1. Mike Bluestein
Developer/Writer
Xamarin
mike.bluestein@xamarin.com
Xamarin.Mobile API
@mikebluestein

2. Xamarin.Mobile
• Cross Platform API
Xamarin.iOS
Xamarin.Android
Windows Store Applications
Windows Phone 8
Windows Phone 7.1
• Abstracts common device features

3. Now Open Source!

4. Architecture
Contacts
Xamarin.Mobile
Geolocation Camera

5. Contacts

6. Contacts
• AddressBook
RequestPermission
• Contact
Phone
Email
Address
Website
Relationship

7. Contacts
• Maps to native implementation on each platform
• AddressBook implements IQueryable
• LINQ

8. ABAddressBookRef ab = ABAddressBookCreate();
CFStringRef name = CFSTR ("Smith");
CFArrayRef smiths = ABAddressBookCopyPeopleWithName(ab, name);
CFRelease (name);
int count = CFArrayGetCount(smiths);
for (int i = 0; i < count; ++i) {
ABRecordRef person = (ABRecordRef)CFArrayGetValueAtIndex(smiths, (CFIndex)i);
if (ABRecordGetRecordType(person) != kABPersonType)
continue;
NSString *name = (NSString*)ABRecordCopyCompositeName(person);
NSLog ("%@n", name);
[name release];
ABMultiValueRef phoneNumberProp = ABRecordCopyValue(person, kABPersonPhoneProperty);
NSArray* numbers = (NSArray*)ABMultiValueCopyArrayOfAllValues(phoneNumberProp);
CFRelease(phoneNumberProp);
for (NSString *pvalue in numbers)
NSLog ("Phone: %@n", pvalue);
[numbers release];
ABMultiValueRef emailProp = ABRecordCopyValue(person, kABPersonEmailProperty);
NSArray* emails = (NSArray*)ABMultiValueCopyArrayOfAllValues(emailProp);
CFRelease(emailProp);
for (NSString *evalue in emails)
NSLog ("Email: %@n");
[emails release];
}
CFRelease (ab);
CFRelease (smiths);
Contacts - iOS

9. Contacts - Android
ContentResolver content= getContentResolver();
Cursor ncursor = null;
try {
ncursor = content.query (ContactsContract.Data.CONTENT_URI,
new String[] { ContactsContract.Data.MIMETYPE, ContactsContract.Contacts.LOOKUP_KEY, ContactsContract.Contacts.DISPLAY_NAME },
ContactsContract.Data.MIMETYPE + "=? AND " + ContactsContract.CommonDataKinds.StructuredName.FAMILY_NAME + "=?",
new String[] { ContactsContract.CommonDataKinds.StructuredName.CONTENT_ITEM_TYPE, "Smith" }, null);
while (ncursor.moveToNext()) {
print (ncursor.getString(ncursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)) + lineSep);
String lookupKey = ncursor.getString (ncursor.getColumnIndex(ContactsContract.Contacts.LOOKUP_KEY));
Cursor dcursor = null;
try {
dcursor = content.query (ContactsContract.Data.CONTENT_URI,
new String[] { ContactsContract.Data.MIMETYPE, ContactsContract.CommonDataKinds.Phone.NUMBER,
ContactsContract.Data.DATA1 },
ContactsContract.Contacts.LOOKUP_KEY + "=?", new String[] { lookupKey }, null);
while (dcursor.moveToNext()) {
String type = dcursor.getString (ncursor.getColumnIndex(ContactsContract.Data.MIMETYPE));
if (type.equals (ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE))
print ("Phone: " + dcursor.getString(dcursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)) +
lineSep);
else if (type.equals (ContactsContract.CommonDataKinds.Email.CONTENT_ITEM_TYPE))
print ("Email: " + dcursor.getString(dcursor.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA1)) +
lineSep);
}
} finally {
if (dcursor != null)
dcursor.close();
}
}
} finally {
if (ncursor != null)
ncursor.close();
}

10. Xamarin.Mobile Contacts
var book = new AddressBook ();
foreach (Contact c in book.Where (c => c.LastName == "Smith")) {
Console.WriteLine (c.DisplayName);
foreach (Phone p in c.Phones)
Console.WriteLine ("Phone: " + p.Number);
foreach (Email e in c.Emails)
Console.WriteLine ("Email: " + e.Address);
}

11. Geolocation

12. Geolocation
• Geolocator
• Position
Latitude
Longitude
Accuracy
Altitude
Altitude Accuracy
Heading

13. Geolocation
• Geolocator class
• Retrieve current location
• Listen for Location changes
• DesiredAccuracy influences the location technology that is used

14. MediaPicker

15. MediaPicker
• Take Photos and Videos
• Select Photos and Videos
• Programmatic feature detection
MediaPicker.PhotosSupported
MediaPicker.VideosSupported
MediaPicker. IsCameraAvailable

16. MediaPicker Camera
• Specify which camera to use
• Specify video quality
• Async and C# TPL Compatible
Task.ContinueWith, IsCancelled, IsFaulted

17. MediaPicker iOS
var picker = new MediaPicker();
MediaPickerController controller = picker.GetTakePhotoUI (new
StoreCameraMediaOptions {
Name = "test.jpg",
Directory = "MediaPickerSample"
});
PresentViewController (controller, true, null);
controller.GetResultAsync().ContinueWith (t => {
// Dismiss the UI yourself
controller.DismissViewController (true, () => {
MediaFile file = t.Result;
});
}, TaskScheduler.FromCurrentSynchronizationContext());

18. MediaPicker Android
var picker = new MediaPicker (this);
if (!picker.IsCameraAvailable)
Console.WriteLine ("No camera!");
else {
var intent = picker.GetTakePhotoUI (new StoreCameraMediaOptions {
Name = "test.jpg",
Directory = "MediaPickerSample"
});
StartActivityForResult (intent, 1);
}

19. MediaPicker Android
protected override void OnActivityResult (int requestCode, Result resultCode,
Intent data)
{
// User canceled
if (resultCode == Result.Canceled)
return;
data.GetMediaFileExtraAsync (this).ContinueWith (t => {
if (requestCode == 1) { // Video request
ShowVideo (t.Result.Path);
} else if (requestCode == 2) { // Image request
ShowImage (t.Result.Path);
}
}, TaskScheduler.FromCurrentSynchronizationContext());
}

20. var mediaPickerController = mediaPicker.GetPickPhotoUI();
mediaPickerController.GetResultAsync()
.ContinueWith (t => {
mediaPickerController.DismissViewController (
true, () => {
// User canceled or something went wrong
if (t.IsCanceled || t.IsFaulted)
return;
// We get back a MediaFile
MediaFile media = t.Result;
});
}, TaskScheduler.FromCurrentSynchronizationContext());
MediaPicker Selecting Photos

21. Demo

22. Resources
xamarin.com/mobileapi