RemoteViews(1)API简介

search4remoteview.jpg

1. RemoteViews

RemoteViews 不是View

public class RemoteViews
extends Object implements Parcelable, LayoutInflater.Filter

java.lang.Object
   ↳    android.widget.RemoteViews

A class that describes a view hierarchy that can be displayed in another process. The hierarchy is inflated from a layout resource file, and this class provides some basic operations for modifying the content of the inflated hierarchy.

RemoteViews 描述了一个可以在其他进程显示的View层级（View层级是通过加载布局文件得到），并提供了一些修改这个View层级的基础操作（setXxx方法）。

RemoteViews 仅支持有限的layout和widget，而且不支持这些 layout和widget的子类(这里说的layout泛指容器)

layout	widget
AdapterViewFlipper	AnalogClock
FrameLayout	Chronometer
GridLayout	ImageButton
GridView	ImageView
LinearLayout	ProgressBar
RelativeLayout	TextClock
StackView	TextView
ViewFlipper	Button
ListView

2. RemoteViews.RemoteView

public static abstract @interface RemoteViews.RemoteView
implements Annotation

android.widget.RemoteViews.RemoteView

This annotation indicates that a subclass of View is allowed to be used with the RemoteViews mechanism

就是个注解，来标注可以和 RemoteViews 一起用的View

TextView源码

TextView.jpg

SeekBar源码

SeekBar.jpg

3. RemoteViewsService

public abstract class RemoteViewsService
extends Service

java.lang.Object
   ↳    android.content.Context
       ↳    android.content.ContextWrapper
           ↳    android.app.Service
               ↳    android.widget.RemoteViewsService

The service to be connected to for a remote adapter to request RemoteViews. Users should extend the RemoteViewsService to provide the appropriate RemoteViewsFactory's used to populate the remote collection view (ListView, GridView, etc).

它继承Service,用来为RemoteViews中的容器View(例如：ListView,GridView,etc)提供adapter适配器。

public abstract RemoteViewsService.RemoteViewsFactory onGetViewFactory (Intent intent)

1. RemoteViews 调用 setRemoteAdapter(int viewId, Intent intent)
2. 相当于调用AbsListView.setRemoteViewsAdapter(Intent) [ListView,GridView是AbsListView的直接子类]
3. 这个Intent是用来指定RemoteViewsService的

4. 相关数据操作放在RemoteViewsService onGetViewFactory()方法返回的RemoteViewsFactor中

   
   setRemoteViewsAdapter.jpg

4. RemoteViewsFactory

public static interface RemoteViewsService.RemoteViewsFactory

android.widget.RemoteViewsService.RemoteViewsFactory

An interface for an adapter between a remote collection view (ListView, GridView, etc) and the underlying data for that view. The implementor is responsible for making a RemoteView for each item in the data set. This interface is a thin wrapper around Adapter.

用来为RemoteViews中容器View与数据之间适配的接口，接口的实现类需要为数据集中的每一条数据提供一个RemoteViews 。

与Adapter中一样含义方法

getCount()
getViewTypeCount()
hasStableIds()

abstract RemoteViews getLoadingView()
用来在getViewAt(int position)方法返回真正的 RemoteViews 之前提供一个loading View

abstract RemoteViews getViewAt(int position)
返回指定位置的 RemoteViews

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onCreate()
RemoteViewsFactory 第一次被创建时调用

onDestroy()
当最后一个"RemoteViewsAdapter"与RemoteViewsFactory 解绑时调用

onDataSetChanged()
通知数据集改变，更新视图

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