Key concepts of android app development
- 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.