优雅编码框架简介一

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Retrolambda

Lambda表达式是一种可用于创建委托或表达式目录树类型的匿名函数。

AndroidStudio配置：
build.gradle(Project)
buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'me.tatarka:gradle-retrolambda:3.3.1'
    }
}

build.gradle(Module)
apply plugin: 'com.android.application' //or apply plugin: 'java'
apply plugin: 'me.tatarka.retrolambda'

android {
   compileOptions {
       sourceCompatibility JavaVersion.VERSION_1_8
       targetCompatibility JavaVersion.VERSION_1_8
   }
}

语法：
input -> body

input类型：
无参：void() -> body
单参：x -> body
多参：(x, y) -> body
显型：(int x, int y) -> body

body类型：
空体：input -> {}
单行：input -> x + y
多行无返回：input -> {x++; y++;}
多行有返回：input -> {x++; y++; return x + y;}

Butterknife

Field and method binding for Android views which uses annotation processing to generate boilerplate code for you.

AndroidStudio配置：
build.gradle(Module)
compile 'com.jakewharton:butterknife:8.4.0'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.4.0'
或则：Ctrl + Alt + Shift + S

使用方法：
Activity: ButterKnife.bind(this);
Fragment: ButterKnife.bind(this, rootView);
private Unbinder mUnbinder; mUnbinder = ButterKnife.bind(this); mUnbinder.unbind();
注意：
1、方法不能为private or static
2、参数可选
3、setContentView()不能注解

绑定属性：
@BindView(R.id.tv_show_main)
TextView mShowView;
@Nullable @BindInt()
@BindFloat()
@BindBool()
@BindString()
@BindArray()
@BindDrawable()
@BindBitmap()
@BindColor()
@BindDimen()
@BindViews()

绑定方法：
@OnClick(R.id.submit)
public void submit(View view) {
   view.setText("Binded");
}
@OnTextChanged(value = R.id.test, callback = OnTextChanged.BEFORE_TEXT_CHANGED)
void beforeTextChanged(CharSequences s, int start, int count, int after) {
}

@BindViews({R.id.first_name, R.id.last_name})
List<EditText> nameViews;
ButterKnife.apply(nameViews, DISABLE);
ButterKnife.apply(nameViews, ENABLED, false);

static final ButterKnife.Action<View> DISABLE = new ButterKnife.Action<View>() {
@Override
public void apply(View view, int index) {
    view.setEnabled(false);
}
};
static final ButterKnife.Setter<View, Boolean> ENABLED = new ButterKnife.Setter<View, Boolean>() {
@Override
public void set(View view, Boolean value, int index) {
    view.setEnabled(value);
}
};
ButterKnife.apply(nameViews, View.ALPHA, 0.0f);

@Nullable @BindView(R.id.might_not_be_there) TextView mightNotBeThere;

@Optional @OnClick(R.id.maybe_missing) void onMaybeMissingClicked() {
// TODO ...
}

@OnItemSelected(R.id.list_view)
void onItemSelected(int position) {
// TODO ...
}

@OnItemSelected(value = R.id.maybe_missing, callback = NOTHING_SELECTED)
void onNothingSelected() {
// TODO ...
}

TextView firstName = ButterKnife.findById(view, R.id.first_name);

RxBinding

RxBinding是Rx中处理控件异步调用的方式, 也是由Square公司开发, Jake负责编写. 通过绑定组件, 异步获取事件, 并进行处理.
RxView.clicks(mShowView).subscribe(this::onShowClicked);
RxSnackbar.dismiss().subscribe();
RxTextView.textChanges().subscribe();

EventBus

EventBus是一款针对Android优化的发布/订阅事件总线。主要功能是替代Intent,Handler,BroadCast在Fragment，Activity，Service，线程之间传递消息.优点是开销小，代码更优雅。以及将发送者和接收者解耦。
EventBus.getDefault().register(this);
public void onEventMainThread(LocalEvent event);
EventBus.getDefault().unregister(this);
EventBus.getDefault().post(new LocalEvent("hello"));

onEvent() 发布消费同一线程
onEventMainThread() UI线程消费
onEventBackgoundThread() 子线程消费，不是UI线程才会创建
onEventAsync() 子线程消费，每次都创建

Publisher-post(Event)->EventBus-onEvent(Event)->Subscribers

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