context context,
final OnDateSetListener callBack,
final int year,
final int monthOfYear,
final int dayOfMonth,
final CallbackHelper callbackHelper)
{
super(context, callbackHelper, year, monthOfYear, dayOfMonth);
this.callbackHelper = callbackHelper;
setButtons(context);
}
/**
* @param context The context the dialog is to run in.
* @param callBack How the parent is notified that the date is set.
* @param year The initial year of the dialog.
* @param monthOfYear The initial month of the dialog.
* @param dayOfMonth The initial day of the dialog.
*/
public DatePickerDialog(final Context context,
final OnDateSetListener callBack,
final int year,
final int monthOfYear,
final int dayOfMonth)
{
this(context, callBack, year, monthOfYear, dayOfMonth, new CallbackHelper(callBack));
}
// Need this so we can both pass callbackHelper to the super class and save it off as a variable.
private DatePickerDialog(final Context context, final int theme, final OnDateSetListener listener, final int year,
final int monthOfYear, final int dayOfMonth, final CallbackHelper callbackHelper)
{
super(context, theme, callbackHelper, year, monthOfYear, dayOfMonth);
this.callbackHelper = callbackHelper;
setButtons(context);
}
/**
* @param context The context the dialog is to run in.
* @param theme the theme to apply to this dialog
* @param listener How the parent is notified that the date is set.
* @param year The initial year of the dialog.
* @param monthOfYear The initial month of the dialog.
* @param dayOfMonth The initial day of the dialog.
*/
public DatePickerDialog(final Context context, final int theme, final OnDateSetListener listener, final int year,
final int monthOfYear, final int dayOfMonth)
{
this(context, theme, listener, year, monthOfYear, dayOfMonth, new CallbackHelper(listener));
}
}
TimePickerDialog:
package snappy_company_name_here;
import android.content.Context;
import android.content.DialogInterface;
import android.widget.TimePicker;
/**
* This is a modified version of TimePickerDialog that correctly handles cancellation behavior since it's broken on jellybean and
* kitkat date pickers.
*
* Here is the bug: http://code.google.com/p/android/issues/detail?id=34833
* Here is an SO post with a bunch of details: http://stackoverflow.com/questions/11444238/jelly-bean-datepickerdialog-is-there-a-way-to-cancel
*
* @author stuckj, created on 5/5/15.
*/
public class TimePickerDialog extends android.app.TimePickerDialog implements DialogInterface.OnClickListener
{
final CallbackHelper callbackHelper;
// NOTE: Must be static since we're using it in a super constructor call. Which is annoying, but necessary
private static class CallbackHelper implements OnTimeSetListener
{
private final OnTimeSetListener callBack;
private boolean dialogButtonPressHandled = false; // To prevent setting the date when the dialog is dismissed...
// NOTE: Must be static since we're using it in a super constructor call. Which is annoying, but necessary
public CallbackHelper(final OnTimeSetListener callBack)
{
this.callBack = callBack;
}
@Override
public void onTimeSet(final TimePicker view, final int hourOfDay, final int minute)
{
if (!dialogButtonPressHandled && (callBack != null))
{
callBack.onTimeSet(view, hourOfDay, minute);
}
}
}
/**
* Sets the positive and negative buttons to use the dialog callbacks we define.
*/
private void setButtons(final Context context)
{
setButton(DialogInterface.BUTTON_NEGATIVE, context.getString(android.R.string.cancel), this);
setButton(DialogInterface.BUTTON_POSITIVE, context.getString(android.R.string.ok), this);
}
@Override
public void onClick(final DialogInterface dialog, final int which)
{
// ONLY call the super method in the positive case...
if (which == DialogInterface.BUTTON_POSITIVE)
{
super.onClick(dialog, which);
}
callbackHelper.dialogButtonPressHandled = true;
}
@Override
public void onBackPressed()
{
getButton(DialogInterface.BUTTON_NEGATIVE).performClick();
}
// Need this so we can both pass callbackHelper to the super class and save it off as a variable.
private TimePickerDialog(final Context context,
final OnTimeSetListener callBack,
final int hourOfDay, final int minute, final boolean is24HourView, final CallbackHelper callbackHelper)
{
super(context, callbackHelper, hourOfDay, minute, is24HourView);
this.callbackHelper = callbackHelper;
setButtons(context);
}
/**
* @param context Parent.
* @param callBack How parent is notified.
* @param hourOfDay The initial hour.
* @param minute The initial minute.
* @param is24HourView Whether this is a 24 hour view, or AM/PM.
*/
public TimePickerDialog(final Context context,
final OnTimeSetListener callBack,
final int hourOfDay, final int minute, final boolean is24HourView)
{
this(context, callBack, hourOfDay, minute, is24HourView, new CallbackHelper(callBack));
}
// Need this so we can both pass callbackHelper to the super class and save it off as a variable.
private TimePickerDialog(final Context context, final int theme, final OnTimeSetListener callBack, final int hourOfDay,
final int minute, final boolean is24HourView, final CallbackHelper callbackHelper)
{
super(context, theme, callbackHelper, hourOfDay, minute, is24HourView);
this.callbackHelper = callbackHelper;
setButtons(context);
}
/**
* @param context Parent.
* @param theme the theme to apply to this dialog
* @param callBack How parent is notified.
* @param hourOfDay The initial hour.
* @param minute The initial minute.
* @param is24HourView Whether this is a 24 hour view, or AM/PM.
