android 4 new features for application development aydin 2015 03 25 Lập trình android

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Android4:NewfeaturesforApplication
Development
DevelopAndroidapplicationsusingthenewfeaturesof
AndroidIceCreamSandwich
MuratAydin
BIRMINGHAM-MUMBAI

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Android4:NewfeaturesforApplicationDevelopment
Copyright©2012PacktPublishing
Allrightsreserved.Nopartofthisbookmaybereproduced,storedina
retrievalsystem,ortransmittedinanyformorbyanymeans,withouttheprior
writtenpermissionofthepublisher,exceptinthecaseofbriefquotations
embeddedincriticalarticlesorreviews.
Everyefforthasbeenmadeinthepreparationofthisbooktoensurethe
accuracyoftheinformationpresented.However,theinformationcontainedin
thisbookissoldwithoutwarranty,eitherexpressorimplied.Neitherthe
author,norPacktPublishing,anditsdealersanddistributorswillbeheldliable
foranydamagescausedorallegedtobecauseddirectlyorindirectlybythis
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thecompaniesandproductsmentionedinthisbookbytheappropriateuseof
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information.
Firstpublished:December2012
ProductionReference:1171212

PublishedbyPacktPublishingLtd.LiveryPlace
35LiveryStreet
BirminghamB32PB,UK..
www.packtpub.comCoverImagebyAbhishekPandey
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Credits
Author
MuratAydin
ProjectCoordinatorEshaThakker
Reviewers
RickBoyer
AhmetOguzMermerkayaNathanSchwermannMuratYener
ProofreaderMariaGould
Indexer
MonicaAjmeraMehta
AcquisitionEditorUshaIyer
Graphics
AditiGajjar
CommissioningEditorMeetaRajani
MariaD’souza
YogeshDalvi
ProductionCoordinatorPrachaliBhiwandkar
CoverWork
PrachaliBhiwandkar
TechnicalEditorNiteeShetty

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AbouttheAuthor
MuratAydinisaSeniorSoftwareEngineerinacompanythatdevelops
software
technologiesfordefensesystems,andanenthusiasticAndroiddeveloper.He
hasseveralAndroidapplicationsinGooglePlay.HeisaSunCertifiedJava
Developerandhaseightyearsofexperienceindevelopingweb-based
applicationsusingJavatechnologies,desktop,andengineeringapplications
using.NETtechnologies.
HeearnedhisBScdegreeinComputerEngineeringfromMETU(MiddleEast
TechnicalUniversity)andhisMScdegreeinSoftwareEngineeringfrom
METU.
HeisamemberofGDGAnkara(GoogleDeveloperGroupAnkara,
www.gdgankara.org).TheyorganizeseveralAndroideventsinGDGAnkara
suchasAndroidDeveloperDays(www.androiddeveloperdays.com).
HeismarriedandlivesinAnkarawithhiswifeÜlkü.
YoucangetintouchwithhimonLinkedinatmuratayd%C4%B1n/33/702/6a2,orthroughhisTwitterhandle@maydintr,oryoucan
alsoe-mailhimat
IwouldliketothankmypreciouswifeÜlküforabidingwithmeduringmy
longhoursofworkforthisbook.Aspecialthankstomyparentsandmy
siblingsforsupportingme.IwouldalsoliketothankAhmetOğuz
Mermerkaya,MuratYener,RickBoyer,andNathanSchwermannfor
reviewingmybook.Finally,IwanttothanktheteamatPacktPublishingfor
alltheirhelp.

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AbouttheReviewers
RickBoyerhasovertwentyyearsofprofessionalprogramming
experience,
includingdevelopingapplicationsonWindows,WindowsCE,Windows
Phone,andAndroid.Withapassionformobile,henowfocusesexclusivelyon
theAndroidplatformwithhisconsultingbusiness,NightSkyDevelopment.
HealsorunstheLinkedIngroup,PublishedAndroidDevelopers
(wheredevelopersdiscussissuesrelatedtopublishingapps
tothemarket.
Youcancontacthimatabout.me\RickBoyer.
AhmetOguzMermerkayaisanElectronicsEngineerbuthasalways
worked
asasoftwaredeveloper.Hehasdevelopedsoftwaresondifferentplatforms
usingC,C++,Java,UML,andWeb(PHP,MySQL).Healsohasexperiencein
extremeprogrammingtechniquesandmodel-drivendevelopment.Currently,
heisworkingonAndroidapplicationdevelopment.Heistheauthorof
MerhabaAndroid,aturkishbookaboutAndroidapplicationdevelopment.He
isalsoanactivememberoftheGDGcommunityinTurkey.
NathanSchwermannisagraduatefromtheUniversityofKansasandhas
been
developingapplicationsforAndroidprofessionallyforovertwoyears.Heisa
strongsupporterofbackwardcompatibilityandisveryfamiliarwithboth
Google’ssupportlibraryanditsfamousextensionActionbarSherlock.Healso
reviewedAndroid3.0Animations,PacktPublishing.
YoucancontactNathananytimeatifyouwouldliketotalk
aboutAndroid,joboffers,orarrangeameetupatGoogleIOorotherpopular
Androidevents.
MuratYenercompletedhisBSandMSdegreeatIstanbulTechnical
University.
HehastakenpartinseveralprojectsstillinuseattheITUInformatics

