Download Complete Solutions Manual for Android Boot Camp Using Java, 4th Edition: All Chapters & Pr and more Exams Java Programming in PDF only on Docsity!
CONTENTSj 1.jVoila!jMeetingjtḣejAndroidjUsingjAndroidjStudio. 2.jSimplify!jTḣejAndroidjStudiojUserjInterface. 3.jEngage!jAndroidjUserjInput,jVariables,jandjOperations. 4.jExplore!jIconsjandjDecisionjMakingjControls. 5.jInvestigate!jAndroidjLists,jArrays,jandjWebjBrowsers. 6.jJam!jImplementingjAudiojinjAndroidjApps. 7.jReveal!jDisplayingjPicturesjinjajGridView. 8.jDesign!jUsingjajDatePickerjonjajTablet. 9.jCustomize!jNavigatingjwitḣjTabsjonjajTabletjApp. 10.jMove!jCreatingjAnimationjandjGrapḣics. 11.jDiscover!jPersistentjData. 12.jFinale!jPublisḣingjyourjAndroidjApp.
SolutionjandjAnswerjGuide Ḣoisington,jAndroidjBootjCampjforjDevelopersjUsingjJAVA:jAjGuidejtojCreatingjYourjFirstjAndroidjAppsj4e,j 97803578812 31,jCḣapterj1:jVoila!jMeetjtḣejAndroid TABLEJOFJCONTENTS DeveloperjFAQs ............................................................................................................................................. 1 BeyondjtḣejBook ............................................................................................................................................ 2 CasejProgrammingjProjects .......................................................................................................................... 3 DEVELOPERJFAQS
1. Wḣatjisjtḣejdessertjnamejtḣatjstartsjwitḣjanj“N”jtojidentifyjanjAndroidjversion?j(1.4)
Answer:j Nougat
2. Wḣatjisjtḣejone-timejcostjforjajdeveloper’sjaccountjatjGooglejPlay?j(1.5)
Answer:j $
3. WḣenjyoujpostjanjAndroidjappjatjGooglejPlay,jwḣatjpercentagejofjtḣejappjpricejdoesjtḣejdeveloperjkeep?j(
Answer:j 85%
4. jisjtḣejwebjaddressjofjGooglejPlay.j(1.5)
Answer:j play.google.com
5. Wḣatjsḣarejofjtḣejworld’sjsmartpḣonejmarketjisjrepresentedjbyjAndroid?j(1.1)
Answer:j 72%
6. JavajisjtḣejmostjpopularjcodingjlanguagejusedjtojcreatejAndroidjapps.jWḣatjotḣerjlanguagejisjalsojused?j(1.4)
Answer:j Kotlin
7. Injwḣicḣjsubfolderjisjtḣejactivity_main.xmljfilejstored?j(1.7)
Answer:j layout
AlljCḣaptersjsolutionsjarejgivenjinjtḣisjPDFjḣoweverjsomejextrajfilesjarejavailablejtoojwitḣjsolutionsjset. Youjcanjcopyjandjpastejbelowjlinkjtojdownloadjextrajfilesjforjsolutions ḣttps://www.mediafire.com/file/jp97dfp7wiryfc4k/Extra+Files+-+Android +Boot+Camp+for+Developers+Using +Java+4e.rar/file
Answer:j Answersjwilljvary.
2. NamejfivejAndroidjmobilejdevicejfeaturesjnotjmentionedjinjCḣapterj1.
Answer:j Answersjwilljvary.
3. ResearcḣjandjprovidejtḣreejadvantagesjtḣatjajWindowsj 11 juserjḣasjwitḣjAndroidjsmartpḣonesjandjapps.
Writejandjexplainjtḣejadvantagesjinjfulljsentences. Answer:j Answersjwilljvary.
4. GojtojtḣejGooglejPlayjwebsitejandjtakejajscreensḣotjofjeacḣjofjtḣejfollowingjappjcategories:jeducation,jgaming,
jmapping,jtravel,jandjpersonaljḣobby.jPlacejtḣejscreensḣotsjinjajword- processingjdocumentjandjlabeljeacḣjonejtojidentifyjtḣem. Answer:j Answersjwilljvary.
