Epoxy 介紹

Epoxy 介紹
黃千碩 (Kros)
oSolve, Ltd./打⼯工趣
Mobile App Developer

Outline
• What is Epoxy
• When to use
• How to use
• Detail
• Future
• Summary

What is Epoxy
• Airbnb 開源專案
• ⽤用來來取代傳統 Adapter
• 可建立複雜的 RecyclerView Adapter
• 內建儲存 view state, ⾃自動 diff

When to use
• 有三種⽅方法實作
• ScrollView
• Adapter with view type
• Epoxy Controller

ScrollView
• 需在 XML 裡⾯面設定
• Slow
• 如果要動態改變/增減欄欄位，情況複雜
• Animation 困難

Adapter with view type
@Override 
public int getItemViewType(int position) { 
if (0 == position) { 
return TYPE_1; 
} else if (1 == position) { 
return TYPE_2; 
} else { 
return TYPE_3; 
} 
}
@Override 
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) { 
switch (viewType) { 
case TYPE_1:
case TYPE_2:
case TYPE_3:
}
}

Epoxy Controller
• The EpoxyController encourages usage similar to the popular
Model-View-ViewModel and Model-View-Intent patterns.
• 類似現在的 Model-View-ViewMode 改念念，把建立 RecyclerView
Items 的邏輯放在 Controller 裡⾯面

Epoxy Controller
• 所⾒見見即所得

Epoxy Controller
@Override 
protected void buildModels() { 
add(new AvatarItemViewModel_()); 
add(new BannerItemViewModel_()); 
add(new SettingsItemViewModel_()); 
add(new SettingsItemViewModel_());
}
在 EpoxyController 中使⽤用的⽅方式

Epoxy Controller
@Override 
}

Epoxy Controller
@Override 
add(new BannerItemViewModel_());
}

Epoxy Controller
@Override 
}
加入順序 == 顯⽰示順序

Epoxy Controller
@Override 
add(new AdItemViewModel_());
}
新增 Item 非常容易易

How to use
• 使⽤用三步驟
• 建立 EpoxyController
• 建立 EpoxyModel
• 設定 RecyclerView 的 Adapter

How
EpoxyController
⼿手動建立

How
EpoxyControllerAdapter
⾃自動產⽣生
⼿手動建立

How
RecyclerView EpoxyControllerAdapter
⾃自動產⽣生使⽤用
⼿手動建立

EpoxyModel
EpoxyModel
View
EpoxyModel 中
指定需顯⽰示的 View

EpoxyModel
EpoxyModel
View
Data
View 可以設定
需顯⽰示的資料

EpoxyModel
EpoxyModel
View
Data Data
Data Data
可設定多個資料

EpoxyModel
EpoxyControllerEpoxyModel
View
Data Data
Data Data

EpoxyModel
EpoxyController
在 EpoxyController 中
建立所需的 EpoxyModel

How
RecyclerView Adapter
⾃自動產⽣生使⽤用
⼿手動建立
EpoxyControl

Detail
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
// ... 
setUpController(); 
setUpRecyclerView(); 
}

Detail
 
private void setUpController() {
// ... 
controller = new MyEpoxyController();
// ...
}
// 繼承 EpoxyController
public class MyEpoxyController extends EpoxyController {
}

Detail
 
private void setUpRecyclerView() {
// ... 
recyclerView.setAdapter(controller.getAdapter());
// ... 
}

Detail
• 如何更更新資料？

Detail
 
private void updateController(Data data) {
// ... 
controller.setData(data);
// ... 
}

Detail
• Controller 裡⾯面要做什什麼？
• 加入 EpoxyModel

Epoxy Model
• Epoxy uses EpoxyModel objects to know which views to display
and how to bind data to them. This is similar to the popular
ViewModel pattern. You should subclass EpoxyModel to specify
what layout your model uses and how to bind data to that view.
• EpoxyModel 裡設定 View 為何，需顯⽰示的 Data 為何，有點像現在的
ViewModel 概念念

Create EpoxyModel
• 定義 Model
• 定義 View
• 定義 Property (Data)