Institute.HehasworkedonIsbank’sCoreBankingexchangeprojectasa
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J2EEdeveloper.Hehasdesignedandcompletedseveralprojectsstillonthe
marketbyMuseSystems.HehasworkedinTAVAirportsInformation
TechnologiesasaEnterpriseJava&Flexdeveloper.HehasworkedforHSBC
asaprojectleaderresponsibleforbusinessprocessesandrichclientuser
interfaces.CurrentlyheisemployedatEterationA.S.workingonseveral
projectsincludingEclipseLibraTools,GWT,andMobileapplications(both
onAndroidandiOS).
HeisalsoleadingtheGoogleTechnologyUserGroupIstanbulsince2009and
isaregularspeakeratconferencessuchasJavaOne,EclipseCon,EclipseIst,
andGDGmeetings.
IwouldliketothankMuratAydin,whoofferedmethechancetoreviewhis
wonderfulbook.IwouldalsoliketothankNaciDaiforbeingmymentorand
providingthebestworkenvironment,DanielKurkafordevelopingmgwt,the
bestmobileplatformIeverworkedon,andNilayCoskunforallhersupport.

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TableofContents
Preface1Chapter1:ActionBarforAll7
Actionbar7
Addinganactionbar9
AddinganActionProvider14
AddingsubmenustotheActionProvider19
ShareActionProvider21
Addinganactionview24

Usingtheactionbarfornavigation30
Summary35
Chapter2:ANewLayout–GridLayout37
GridLayout37
WhytouseGridLayout39
AddingaGridLayout39
ConfiguringGridLayout43
Anewview–Space49
Summary51
Chapter3:SocialAPIs53
BasicsofcontactsinAndroid53
UsingSocialAPI54
Deviceuserprofile65
Summary65
Chapter4:CalendarAPIs67
UsingCalendarAPIs67
Creatinganevent68
UsingIntentsforcreatingevents73
Addinganattendee73
Addingareminder74
Summary76
Chapter5:Fragments77

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Fragmentbasics77
Fragmentlifecycle78
Creatingandmanagingfragments79
Programmaticallyaddingafragment85

Eventsharingwithactivity86
Usingmultiplefragmentsinanactivity87
Typesoffragments91
ListFragment91
DialogFragment91
PreferenceFragment96
WebViewFragment99
Summary104
Chapter6:SupportingDifferentScreenSizes105
Android4.0supportsdifferentscreensizes105
Usingmatch_parentandwrap_content107
Usingdipinsteadofpx111
OmitusingAbsoluteLayout113
Providingdifferentbitmapdrawablesfordifferentscreendensities114
Providingdifferentlayoutsfordifferentscreensizes115
Nine-patch117
Summary118
Chapter7:AndroidCompatibilityPackage119
WhatisAndroidCompabilityPackage119
HowtousetheAndroidCompatibilityPackage120
Summary126
Chapter8:NewConnectivityAPIs–AndroidBeamandWi-FiDirect127
AndroidBeam127
BeamingNdefMessages128
Wi-FiDirect133
SampleWi-FiDirectapplication134
Summary143
Chapter9:MultipleAPKSupport
Thischapterisavailablefordownloadat
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Support.pdf.
[ ]
ii

Chapter10:APIswithAndroidJellyBean
Thischapterisavailablefordownloadat
JellyBean.pdf.

Index145
[ ]
iii

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Preface
Thisbookisapracticalandhands-onguidefordevelopingAndroid
applicationsusingnewfeaturesofAndroidIceCreamSandwich(Android
4.0),withastep-by-stepapproachandclearlyexplainedsamplecodes.You
willlearnthenewAPIsinAndroid4.0withthesesamplecodes.

