Mobile Development 101

Mobile Development 101: Developing Apps for the iPhone and the Android Platforms Michael Galpin, eBay @michaelg

Why Mobile?

Mobile Transactions 30.0 22.5 $M 15.0 7.5 0 Jan 1, 2008 May 1, 2008 Aug 1, 2008 Oct 1, 2008 Dec 1, 2008 Feb 1, 2009 Apr 1, 2009 Jun 1, 2009 Mobile Web iPhone

Usage Capabilities

Usage Capabilities Phones That Matter Distribution Barriers

What Platforms?

iPhone 50% of Mobile Internet Usage Comprehensive Tools High Volume Distribution Channel

Overview • Programming Language: Objective-C • Tools: XCode/Interface Builder, iPhone SDK • Framework: Cocoa Touch • Features: Multi-threaded, Open GL ES, Contacts, Email, WebKit, iTunes, GPS, Google Maps, (Video)Camera, Local Database, Push Notiﬁcations • Pitfalls: Memory management, no background processing, no intra-application communication*, QA, App Store regulations

Objective-C • Derived and compatible with C • C libraries in many cases • Object-oriented • Smalltalk inspired • Surprisingly dynamic

@interface CurrencyAmount : NSObject <NSCoding> { NSDecimalNumber *amount; NSString *currencyID; } @property (nonatomic, retain) NSDecimalNumber *amount; @property (nonatomic, retain) NSString *currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID; - (id) initWithNode:(XMLNode *) node; - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID locale:(NSLocale *) locale; - (id) initWithLocalizedStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithDecimalAmount:(NSDecimalNumber *) inAmount currencyID:(NSString *) inCurrencyID; - (CurrencyAmount *) currencyAmountByMultiplyingByQuantity:(int) inQuantity; - (CurrencyAmount *) currencyAmountByAdding:(CurrencyAmount *) inAmount; -(NSString*) stringValue; -(NSString*) rawDecimalAsString; -(NSString*) formatStringWithoutCurrency; -(NSString*) formatStringShort:(BOOL) shortForm; -(NSString*) currencyPrefixShort:(BOOL) shortForm; - (NSComparisonResult)compare:(CurrencyAmount *)other; - (BOOL) isZeroAmount; @end

interface(header) @interface CurrencyAmount : NSObject <NSCoding> { NSDecimalNumber *amount; NSString *currencyID; } @property (nonatomic, retain) NSDecimalNumber *amount; @property (nonatomic, retain) NSString *currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID; - (id) initWithNode:(XMLNode *) node; - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID locale:(NSLocale *) locale; - (id) initWithLocalizedStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithDecimalAmount:(NSDecimalNumber *) inAmount currencyID:(NSString *) inCurrencyID; - (CurrencyAmount *) currencyAmountByMultiplyingByQuantity:(int) inQuantity; - (CurrencyAmount *) currencyAmountByAdding:(CurrencyAmount *) inAmount; -(NSString*) stringValue; -(NSString*) rawDecimalAsString; -(NSString*) formatStringWithoutCurrency; -(NSString*) formatStringShort:(BOOL) shortForm; -(NSString*) currencyPrefixShort:(BOOL) shortForm; - (NSComparisonResult)compare:(CurrencyAmount *)other; - (BOOL) isZeroAmount; @end

inheritance @interface CurrencyAmount : NSObject <NSCoding> { NSDecimalNumber *amount; NSString *currencyID; } @property (nonatomic, retain) NSDecimalNumber *amount; @property (nonatomic, retain) NSString *currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID; - (id) initWithNode:(XMLNode *) node; - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID locale:(NSLocale *) locale; - (id) initWithLocalizedStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithDecimalAmount:(NSDecimalNumber *) inAmount currencyID:(NSString *) inCurrencyID; - (CurrencyAmount *) currencyAmountByMultiplyingByQuantity:(int) inQuantity; - (CurrencyAmount *) currencyAmountByAdding:(CurrencyAmount *) inAmount; -(NSString*) stringValue; -(NSString*) rawDecimalAsString; -(NSString*) formatStringWithoutCurrency; -(NSString*) formatStringShort:(BOOL) shortForm; -(NSString*) currencyPrefixShort:(BOOL) shortForm; - (NSComparisonResult)compare:(CurrencyAmount *)other; - (BOOL) isZeroAmount; @end