Create EpoxyModel
• ⼿手動建立
• ⾃自動建立 (透過 Annotation)

View Annotations
• 建立 View
• 設定 Annotation
• 設定 Property (為了了 equals and hashCode)

View Annotations
• 建立 View
• 設定 Annotation
• 設定 Property (為了了 equals and hashCode)
• 就會⾃自動產⽣生 EpoxyModel 了了！

SettingsItemViewModel
@Override 
}

public class SettingsItemView extends LinearLayout { 
@BindView(R.id.titleTextView) TextView titleTextView; 
 
public SettingsItemView(Context context, @Nullable AttributeSet attrs) { 
super(context, attrs); 
init(); 
} 
 
private void init() { 
inflate(getContext(), R.layout.view_settings_item, this); 
ButterKnife.bind(this); 
} 
 
 
}

@ModelView(defaultLayout = R.layout.model_settings_item_view) 
 
init(); 
} 
 
} 
 
 
}

 
init(); 
} 
 
} 
 
 
}
指定 Model 要 Inﬂate 的 View 為何

R.layout.model_settings_item_view：

R.layout.model_settings_item_view：
<?xml version="1.0" encoding="utf-8"?> 
<com.example.epoxydemo.view.SettingsItemView 
xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height=“wrap_content"/>
在 model_settings_item_view 中指定要使⽤用
SettingsItemView

 
init(); 
} 
 
} 
 
@ModelProp 
public void setTitle(@StringRes int resId) { 
titleTextView.setText(resId); 
} 
 
@ModelProp(options = Option.DoNotHash) 
public void setClickListener(@Nullable OnClickListener clickListener) { 
this.setOnClickListener(clickListener); 
} 
}

 
init(); 
} 
 
} 
 
@ModelProp 
} 
 
} 
}
設定 Property
讓 View 顯⽰示對應的資料

 
init(); 
} 
 
} 
 
@ModelProp 
} 
 
} 
}
設定 ClickListener

 
init(); 
} 
 
} 
 
@ModelProp 
} 
 
} 
} Interface 沒有 equal and hash
所以使⽤用 Option.DoNotHash 標記

Integration
• 在 EpoxyController 中設定需要哪些 EpoxyModels
• 有兩兩種⽅方式可以建立 EpoxyModel
• ⼿手動建立
• ⾃自動建立 (AutoModel Annotation)

Using EpoxyModel
public class SimpleController extends EpoxyController {
 
@Override 
add(new SettingsItemViewModel_() 
.id(3) 
.title(R.string.settings_1) 
.clickListener(new OnClickListener() { 
@Override 
public void onClick(View v) { 
 
} 
}) 
); 
}
}

Using EpoxyModel
 
@Override 
.id(3) 
@Override 
 
} 
}) 
); 
}
}
⼿手動 new ⼀一個 EpoxyModel

Using EpoxyModel
 
@Override 
.id(3) 
@Override 
 
} 
}) 
); 
}
}
⾃自動產⽣生的 EpoxyModel

Using EpoxyModel
 
@Override 
.id(3) 
@Override 
 
} 
}) 
); 
}
}
透過 EpoxyController 的 method
加入到 Controller 裡

Using EpoxyModel
 
@Override 
.id(3) 
@Override 
 
} 
}) 
); 
}
}
若若是⼿手動建立
要設定 Unique ID

Using EpoxyModel
 
@Override 
.id(3) 
@Override 
 
} 
}) 
); 
}
}
剛剛設定的 Properties

Using EpoxyModel
 
@Override 
 
} 
}

Using EpoxyModel
@AutoModel SettingsItemViewModel_ settingsItemViewModel1;
 
@Override 
 
} 
}
使⽤用 Annotation

Using EpoxyModel
 
@Override 
settingsItemViewModel1 
@Override 
 
} 
}) 
.addTo(this); 
} 
}

Using EpoxyModel
 
@Override 
@Override 
 
} 
}) 
.addTo(this); 
} 
}
透過 Annotation 建立的 EpoxyModel
會⾃自動設定 Unique ID

Using EpoxyModel
 
@Override 
@Override 
 
} 
}) 
.addTo(this); 
} 
}
加入到 Controller 裡

EpoxyViewHolder
• 如果是單純重複的 list？

EpoxyViewHolder
• 如果是單純重複的 list？
• 可使⽤用 EpoxyViewHolder

public class ListController extends TypedEpoxyController<List<Comment>> { 
 
 
 
