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Development
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Android
Resources
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Resources
Ac-vity1
Drawables1 Layout1 Values1
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Resources
Ac-vity1
Drawables1 Layout1 Values1
Drawables2
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Resources
Ac-vity1
Drawables1 Layout1 Values1
Drawables2
Layout2 Values2
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Resources
Ac-vity1
Drawables1 Layout1 Values1
Drawables2
Layout2 Values2
Ac-vity2 Ac-vity3
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Resources CentralpartofAndroidsflexibilitytochange Resourcefileisbasicallyafileoravaluethatis
boundtoanexecutableapplica-on
Canchangethefileswithoutrecompilingandredeployingtheapplica-on
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Resources Examples
StringsColorsBitmaps
Insteadofhardcoding,useIDsinstead Letsyouchangecontentwithoutchangingthe
code
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StringResources
Definemul-plestringsinoneormorexmlresourcesfile
Residein/res/valuessubdirectory Filenameasstrings.xml E.g.
hello
helloappname
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StringResources
IDEwillmakeuseofaapt(AndroidAssetPackagingTool)toautoma-callycreateor
updateajavaclassinapplica-onrootpackage
CalledR.javawithuniqueIDsfortheresourcesspecified
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StringResources
Whathappensaerconver-ng? publicfinalclassR
{
publicsta-cfinalclassstring{
publicsta-cfinalinthello=0x7f040000;
publicsta-cfinalintapp_name=0x7f040001;
}
}
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LayoutResources
Viewofascreen E.g.
setContentView(R.layout.main) Callsoutaconstantcalledmain MainpointstoaviewdefinedbyanXMLlayout
resourcefile
Expectsafiletobecalledmain.xmlinres/layout/. i.e.res/layout/main.xml
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LayoutResources
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LayoutResources
Aboveexample,rootnodecalledLinearLayoutwhichcontainsaTextViewfollowedbyabuon
Aseparatelayoutfileforeachscreen ifyouhavetwofilesunder/res/layout/calledfile1.xml
andfile2.xml,youllhavethefollowingentriesinR.java:publicsta-cfinalclasslayout{
publicsta-cfinalintfile1=0x7f030000;
publicsta-cfinalintfile2=0x7f030001;
}
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ColorResources
Localizecolorsandapplythemes AccesstheminjavacodethroughtheirIDs .R.colornamespace.
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ResourceReferenceSyntax @+id/text1 @[package:]type/name resourcetypenamespacesavailableinR.java:
R.drawable R.id R.layout R.string R.ar
XMLresourcereferencesyntaxareasfollows: Drawable Id Layout String Ar
Ifpackagenotspecified,itwillbebasedonthelocalresourcesandtheapplica-onlocalR.javapackage
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Compiled/NonCompiledResource
Sofarallthexmlexamplesarecompiledresources Getscompiledintobinaryformatbeforebecomingpartof
theinstallablepackage
UseAndroidsuppliedXMLreaderstoreadtheXMLnodes NonCompiledresource
Placedinres/raw/directory Getscopiedasistothedevice ExplicitstreambasedAPIstoreadthesefiles
E.g.Audio/videofiles
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Resourcedirectories
Defaultresources Usedregardlessofthedevice
configura-on
Whennoalterna-veresourcesmatchthecurrentconfigura-on
E.g. Res/layout/
Alternateresources Designedforusewithspecific
configura-on
Appendanappropriateconfigura-onqualifiertothedirectoryname
E.g. Res/layoutland