protocol @interface CurrencyAmount : NSObject <NSCoding> { NSDecimalNumber *amount; NSString *currencyID; } @property (nonatomic, retain) NSDecimalNumber *amount; @property (nonatomic, retain) NSString *currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID; - (id) initWithNode:(XMLNode *) node; - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID locale:(NSLocale *) locale; - (id) initWithLocalizedStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithDecimalAmount:(NSDecimalNumber *) inAmount currencyID:(NSString *) inCurrencyID; - (CurrencyAmount *) currencyAmountByMultiplyingByQuantity:(int) inQuantity; - (CurrencyAmount *) currencyAmountByAdding:(CurrencyAmount *) inAmount; -(NSString*) stringValue; -(NSString*) rawDecimalAsString; -(NSString*) formatStringWithoutCurrency; -(NSString*) formatStringShort:(BOOL) shortForm; -(NSString*) currencyPrefixShort:(BOOL) shortForm; - (NSComparisonResult)compare:(CurrencyAmount *)other; - (BOOL) isZeroAmount; @end

@interface CurrencyAmount : NSObject <NSCoding> { NSDecimalNumber *amount; NSString *currencyID; instance variable } @property (nonatomic, retain) NSDecimalNumber *amount; @property (nonatomic, retain) NSString *currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID; - (id) initWithNode:(XMLNode *) node; - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID locale:(NSLocale *) locale; - (id) initWithLocalizedStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithDecimalAmount:(NSDecimalNumber *) inAmount currencyID:(NSString *) inCurrencyID; - (CurrencyAmount *) currencyAmountByMultiplyingByQuantity:(int) inQuantity; - (CurrencyAmount *) currencyAmountByAdding:(CurrencyAmount *) inAmount; -(NSString*) stringValue; -(NSString*) rawDecimalAsString; -(NSString*) formatStringWithoutCurrency; -(NSString*) formatStringShort:(BOOL) shortForm; -(NSString*) currencyPrefixShort:(BOOL) shortForm; - (NSComparisonResult)compare:(CurrencyAmount *)other; - (BOOL) isZeroAmount; @end

@interface CurrencyAmount : NSObject <NSCoding> { NSDecimalNumber *amount; NSString *currencyID; } method declarations @property (nonatomic, retain) NSDecimalNumber *amount; @property (nonatomic, retain) NSString *currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID; - (id) initWithNode:(XMLNode *) node; - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID locale:(NSLocale *) locale; - (id) initWithLocalizedStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithDecimalAmount:(NSDecimalNumber *) inAmount currencyID:(NSString *) inCurrencyID; - (CurrencyAmount *) currencyAmountByMultiplyingByQuantity:(int) inQuantity; - (CurrencyAmount *) currencyAmountByAdding:(CurrencyAmount *) inAmount; -(NSString*) stringValue; -(NSString*) rawDecimalAsString; -(NSString*) formatStringWithoutCurrency; -(NSString*) formatStringShort:(BOOL) shortForm; -(NSString*) currencyPrefixShort:(BOOL) shortForm; - (NSComparisonResult)compare:(CurrencyAmount *)other; - (BOOL) isZeroAmount; @end

@interface CurrencyAmount : NSObject <NSCoding> { NSDecimalNumber *amount; NSString *currencyID; } @property (nonatomic, retain) NSDecimalNumber *amount; @property (nonatomic, retain) NSString *currencyID; property + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID; - (id) initWithNode:(XMLNode *) node; - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID locale:(NSLocale *) locale; - (id) initWithLocalizedStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithDecimalAmount:(NSDecimalNumber *) inAmount currencyID:(NSString *) inCurrencyID; - (CurrencyAmount *) currencyAmountByMultiplyingByQuantity:(int) inQuantity; - (CurrencyAmount *) currencyAmountByAdding:(CurrencyAmount *) inAmount; -(NSString*) stringValue; -(NSString*) rawDecimalAsString; -(NSString*) formatStringWithoutCurrency; -(NSString*) formatStringShort:(BOOL) shortForm; -(NSString*) currencyPrefixShort:(BOOL) shortForm; - (NSComparisonResult)compare:(CurrencyAmount *)other; - (BOOL) isZeroAmount; @end

