Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Google I/O 2018’s Extensions🦔
Search
Hunachi
September 20, 2018
Technology
1
2.7k
Google I/O 2018’s Extensions🦔
Kotlin大好き!Kotlin愛好会 vol4で発表しました.
是非Googleさんを参考にしましょう!
Hunachi
September 20, 2018
Tweet
Share
More Decks by Hunachi
See All by Hunachi
TopAppBar Composableをカスタムする
hunachi
0
320
PDF Viewer作成の今までとこれから
hunachi
0
3.7k
Google Play ポリシー対応周りの整理/改善をしてみた
hunachi
0
410
レビューダイアログ機能の取り組みAndroid編 / Review Dialog for Android
hunachi
0
1.8k
Git Hands On for my lab.
hunachi
0
120
ML Kitはいいぞ!
hunachi
0
870
Paging Library は便利だぞ!
hunachi
1
480
Androidについて.
hunachi
0
140
Other Decks in Technology
See All in Technology
S3アクセス制御の設計ポイント
tommy0124
3
200
Snowflake Intelligenceにはこうやって立ち向かう!クラシルが考えるAI Readyなデータ基盤と活用のためのDataOps
gappy50
0
220
「Linux」という言葉が指すもの
sat
PRO
4
130
Rustから学ぶ 非同期処理の仕組み
skanehira
1
140
「どこから読む?」コードとカルチャーに最速で馴染むための実践ガイド
zozotech
PRO
0
400
未経験者・初心者に贈る!40分でわかるAndroidアプリ開発の今と大事なポイント
operando
5
550
5分でカオスエンジニアリングを分かった気になろう
pandayumi
0
240
allow_retry と Arel.sql / allow_retry and Arel.sql
euglena1215
1
170
250905 大吉祥寺.pm 2025 前夜祭 「プログラミングに出会って20年、『今』が1番楽しい」
msykd
PRO
1
890
Automating Web Accessibility Testing with AI Agents
maminami373
0
1.3k
2025年夏 コーディングエージェントを統べる者
nwiizo
0
170
AWSを利用する上で知っておきたい名前解決のはなし(10分版)
nagisa53
10
3.1k
Featured
See All Featured
How GitHub (no longer) Works
holman
315
140k
Context Engineering - Making Every Token Count
addyosmani
2
41
Navigating Team Friction
lara
189
15k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
33
2.4k
Documentation Writing (for coders)
carmenintech
74
5k
Practical Orchestrator
shlominoach
190
11k
Mobile First: as difficult as doing things right
swwweet
224
9.9k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
49
3k
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
tammyeverts
53
2.9k
Designing Experiences People Love
moore
142
24k
Learning to Love Humans: Emotional Interface Design
aarron
273
40k
How to Ace a Technical Interview
jacobian
279
23k
Transcript
ˏ)VOBDIJ ,PUMJOѪձWPM (PPHMF*0`T &YUFOTJPOT
ࣗݾհ ;ͳͪ ߴઐੜ (JU)VC!)VOBDIJ 5XJUUFS!@IVOBDIJ ,PUMJOΛॻ͖࢝Ί͔ͯΒϓϩάϥϛϯά͕͖ʹͳͬͨɽ ࠓ8BOUFEMZ*OD͞ΜͷݩͰΠϯλʔϯதͰ͢ʗʢ,PUMJOಋೖ͠·ͨ͠ʣ
$PEFɿIUUQTHJUIVCDPNHPPHMFJPTDIFE 0⒏DJBM#MPHɿIUUQTNFEJVNDPNBOESPJEEFWFMPQFSTHPPHMFJPBQQ BSDIJUFDUVSFBOEUFTUJOHGFGDFC (PPHMF*0BQQ
w ,PUMJO w ࠓྫΑΓσεϚͯ͠ͳͦ͞͏ ʢ$POUSJCVUJPO͚ͩͰݴ͑ͳ͍͔ ͚ͩͲʣ
6TFE5PPMBOE-JCSBSZ w 'JSF4UPSFɼ'JSF#BTF"VUIFOUJDBUJPO w "OESPJEY w %BHHFSɼ5JNCFSɼ(TPOɼ5ISFF5FOɼ$SBTIMZUJDTɼ(MJEFɼ&TQSFTTPɼ .PDLJUPɼ+6OJUɼMFBLDBOBSZɽ
"SDIJUFDUVSF w $MFBO"SDIJUFDUVSF w 1SFTFOUBUJPOɿ7JFXˍ7JFX.PEFM w %PNBJOɿ6TF$BTF w %BUBɿ3FQPTJUPSZ 6TFS.BOBHFS
w .77.
