独自設計のAndroidアプリを設計ごとKotlinizeした話

by Shun Hosaka

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ಠࣗઃܭͷ AndroidΞϓϦΛ ઃܭ͝ͱKotlinizeͨ͠࿩ ϦΫϧʔτϚʔέςΟϯάύʔτφʔζ อࡔॣ 4IVO)PTBLB 1

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͸͡Ίʹ w อࡔॣ ΄͔͞͠ΎΜ w ৽ଔ̍೥໨ w (JU)VC 2JJUBͳͲ3FZVSOJCMF w ΩοζϦʔͱ͍͏ϓϩμΫτͷ10݉ΤϯδχΞ  ʢอҭԂ޲͚ͷαʔϏεʣ 2

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ࠓ೔ͷ಺༰ w ೖ͔ࣾͯ͠Βͪΐͪ͘ΐ͘΍͖ͬͯͨɺ  ࣗϓϩμΫτͷ,PUMJOԽΛҾ͖ܧ͍ͩ࿩ w ,PUMJOಛ༗ͷ࿩ΑΓ΋ɺॻ͖׵͑ͷ࿩͕ଟΊ w ॻ͖׵͑Ұؾʹ΍ͬͯ΍ͬͨʂͰ͸ͳ͘ɺ  ௕ظεύϯͰɺͲ͏Ҿ͖ܧ͍͔ͩͷ࿩ 3

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ܦҢ w ࠷ॳ͸ɺ֎஫Ͱ։ൃͨ͠ϓϩμΫτ w ಺੡ʹר͖औͬͯɺҰ෦,PUMJOʹϦϥΠτ͠ ͔ͯΒͷϦϦʔε w ಺੡Խͯ͠໿೥ɺࠓ೥ͷ݄ʹ"OESPJEͷ୲ ౰ऀ͕๻ʹ 4

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ݱঢ় w ,PUMJO཰ɺ͘Β͍ɻ w ओཁͳը໘͸େମϦϥΠτ͕ऴΘͬͯɺ࢒Γ ͸ઃܭը໘ͳͲ͕ଟ͍ɻ 5

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ॻ͖׵͑લ w +BWBͷίʔυ w ಠࣗઃܭɾൿ఻ͷλϨతͳίʔυ͕୔ࢁ͋Δ 6

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ॻ͖׵͑ޙ w ,PUMJOͷίʔυ w .71%%%Ͱ%BUB#JOEJOHͳͲ౰࣌ͷτϨϯυ 7

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ϦϥΠτͷਐΊํ w ը໘͝ͱʹϦϥΠτ  ɾϝϦοτɿ࡞ۀ୯Ґ͕෼͚΍͍͢ɾ෼୲͠΍͍͢  ɾσϝϦοτɿϥΠϒϥϦΛണ͕ͨ͠Γ͢Δͷʹ͸ಓ͕௕͍ w ૚͝ͱʹϦϥΠτ  ɾϝϦοτɿઃܭΛม͑΍͍͢  ɾσϝϦοτɿมߋ͕େ͖͘ͳΓ͕ͪɺҰ෦ϦϦʔε͕͠ʹ͍͘ w ϦϑΝΫλϦϯάϦϥΠτ  ɾϝϦοτɿεςοϓΛ౿ΜͰ៉ྷʹͰ͖Δ  ɾσϝϦοτɿ޻਺͕͔͞Ή 8

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ϦϥΠτͷਐΊํ 9 w ̋ը໘͝ͱʹϦϥΠτ w ૚͝ͱʹϦϥΠτ w ϦϑΝΫλϦϯάϦϥΠτ w ཧ༝ɿ w ҰؾʹϦϥΠτ͢ΔͷͰ͸ͳ͘ɺ௕ظతͳϦϥΠτΛ૝ఆͨ͠ w طଘίʔυʹςετ͕ͳ͘ɺͦ΋ͦ΋ϦϑΝΫλϦϯάʹ΋ة ݥ͕͋ͬͨ