@interface CurrencyAmount : NSObject <NSCoding> { NSDecimalNumber *amount; NSString *currencyID; } @property (nonatomic, retain) NSDecimalNumber *amount; @property (nonatomic, retain) NSString *currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID; - (id) initWithNode:(XMLNode *) node; class/static method - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID locale:(NSLocale *) locale; - (id) initWithLocalizedStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithDecimalAmount:(NSDecimalNumber *) inAmount currencyID:(NSString *) inCurrencyID; - (CurrencyAmount *) currencyAmountByMultiplyingByQuantity:(int) inQuantity; - (CurrencyAmount *) currencyAmountByAdding:(CurrencyAmount *) inAmount; -(NSString*) stringValue; -(NSString*) rawDecimalAsString; -(NSString*) formatStringWithoutCurrency; -(NSString*) formatStringShort:(BOOL) shortForm; -(NSString*) currencyPrefixShort:(BOOL) shortForm; - (NSComparisonResult)compare:(CurrencyAmount *)other; - (BOOL) isZeroAmount; @end

@interface CurrencyAmount : NSObject <NSCoding> { NSDecimalNumber *amount; NSString *currencyID; } @property (nonatomic, retain) NSDecimalNumber *amount; @property (nonatomic, retain) NSString *currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID; input parameter - (id) initWithNode:(XMLNode *) node; - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID locale:(NSLocale *) locale; - (id) initWithLocalizedStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithDecimalAmount:(NSDecimalNumber *) inAmount currencyID:(NSString *) inCurrencyID; - (CurrencyAmount *) currencyAmountByMultiplyingByQuantity:(int) inQuantity; - (CurrencyAmount *) currencyAmountByAdding:(CurrencyAmount *) inAmount; -(NSString*) stringValue; -(NSString*) rawDecimalAsString; -(NSString*) formatStringWithoutCurrency; -(NSString*) formatStringShort:(BOOL) shortForm; -(NSString*) currencyPrefixShort:(BOOL) shortForm; - (NSComparisonResult)compare:(CurrencyAmount *)other; - (BOOL) isZeroAmount; @end

@interface CurrencyAmount : NSObject <NSCoding> { NSDecimalNumber *amount; NSString *currencyID; } @property (nonatomic, retain) NSDecimalNumber *amount; return type @property (nonatomic, retain) NSString *currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID; - (id) initWithNode:(XMLNode *) node; - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID locale:(NSLocale *) locale; - (id) initWithLocalizedStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithDecimalAmount:(NSDecimalNumber *) inAmount currencyID:(NSString *) inCurrencyID; - (CurrencyAmount *) currencyAmountByMultiplyingByQuantity:(int) inQuantity; - (CurrencyAmount *) currencyAmountByAdding:(CurrencyAmount *) inAmount; -(NSString*) stringValue; -(NSString*) rawDecimalAsString; -(NSString*) formatStringWithoutCurrency; -(NSString*) formatStringShort:(BOOL) shortForm; -(NSString*) currencyPrefixShort:(BOOL) shortForm; - (NSComparisonResult)compare:(CurrencyAmount *)other; - (BOOL) isZeroAmount; @end

@interface CurrencyAmount : NSObject <NSCoding> { NSDecimalNumber *amount; NSString *currencyID; } @property (nonatomic, retain) NSDecimalNumber *amount; method name @property (nonatomic, retain) NSString *currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID; - (id) initWithNode:(XMLNode *) node; - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID locale:(NSLocale *) locale; - (id) initWithLocalizedStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithDecimalAmount:(NSDecimalNumber *) inAmount currencyID:(NSString *) inCurrencyID; - (CurrencyAmount *) currencyAmountByMultiplyingByQuantity:(int) inQuantity; - (CurrencyAmount *) currencyAmountByAdding:(CurrencyAmount *) inAmount; -(NSString*) stringValue; -(NSString*) rawDecimalAsString; -(NSString*) formatStringWithoutCurrency; -(NSString*) formatStringShort:(BOOL) shortForm; -(NSString*) currencyPrefixShort:(BOOL) shortForm; - (NSComparisonResult)compare:(CurrencyAmount *)other; - (BOOL) isZeroAmount; @end

