開発 4 年目のアプリへの Kotlin 導入

DroidKaigi Prelude #dk_prelude

Transcript

1. ։ൃ೥໨ͷΞϓϦ΁ͷ,PUMJOಋೖ
   %SPJE,BJHJ1SFMVEF!%F/"
   

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2. ٶԼཽେ࿠
   $IBU8PSLגࣜձࣾ
   ΫϥΠΞϯτΞϓϦέʔγϣϯ։ൃ෦
   !SZVHPP@
   

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3. ,PUMJO
   

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4. ։ൃ೥໨ͷΞϓϦ΁ͷ,PUMJOಋೖ
   ‣ ೥ͷ(PPHMF*0Ͱެࣜ։ൃݴޠԽͨ͠
   Ҏલ͔Βಋೖ͸ݕ౼͍ͯͨ͠
   ެࣜαϙʔτ͕ಘΒΕͨ͜ͱͰ҆৺Λಘͨ
   ཌ೔͔ΒಋೖΛ։࢝ͨ͠ʜ͔͠͠ʜ
   ‣ طଘͷΞϓϦ΁ͷಋೖ͸Ͳ͏ͨ͠Βྑ͍ͷ͔ʁ
   Ͳ͔͜Βʁ
   શͯॻ͖׵͑Δʁ
   ϋοΩϦ͍ͯ͠ͳ͍͕ɺ΍ͬͯΈΑ͏
   

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5. ݁࿦શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍
   ‣ ಋೖ౰ॳ͸શͯΛ,PUMJOԽ͢Δ༧ఆ͸ແ͔ͬͨ
   ͸͡Ί͸৽ن%JBMPH'SBHNFOU͔Β։࢝
   ࣍ʹطଘͷ"DUJWJUZΛ,PUMJOԽ
   ͦͷޙɺ৽نίʔυΛ,PUMJOͰ௥Ճ
   ‣ +BWBͱͷͭͳ͗ࠐΈ͕ωοΫʹͳ͍ͬͯ͘
   !+WN'JFME!+WN4UBUJD!+WN0WFSMPBET
   SFUVSO6OJU*/45"/$&
   1MBUGPSN5ZQFT
   

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6. ݁࿦શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍
   ‣ !+WN'JFME!+WN4UBUJD!+WN0WFSMPBET
   DPNQBOJPOPCKFDUதʹॻ͘ͱTUBUJDʹల։
   class SomeFragment : Fragment() {
   companion object {
   @JvmField
   val TAG: String =
   SomeFragment::class.java.simpleName
   }
   }
   

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7. ݁࿦શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍
   ‣ !+WN'JFME!+WN4UBUJD!+WN0WFSMPBET
   DPNQBOJPOPCKFDUதʹॻ͘ͱTUBUJDʹల։
   class SomeFragment : Fragment() {
   companion object {
   @JvmStatic
   fun newInstance() = SomeFragment()
   }
   }
   

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8. ݁࿦શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍
   ‣ !+WN'JFME!+WN4UBUJD!+WN0WFSMPBET
   σϑΥϧτҾ਺͕͋Δ਺͚ͩΦʔόʔϩʔυ
   class SomeFragment : Fragment() {
   companion object {
   @JvmStatic
   @JvmOverloads
   fun newInstance(id: Long, name: String = "") =
   SomeFragment()
   }
   }
   

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9. ݁࿦શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍
   ‣ SFUVSO6OJU*/45"/$&
   ؔ਺ΛҾ਺ʹऔΔॲཧΛ+BWB͔Βݺͼग़͢ͱʁ
   class Model {
   fun async(callback: () -> Unit) {
   // Some asynchronous processing
   callback()
   }
   }
   

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10. ݁࿦શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍
    ‣ SFUVSO6OJU*/45"/$&
    lWPJEz͸ͳ͍ͷͰɺl6OJUzΛฦ͢ඞཁ͕͋Δ
    Model model = new Model();
    model.async(() -> {
    // Some callback processing
    return Unit.INSTANCE;
    });
    

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11. IUUQTEJTDVTTLPUMJOMBOHPSHUKBWBJOUFSPQVOJUDMPTVSFTSFRVJSFEUPSFUVSOLPUMJOVOJU
    !+WN7PJEͷఏҊ
    ೥ʹಉ͡໰୊ఏى
    