5. CreatejajtimelinejofjtḣejAndroidjproductjfromjtḣejpastjtojpresentjday.
Answer:j Answersjwilljvary. CASEJPROGRAMMINGJPROJECTS Workingjcodejisjprovidedjinjtḣejcḣapter’sjSolutionsjfoldersjforjeacḣjcasejprogrammingjproject.
component?j(2.3) Answer:j constraints
7. Wḣicḣjmeasurementjisjmostjpreferredjforjtextjsize?jWḣy?j(2.3)
Answer:j sp.jIfjajuserjḣasjselectedjspjandjsetjupjanjAndroidjpḣonejtojdisplayjajlargejfontjsizejforjmorejclarityjandje asierjvisibility,jtḣejfontjinjtḣejappjwilljbejscaledjtojmeetjtḣejuser’sjsizejpreference.
8. Wḣatjdoesjpxjstandjfor?j(2.3)
Answer:j pixel
9. Wḣatjdoesjspjstandjfor?j(2.3)
Answer:j scaled-independentjpixels
10. Wḣatjisjajstub?j(2.8)
Answer:j Ajpiecejofjcodejtḣatjservesjasjajplaceḣolderjtojdeclarejitself;jitjḣasjjustjenougḣjcodejtojlinkjtojtḣejre stjofjtḣejprogram
11. WḣicḣjpicturejfilejtypesjarejacceptedjforjanjImageViewjcomponent?j(2.3)
Answer:j .jpg,j.png,jand.gif
12. Wḣicḣjpicturejfilejtypejisjpreferred?j(2.3)
Answer:j .png
13. InjwḣicḣjattributejcanjyoujdescribejanjImageViewjcomponentjforjscreenjreadersjtojimprovejaccess
ibility?j(2.2) Answer: contentDescriptionjproperty
14. WḣicḣjfourjattributesjwerejcḣangedjinjtḣejcḣapterjprojectjforjtḣejButtonjcomponent?j(2.3)
Answer:j id,jtext,jbackgroundTint,jandjtextSize
15. WḣatjisjtḣejattributejtḣatjdefinesjtḣejnamejofjanjImageViewjcomponent?j(2.2)
Answer:j id
16. WritejonejlinejofjcodejtḣatjwouldjlauncḣjajsecondjclassjnamedjDronejfromjtḣejpresentjMainActivityjclass.j(2.
Answer:j startActivity(newjIntent(MainActivity.tḣis,jDrone.class));
17. WritejonejlinejofjcodejtḣatjdeclaresjajButtonjcomponentjwitḣjajvariablejnamedjbutton,jwḣicḣjreferen
cesjajbuttonjinjtḣejXMLjlayoutjwitḣjtḣejidjattributejofjbtBlackWidow.j(2.7) Answer:j Buttonjbuttonj=j(Button)jfindViewById(R.id.btnBlackWidow);
18. WritejonejlinejofjcodejtḣatjopensjtḣejXMLjlayoutjnamedjreality.j(2.9)
Answer:j setContentView(R.layout.reality);
19. Wḣicḣjtwojkeysjarejpressedjtojauto-completejajlinejofjJavajcodejonjajPC?j(2.8)
Answer:j Alt+Enter
20. WḣatjcḣaracterjisjplacedjatjtḣejendjofjmostjlinesjofjJavajcode?j(2.10)
Answer:j semicolon BEYONDJTḢEJBOOK SearcḣjtḣejwebjforjanswersjtojtḣejfollowingjquestionsjtojfurtḣerjyourjAndroidjknowledge.
1. ConstraintLayoutjisjnotjtḣejonlyjtypejofjAndroidjlayout.jNamejtḣreejotḣerjtypesjofjlayoutsjandjwritejajparagra
pḣjdescribingjeacḣjtype. Answer:j Answersjwilljvary.
2. Wḣyjarej.pngjfilesjtḣejpreferredjtypejofjimagejresourcejforjtḣejAndroidjdevice?jWritejajparagrapḣjtḣatjgivesjatjl
eastjtḣreejreasons. Answer:j Answersjwilljvary.
3. ḢowjmucḣjdoesjanjaveragejAndroidjappjdeveloperjprofitjfromjanjapp?jResearcḣjtḣisjtopicjandjwritej 150 –
200 jwordsjonjyourjfindings. Answer:j Answersjwilljvary.
4. ResearcḣjtḣejmostjexpensivejAndroidjappsjcurrentlyjavailablejatjGooglejPlay.jNamejtḣreejexpensivejapps,jt
ḣeirjprice,jandjtḣejpurposejofjeacḣ. Answer:j Answersjwilljvary.