@interface CurrencyAmount : NSObject <NSCoding> { NSDecimalNumber *amount; NSString *currencyID; } @property (nonatomic, retain) NSDecimalNumber *amount; @property (nonatomic, retain) NSString *currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID; - (id) initWithNode:(XMLNode *) node; instance method - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID locale:(NSLocale *) locale; - (id) initWithLocalizedStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithDecimalAmount:(NSDecimalNumber *) inAmount currencyID:(NSString *) inCurrencyID; - (CurrencyAmount *) currencyAmountByMultiplyingByQuantity:(int) inQuantity; - (CurrencyAmount *) currencyAmountByAdding:(CurrencyAmount *) inAmount; -(NSString*) stringValue; -(NSString*) rawDecimalAsString; -(NSString*) formatStringWithoutCurrency; -(NSString*) formatStringShort:(BOOL) shortForm; -(NSString*) currencyPrefixShort:(BOOL) shortForm; - (NSComparisonResult)compare:(CurrencyAmount *)other; - (BOOL) isZeroAmount; @end

@interface CurrencyAmount : NSObject <NSCoding> { NSDecimalNumber *amount; NSString *currencyID; } @property (nonatomic, retain) NSDecimalNumber *amount; @property (nonatomic, retain) NSString *currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID; - (id) initWithNode:(XMLNode *) node; 1st param - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID locale:(NSLocale *) locale; - (id) initWithLocalizedStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithDecimalAmount:(NSDecimalNumber *) inAmount currencyID:(NSString *) inCurrencyID; - (CurrencyAmount *) currencyAmountByMultiplyingByQuantity:(int) inQuantity; - (CurrencyAmount *) currencyAmountByAdding:(CurrencyAmount *) inAmount; -(NSString*) stringValue; -(NSString*) rawDecimalAsString; -(NSString*) formatStringWithoutCurrency; -(NSString*) formatStringShort:(BOOL) shortForm; -(NSString*) currencyPrefixShort:(BOOL) shortForm; - (NSComparisonResult)compare:(CurrencyAmount *)other; - (BOOL) isZeroAmount; @end

@interface CurrencyAmount : NSObject <NSCoding> { NSDecimalNumber *amount; NSString *currencyID; } @property (nonatomic, retain) NSDecimalNumber *amount; @property (nonatomic, retain) NSString *currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID; - (id) initWithNode:(XMLNode *) node; 2nd param - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID locale:(NSLocale *) locale; - (id) initWithLocalizedStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithDecimalAmount:(NSDecimalNumber *) inAmount currencyID:(NSString *) inCurrencyID; - (CurrencyAmount *) currencyAmountByMultiplyingByQuantity:(int) inQuantity; - (CurrencyAmount *) currencyAmountByAdding:(CurrencyAmount *) inAmount; -(NSString*) stringValue; -(NSString*) rawDecimalAsString; -(NSString*) formatStringWithoutCurrency; -(NSString*) formatStringShort:(BOOL) shortForm; -(NSString*) currencyPrefixShort:(BOOL) shortForm; - (NSComparisonResult)compare:(CurrencyAmount *)other; - (BOOL) isZeroAmount; @end

@interface CurrencyAmount : NSObject <NSCoding> { NSDecimalNumber *amount; NSString *currencyID; } @property (nonatomic, retain) NSDecimalNumber *amount; @property (nonatomic, retain) NSString *currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID; - (id) initWithNode:(XMLNode *) node; 3rd param - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID locale:(NSLocale *) locale; - (id) initWithLocalizedStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithDecimalAmount:(NSDecimalNumber *) inAmount currencyID:(NSString *) inCurrencyID; - (CurrencyAmount *) currencyAmountByMultiplyingByQuantity:(int) inQuantity; - (CurrencyAmount *) currencyAmountByAdding:(CurrencyAmount *) inAmount; -(NSString*) stringValue; -(NSString*) rawDecimalAsString; -(NSString*) formatStringWithoutCurrency; -(NSString*) formatStringShort:(BOOL) shortForm; -(NSString*) currencyPrefixShort:(BOOL) shortForm; - (NSComparisonResult)compare:(CurrencyAmount *)other; - (BOOL) isZeroAmount; @end

