An associatedroid app is associate golem Application. associate app is prepackaged in associate APK file i.e. golem application package. The APK file contains the compiled

1. Key Concepts of Android App Development
ndroidisassociate opensupplymobile platformlaunchedbyGoogle in2008 and ever-sinceit
became the favorite forindividualsanddevelopersroundthe world.golemisUNIXsystembased
mostlymultiprocess andmultithreadedOS.Google'sgolemOSisn'trestrictedtophoneshowever
you'll use itto make a DVR, a hand-heldGPS,associate MP3playeretc.
Althoughgolemplatformisassociate opensupplyandcustomizable,golemusersanddevelopers
became habitual tothe constructsdevelopedbyGoogle forgolemdevices.the utilizationof those
golemideasissignificantfordevelopingassociateapplicationquickly.
Keyideasof golemare:-
Appsand APKFiles
Activities
Fragments
ViewsandViewGroups
Layout XML Files
Intents
Widgets
Services
Sensors
I am providingyouwithanoutline of the golemkeyideas.once havingabasicunderstandingof
Android'skeyideasyou'll godeeperintothe assortedtotallydifferenttopicsand herlatestblog.
Appsand APKFiles
An associatedroidappisassociate golemApplication.associateappisprepackagedinassociate APK
file i.e.golemapplicationpackage.The APKfilecontainsthe compiledJavacode anddifferent
resources like picturesandtextsforthe golemapplication

2. Activities
An associatedroidactivitycouldbe agraphical userinterface part.you'll comprehenditasa window
inan exceedinglydesktopapplication.Astransportablescreensartiny,associate activitytakesup
the entire screen.If youopenmultiple activitiesthenthey're stackedonprime of everydifferent.
willnot|youcan't|youcannot}prepare activitiesfacetbyfacetsuchas youcan do withdesktop
windows.
Activitiesardistinctive,targeted actionsthatauserwill take.because itistoughto scroll,
concentrate or clicklinksonalittle screenthenceit'ssuggestedthatassociate appshow justone
activityperscreen.thiscan giftthe foremostrelevantinfotothe userandpermitsthemto launcha
brand newscreenforaddedinfoorclickthe rear buttonto lookat the previousactivity.The screen
will exposemultipletaskshoweveritoughttofacilitate the usercompleteonly1activityata time.
Fragments
In Android,afractioncouldbe a fragmentof a complete program.afractionsolelytakesupa part of
the screen.Fragmentsar employedinthe activities.Fragmentsalsocanbe usedamongtotally
differentactivities.FragmentscontainViewsandViewGroupswithinthem.
ViewandreadGroups
Androidgraphical userinterface componentsinherit3classesi.e.Activities,ViewsandViewGroups.
Activitiesarthe windows/screens.Viewsarthe individual graphical userinterface components,sort
of a TextViewthatdisplaysatext,aButtonthat userswill clickonetc.ViewGroupsarcontainersfor
Views.A ViewGroupreallyteamsagroupof Viewsalong.ViewsassociatedViewGroupswill be
nestedwithinassociateactivityorwithinevenafractionthatisnestedwithinanactivity.
Layout XML Files
Activities,fragmentsandViewGroupswilluse XMLfilestooutline theirlayoutandcontents.The
layoutXML filestell thatgraphical userinterface partsassociate activityorfragmentcontainsand
additionallythe stylingof the graphical userinterface partsi.e.The size,margins,cushioningetc.

3. Intent
If your app needsplayingaoperate onthe far side itscore capabilitieslike gapaphotograph,taking
part ina videoortryingup a contact thenyou mustdetermine whetherornota tool whichwill
performthatoperate alreadyexistswithinthe OSorin an exceedinglythird-partyapp.If affirmative
thenyou'll getthe goodthingabout that practicalityvictimisationintents.
For e.g.If your app accessesusercontactsthenyou'll use intentobjectstolaunchthe device's
existingContactsapplication.Thisremovesthe programmingduplicationandadditionallyspeedup
the user'sinteractionwiththe device becausethe userwon'toughttolearnonce more a way toadd
a contact to your app.
Widgets
AndroidWidgetsare literallygraphical userinterface partswhichmaybe displayedoutside of
associate activity.Fore.g.A weatherconvenience thatshowstoday'sweatherisshownonseveral
golemhome screens.Widgets are prepackagedassociatedenforcedasa part of an golem
application.additionallytypicallyViewsingolemalsoare statedaswidgets.Fore.g.several graphical
userinterface partsar placedinan exceedinglyJavapackage referredtoasgolem.widget.graphical
userinterface partsaren'tsame as a conveniencewhichmaystayonthe house screenof associate
golemdevice.thenceyoumustperceivethe distinctionbetweengraphical userinterfacepartswhich
may be usedwithinViewGroups,Fragmentsandpartswhichmaybe usedwithinViewGroups,
FragmentsandActivitiesandadditionallywithinWidgetsandWidgetswhichmaystayonthe house
screenof the golemdevice.
Services
In Android,Servicesarbackgroundmethodwhichmaybe deadon associate golemdevice thoughno
applicationisvisible.Servicesdon'tneedaprogram.For e.g.A Service will checkaforeignserverfor
updatesor backupknowledgeeachhour.
Sensors

4. Androiddeviceshave several constitutionalsensorsthatyou'll accessfromyourgolemapplications.
For e.gthe constitutional GPSinsmartphonescouldbe adevice.soyou'll getaccessto the GPS from
withinyourgolemapplications.