RxJava実践入門

3Y+BWB࣮ફೖ໳ αϙʔλʔζษڧձ  ࠇ઒༸ !IZESBLFDBU

2 3Y+BWBͱ͸ w3Y 3FBDUJWF&YUFOTJPO ͷ+BWB࣮૷ w3FBDUJWF

3 3FBDUJWF1SPHSBNNJOHͱ͸ ˑBQSPHSBNNJOHQBSBEJHNPSJFOUFEBSPVOEEBUBGMPXTBOEUIF QSPQBHBUJPOPGDIBOHF˒ 3FBDUJWFQSPHSBNNJOH8JLJQFEJB IUUQTFOXJLJQFEJBPSHXJLJ3FBDUJWF@QSPHSBNNJOH 3FBDUJWF ر٦ةؿٗ٦׾㹑鎉׃גַ׵ծ㢌刿׾⠗乄ׇׁ׷ 5SBOTGPSNBUJPOBM 㢌䳔㘗
㢌侧ח㼎ׅ׷乼⡲׾אא鎸鶢

4 3FBDUJWF1SPHSBNNJOHͱ͸ 5SBOTGPSNBUJPOBM A = 2 B = 3 C
= (A + 1) x (B - 1) 3FBDUJWF Y " # $

5 3FBDUJWF1SPHSBNNJOHͱ͸ 5SBOTGPSNBUJPOBM 3FBDUJWF Y " # $
A = 2 B = 3 C = (A + 1) x (B - 1) A = 3

A = 2 B = 3 C = (A + 1) x (B - 1) A = 3

8 ͳͥ"OESPJEΞϓϦ։ൃͰ31͕஫໨͞ΕΔͷ͔ network.getDataA(new NetworkCall.Listener<String>() {  @Override public void success(String data)
{ network.getDataB(data, new NetworkCall.Listener<String>() {  @Override public void success(String data) { runOnUiThread(() -> { if (!isDestroyed()) { tv.setText(data);  } });  }‌    @Override public void failure(Throwable t) {}  });  } @Override public void failure(Throwable t) {}  });

9 ͳͥ"OESPJEΞϓϦ։ൃͰ31͕஫໨͞ΕΔͷ͔

10 3Y+BWBͱ͸ w3Y 3FBDUJWF&YUFOTJPO ͷ+BWB࣮૷ w3FBDUJWF w3Y

BMJCSBSZGPSDPNQPTJOHBTZODISPOPVTBOEFWFOUCBTFE QSPHSBNTVTJOHPCTFSWBCMFTFRVFODFT˒ 3FBDUJWF9*OUSP IUUQSFBDUJWFYJPJOUSPIUNM 11 3Yͱ͸

BMJCSBSZGPSDPNQPTJOHBTZODISPOPVTBOEFWFOUCBTFE QSPHSBNTVTJOHPCTFSWBCMFTFRVFODFT˒ 3FBDUJWF9*OUSP IUUQSFBDUJWFYJPJOUSPIUNM 12 3Yͱ͸ subscribe

BMJCSBSZGPSDPNQPTJOHBTZODISPOPVTBOEFWFOUCBTFE QSPHSBNTVTJOHPCTFSWBCMFTFRVFODFT˒ 3FBDUJWF9*OUSP IUUQSFBDUJWFYJPJOUSPIUNM 15 3Yͱ͸ completed

BMJCSBSZGPSDPNQPTJOHBTZODISPOPVTBOEFWFOUCBTFE QSPHSBNTVTJOHPCTFSWBCMFTFRVFODFT˒ 3FBDUJWF9*OUSP IUUQSFBDUJWFYJPJOUSPIUNM 16 3Yͱ͸ Observable subscribe(Subscriber) Subscriber onNext()
onCompleted() onError()

17 3Yͱ͸ BMJCSBSZGPSDPNQPTJOHBTZODISPOPVTBOEFWFOUCBTFE QSPHSBNTVTJOHPCTFSWBCMFTFRVFODFT˒ 3FBDUJWF9*OUSP IUUQSFBDUJWFYJPJOUSPIUNM Operator