@interface CurrencyAmount : NSObject <NSCoding> { NSDecimalNumber *amount; NSString *currencyID; } @property (nonatomic, retain) NSDecimalNumber *amount; @property (nonatomic, retain) NSString *currencyID; method name + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID; - (id) initWithNode:(XMLNode *) node; - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID locale:(NSLocale *) locale; - (id) initWithLocalizedStringAmount:(NSString *) inAmount currencyID:(NSString *) inCurrencyID; - (id) initWithDecimalAmount:(NSDecimalNumber *) inAmount currencyID:(NSString *) inCurrencyID; - (CurrencyAmount *) currencyAmountByMultiplyingByQuantity:(int) inQuantity; - (CurrencyAmount *) currencyAmountByAdding:(CurrencyAmount *) inAmount; -(NSString*) stringValue; -(NSString*) rawDecimalAsString; -(NSString*) formatStringWithoutCurrency; -(NSString*) formatStringShort:(BOOL) shortForm; -(NSString*) currencyPrefixShort:(BOOL) shortForm; - (NSComparisonResult)compare:(CurrencyAmount *)other; - (BOOL) isZeroAmount; @end

@implementation CurrencyAmount @synthesize amount; @synthesize currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID { return [[[CurrencyAmount alloc] initWithDoubleAmount:0.0 currencyID:inCurrencyID] autorelease]; } - (id) initWithNode:(XMLNode *) node { NSString *inCurrencyID = [node attributeValue:@"currencyID"]; [self initWithStringAmount:[node getText] currencyID:inCurrencyID]; return self; } - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID { amount = [[NSDecimalNumber alloc] initWithDouble:inAmount]; self.currencyID = inCurrencyID; return self; } - (BOOL) isZeroAmount { return [amount compare:[NSDecimalNumber zero]] == NSOrderedSame; } - (void) dealloc { [amount release]; [currencyID release]; [super dealloc]; } @end

@implementation CurrencyAmount implementation of interface @synthesize amount; @synthesize currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID { return [[[CurrencyAmount alloc] initWithDoubleAmount:0.0 currencyID:inCurrencyID] autorelease]; } - (id) initWithNode:(XMLNode *) node { NSString *inCurrencyID = [node attributeValue:@"currencyID"]; [self initWithStringAmount:[node getText] currencyID:inCurrencyID]; return self; } - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID { amount = [[NSDecimalNumber alloc] initWithDouble:inAmount]; self.currencyID = inCurrencyID; return self; } - (BOOL) isZeroAmount { return [amount compare:[NSDecimalNumber zero]] == NSOrderedSame; } - (void) dealloc { [amount release]; [currencyID release]; [super dealloc]; } @end

@implementation CurrencyAmount @synthesize amount; macro getter/setter @synthesize currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID { return [[[CurrencyAmount alloc] initWithDoubleAmount:0.0 currencyID:inCurrencyID] autorelease]; } - (id) initWithNode:(XMLNode *) node { NSString *inCurrencyID = [node attributeValue:@"currencyID"]; [self initWithStringAmount:[node getText] currencyID:inCurrencyID]; return self; } - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID { amount = [[NSDecimalNumber alloc] initWithDouble:inAmount]; self.currencyID = inCurrencyID; return self; } - (BOOL) isZeroAmount { return [amount compare:[NSDecimalNumber zero]] == NSOrderedSame; } - (void) dealloc { [amount release]; [currencyID release]; [super dealloc]; } @end

