Rx java x retrofit

2015.11.27
オープンソースライブラリ研究会
Android編
Shun Nakahara

自己紹介
✤ Shun Nakahara
✤ 27
✤ iOS/Android
✤ iOS 大好きです！
✤ @shun_nakahara

全員エンジニア合コンをやってみた
人生初の合コン

一生に一度のかけがえのない人生の成功をサポートする

iOS で発表したかったんですが…

RxJava + Retrofit
✤ RxJava を簡単に紹介
✤ Retroﬁt を簡単に紹介
✤ 二つを合わせたテクニックを紹介

RxJava
✤ Reactive Extensions Java
✤ リアクティブプログラミングをするためのライブラリ
✤ 同期処理、非同期処理、遅延実行…

RxJava
✤ 基本的な使い方
✤ 非同期処理
✤ 同期処理
✤ RxAndroid

Gradle の準備
// RxJava 
compile 'io.reactivex:rxjava:1.0.15'

基本的な書き方
String name = “shun";
 
Subscription subscription = Observable.from(new String[]{name}).subscribe(new Action1<String>() { 
@Override 
public void call(String string) { 
String name = "nakahara " + string; 
System.out.print(name); 
} 
});
 
subscription.unsubscribe();

基本的な処理を便利に！？
Observable.OnSubscribe<String> onSubscribe = new Observable.OnSubscribe<String>() { 
@Override 
public void call(Subscriber<? super String> subscriber) { 
final String name = "shun"; // 重い処理などをここで行う。 
String fullName = "nakahara " + name; 
 
subscriber.onNext(fullName); 
subscriber.onCompleted(); 
} 
};
 
Subscription subscription = Observable.create(onSubscribe).subscribe(new Action1<String>() { 
@Override 
public void call(String string) { 
System.out.print(string); 
} 
});
 
subscription.unsubscribe();

非同期処理
@Override 
 
// 通信処理 
 
boolean isSuccess = false; 
String response = "response"; 
if (isSuccess) { 
subscriber.onNext(response); 
} else { 
subscriber.onError(new NetworkErrorException("connect error")); 
} 
} 
}; 
Observable<String> stringObservable = Observable.create(onSubscribe); 
stringObservable.subscribe(new Observer<String>() { 
@Override 
public void onCompleted() { 
// network completed 
} 
 
@Override 
public void onError(Throwable e) { 
// network error message 
} 
 
@Override 
public void onNext(String string) { 
// network success response 
} 
});

同期処理を書きたい時
@Override 
 
// 通信処理 
 
if (isSuccess) { 
} else { 
} 
} 
}; 
 
Observable<String> stringObservable = Observable.create(onSubscribe); 
 
String response = stringObservable.toBlocking().single(); 
if (response == null) { 
// error 
} else { 
// success 
}

気づいた人いますか？

メソッドに切す
public Observable<String> request() { 
@Override 
 
// 通信処理 
 
if (isSuccess) { 
} else { 
} 
} 
}; 
return Observable.create(onSubscribe); 
}

非同期処理
request().subscribe(new Observer<String>() { 
@Override 
} 
 
@Override 
// network error 
} 
 
@Override 
public void onNext(String s) { 
// response call back 
} 
});

同期処理
String response = request().toBlocking().single(); 
if (response == null) { 
// network error 
} else { 
}

なんだかこれだと使えそうな
気がしますね！d(￣￣)

RxAndroid
✤ Reactive Extensions Android
✤ リアクティブプログラミングをするためのライブラリ
✤ 同期処理、非同期処理、遅延実行…
✤ RxJavaを内包しAndroidで利用するための機能を追加
✤ Android Handler / Thread 処理

RxAndroid…他にも
✤ RxLifecycle
✤ RxBinding
✤ SqlBrite
✤ Android-ReactiveLocation
✤ rx-preferences

RxAndroid
✤ AndroidSchedulers
✤ HandlerSchedulers

Gradle の準備
// RxJava 
compile 'io.reactivex:rxjava:1.0.15' 
 
// RXAndroid 
compile 'io.reactivex:rxandroid:1.0.1'

Android Schedulers
request().subscribeOn(Schedulers.newThread()) 
.observeOn(AndroidSchedulers.mainThread()) 
.subscribe(new Observer<String>() { 
@Override 
// network completed
// main thread 
} 
 
@Override 
// network error 
// main thread 
} 
 
@Override 
// main thread 
} 
});