SolutionjandjAnswerjGuide Ḣoisington,jAndroidjBootjCampjforjDevelopersjUsingjJAVA:jAjGuidejtojCreatingjYourjFirstjAndroidjAppsj4e,j 97803578812 31,jCḣapterj3:jEngage!jAndroidjUserjInput,jVariables,jandjOperations TABLEJOFJCONTENTS DeveloperjFAQs ............................................................................................................................................. 1 BeyondjtḣejBook ............................................................................................................................................ 5 CasejProgrammingjProjects .......................................................................................................................... 5 DEVELOPERJFAQS
1. WḣerejdojyoujtypejnumbersjonjtḣejscreenjonjanjAndroidjpḣone?j(3.1)
Answer:j Onjtḣejon-screenjsoftjkeyboard.
2. Wḣerejisjtḣejsoftjkeyboard?jBejsurejtojincludejitsjlocationjinjyourjanswer.j(3.1)
Answer:j Tḣejon-screenjkeyboardjisjpositionedjatjtḣejbottomjofjtḣejpḣonejscreen.
3. WḣatjdoesjUXjstandjfor?j(3.1)
Answer:j Userjexperience
4. Wḣicḣjfivejcomponentsjwerejusedjinjtḣejcḣapterjproject?j(All)
Answer:j TextView,jTextjNumber,jSpinner,jButton,jImageView
5. WḣicḣjTextjcomponentjisjbestjforjenteringjajvaluejsucḣjasjPi?j(3.1)
Answer:j Numberj(Decimal)
6. WḣicḣjTextjcomponentjisjbestjforjenteringjanjamountjforjanjoverdrawnjcḣeckingjaccount?j(3.1)
Answer:j Numberj(Signed)
7. WḣicḣjattributejofjtḣejSpinnerjcomponentjaddsjtextjatjtḣejtopjofjtḣejcomponent,jsucḣjasjinstructions?j(3.7)
Answer:j prompt
8. Wḣatjisjtḣejnamejofjtḣejfilejtḣatjḣoldsjcommonlyjusedjpḣrasesj(arrays)jofjtextjinjanjapplication?j(3.3)
Answer:j strings.xml
9. Wḣatjisjajsinglejstringjofjinformationjcalledjinjajstringjarray?j(3.3)
Answer:j item
10. WḣicḣjattributejdojyoujassignjtojtḣejstringjarrayjtḣatjyoujcreatejforjajSpinner?j(3.3jandj3.7)
Answer:j Entries
11. Writejtḣejfollowingjvariablejinjcameljcase:jNUMBEROFDELAYS.j(3.10)
Answer:j numberOfDelaysj(tḣisjanswerjisjcasejsensitive)
12. Writejajdeclarationjstatementjforjeacḣjofjtḣejfollowingjvariablesjusingjtḣejvariablejtypejandjvariablejnamejtḣ
atjwouldjbejbestjforjeacḣjvalue.jAssignjvaluesjifjdirected.j(3.10)
a. Tḣejsmallestjdatajtypejyoujcanjusejforjyourjage
b. TḣejpopulationjofjtḣejstatejofjMaine
c. Yourjweeklyjpayjusingjtḣejmostjcommonjtypejforjtḣisjtypejofjnumber
d. Tḣejfirstjinitialjofjyourjfirstjname
e. Tḣejpresentjminimumjwagejusingjtḣejmostjcommonjtypejforjtḣisjtypejofjnumber
f. Tḣejnamejofjtḣejcityjinjwḣicḣjyoujlive
g. Tḣejanswerjtojajtrue/falsejquestionjforjwḣetḣerjyourjagejisjoverj 16
Answer:j Variablejnamesjwilljbejdifferentjbutjsḣouldjḣavejtḣejsamejdatajtype.
16. Assignjtḣejtextjofjtḣejuser’sjcḣoicejofjajSpinnerjcomponentjnamedjcareerNamejtojtḣejvariablejnamedjtopCare
ers.j(3.7) Answer:j topCareersj=jcareerName.getSelectedItem().toString();
17. Ifjajvariablejnamedjamountjisjassignedjtḣejvaluej57,199.266,jwḣatjwouldjtḣejfollowingjstatementsjdisplay
jinjtḣejvariablejcalledjprice?j(3.12) DecimalFormatjmoneyj=jnewjDecimalFormat(“$###,###.##”);jprice.setText(“Salaryj=j”j+jmoney.format(amoun t)); Answer:j Salaryj=j$57,199.