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Whatthisbookcovers

Chapter1,ActionBarforAll,introducesustotheactionbarandshowsus
howtouseandconfiguretheactionbar.
Chapter2,ANewLayout–GridLayout,introducesustoGridLayoutand
showsushowtouseandconfigureGridLayout.GridLayoutisanewlayout
introducedwithAndroidIceCreamSandwich.Thislayoutisanoptimized
layoutandcouldbeusedinsteadofLinearLayoutandRelativeLayout.
Chapter3,SocialAPIs,coverstheSocialAPIsthatwereintroducedwith
AndroidIceCreamSandwich.ThisAPImakesiteasytointegratethesocial
networks.Furthermore,highresolutionphotoscannowbeusedasacontact’s
photoafterIceCreamSandwichwasreleased.ThischaptershowsSocialAPI
usagewithexamples.
Chapter4,CalendarAPIs,coverstheCalendarAPIswhichwereintroduced
withAndroidIceCreamSandwichformanagingcalendars.Event,attendee,
alert,andreminderdatabasescanbemanagedwiththeseAPIs.TheseAPIs
allowustoeasilyintegratecalendarswithourAndroidapplications.This
chaptershowshowtouseCalendarAPIswithexamples.
Chapter5,Fragments,introducesustothebasicsoffragmentsandhowtouse
them.
Chapter6,SupportingDifferentScreenSizes,introducesustothewaysof
designinguserinterfacesthatsupportdifferentscreensizes.
Chapter7,AndroidCompatibilityPackage,introducesustotheAndroid
CompatibilityPackageandshowsushowtouseit.TheAndroidCompatibility
PackageistoallowtheportingofthenewAPIstotheolderversionsofthe
Androidplatform.
Chapter8,NewConnectivityAPIs–AndroidBeamandWi-FiDirect,
introducesustoAndroidBeam,whichusestheNFChardwareofthedevice
andWi-FiDirectwhichallowsdevicestoconnecttoeachotherwithoutusing
wirelessaccesspoints.ThischapterwillteachustheusageofAndroidBeam
andWi-FiDirect.
Chapter9,MultipleAPKSupport,introducesustoMultipleAPKSupport

whichisanewoptioninGooglePlay(AndroidMarket)bywhichmultiple
versionsofAPKscouldbeuploadedforasingleapplication.
Thischapterisavailablefordownloadat

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default/files/downloads/Multiple_APK_Support.pdf.

Chapter10,APIswithAndroidJellyBean,coversAndroidJellyBeanandthe
newAPIswithinit.
Thischapterisavailablefordownloadat />default/files/downloads/Android_JellyBean.pdf.

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Whatyouneedforthisbook
Tofollowtheexamplesinthisbook,theAndroidDevelopmentToolsshould
besetupandready.Thenecessarysoftwarelistisasfollows:
•EclipsewithADTplugin
•AndroidSDKTools
•Androidplatformtools
•ThelatestAndroidplatform
TheOperatingSystemsthatcanbeusedareasfollows:
•WindowsXP(32-bit),Vista(32-or64-bit),orWindows7(32-or64-bit)
•MacOSX10.5.8orlater(x86only)
•Linux(testedonUbuntuLinux,LucidLynx)
°GNUCLibrary(glibc)2.7orlaterisrequired
°OnUbuntuLinux,version8.04orlaterisrequired
°64-bitdistributionsmustbecapableofrunning32-bitapplicationsThe

specificationsforuseoftheEclipseIDEisasfollows:
•Eclipse3.6.2(Helios)orgreater(Eclipse3.5(Galileo)isnolongersupported
withthelatestversionofADT)
•EclipseJDTplugin(includedinmostEclipseIDEpackages)
•JDK6(JREaloneisnotsufficient)
•AndroidDevelopmentToolsplugin(recommended)

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Whothisbookisfor
ThisbookisfordeveloperswhoareexperiencedwiththeAndroidplatform,
butwhomaynotbefamiliarwiththenewfeaturesandAPIsofAndroid4.0.
Androiddeveloperswhowanttolearnaboutsupportingmultiplescreensizes
andmultipleAndroidversions;thisbookisalsoforyou.

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Conventions
Inthisbook,youwillfindanumberofstylesoftextthatdistinguishbetween
differentkindsofinformation.Herearesomeexamplesofthesestyles,andan
explanationoftheirmeaning.
Codewordsintextareshownasfollows:“Implement
onCreateOptionsMenuandonOptionsItemSelectedmethods.”

Ablockofcodeissetasfollows:

<?xmlversion=“1.0”encoding=“utf-8”?>
<menuxmlns:android=“>android:id=”@+id/settings”
android:title=“Settings”>
</item>
<itemandroid:id=”@+id/about”android:title=“About”></item>
</menu>

Whenwewishtodrawyourattentiontoaparticularpartofacodeblock,the
relevantlinesoritemsaresetinbold:
@Override
publicvoidonPrepareSubMenu(SubMenusubMenu){
//Inordertoaddsubmenus,weshouldoverridethismethodwedynamicallycreated
submenus
subMenu.clear();
subMenu.add(“SubItem1”).setOnMenuItemClickListener(this);
subMenu.add(“SubItem2”).setOnMenuItemClickListener(this);
}

Newtermsandimportantwordsareshowninbold.Wordsthatyouseeon
thescreen,inmenusordialogboxesforexample,appearinthetextlikethis:
“ClickontheInsertbuttonandthenclickontheListbutton”.
Warningsorimportantnotesappearinaboxlikethis.Tipsandtricksappearlikethis.

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