Develop Reference

Custom DatePicker buttons

I would like to highlight that I am looking for a Xamarin solution. I have found Java solutions, but I can't seem to convert them to Xamarin. I want to have the user set their birthday and then have the app calculate their age, and display it as text. I have everything functioning. All I am looking to do is change the text on the "ok" button to "Calculate age." I am able to change the text, but the button doesn't grab the date from the picker then. This is how I create my datepicker:
DatePickerDialog setDate = new DatePickerDialog(this, onDateSet, date.Year, date.Month-1, date.Day);
then I use this method to change the text
setDate.SetButton("calculate age", EventHandler<DialogClickEventArgs>)
I have created an EventHandler called Age use for the second argument. What code do I put in the EventHandler to make the button function like the "ok" button? if I set handler:null the method works, I can also get the method to do other things, change text in textbox for a example. Any solution is welcomed.

Wow. No love for Xamarin? I discovered the solution was much simpler. Following from what I learned here: Change DatePickerDialog's button texts. I began throwing darts into the code and this is what stuck. Where I set handler to null I simply set listener to the dialog object like so. setDate.SetButton ("calculate age", listener:setDate);

CalendarView Issues when Used Directly (Outside of a DatePicker)

I'm using a CalendarView directly, not a DatePicker, b/c its being used as a drop-down/pop-up style dialog where space is factor ( the user clicks a button located to the right of date field, and the CalendarView drops down, appearing directly below the field, aligned/anchored to the button).
There are two show-stopping issues I've ran into, and spent an entire 10 hour day debugging with no resolve.
Issue #1 - Weeks Missing
Weeks appear to missing, and depending on the date, sometimes the week missing will correspond to the "default"/current date (the date the displayed record contains that was loaded from the DB), and so when I display the CalendarView, and call setDate() to auto-select it, no date will appear to be selected (although the CalendarView will be centered around the missing week).
The way I've been fixing this is to manually scroll down, and then back up a few months, and the refresh usually fixes the display. However, I haven't found a way to automate this scrolling, which could be a potential work around. I tried calling setDate() in succession to do this, but it seems to only work on the first call, which brings me to my next issue.
Issue #2 - setDate() Auto-Scrolling Not Working
It seems that only the first call to setDate() will cause the CalendarView to be centered around the corresponding date. If I choose a new date (and store it in private member) and dismiss the popup, and then bring it back up with another dropdown-button click, which will now call setDate() with this new date, then the CalendarView will be centered around the old/previous date, even though the new date is actually hilited (which can be confirmed my manually scrolling down to it).
I can attach code if required, but before spending the time to do so, I just wanted to see if this is a well known issue.
Thank you.

This is just a work-around (also, I've been working in Monodroid/C#, not raw Android)
By first calling SetDate() with a value for the last day of the month previous to the desired display date, and then calling it with the desired date, it seems to work consistently as expected (make sure this date falls between the Max/Min dates of the CalendarView).
However, the second call needs to be posted as a runnable to the UI thread.
Here is some code (note the boolean flags to SetDate, for centering and scroll-animation, neither of which work, hence this work-around):
View view = _inflater.Inflate( Resource.Layout.CalendarViewPicker, null );
CalendarView cvPicker = view.FindViewById<Android.Widget.CalendarView>( Resource.Id.cv_picker );
DateTime lastDay = new DateTime(_date.Year, _date.Month, 1).AddDays(-1);
long lastDayTicks = Ticks( lastDay.Date );
cvPicker.SetDate( lastDayTicks, true, true );
cvPicker.Post( () => {cvPicker.SetDate(Ticks(_date.Date),true,true)} );
Passing _date.Date to Ticks() passes a DateTime with a Time of 12:00am (basically "zeros out" time element), as opposed to passing just _date, which is also a DateTime. Also, a conversion function is needed, since I'm using C#/.NET, to convert the tick-offset
private long Ticks( DateTime date )
{
DateTime _1970 = (new DateTime(1970, 1, 1)).AddDays(-1);
return (date.Ticks - _1970.Ticks) / 10000;
}
Resource.Layout.CalendarViewPicker.axml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="#dimen/calendar_view_width"
android:layout_height="#dimen/calendar_view_height"
android:background="#FF666666">
<Button
android:id="#+id/btn_picker_exit"
android:layout_width="60dp"
android:layout_height="36dp"
android:layout_alignParentTop="true"
android:background="#drawable/cv_button_background"
android:gravity="center"
android:textColor="#FFFFFFFF"
android:textSize="20sp"
android:text="+"/>
<CalendarView
android:id="#+id/cv_picker"
android:layout_width="#dimen/calendar_view_width"
android:layout_height="#dimen/calendar_view_height"
android:shownWeekCount="6"/>
<RelativeLayout/>
My reasoning for the first call to SetDate() with the last day of the previous month, was b/c many times the calendar would popup with the second week of a given month showing as the first visible week, and when scrolling up to see the first week, I would find it missing. So, I figured setting the date with the last day of the previous month might force the first week (ie, the problematic week) to show.
Now with the first week showing, I call SetDate again, but it only works when posted, b/c when posting a runnable to the UI, the event is scheduled to occur after the associated view is rendered. If 2 SetDate()'s are called consecutively (neither in a runnable), say in OnCreate(), then the effects take place before the view is rendered, and so only the second call would take effect, overwriting the first (and therefore loosing the effect of forcing the first week to show).
These two calls also fix the centering/auto-scrolling issue, which is nice too.