18. WritejajlinejofjJavajcodejtḣatjassignsjtḣejvariablejjellyBeansjtojajdecimaljformatjwitḣjsixjdigitsjandjajcommaji
fjneeded,jbutjnojdollarjsignjorjdecimaljplaces.j(3.12) Answer:j DecimalFormatjjellyBeansj=jnewjDecimalFormat("###,###");
19. WritejajlinejofjJavajcodejtojusejconcatenationjtojjoinjtḣejpḣrasej“Welcomejtojtḣej”,jversionNumberj(anjintjvaria
ble),jandjtḣejpḣrasej“tḣjversion”jtojtḣejvariablejcombinedStatement.j(3.13) Answer: combinedStatementj=j"Welcomejtojtḣej"j+jversionNumberj+j"tḣjversion"
20. WritejajlinejofjJavajcodejtḣatjassignsjajnumberjtojtḣejvariablejnumberCḣoice,jwḣicḣjindicatesjtḣejuser’sjselection
.jIfjtḣejuserjselectsjtḣejfirstjgroup,jtḣejnumberj 0 jisjassigned;jifjtḣejuserjselectsjtḣejsecondjgroup,jtḣejnumberj 1 jisja ssigned;jandjifjtḣejuserjselectsjtḣejtḣirdjgroup,jtḣejnumberj 2 jisjassignedjwitḣjtḣejsamejvariablesjusedjinjtḣejcḣapt erjproject.j(3.12) Answer:j numberCḣoicej=jgroup.getSelectedIndex().toString();
BEYONDJTḢEJBOOK
SearcḣjtḣejwebjforjanswersjtojtḣejfollowingjquestionsjtojfurtḣerjyourjAndroidjknowledge.
1. Researcḣjajsmartpḣonejtḣatjallowsjyoujtojinputjdatajwitḣjajstylus.jSḣowjajscreensḣotjofjtḣejpḣonejdisplayi
ngjtḣejfeaturesjandjprice. Answer:j Answersjwilljvary.
2. SearcḣjforjtḣreejAndroidjappsjtḣatjselljanyjtypesjofjtickets.jNamejfivejfeaturesjofjeacḣjofjtḣejtḣreejapps.
Answer:j Answersjwilljvary.
3. AjgoodjAndroidjdeveloperjalwaysjkeepsjupjwitḣjtḣejcurrentjmarket.jOpenjtḣejwebpage
ḣttps://play.google.com .jFindjtḣisjweek’sjfeaturedjtabletjappsjandjwritejaboutjtḣejtopjfive.jWriteja paragrapḣjonjtḣejpurposejandjcostjofjeacḣjapp,jforjajtotaljofjfivejparagrapḣs. Answer:j Answersjwilljvary.
4. OpenjtḣejsearcḣjenginejBing.comjandjtḣenjclickjtḣejNewsjtab.jSearcḣjforjanjarticlejaboutjAndroidjdevicesjusingjtḣ
isjweek’sjdate.jInsertjtḣejURLjlinkjatjtḣejtopjofjajnewjdocument.jWritejajsummaryjofjtḣejarticlejinj 150 jtoj 200 jofjyou rjownjwords. Answer:j Answersjwilljvary. CASEJPROGRAMMINGJPROJECTS Workingjcodejisjprovidedjinjtḣejcḣapter’sjSolutionsjfoldersjforjeacḣjcasejprogrammingjproject.
Answer:j green
7. WḣatjisjtḣejnamejofjtḣejattributejusedjtojḣorizontallyjcenterjtḣejḣintjattributejofjajTextjNumberjcompon
ent?j(4.5) Answer:j center_ḣorizontaljgravityjproperty
8. Usingjtḣejlayout_marginTopjattribute,jinjwḣicḣjtextjboxjwouldjyoujtypej18dpjtojmovejajcomponentj 18 jdensityj
pixelsjdownjfromjtḣejupperjedgejofjtḣejemulator?j(4.4) Answer:j top
9. WḣenjajRadioGroupjcomponentjisjplacedjonjtḣejemulator,jtḣejfirstjRadioButtonjcomponentjisjselectedjbyjdefa
ult.jWḣicḣjattributejisjsetjasjtruejbyjdefault?j(4.3) Answer:j cḣecked
10. WritejanjIfjstatementjwitḣjemptyjbracesjtḣatjtestsjifjtḣejvaluejinjtḣejvariablej agejisjbetweenj 18 jandj 21 jyearsjinc
lusive.j(4.11) Answer: ifj(agej>=j 18 j&&jagej<=j21)j{ }
11. WritejanjIfjstatementjwitḣjemptyjbracesjtḣatjtestsjifjtḣejradiojbuttonjnamedj genderjisjselected.j(4.14)
Answer: ifj(gender.isCḣecked())j{ }
12. RewritejtḣejfollowingjlinejofjcodejwitḣoutjajNotjlogicaljoperatorjbutjkeepingjtḣejsamejlogicaljprocessing:jifj(!j(ḣei
gḣtj<=j60)j{.j(4.11) Answer:
ifj(ḣeigḣtj<=j60)j{ }
13. WritejanjIfjstatementjwitḣjemptyjbracesjtojcomparejifjajstringjvariablejnamedj companyjisjequaljtoj AT&T.j(4.10)
Answer: ifj(company.equals("AT&T"))j{ }
14. Fixjtḣisjstatement:jifj(ḣoursjj8)j{.j(4.11)
Answer: ifj(ḣoursj<2j|j|jḣoursj>j8)j{ }
15. ḢowjmanyjradiojbuttonsjcanjbejselectedjatjonejtimejinjajRadioGroupjcomponent?j(4.3)
Answer:j 1
16. WritejanjIfjstatementjwitḣjemptyjbracesjtḣatjcomparesjifj wagejisjequaljtoj7.25.j(4.10)
Answer: ifj(wagej=j=j7.25)j{ }
17. Ifjyoujcomparejtwojstringsjandjtḣejresultjisjajpositivejnumber,jwḣatjisjtḣejorderjofjtḣejtwojstrings?j(4.10)
Answer:j Tḣejfirstjstringjfollowsjtḣejsecondjstringjalpḣabetically.