18 3Yͱ͸ 1 2 3 4 5 6 < >
GPSxJO JGx % 2 == 0UIFO QVTIx * x UP list FOE FOE SFUVSOlist

19 3Yͱ͸ 1 2 3 4 5 6 < >
GJMUFS x % 2 == 0 NBQ x -> x * x

20 3Yͱ͸ 1 2 3 4 5 6

21 3Yͱ͸ 1 2 3 4 5 6 GJMUFS x
% 2 == 0 NBQ x -> x * x

22 3Yͱ͸ 1 2 3 4 5 6 GJMUFS x
% 2 == 0 NBQ x -> x * x 4 16 36

23 3Yͱ͸ 4 16 36 Observable.just(1, 2, 3, 4, 5,
6)  .filter(x -> x % 2 == 0)  .map(x -> x * x)  .subscribe(System.out ::println);

24 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔ wඇಉظॲཧ w6*Πϕϯτॲཧ wඇಉظॲཧ 6*Πϕϯτॲཧ

26 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔ @Override public void onCreate(Bundle savedInstanceState) { …  subscription
= network.getDataA()  .subscribeOn(Schedulers.io())  .flatMap(data -> network.getDataB(data))  .observeOn(AndroidSchedulers.mainThread())  .subscribe(  data -> tv.setText(data),  throwable -> Log.e(TAG, throwable.getMessage())  );  }  @Override public void onDestroy() {  super.onDestroy();  subscription.unsubscribe();  }

27 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔ @Override public void onCreate(Bundle savedInstanceState) { …  subscription
= network.getDataA()  .subscribeOn(Schedulers.io())  .flatMap(data -> network.getDataB(data))  .observeOn(AndroidSchedulers.mainThread())  .subscribe(  data -> tv.setText(data),  throwable -> Log.e(TAG, throwable.getMessage())  );  }  @Override public void onDestroy() {  super.onDestroy();  subscription.unsubscribe();  }

28 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔

30 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔ 6*؎كٝزⳢ椚 ׅץגWBMJE׌׏׋㜥さך׫ TVCNJUنةٝ׾FOBCMFחׅ׷

31 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔ private void setup() {  input1.addTextChangedListener(new TextWatcher() {  @Override
public void onTextChanged(CharSequence s, int start, int before, int count) {  input1Valid = s.length() > 0;  validate();  }  });  … }    private void validate() {  button.setEnabled(input1Valid && input2Valid && input3Valid);  } 8JUIPVU3Y+BWB

32 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔ 8JUI3Y+BWB private void setup() {  ArrayList<Observable<Boolean >> validators
= new ArrayList <>();  validators.add(RxTextView.textChanges(input1).map(s -> s.length() > 0));  …   Observable.combineLatest(validators, args -> {  for (Object a : args) {  if (!(Boolean) a) return false;  }  return true;  }).subscribe(button ::setEnabled);  }

38 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔ ꬊず劍Ⳣ椚 6*؎كٝزⳢ椚

39 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔ ꬊず劍Ⳣ椚 6*؎كٝزⳢ椚 أؙٗ٦ָٕ⨡姺׃׋׵ꬊず劍Ⳣ椚׾㨣׭ծأؙٗ٦ָٕ Ꟛ㨣׃׋׵װ׭׷ ؕؐٝزָחז׏׋׵ 穠卓ָ邌爙ׁ׸׷

40 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔ ConnectableObservable<Boolean> idling =  RxAbsListView.scrollEvents(listView)  .map(event -> event.scrollState()  ==
AbsListView.OnScrollListener.SCROLL_STATE_IDLE)  .distinctUntilChanged()  .publish(); أؙٗ٦ٕךꟚ㨣⨡姺׾嗚濼ׅ׷0CTFSWBCMF

41 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔ أؙٗ٦ٕךꟚ㨣⨡姺׾嗚濼ׅ׷0CTFSWBCMF ConnectableObservable<Boolean> idling =  RxAbsListView.scrollEvents(listView)  .map(event -> event.scrollState() 
== AbsListView.OnScrollListener.SCROLL_STATE_IDLE)  .distinctUntilChanged()  .publish();