None
&YUFOTJPOT /PUBMM FYUFOTJPOTPG NZGBWPSJUF
// Listͱ͔ͰView͕ΨλϯͬͯͳͬͨΓ͢ΔͷΛ͙༻ɽ inline fun <T : ViewDataBinding> T.executeAfter(block: T.() ->Unit){
block() // ͙͢ʹbinding͍ͤͨ࣌͞ʹ͏ɽ executePendingBindings() } // ༻ྫ binding.executeAfter { //͜͜Ͱbind͢Δɽ event = item } ᶃ
// TransitionΛԆͤ͞Δ fun Activity.postponeEnterTransition(timeout: Long) { postponeEnterTransition() window.decorView.postDelayed(timeout) { startPostponedEnterTransition()
} } // ༻ྫ activity?.postponeEnterTransition(500L) ᶄ
// ॳظԽɼࢀর͕ৗʹγϯάϧεϨουͰ͔͠ߦΘΕͳ͍࣌༻ɽ fun <T> lazyFast(operation: () -> T): Lazy<T> =
lazy(LazyThreadSafetyMode.NONE) { operation() } // SYNCRONIZED: σϑΥϧτɽ୯ҰεϨου͔ΒͷॳظԽͰɼෳεϨου͔Βͷࢀর͕Մೳɽ // PUBLICATION: ෳεϨου͔ΒॳظԽ͠Α͏ͱ͢Δࣄ͕Մೳɽ // ༻ྫ private val day: Int by lazyFast { val args = arguments ?: throw IllegalStateException("Missing arguments!") args.getInt(ARG_INT) } ᶅ
inline fun <reified VM : ViewModel> FragmentActivity.viewModelProvider( provider: ViewModelProvider.Factory )
= ViewModelProviders.of(this, provider).get(VM::class.java) // ༻ྫ // Before val viewModel: HogeViewModel = ViewModelProviders.of(this, viewModelFactory) .get(HogeViewModel::class.java) //After val viewModel: HogeViewModel = viewModelProvider(viewModelFactory) ᶆ
fun ViewGroup.inflate( @LayoutRes layout: Int, attachToRoot: Boolean = false ):
View { return LayoutInflater.from(context) .inflate(layout, this, attachToRoot) } // ༻ྫ … Holder( parent.inflate(VIEW_TYPE_HEADING, false) ) ᶇ
inline fun FragmentManager.inTransaction( func: FragmentTransaction.() -> FragmentTransaction ) { beginTransaction().func().commit()
} // ༻ྫ supportFragmentManager.inTransaction { add(FRAGMENT_ID, fragment) } ᶈ
// enumΫϥεΛbundleʹೖΕΕΔܗʹ͢Δ fun <T : Enum<T>> Bundle.putEnum(key: String, value: T)
= putString(key, value.name) // ↑ͰೖΕͨenumΫϥεΛऔΓग़͢ inline fun <reified T : Enum<T>> Bundle.getEnum(key: String): T = enumValueOf(getString(key)) // ParcelʹbooleanΛॻ͖ࠐΉ fun Parcel.writeBoolean(value: Boolean) = writeInt(if (value) 1 else 0) // ↑Ͱมͨ͠booleanΛಡΈࠐΉ fun Parcel.readBoolean() = readInt() != 0 ᶉ
// ༻ྫ // ಡΈ͍͢ʂ pacel.apply { writeInt(state) writeInt(peekHeight) writeBoolean(isFitToContents) writeBoolean(isHideable)
writeBoolean(skipCollapsed) writeBoolean(isDraggable) }
fun <T> MutableLiveData<T>.setValueIfNew(newValue: T) { if (this.value != newValue) value
= newValue } fun <T> MutableLiveData<T>.postValueIfNew(newValue: T) { if (this.value != newValue) postValue(newValue) } // ObserverଆͰఆͨ͠ํ͕҆શͳؾ͕͢Δ͚ͲͲ͏ͳΜͩΖ͏ɽɽ ᶊ
fun <X, Y> LiveData<X>.map(body: (X) -> Y): LiveData<Y> { return
Transformations.map(this, body) } fun <X, Y> LiveData<X>.switchMap(body: (X) -> LiveData<Y>): LiveData<Y> { return Transformations.switchMap(this, body) } ᶋ
// ༻ྫ liveData = parentLiveData.map { (it as? Result.Success)?.data?: 0
} liveData = parentLiveData.switchMap { if(value == null) dataLiveData else parentLiveData } // ࠷ॳ֦ுؔͬͯࣄʹؾ͔ͮͣɼڻ͍ͨɽ
val <T> T.checkAllMatched: T get() = this // ༻ྫ //
OK when (sealed) { ONE -> {…} TWO -> {…} }.checkAllMatch // error when (sealed) { ONE -> {…} //TWO -> {…} }.checkAllMatch ᶌ
w ஸೡʂ ͜ͷ࣮७ਮʹ಄ ͍͍ͱࢥ͏ɽ
5IBOLZPV ,PUMJOՄѪ͍ʂ