@implementation CurrencyAmount @synthesize amount; @synthesize currencyID; method implementations + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID { return [[[CurrencyAmount alloc] initWithDoubleAmount:0.0 currencyID:inCurrencyID] autorelease]; } - (id) initWithNode:(XMLNode *) node { NSString *inCurrencyID = [node attributeValue:@"currencyID"]; [self initWithStringAmount:[node getText] currencyID:inCurrencyID]; return self; } - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID { amount = [[NSDecimalNumber alloc] initWithDouble:inAmount]; self.currencyID = inCurrencyID; return self; } - (BOOL) isZeroAmount { return [amount compare:[NSDecimalNumber zero]] == NSOrderedSame; } - (void) dealloc { [amount release]; [currencyID release]; [super dealloc]; } @end

@implementation CurrencyAmount @synthesize amount; @synthesize currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID { return [[[CurrencyAmount alloc] initWithDoubleAmount:0.0 currencyID:inCurrencyID] autorelease]; } method invocation - (id) initWithNode:(XMLNode *) node { NSString *inCurrencyID = [node attributeValue:@"currencyID"]; [self initWithStringAmount:[node getText] currencyID:inCurrencyID]; return self; } - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID { amount = [[NSDecimalNumber alloc] initWithDouble:inAmount]; self.currencyID = inCurrencyID; return self; } - (BOOL) isZeroAmount { return [amount compare:[NSDecimalNumber zero]] == NSOrderedSame; } - (void) dealloc { [amount release]; [currencyID release]; [super dealloc]; } @end

@implementation CurrencyAmount @synthesize amount; @synthesize currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID { return [[[CurrencyAmount alloc] initWithDoubleAmount:0.0 currencyID:inCurrencyID] autorelease]; } - (id) initWithNode:(XMLNode *) node { NSString *inCurrencyID = [node attributeValue:@"currencyID"];string literal [self initWithStringAmount:[node getText] currencyID:inCurrencyID]; return self; } - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID { amount = [[NSDecimalNumber alloc] initWithDouble:inAmount]; self.currencyID = inCurrencyID; return self; } - (BOOL) isZeroAmount { return [amount compare:[NSDecimalNumber zero]] == NSOrderedSame; } - (void) dealloc { [amount release]; [currencyID release]; [super dealloc]; } @end

@implementation CurrencyAmount @synthesize amount; @synthesize currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID { return [[[CurrencyAmount alloc] initWithDoubleAmount:0.0 currencyID:inCurrencyID] autorelease]; } - (id) initWithNode:(XMLNode *) node { NSString *inCurrencyID = [node attributeValue:@"currencyID"]; [self initWithStringAmount:[node getText] currencyID:inCurrencyID]; return self; } nested call - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID { amount = [[NSDecimalNumber alloc] initWithDouble:inAmount]; self.currencyID = inCurrencyID; return self; } - (BOOL) isZeroAmount { return [amount compare:[NSDecimalNumber zero]] == NSOrderedSame; } - (void) dealloc { [amount release]; [currencyID release]; [super dealloc]; } @end

@implementation CurrencyAmount @synthesize amount; @synthesize currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID { return [[[CurrencyAmount alloc] initWithDoubleAmount:0.0 currencyID:inCurrencyID] autorelease]; } - (id) initWithNode:(XMLNode *) node { NSString *inCurrencyID = [node attributeValue:@"currencyID"]; [self initWithStringAmount:[node getText] currencyID:inCurrencyID]; this instance return self; } - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID { amount = [[NSDecimalNumber alloc] initWithDouble:inAmount]; self.currencyID = inCurrencyID; return self; } - (BOOL) isZeroAmount { return [amount compare:[NSDecimalNumber zero]] == NSOrderedSame; } - (void) dealloc { [amount release]; [currencyID release]; [super dealloc]; } @end

@implementation CurrencyAmount @synthesize amount; @synthesize currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID { return [[[CurrencyAmount alloc] initWithDoubleAmount:0.0 currencyID:inCurrencyID] autorelease]; } - (id) initWithNode:(XMLNode *) node { NSString *inCurrencyID = [node attributeValue:@"currencyID"]; [self initWithStringAmount:[node getText] currencyID:inCurrencyID]; return self; } - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID { amount = [[NSDecimalNumber alloc] initWithDouble:inAmount]; self.currencyID = inCurrencyID; return self; } - (BOOL) isZeroAmount { return [amount compare:[NSDecimalNumber zero]] == NSOrderedSame; } - (void) dealloc { override superclass [amount release]; [currencyID release]; [super dealloc]; } @end

