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KotlinͰAndroidΞϓϦέʔ γϣϯ࡞ͬͯΈͨ2014ॳՆ 2014-07-04

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About me Twitter : @sys1yagi! Blog : http://sys1yagi.com! ! Android Engineer at

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ࠓ೔࿩͢ࣄ • ͜ΜͳAndroidΞϓϦΛKotlin+Android StudioͰ ࡞ͬͯΈ·ͨ͠ • Kotlin+Android Studio͸͜͏΍ͬͯ࢝ΊΔ • AndroidΞϓϦΛ࡞Δʹ౰ͨͬͯ࢖ͬͨKotlinͷػೳ • ෆศͳϙΠϯτɺ͸·ͬͨϙΠϯτू

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͜ΜͳAndroidΞϓϦΛKotlin+Android StudioͰ࡞ͬͯΈ·ͨ͠ open Service DB load rss feeds write read ιʔε͸ίνϥ -> https://github.com/sys1yagi/goat-reader-2-android-prototype

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Kotlin for Android Studio • Kotlin͸JetBrains͕ࣾ࡞͍ͬͯΔ • Android Studio͸IntelliJϕʔε • Kotlin༻pluginΛఏڙ͍ͯ͠Δ

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Kotlin pluginΛΠϯετʔϧ update͖ͱΔ…

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KotlinϓϩδΣΫτΛ࡞Δ 1 ී௨ʹAndroidϓϩδΣΫτΛ࡞Δ

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KotlinϓϩδΣΫτΛ࡞Δ 2 MainActivityͳͲΛKotlin Fileʹίϯόʔτ͢Δ

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KotlinϓϩδΣΫτΛ࡞Δ 3 ઃఆΛଅ͞ΕΔͷͰKotlinόʔδϣϯΛબ୒

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KotlinϓϩδΣΫτΛ࡞Δ 4 ͍͍ײ͡ʹbuild.gradle͕ੜ੒͞Ε·͢ʂ

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AndroidΞϓϦΛ࡞Δʹ౰ͨͬͯ ࢖ͬͨKotlinͷػೳ • ֦ுϝιου • ύλʔϯϚον • ΫϥεΦϒδΣΫτ

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֦ுϝιου http://taro.hatenablog.jp/

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֦ுϝιου

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֦ுϝιου ָͩ

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ύλʔϯϚον ͳΜ͔৭ʑͰ͖Δ

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ΫϥεΦϒδΣΫτ staticͱಉ͡

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ෆศͳϙΠϯτ ͸·ͬͨϙΠϯτू • ΄΅ݴޠతʹ͸ෆຬ͸ͦΜͳʹͳ͍Ͱ͢ɻ΄΅ pluginͷ໰୊Ͱ͢ɻ

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ςετͷδΣωϨʔτΛαϙʔ τͯ͠ͳ͍ खಈͰ

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ςετσΟϨΫτϦΛbuild.gradle Ͱ໌ࣔతʹࢦఆ͠ͳ͚Ε͹ͳΒͳ͍

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layoutͷidͰR.javaʹඈΜ͡Ό͏ expected real…

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javaClass()͕ΊΜͲ͍

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ίϯύΠϧ͢Δ౓ͳΜౖ͔ΒΕΔ ౖͬ͛͑͢Δ

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type T͕΍͹͍

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type T͕΍͹͍

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Null҆શ͕΍͹͍ ৭Μͳॴʹ?ͱ!!͕ग़ݱ࢝͠ΊΔ !!͸ઃܭΛݟ௚͢γάφϧ͔΋͠Εͳ͍ Android Fragmeworkଆ͕Nullable͡Όͳ͍৔߹͕ଟͯ͘ ͦͷลͰࣄނΔࣄ͕ଟ͍

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·ͱΊ • KotlinšŘŠŖ • Android Studio޲͚ͷplugin͸·ͩ·͚ͩͩͲݸਓ Ͱࢼ͢෼ʹ͸े෼ΠέͯΔͱࢥ͏ • https://github.com/JetBrains/kotlin ௚઀contribute͠ ͨΖɺΈ͍ͨͳؾ͕࣋ͪඞཁ͔΋