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Androidアプリ開発の面白いトコロ
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akatsuki174
May 22, 2019
Programming
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Androidアプリ開発の面白いトコロ
2019/05/22 Web Creators MeetUp ビアバッシュLT会 #11
akatsuki174
May 22, 2019
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Transcript
@akatsuki174 AndroidΞϓϦ։ൃͷ ໘ന͍τίϩ
ࣗݾհ
• ਢ౻ຘʢ@akatsuki174ʣ • iOSΤϯδχΞ • TechTrain ϝϯλʔ • ϋϯυϝΠυ࡞Ո •
DXELओ࠵ • TECH PLAYঁࢠ෦ ڞಉද • Women In Technology (WITY) ઃ ϝϯόʔ ͦͷଞॾʑ
֓ཁ
;ΜΘΓ֓ཁ ࠷ۙAndroidΞϓϦ։ൃΛ࢝Ίͨࢲͷࢹ͔Βɺ ʮAndroidʢKotlinʣͬͯ͜Μͳ͜ͱͰ͖ΔΜͩʯ ͱࢥͬͨͷΛ٧Ί߹Θ͓ͤͯ͑͠·͢ɻ ڵຯΛ͖͔͚࣋ͭͬʹͳΕͱ… ※ࠓհͨ͜͠ͱ ≠ Android։ൃͰॏཁͳ͜ͱ
ࠓ͢͜ͱ ɾKotlin͔Θ͍͍ ɾϨΠΞτ࡞ָ͕ ɾAndroidͰଞͷΞϓϦͷϦιʔε͕͑Δ ɹɾจࣈྻ ɹɾը૾
Kotlin
Kotlinͱ ɾJetBrains͕2011ʹൃදͨ͠ݴޠ ɾJavaͱ100%૬ޓӡ༻Մೳ ɾɾJavaίʔυΛϖʔετͨ͠ΒࣗಈͰKotlin ɹɹίʔυʹॻ͖͑ͯ͘ΕͨΓ ɾGoogle I/O 2017ʹͯެࣜ࠾༻ ɾGoogle I/O
2019ʹͯਪݴޠ
Kotlinͷಛ ɾ੩తܕ͚ ɾΦϒδΣΫτࢦ ɾNull҆શ ɾ؆ܿʹॻ͚Δ ɾΫϥΠΞϯταΠυαʔόαΠυॻ͚Δ etc…
KotlinΫΠζ ̍- ͬͱ؆ܿʹॻ͚·͢ɻͲ͏ॻ͚ΔͰ͠ΐ͏ʁ if (data == null) return
KotlinΫΠζ ̍- ͑ data ?: return ʮ?:ʯΤϧϏεԋࢉࢠɻԋࢉࢠͷࠨଆ͕nullͰ ͳ͚ΕͦΕΛฦ͠ɺnullͩͬͨΒӈଆΛฦ͢ɻ ※ KotlinͰreturnࣜ
KotlinΫΠζ ̎- Javaͩͱ͜ͷΑ͏ʹॻ͘ॲཧɺKotlinͩͱ ͲͷΑ͏ʹॻ͚ΔͰ͠ΐ͏͔ʁ if (anyObject instanceof String) {
String str = (String)anyObject; str.length; }
KotlinΫΠζ ̎- ͑ if (anyObject is String) { anyObject.length }
ܕͷνΣοΫͱΩϟετΛಉ࣌ʹߦͬͯ͘ΕΔ ʢεϚʔτΩϟετʣ
ϨΠΞτ࡞
AndroidͷϨΠΞτ࡞ ɾxmlͰUIཁૉΛهड़͍ͯ͘͜͠ͱɺktϑΝΠϧ ɹଆͰϨΠΞτཁૉͷΠϯελϯεΛ࡞͢Δ ɹ͜ͱͰ͖Δ ɾxmlͰUIΛهड़͢Δͱɺಈ࡞੍ޚίʔυͱ ɹUIදࣔίʔυΛ͚Δ͜ͱ͕Ͱ͖Δ
AndroidͷϨΠΞτ࡞ ɾLayout Editor Λ͏ͱɺGUIͰૢ࡞͢Δ͚ͩͰ ɹϨΠΞτΛ࡞͢Δ͜ͱ͕Ͱ͖Δ
σϞ ※ ͵Δ͵Δಈ͘GUIɺϨΠΞτ࡞ͷ؆୯͕͞ ɹΘ͔ΔΑ͏ͳͷΛݟͤΔ
ଞΞϓϦͷϦιʔεΛ͏
DroidKaigiʹͯ ʮAndroidଞͷΞϓϦͷϦιʔεΛ͏͜ͱ͕ Ͱ͖Δʯͱ͍͏Λฉ͖ɺͱͯؾʹͳ͍ͬͯͨ ͷͰࠓճௐͯΈͨ
σϞ Qiitaهࣄ https://qiita.com/akatsuki174/items/ ff57714cbc57e5ce9909 αϯϓϧίʔυ https://github.com/akatsuki174/ UseOtherAppResourceSample
จࣈྻΛऔಘ͢Δίʔυ
ը૾Λऔಘ͢Δίʔυ
એ
None
͝ਗ਼ௌ ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