TimePicker widget not getting current time

This question is about TimePicker behavior in Android.
To get the value of the Hour and the Minute I use getCurrentHour() and getCurrentMinute().
At first I found out that changes made by the user using the phone keyboard where not registered so calling getCurrentHour() or getCurrentMinute() did not show the values changed in the texboxes inside the widget.
This was quickly solved using setAddStatesFromChildren(true); With this I get those changes.
Now, my problem is that those changes are only registered if timepicker looses focus.
So, getting the value from timepicker inside a button gets a wrong value because it hasn't loose focus.
Any help?
What I need is: Can I force a timepicker to loose focus and get the real written value in text boxes?

I solved it and I write it here for someone who needs it.
Thanks to "Tarun Maheshwari" I found what I needed:
On onCreate do something like this:
MyTimerPicker.setAddStatesFromChildren(true);
On the onClick method, when getting the values, do this:
MyTimerPicker.clearFocus();
int iHour = MyTimerPicker.getCurrentHour();
int iMinute = MyTimerPicker.getCurrentMinute();

Call clearFocus() on the timepicker view after you get onTimeChanged callback.

Android - Get EditText and show dialog

I want my application can get user's input of time (HH:mm) from EditText widget.
Based on this time value my app needs to show a dialog when current time matches entered time.
Gaauwe
*Edit*
I want to place an EditText widget in my app.
A user will fill it with some time value (e.g. 10:30).
Then when real time (10:30) come up a dialog will be shown.

I think you can use the AlarmManager for this.
I d suggest you have a look at some tutorials like these to help you get started
http://michael.theirwinfamily.net/articles/android/android-creating-alarm-alarmmanager
http://android.arnodenhond.com/tutorials/alarm-notification

That is not too difficult. When user finished editing you EditText, read the time value and create instance of AlarmManager with start time calculated as difference between current time and whatever user wrote in the EditText. Better to use TimePicker to avoid parsing user`s input. Add receiver for you AlarmManager, receiver will start Service which will show dialog or do anything you want. You need to use AlarmManager because if your device is sleeping nothing will wake it up except system call like AlarmManager. #Zortkun 's post with links will help you to figure out how manage AlarmManager.

try this :
use the service : then when user enter time starts a service when system time and user entered time match the shows..

You can pull the data out of the EditText with:
findViewById(R.id.yourEditText).getText().toString();
The rest of your question I didn't understand.

RAW WAY!
So when user put text inside edittext and click button, you could save text in this way:
String time = findViewById(R.id.yourEditText).getText().toString();
and start a thread that check for time, and when time is equal to user's string time, you can show a dialog :)
Thread t = new Thread(new Runnable(){
public void run(){
while(new Date().getLocalTime()!=usersTime){ // is just pseudocode
Dialog.show();
}
}
});

I'll try to understand...
Seeing as you know how to pull the text from an EditText, you'll need an if statement.
Something that compares that time to the current time.
if (editTime == realTime) {
Toast.makeText(getApplicationContext(), "RING RING RING",
Toast.LENGTH_SHORT).show();
}
Use something like this:
Read this to figure out how to get a string of current time.

Changing the title on a TimePicker?

I'm trying to look for a solution to change the title on a TimePicker dialog. Right now it says whatever the system time is (ex. "12:23 AM") but I want to change this to something a little more descriptive. Does anyone have any suggestions?

By request. :)
By TimePicker dialog do you mean the
actual TimePickerDialog? Because that
has a setTitle(CharSequence text)
method. The TimePickerDialog is what
is used in the official tutorial.
http://developer.android.com/reference/android/app/AlertDialog.html#setTitle(java.lang.CharSequence)

This question is rather old, but it shows up on Google results if you search this question. So, I thought I'll post my solution.
DatePicker has setCustomTitle(View view), where you can define your own view (e.g. TextView with your custom text) to be used as a title. This one does not update when changing values.

I dont know how to reply to the comments below question, so I use "Answer".
By looking into source code: SourceCode
You may realize that OnTimeChangedListener is implemented by TimePickerDialog.
To avoid title changed while adjusting time, you may derived from TimePickerDialog and override public void onTimeChanged(TimePicker view, int hourOfDay, int minute);
Notice, dont call super version, or it will setTitle again...