@implementation CurrencyAmount @synthesize amount; @synthesize currencyID; + (CurrencyAmount *) zeroAmountWithCurrencyID:(NSString *) inCurrencyID { return [[[CurrencyAmount alloc] initWithDoubleAmount:0.0 currencyID:inCurrencyID] autorelease]; } - (id) initWithNode:(XMLNode *) node { NSString *inCurrencyID = [node attributeValue:@"currencyID"]; [self initWithStringAmount:[node getText] currencyID:inCurrencyID]; return self; } - (id) initWithDoubleAmount:(double) inAmount currencyID:(NSString *) inCurrencyID { amount = [[NSDecimalNumber alloc] initWithDouble:inAmount]; self.currencyID = inCurrencyID; return self; } - (BOOL) isZeroAmount { return [amount compare:[NSDecimalNumber zero]] == NSOrderedSame; } - (void) dealloc { memory mangement [amount release]; [currencyID release]; [super dealloc]; } @end

XCode • Full featured IDE • Build, debug • Code navigation, completion • Refactoring • SCM Integration • Wizards

Interface Builder • Drag-and-drop, UI Design Tool • Integrated with XCode • Connect code to UI elements (events)

Instruments • Proﬁling Tool • Memory Usage • Leaks • CPU Usage • Threads, I/O Monitoring

iPhone Emulator Runs application natively Not all APIs available Some APIs mocked: Location

Cocoa Touch • MVC Framework • AppKit • Controls, Events • UIKit • Accelerometer, Multi-touch

Dangers

Garbage

Don’t Call Me... Push Notiﬁcations = Substitute for Background Processing?

App 2 App No formal intra-application communication allowed Custom URL protocols used as hack

QA? Manual provisioning: 100 iPhone

Android • Devices, devices, devices • Open Source: OS, SDK • Language: Java+ • Features: Multi-threaded, Open GL ES, Contacts, Email, WebKit, Media, GPS, Google Maps, (Video)Camera, Local Database, Background Service, Garbage Collection, Intents • Pitfalls: Memory Management, Assault on Battery, Devices, Devices, Devices...

Compiler Dex Compiler Compress Source Code Class ﬁles Dex File APK

Android Runtime & App Framework • Activities & Intents • Separation of Concerns • Launch an Activity based on an • Layout Intent • Application Logic • Application Interop • XML => Bytecode • Layout • Localization

The Web Services Diet Web Services: Made for Servers, not Phones Data Centric vs. Functional Centric Mo’ Data, Mo’ Problems XML = Teh Suck

Try Not to Drown •Images, Audio, Video •Browser features taken for granted •Caching / Cache Management •Simultaneous Loading

Security • What to store on device? • What about stolen devices? • Jailbreaking? • Phishing? • OAuth??? • Hard coding == FAIL

Upgrades? What Upgrades? • Far from automatic • Out of sight, out of mind • Don’t expect upgrades • Lots of versions to manage • Agile Development FTW???

eb le W b i Mo

Mobile Web a.k.a. HTML 5 • One app to rule them all: iPhone, Android, webOS, Blackberry* • Language: JavaScript, HTML, CSS • Tools: ... • Features: Multi-threaded!, Open GL ES, Contacts, Email, GPS, Maps, (Video)Camera, Local Database, Media, Memory Management, Security • Pitfalls: Memory management, no background processing, WebKit versioning

Resources

• iPhone Developer Center • Silicon Valley iPhone Developers • Stack Overﬂow • MOTODEV • Android Developers • Silicon Valley Android Developers • Android Developers Group

Sprint Developer Conference • October 26-28 • Santa Clara Convention Center • Android, Mobile Web, webOS, RIM, J2ME, WinMo • Coding Camps • Free HTC Hero (Android) • 4G Demo and Beta

Mobile Development 101

by Michael Galpin

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Mobile Development 101 Presentation Transcript

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