Handler Schedulers
Handler handler = new Handler(); 
request().subscribeOn(Schedulers.newThread()) 
.observeOn(HandlerScheduler.from(handler)) 
.subscribe(new Observer<String>() { 
@Override 
// handler thread 
} 
 
@Override 
// network error 
} 
 
@Override 
} 
});

RxJava わかってきたところで

Retrofit
✤ A Type safe HTTP client for Android and Java
✤ Android の為の REST 通信を手軽に実装できる!?
✤ Retroﬁt 2.0.0-bata2 を利用します。

Retrofit
✤ 基本的な使い方
✤ 非同期処理
✤ 同期処理
✤ RxJava を組み込んでみる

Gradle の準備
// Retrofit 
compile ‘com.squareup.retrofit:retrofit:2.0.0-beta2'
// gson 
compile ‘com.google.code.gson:gson:2.4'
// Converter Gson 
compile 'com.squareup.retrofit:converter-gson:2.0.0-beta2'

Proguard の準備
# Retrofit Proguard 
-dontwarn retrofit.** 
-keep class retrofit.** { *; } 
-keepattributes Signature 
-keepattributes Exceptions

Model Class の作成
public class SignIn { 
@SerializedName("access_token") 
public final String accessToken; 
 
@SerializedName("user_id") 
public final int userId; 
 
@SerializedName("group_id") 
public final int group_id; 
 
public SignIn(String accessToken, int userId, int group_id) { 
this.accessToken = accessToken; 
this.userId = userId; 
this.group_id = group_id; 
} 
}

Service Interface 作成
public interface UsersService { 
@FormUrlEncoded 
@POST("/v3/users/sign_in") 
Call<SignIn> signIn(@Field("email") String email, @Field("password") String password); 
}

非同期処理
// Gson Converter Factory 
GsonConverterFactory factory = GsonConverterFactory.create(new Gson()); 
 
// Retrofit 
Retrofit retrofit = new Retrofit.Builder() 
.baseUrl(baseUrl) 
.addConverterFactory(factory) 
.build(); 
 
// Users Service 
UsersService usersService = retrofit.create(UsersService.class); 
 
// Call 
Call<SignIn> call = usersService.signIn(Email, Password); 
call.enqueue(new Callback<SignIn>() { 
@Override 
public void onResponse(Response<SignIn> response, Retrofit retrofit) { 
// network success 
} 
 
@Override 
public void onFailure(Throwable t) { 
// network error 
} 
});

同期処理
 
// Retrofit 
.build(); 
 
// Users Service 
 
// Call 
Call<SignIn> call = usersService.signIn(Email, Password); 
try { 
Response<SignIn> response = call.execute(); 
} catch (IOException e) { 
e.printStackTrace(); 
}

Service Interface（RxJava版）
public interface UsersService { 
@FormUrlEncoded 
@POST("/v3/users/sign_in") 
Observable<SignIn> signIn(@Field("email") String email, @Field("password") String password); 
}

非同期処理（RxJava版）
 
// RxJava Call Adapter 
RxJavaCallAdapterFactory adapterFactory = RxJavaCallAdapterFactory.create(); 
 
// Retrofit 
.addCallAdapterFactory(adapterFactory) 
.build(); 
 
// Users Service 
 
// User Service 
Observable<SignIn> observable = usersService.signIn(Email, Password); 
observable.subscribeOn(Schedulers.newThread()) 
.observeOn(AndroidSchedulers.mainThread()) 
.subscribe(new Observer<SignIn>() { 
@Override 
} 
 
@Override 
// network error 
} 
 
@Override 
public void onNext(SignIn signIn) { 
} 
});

同期処理（RxJava版）
 
// RxJava Call Adapter 
RxJavaCallAdapterFactory adapterFactory = RxJavaCallAdapterFactory.create(); 
 
// Retrofit 
.addCallAdapterFactory(adapterFactory) 
.build(); 
 
// Users Service 
 
// Call 
Observable<SignIn> observable = usersService.signIn(Email, Password); 
SignIn signIn = observable 
.subscribeOn(Schedulers.newThread()) 
.toBlocking() 
.single(); 
 
if (signIn == null) { 
// network error 
} else { 
}

Retrofit でハマったこと

Retrofit でハマったこと
✤ Twitter Kit では Retrofit 1.8 を使っている
✤ Retrofit 1.8-1.9 と Retrofit 2.0 で設定の変更
✤ Retrofit 2.0 では、RxJava の Call Adapter が必要

ありがとうございました。

Rx java x retrofit

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