 
@Override 
protected void buildModels(List<Comment> data) { 
 
 
} 
}

 
@AutoModel HeaderItemViewModel_ headerItemViewModel; 
@AutoModel FooterItemViewModel_ footerItemViewModel; 
 
@Override 
 
headerItemViewModel 
.title(R.string.header_1) 
.addTo(this); 
 
 
 
footerItemViewModel 
.title(R.string.footer_1) 
.addTo(this); 
} 
}

 
@AutoModel FooterItemViewModel_ footerItemViewModel; 
 
@Override 
 
.addTo(this); 
 
for (Comment comment : data) { 
new CommentItemModel_() 
.id(comment.getId()) 
.comment(comment.getComment()) 
.clickListener(//...) 
}) 
.addTo(this); 
} 
 
footerItemViewModel 
.title(R.string.footer_1) 
.addTo(this); 
} 
}

Using EpoxyHolder
@EpoxyModelClass(layout = R.layout.model_comment_item_view) 
public abstract class CommentItemModel extends EpoxyModelWithHolder<CommentItemHolder> { 
@EpoxyAttribute String comment; 
@EpoxyAttribute(DoNotHash) OnClickListener clickListener; 
 
@Override 
public void bind(CommentItemHolder holder) { 
holder.itemView.setOnClickListener(clickListener); 
holder.commentTextView.setText(comment); 
} 
 
@Override 
public void unbind(CommentItemHolder holder) { 
holder.itemView.setOnClickListener(null); 
} 
 
public static class CommentItemHolder extends BaseEpoxyHolder { 
@BindView(R.id.itemView) View itemView; 
@BindView(R.id.commentTextView) TextView commentTextView; 
} 
}

Using EpoxyHolder
 
@Override 
} 
 
@Override 
} 
 
} 
}
繼承 EpoxyModelWithHolder
繼承 BaseEpoxyHolder
https://github.com/airbnb/epoxy/wiki/Epoxy-Models#view-holders

Using EpoxyHolder
 
@Override 
} 
 
@Override 
} 
 
} 
}
類似 ViewHolder 的 lifecycle

 
@AutoModel FooterItemViewModel_ footerItemViewModel;
 
@Override 
 
.addTo(this); 
 
}) 
.addTo(this); 
} 
 
loadMoreViewModel 
.addTo(true, this); 
} 
}

 
 
@Override 
 
.addTo(this); 
 
}) 
.addTo(this); 
} 
 
.addTo(true, this); 
} 
}
Add with condition,
可以設定條件(true/false)
決定是否要加入到 Controller

 
 
@Override 
 
.addTo(this); 
 
}) 
.addTo(this); 
} 
 
.addTo(false, this); 
} 
}

Other Features
• EpoxyModelGroup
• Saving View state
• Payloads
• Data binding layouts
• Litho Components
• Kotlin Support
• Grid Suport

Future
• Sticky Header, Footer, Decoration

Summary
• 若若 RecyclerView 有兩兩種以上的 view type，可以考慮⽤用 Epoxy
• 想要動態增減 RecyclerView 內容，可以考慮⽤用 Epoxy
• ScrollView 太長，可以考慮⽤用 Epoxy
• 需要 Header, Footer，可以考慮⽤用 Epoxy
• 不想⾃自⼰己實作 diff, save state，可以考慮⽤用 Epoxy

Demo Project
• https://github.com/ch8908/EpoxyDemo

Reference
• Epoxy: Airbnb’s View Architecture on Android 
https://medium.com/airbnb-engineering/epoxy-airbnbs-view-
architecture-on-android-c3e1af150394
• Epoxy Github Wiki 
https://github.com/airbnb/epoxy/wiki

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