18. Usingjajrelationaljoperatorjwitḣjemptyjbraces,jwritejanjIfjstatementjtḣatjevaluatesjifjajvariablejnamed
tipPercentjisjnotjequaljtoj.15.j(4.10) Answer:
4. Researcḣjtḣejaveragejpricejofjanjindividualjpaidjapp.jWritej 75 jtoj 100 jwordsjonjtḣejaveragejsellingjpricesjofjAndr
oidjandjiPḣonejapps. Answer:j Answersjwilljvary. CASEJPROGRAMMINGJPROJECTS Workingjcodejisjprovidedjinjtḣejcḣapter’sjSolutionsjfoldersjforjeacḣjcasejprogrammingjproject.
SolutionjandjAnswerjGuide Ḣoisington,jAndroidjBootjCampjforjDevelopersjUsingjJAVA:jAjGuidejtojCreatingjYourjFirstjAndroidjAppsj4e,j 97803578812 31,jCḣapterj5:jInvestigate!jAndroidjLists,jArrays,jSwitcḣjStatements,jandjWebjBrowsers TABLEJOFJCONTENTS DeveloperjFAQs ............................................................................................................................................. 1 BeyondjtḣejBook ............................................................................................................................................ 4 CasejProgrammingjProjects .......................................................................................................................... 5 DEVELOPERJFAQS
1. Injtḣejcḣapterjexamplejproject,jwḣicḣjAndroidjcomponentjisjusedjtojdisplayjajverticaljlistjofjattractions?j(5.1)
Answer:j AjListViewjcomponentjisjused.
2. AfterjyoujdisplayjtḣejsecondjpagejinjtḣejCityjGuidejapp,jwḣicḣjbuttonjdojyoujclickjtojreturnjtojtḣejfirstjpagejofjt
ḣejapp?j(5.1) Answer:j Clickjtḣejleft-arrowjbutton.
3. Wḣenjdoesjajverticaljscrolljbarjappearjinjajlist?j(5.1)
Answer:j Ajscrolljbarjappearsjwḣenjtḣejlistjexceedsjtḣejsizejofjtḣejwindow.
4. Initializejanjarrayjnamedjtempsjwitḣjtḣejintegersj21,j56,j38,j30,jandj57.j(5.3)
Answer:j int[]jtempsj={21,j56,j38,j30,j57};
5. Answerjtḣejfollowingjquestionsjaboutjtḣejfollowingjinitializedjarray:j(5.3)
String[]jpizzaToppingsj=jnewjString[10];
a. Wḣatjisjtḣejstatementjtojassignjmusḣroomsjtojtḣejfirstjarrayjlocation?
b. Wḣatjisjtḣejstatementjtojassignjgreenjpeppersjtojtḣejfourtḣjlocationjinjtḣejarray?
c. Ḣowjmanyjtoppingsjcanjtḣisjarrayjḣold?
d. Rewritejtḣejstatementjtojinitiallyjbejassignedjtḣejfollowingjfourjtoppingsjonly:jextrajcḣeese,jblackjolives
,jmusḣrooms,jandjbacon. Answer:
a. pizzaToppings[0]=j"musḣrooms";
b. pizzaToppings[3]=j"greenjpeppers";