*/
public TimePickerDialog(final Context context, final int theme, final OnTimeSetListener callBack, final int hourOfDay,
final int minute, final boolean is24HourView)
{
this(context, theme, callBack, hourOfDay, minute, is24HourView, new CallbackHelper(callBack));
}
}
回答16:
My working version with ClearButton using Lambda Expressions:
public class DatePickerFragment extends DialogFragment {
private OnDateSelectListener dateSelectListener;
private OnDateClearListener dateClearListener;
public void setDateSelectListener(OnDateSelectListener dateSelectListener) {
this.dateSelectListener = dateSelectListener;
}
public void setDateClearListener(OnDateClearListener dateClearListener) {
this.dateClearListener = dateClearListener;
}
@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
DatePickerDialog dialog = new DatePickerDialog(getActivity(), null, year, month, day);
dialog.setCancelable(true);
dialog.setCanceledOnTouchOutside(true);
dialog.setTitle("Select Date");
dialog.setButton(BUTTON_POSITIVE, ("Done"), (dialog1, which) -> {
DatePicker dp = dialog.getDatePicker();
dialog.dismiss();
dateSelectListener.onDateSelect(dp.getYear(), dp.getMonth(), dp.getDayOfMonth());
});
dialog.setButton(BUTTON_NEUTRAL, ("Clear"), (dialog1, which) -> {
dialog.dismiss();
dateClearListener.onDateClear();
});
dialog.setButton(BUTTON_NEGATIVE, ("Cancel"), (dialog1, which) -> {
if (which == DialogInterface.BUTTON_NEGATIVE) {
dialog.cancel();
}
});
dialog.getDatePicker().setCalendarViewShown(false);
return dialog;
}
public interface OnDateClearListener {
void onDateClear();
}
public interface OnDateSelectListener {
void onDateSelect(int year, int monthOfYear, int dayOfMonth);
}
}
回答17:
For TimePickerDialog the workaround can be as follows:
TimePickerDialog createTimePickerDialog(Context context, int themeResId, TimePickerDialog.OnTimeSetListener orignalListener,
int hourOfDay, int minute, boolean is24HourView) {
class KitKatTimeSetListener implements TimePickerDialog.OnTimeSetListener {
private int hour;
private int minute;
private KitKatTimeSetListener() {
}
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
this.hour = hourOfDay;
this.minute = minute;
}
private int getHour() { return hour; }
private int getMinute() {return minute; }
};
KitKatTimeSetListener kitkatTimeSetListener = new KitKatTimeSetListener();
TimePickerDialog timePickerDialog = new TimePickerDialog(context, themeResId, kitkatTimeSetListener, hourOfDay, minute, is24HourView);
timePickerDialog.setButton(DialogInterface.BUTTON_POSITIVE, context.getString(android.R.string.ok), (dialog, which) -> {
timePickerDialog.onClick(timePickerDialog, DialogInterface.BUTTON_POSITIVE);
orignalListener.onTimeSet(new TimePicker(context), kitkatTimeSetListener.getHour(), kitkatTimeSetListener.getMinute());
dialog.cancel();
});
timePickerDialog.setButton(DialogInterface.BUTTON_NEGATIVE, context.getString(android.R.string.cancel), (dialog, which) -> {
dialog.cancel();
});
return timePickerDialog;
}
I delegate all events to wrapper KitKatSetTimeListener, and only fire back to original OnTimeSetListener in case BUTTON_POSITIVE is clicked.
回答18:
After testing some of the sugestions posted here, I personally think this solution is the most simple.
I pass "null" as my listener in the DatePickerDialog constructor, and then when I click the "OK" button I call my onDateSearchSetListener:
datePickerDialog = new DatePickerDialog(getContext(), null, dateSearch.get(Calendar.YEAR), dateSearch.get(Calendar.MONTH), dateSearch.get(Calendar.DAY_OF_MONTH));
datePickerDialog.setCancelable(false);
datePickerDialog.setButton(DialogInterface.BUTTON_POSITIVE, getString(R.string.dialog_ok), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Log.d("Debug", "Correct");
onDateSearchSetListener.onDateSet(datePickerDialog.getDatePicker(), datePickerDialog.getDatePicker().getYear(), datePickerDialog.getDatePicker().getMonth(), datePickerDialog.getDatePicker().getDayOfMonth());
}
});
datePickerDialog.setButton(DialogInterface.BUTTON_NEGATIVE, getString(R.string.dialog_cancel), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Log.d("Debug", "Cancel");
dialog.dismiss();
}
});
回答19:
I know this post has been here for almost a year but I thought I should post my findings.
You could still keep the listener(instead of setting it to mull) and still have this work as expected. The key is to implicitly set the "OK" or(and) the "cancel" buttons. I tested it and it works gratefully for me. The listener does not get fired twice.
Look at this example,
private void setTime(){
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
final TimePickerDialog timepicker = new TimePickerDialog(this.getActivity(),
timePickerListener,
hour,
minute,
DateFormat.is24HourFormat(getActivity()));
timepicker.setButton(DialogInterface.BUTTON_POSITIVE, "Print", new
android.content.DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialog,int which) {
print = true;
timepicker.dismiss();
}
});
timepicker.setButton(DialogInterface.BUTTON_NEGATIVE, "Cancel", new
android.content.DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialog,int which){
print = false;
timepicker.dismiss();
}
});
timepicker.setCancelable(false);
timepicker.show();
}
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