43 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔ أؙٗ٦ָٕ⨡姺׃׋׵ꬊず劍Ⳣ椚׾Ꟛ㨣ׅ׷ final Subscription s = idling.startWith(true)  .filter(b ->
b)  .flatMap(aBool -> serivce.getData())  .subscribe(l -> showLog("Success!"));

44 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔ أؙٗ٦ָٕꟚ㨣׃׋׵ꬊず劍Ⳣ椚׾⨡姺ׅ׷ final Subscription s = idling.startWith(true)  .filter(b ->
b)  .flatMap(aBool -> serivce.getData()) .takeUntil(idling.filter(b -> !b))  .repeatWhen(completes -> completes.switchMap(  c -> idling.filter(b -> b)))  .subscribe(l -> showLog("Success!"));

45 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔ أؙٗ٦ָٕꟚ㨣׃׋׵ꬊず劍Ⳣ椚׾⨡姺ׅ׷ final Subscription s = idling.startWith(true)  .filter(b ->

47 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔ أؙٗ٦ָٕ⨡姺׃׋׵ⱄTVCTDSJCFׅ׷ final Subscription s = idling.startWith(true)  .filter(b ->

49 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔ 㹋遤ׅ׷أٖحس׾䭷㹀ׅ׷ final Subscription s = idling.startWith(true)  .subscribeOn(Schedulers.io())  .filter(b
-> b)  .flatMap(aBool -> serivce.getData())  .takeUntil(idling.filter(b -> !b))  .repeatWhen(completes -> completes.switchMap(  c -> idling.filter(b -> b)))  .observeOn(AndroidSchedulers.mainThread())  .subscribe(l -> showLog("Success!"));

50 3Y+BWBͰͳʹ͕Ͱ͖Δͷ͔ ConnectableObservable<Boolean> idling =  RxAbsListView.scrollEvents(listView)  .map(event -> event.scrollState()  ==
AbsListView.OnScrollListener.SCROLL_STATE_IDLE)  .distinctUntilChanged()  .publish();  subscriptions.add(idling.connect());    subscriptions.add(idling.startWith(true)  .subscribeOn(Schedulers.io())  .filter(b -> b)  .flatMap(aBool -> serivce.getData())  .takeUntil(idling.filter(b -> !b))  .repeatWhen(completes -> completes.switchMap( c -> idling.filter(b -> b)))  .observeOn(AndroidSchedulers.mainThread())  .subscribe(l -> showLog("Success!")));

51 3Y+BWBͷϝϦοτσϝϦοτ ًٔحز ˖ ؎كٝزװꬊず劍Ⳣ椚ָ䪔ְװְׅ ˖ 朐䡾㢌侧ָ㼰זֻג幥׬ ˖ ر٦ةؿٗ٦ך鋅鸐׃ָ葺ֻז׷ رًٔحز
˖ 湫䠬涸הכꣲ׵זְ ˖ ⢪ְֿזׅחכ䢪׸ָ䗳銲 ˖ ➬穈׫׾椚鍑׃גְזְה縐ח䅹׶װְׅ

52 ࢀߟ ˖ 3FBDUJWFQSPHSBNNJOH8JLJQFEJB UIFGSFFFODZDMPQFEJB  IUUQTFOXJLJQFEJBPSHXJLJ3FBDUJWF@QSPHSBNNJOH ˖ ++6(ش؎زإىش٦ד3FBDUJWF4USFBNTחאְג涪邌׃ת׃׋  IUUQPLBQJFTIBUFCMPKQFOUSZ ˖
3FBDUJWF9  IUUQSFBDUJWFYJP ˖ &YQMPSJOH3Y+BWBGPS"OESPJE (050DQI0DUPCFS   IUUQTTQFBLFSEFDLDPNKBLFXIBSUPOFYQMPSJOHSYKBWBGPS BOESPJEHPUPDQIPDUPCFS ˖ 3FBDUJWF1SPHSBNNJOHXJUI+%,'MPX"1*  IUUQTDPNNVOJUZPSBDMFDPNEPDT%0$

RxJava実践入門

RxJava実践入門

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