MVVMLight

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一个工具包帮助构建 Android MVVM 应用

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工具介绍

一个工具包帮助构建 Android MVVM 应用

MVVM Light Toolkit

A toolkit help to build Android MVVM Application，We have more attributes for Data Binding of View(like Uri for ImageView) ,we create some command for deal with event( like click of Button),also have a global message pipe to communicate with other ViewModel. ##Download##

groovy

 compile 'com.kelin.mvvmlight:library:1.0.0'

requires at least android gradle plugin 1.5.0.

##Usage##

####中文文档：MVVM Light Toolkit使用指南#### ####引申阅读：如何构建Android MVVM应用程序####

###Data Binding###

Binding URI to the ImageView with bind:uri will make it loading bitmap from URI and render to ImageView automatically.

xml

<ImageView
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:layout_alignParentRight="true"
  bind:uri="@{viewModel.imageUrl}"
  bind:placeholderImageRes="@{R.drawable.ic_launcher}"/>

Fresco.initialize(this) is require,because of loading image use Fresco default).

java

  public class MyApp extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        Fresco.initialize(this);
   }

Example

AdapterView like ListView、RecyclerView 、ViewPager is convenient, bind it to the collection view with app:items and app:itemView,You should use an ObservableList to automatically update your view based on list changes.

xml

 <android.support.v7.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    bind:itemView="@{viewModel.itemView}"
    bind:items="@{viewModel.itemViewModel}"
    bind:layoutManager="@{LayoutManagers.linear()}"

In ViewModel define itemViewModel and itemView

java

 public final ObservableList<ViewModel> itemViewModel = new ObservableArrayList<>();
 public final ItemView itemView = ItemView.of(BR.viewModel, R.layout.layoutitem_list_view);

Adapter，ViewHolder ..is Not Required:

Example

Other attributes supported:

ImageView

xml

<attr name="uri" />

<attr name="request_width" format="integer" />

<attr name="request_height" format="integer" />
<attr name="placeholderImageRes" format="reference|color" />

ListView、ViewPager、RecyclerView

xml


<attr name="itemView" />

<attr name="items" />

<attr name="adapter" />
<attr name="dropDownItemView" format="reference" />
<attr name="itemIds" format="reference" />
<attr name="itemIsEnabled" format="reference" />

<attr name="pageTitles" format="reference" />

ViewGroup

xml


<attr name="itemView" />

<attr name="viewModels" format="reference" />

EditText

xml


<attr name="requestFocus"  format="boolean" />

SimpleDraweeView
xml
```
<attr name="uri" />
```
WebView
xml
```
<attr name="render" format="string" />
```

###Command Binding###

When RecyclerView scroll to end of list,we have onLoadMoreCommand to deal with event.

xml

   <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        bind:onLoadMoreCommand="@{viewModel.loadMoreCommand}"/>

In ViewModel define a ReplyCommand field to deal with this event.

java

   public final ReplyCommand<Integer> loadMoreCommand = new ReplyCommand<>(
      (count) -> {
          /*count: count of list items*/
           int page=count / LIMIT +1;
           loadData(page)
      });

Example

Deal with click event of View is more convenient:

xml

 <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            bind:clickCommand="@{viewModel.btnClickCommand}" />

In ViewModel define a ReplyCommand btnClickCommand will be call when click event occur.

java

 public ReplyCommand btnClickCommand = new ReplyCommand(() -> {
       do something...
    });

Example

onRefreshCommand to SwipeRefreshLayout

More command binding is supported:

View

xml


<attr name="clickCommand" format="reference" />

<attr name="onFocusChangeCommand" format="reference" />

<attr name="onTouchCommand" />

ListView、RecyclerView

xml


<attr name="onScrollStateChangedCommand" />

<attr name="onScrollChangeCommand" />

<attr name="onLoadMoreCommand" format="reference" />

ViewPager

xml


<attr name="onPageScrolledCommand" format="reference" />

<attr name="onPageSelectedCommand" format="reference" />

<attr name="onPageScrollStateChangedCommand" format="reference" />

EditText

xml


<attr name="beforeTextChangedCommand" format="reference" />

<attr name="onTextChangedCommand" format="reference" />

<attr name="afterTextChangedCommand" format="reference" />

ImageView

xml

 
 <attr name="onSuccessCommand" format="reference" />
 
 <attr name="onFailureCommand" format="reference" />

ScrollView、NestedScrollView

xml


<attr name="onScrollChangeCommand" />

<attr name="onScrollChangeCommand" />

SwipeRefreshLayout

xml


<attr name="onRefreshCommand" format="reference" />

###Messenger###

simplifies the communication between ViewModel(major) or any components

Example

global message broadcast without deliver data

java

/* TOKEN: like Action of broadcast with who register this token will be notified when event occur.*/
  Messenger.Default().sendNoMsg(TOKEN);
  /*context: it usually to be a activity ，this parameter is represent to
          a receiver which is mean for convenient when unregister message.
  TOKEN: like Action of broadcast with who register this token will be notified when event occur.
  (data)->{ }:Action to deal with event. */
  Messenger.Default().register(context, TOKEN, () -> { });

global message broadcast (carry data to receiver)

java

 Messenger.getDefault().send(data, TOKEN)
 /*context:
 TOKEN:
 Data.class: type of deliver data.
(data)->{ }: function to deal with event which has data is deliver by sender.*/
 Messenger.getDefault().register(context, TOKEN, Data.class, (data) -> { });

send to specify target (inactive)

java

Messenger.getDefault().sendToTarget(T message, R target)
Messenger.getDefault().sendNoMsgToTargetWithToken(Object token,R target)
Messenger.getDefault().sendNoMsgToTarget(Object target)

cancel register

java

 Messenger.getDefault().unregister(Object recipient)"
 /* Usually Usage*/
 @Override
 protected void onDestroy() {
         super.onDestroy();
         Messenger.getDefault().unregister(this);
  }