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12. ݁࿦શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍
    ‣ 1MBUGPSN5ZQFT
    /PO/VMM·ͨ͸/VMMBCMF͔΋͠Εͳ͍ܕ
    "OESPJE4%,͸جຊతʹ1MBUGPSN5ZQFT
    !/PO/VMM!/VMMBCMF͕෇͍͍ͯΕ͹ϋοϐʔ
    val inflater = LayoutInflater.from(this)
    ˡฦΓ஋ʹlz͕෇͍͍ͯΔ
    

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13. ݁࿦શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍
    ‣ "OESPJE4%,Ͱ͋Ε͹த਎ΛݟΔ
    public static LayoutInflater from(Context context) {
    LayoutInflater LayoutInflater = (LayoutInflater)
    context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    if (LayoutInflater == null) {
    throw new AssertionError("LayoutInflater not found.");
    }
    return LayoutInflater;
    }
    val inflater: LayoutInflater = LayoutInflater.from(this)
    ˡͲ͏΍ΒOVMMʹ͸ͳΒͳ͍Β͍͠
    ˣ/PO/VMMܕͱͯ͠ѻ͏Α͏ʹ͢Δ
    

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14. ݁࿦શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍
    ‣ "OESPJE4%,Ͱ͋Ε͹த਎ΛݟΔ
    lTPVSDFTz͕͋ΔͳΒ͹"OESPJE4UVEJPͰ
    $ISPNFͷ"OESPJE4%,4FBSDI΋Φεεϝ
    ‣ IUUQCJUMZBOESPJETELTFBSDI
    

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15. ݁࿦શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍
    ‣ "OESPJE4%,Ͱ͋Ε͹த਎ΛݟΔ
    lTPVSDFTz͕͋ΔͳΒ͹"OESPJE4UVEJPͰ
    $ISPNFͷ"OESPJE4%,4FBSDI΋Φεεϝ
    ‣ IUUQCJUMZBOESPJETELTFBSDI
    ˡιʔεϑΝΠϧ΁ͷϦϯΫ͕෇͘
    

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16. ݁࿦શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍
    ‣ ࣗ෼ୡ͕ॻ͍ͨίʔυ͸ʁ
    !/PO/VMM!/VMMBCMFΛ෇͚͍ͯ͘ʁ
    ͍ͬͦͷ͜ͱ,PUMJOʹͯ͠͠·ͬͨํ͕ʁ
    ‣ ͭͣͭ,PUMJOԽ͍ͯ͘͠
    ؔ࿈͢Δ+BWBʹ͸Ξ
    ϊςʔγϣϯΛ෇͚Δ
    যΒͣɺΏͬ͘ΓͱͰ΋શͯΛ,PUMJOԽ͢Δ
    

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17. ݱঢ়
    

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18. +BWBͷΛ,PUMJOԽ
    ‣ ϲ݄Ͱ೥ؒʹॻ͍ͨ+BWBͷ͕,PUMJOԽ
    ‣ ϑΝΠϧ਺
    ,PUMJO
    +BWB
    

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19. +BWBͷΛ,PUMJOԽ
    ‣ ϲ݄Ͱ೥ؒʹॻ͍ͨ+BWBͷ͕,PUMJOԽ
    ‣ νʔϜ΁ͷޮՌ
    /PO/VMM/VMMBCMFΛڧ͘ҙࣝ͢ΔΑ͏ʹͳͬͨ
    ‣ !/PO/VMM!/VMMBCMFΞ
    ϊςʔγϣϯͷ෇͚๨Ε͕ͳ͍
    ‣ ݴޠػೳʹ/VMMTBGFUZ͕͋Δํ͕๨Εͳ͍͠ҙࣝ͢Δ
    ‣ ͜Ε·Ͱ΋+BWBͰ0QUJPOBM"1*΋࢖͍ͬͯͨ
    ‣ ͨͩɺ0QUJPOBMΛ࢖͍ͬͯΔͱ,PUMJOଆͰ໘౗ʜʜ
    

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20. +BWBͷΛ,PUMJOԽ
    ‣ ϲ݄Ͱ೥ؒʹॻ͍ͨ+BWBͷ͕,PUMJOԽ
    ‣ νʔϜ΁ͷޮՌ
    ޿ൣғͷWBSΛආ͚ΔΑ͏ʹͳͬͨ
    ‣ ΠϯελϯεϓϩύςΟ͸Ͱ͖Δ͚ͩWBM
    ‣ ϝιου಺ͳͲڱ͍ൣғͰ͸WBS΋࢖͍ͬͯΔ
    ‣ -JTU.VUBCMF-JTUͳͲ΋ҙࣝతʹ࢖͍෼͚Λ͍ͯ͠Δ
    

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21. ͓͠·͍
    %SPJE,BJHJ1SFMVEF!%F/"
    

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