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ϦϥΠτͷํ਑ w ࡞Γͷѱ͍ͱ͜Ζ͔ΒϦϥΠτ w ϦϥΠτޙ͸ඞͣςετΛॻ͘ w ϦϥΠτ͕ऴΘΔ·Ͱ͸ɺϦϥΠτͨ͠ଆ΁ͷϥΠϒϥϦೖΕସ ͑͸ͻ͔͑Δ w 6*ܥ͸ೖΕସ͑ͨΓͯ͠Δ w ϦιʔεͳͲ΋طଘͷ΋ͷΛ࢖༻͠ͳ͍Ͱɺ৽͍͠΋ͷΛෳ੡ͳͲ ͯ͠࢖༻͢Δ w OFX@ͳͲͷQSFpYΛ෇͚ͯΔ 10

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ࣦഊஊͱڭ܇ w Ϣʔβʔʹ͸ɺKBWB͔LPUMJOԽ͸େͯؔ͠܎ͳ͍  ɾۀ຿౎߹ͳͲͰɺ͕࣌ؒࠩ͠ഭͬͯΔ࣌ʹ΍Βͳ͍ w ࢓༷ͷมߋͱϦϥΠτ͸ಉ࣌ʹ΍Βͳ͍  ɾϦϥΠτ͔ͯ͠Βվम͢Δ͔ɺมߋ͔ͯ͠ΒϦϥΠτ w ةͳ͍ͳΒແཧ΍Γ,PUMJOͰॻ͔ͳ͍  ɾϏοτ഑ྻͷॲཧͳͲ,PUMJOͰஔ͖׵͑ʹ͍͘΋ͷ΋ ͋Δ  ɾҰ୴+BWBͷΫϥεͷ··ݺͼग़͢ɺͨͩ͠,PUMJOϑΥ ϧμʹೖΕ͓ͯ͘ 11

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ࠔΔ͜ͱ w ͕࣌ؒܦͭʹͭΕɺ,PUMJOԽͨ͠΋ͷͷதͰ ΋ϦϥΠτ͍ͨ͠΋ͷ͕ग़ͯ͘Δ w ϦϥΠτ͢Δͱ13ͷίʔυࠩ෼͕ଟ͘ͳͬͯɺ ϨϏϡʔͮ͠Β͍ 12

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νοϓε w Ϧιʔεͷ࢖༻਺Χ΢ϯτɿ  "OESPJE3FTPVSDF6TBHF$PVOU  IUUQTHJUIVCDPNOJPSHBJ"OESPJE3FTPVSDF6TBHF$PVOU w ফ͍ͨ͠Ϋϥεͷ্Ͱɺ  $PNNBOEΫϦοΫ  ͰґଘϑΝΠϧͷҰཡΛ֬ೝ͢Δ 13

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,PUMJOԽͯ͠ ม͑ͨॻ͖ํ 14

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"DUJWJUZͳͲͷϏϧμʔύλʔϯ 15 ը໘͝ͱͷextensionΛ࡞ͬͨɻ ը໘໊.ktͰτοϓϨϕϧͷextensionΛॻ͍͍ͯΔ // file privateͳͷͰଞ͔Βࢀর͞ΕΔ͜ͱ͸ͳ͍ private object Keys { const val hoge = "Sample.hoge" } fun SampleActivity.Companion.createIntent(context: Context, hoge: String): Intent = Intent(context, SampleActivity::class.java).apply { put(Keys.hoge, hoge) } fun SampleFragment.Companion.newInstance(hoge: String): SampleFragment = SampleFragment().apply { arguments = Bundle().apply { putString(Keys.hoge, hoge) } } fun SampleActivity.createFragment(): SampleFragment = SampleFragment.newInstance(intent.getStringExtra(Keys.hoge)) fun SampleFragment.parseHoge(): String = arguments.getString(Keys.hoge) ※SampleActivityͱSampleFragmentʹ͸ɺͦΕͧΕ companion object;ͱ͍͏ܗͷهࡌ͕ඞཁɻ

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ίʔϧόοΫ 16

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͓ΘΓʹ w ϦϥΠτ͸ແ஡ͤͣɺ௕ظઓΛݟਾ͑ͯ΍Δ w ݴޠ؀ڥ͕มΘΔͷͰɺઈରతͳํ਑͸ཱͯ ͳ͍ w ϦϥΠτ͕ϢʔβʔՁ஋ΛੜΉͱա৴͠ͳ͍ 17