RxJava With retrolambda

RxJava with retrolambda
introduction
Andyang@2015/12/26

lifecycle memory leak
callback hell
error handling
lambda

Retrolambda
Android N Java8
retrolambda library support lambda
jdk8
support java6/7
android support java8  
gradle

retrolambda setting on
android studio
apply plugin: 'me.tatarka.retrolambda'
buildscript { 
repositories { 
mavenCentral() 
} 
 
dependencies { 
classpath 'me.tatarka:gradle-retrolambda:3.2.4' 
} 
}
compileOptions { 
sourceCompatibility JavaVersion.VERSION_1_8 
targetCompatibility JavaVersion.VERSION_1_8 
}

lambda#1
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
System.out.println("click")
}
});
// lambda
button.setOnClickListener(view -> System.out.println("click"));

lambda#2
input -> body
view -> System.out.println("click")

lambda#3
intput
void
() -> body
x -> System.out.println(x)
(x, y) -> x + y;
(int x, int y) -> x + y;

lambda#4
() -> {}
{}
(x, y) -> x + y;
(x, y) -> x + y

lambda#5
(x, y) ->{
x * x;
y * y;
}
(x, y) ->{
x * x;
y * y;
return x + y;
}

lambda#6
Object reference
view.setOnClickListener(v -> v.setVisibility(View.GONE));
view.setOnClickListener(this::viewGone);
private void viewGone(View v){ 
v.setVisibility(View.GONE); 
}

RxJava setting on
android studio
RxAnroid
compile ‘io.reactivex:rxandroid:1.1.0'
RxLifecycle
compile 'com.trello:rxlifecycle:0.4.0' 
compile 'com.trello:rxlifecycle-components:
0.4.0'

AsyncTask
class MyTask extends AsyncTask<String, Integer, String>
{ 
 
@Override 
protected String doInBackground(String... params) { 
return null; 
} 
 
@Override 
protected void onPostExecute(String s) { 
super.onPostExecute(s); 
} 
}

RxJava
//Observable
api.getPets()
//Scheduler  
.subscribeOn(Schedulers.newThread()) 
.observeOn(AndroidSchedulers.mainThread())
//Observer 
.subscribe();

Observable
Observable.create(subscriber -> { 
subscriber.onNext(""); 
subscriber.onCompleted(); 
subscriber.onError(null); 
});

api.getPets() 
.compose(bindToLifecycle()) 
.map(petsResponse ->
petsResponse.getResult().getResults()) 
.retry(this::networkRetry) 
.subscribeOn(Schedulers.newThread()) 
.observeOn(AndroidSchedulers.mainThread()) 
.finallyDo(dialog::dismiss) 
.subscribe(adapter::setPets, this::showErrorLog,
this::onComplete);
private boolean networkRetry(int times, Throwable throwable)
{ 
RetrofitError retrofitError = (RetrofitError) throwable; 
return retrofitError.getKind() ==
RetrofitError.Kind.NETWORK || times < 3; 
}

sample code
1.https://github.com/bng86/RxJavaWithRetrolambdaSample
1.https://www.youtube.com/watch?v=k3D0cWyNno4
2.https://github.com/kaushikgopal/RxJava-Android-
Samples
3.https://mcxiaoke.gitbooks.io/rxdocs/content/Intro.html

RxJava With retrolambda

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