【Android】抽屉控件 SlidingDrawer 的简单示例


【0】先看一段官方描述：

public class

SlidingDrawer

extends ViewGroup
java.lang.Object
   ↳ Android.view.View
     ↳ android.view.ViewGroup
       ↳ android.widget.SlidingDrawer

Class Overview

SlidingDrawer hides content out of the screen and allows the user to drag a handle to bring the content on screen. SlidingDrawer can be used vertically or horizontally. A special widget composed of two children views: the handle, that the users drags, and the content, attached to the handle and dragged with it. SlidingDrawer should be used as an overlay inside layouts. This means SlidingDrawer should only be used inside of a FrameLayout or a RelativeLayout for instance. The size of the SlidingDrawer defines how much space the content will occupy once slid out so SlidingDrawer should usually use match_parent for both its dimensions. Inside an XML layout, SlidingDrawer must define the id of the handle and of the content:

[html]
  1. <SlidingDrawer  
  2.     android:id="@+id/drawer"  
  3.     android:layout_width="match_parent"  
  4.     android:layout_height="match_parent"  
  5.   
  6.     android:handle="@+id/handle"  
  7.     android:content="@+id/content">  
  8.   
  9.     <ImageView  
  10.         android:id="@id/handle"  
  11.         android:layout_width="88dip"  
  12.         android:layout_height="44dip" />  
  13.   
  14.     <GridView  
  15.         android:id="@id/content"  
  16.         android:layout_width="match_parent"  
  17.         android:layout_height="match_parent" />  
  18.   
  19. </SlidingDrawer>  

【1】简单的说就是：

SlidingDrawer是一个可以实现抽取式显示的控件，可以垂直，水平拉取，每个抽屉都包含两个东西：一个是拉手（handle），一个是抽屉里面的东西（content），SlidingDrawer需要放置在另外的一个layout之上，这意味着SlidingDrawer只能放置在 FrameLayout or a RelativeLayout里面。SlidingDrawer需要设置宽高为match_parent，而且在SlidingDrawer里面必须设置handle与content（显然，不然缺少任何一个都不叫“抽屉”啊）


【2】一些重要的属性与方法：


XML Attributes
Attribute Name Related Method Description
android:allowSingleTap   Indicates whether the drawer can be opened/closed by a single tap on the handle.
指示是否可以通过handle打开或关闭
android:animateOnClick   Indicates whether the drawer should be opened/closed with an animation when the user clicks the handle.
指示是否当使用者按下手柄打开/关闭时是否该有一个动画
android:bottomOffset   Extra offset for the handle at the bottom of the SlidingDrawer. 
android:content   Identifier for the child that represents the drawer's content.指定抽屉的内容
android:handle   Identifier for the child that represents the drawer's handle.指定把手handle
android:orientation   Orientation of the SlidingDrawer. 水平还是垂直
android:topOffset   Extra offset for the handle at the top of the SlidingDrawer.

Public Methods
void animateClose() Closes the drawer with an animation.关闭动画
void animateOpen() Opens the drawer with an animation.打开动画
void animateToggle() Toggles the drawer open and close with an animation.
void close() Closes the drawer immediately.
View getContent() Returns the content of the drawer.获取抽屉的内容
View getHandle() Returns the handle of the drawer.获取抽屉的把手
boolean isMoving() Indicates whether the drawer is scrolling or flinging.判断是否在移动
boolean isOpened() Indicates whether the drawer is currently fully opened.是否打开
void lock() Locks the SlidingDrawer so that touch events are ignores.锁死抽屉
boolean onInterceptTouchEvent(MotionEvent event) Implement this method to intercept all touch screen motion events.
boolean onTouchEvent(MotionEvent event) Implement this method to handle touch screen motion events.
void open() Opens the drawer immediately.打开抽屉
void setOnDrawerCloseListener(SlidingDrawer.OnDrawerCloseListener onDrawerCloseListener) Sets the listener that receives a notification when the drawer becomes close.设置关闭抽屉监听
void setOnDrawerOpenListener(SlidingDrawer.OnDrawerOpenListener onDrawerOpenListener) Sets the listener that receives a notification when the drawer becomes open.设置打开抽屉监听
void setOnDrawerScrollListener(SlidingDrawer.OnDrawerScrollListener onDrawerScrollListener) Sets the listener that receives a notification when the drawer starts or ends a scroll.设置拉动抽屉监听
void toggle() Toggles the drawer open and close.切换打开和关闭的抽屉。
void unlock() Unlocks the SlidingDrawer so that touch events are processed.解锁

【4】Demo演示：

[html]
  1. <?xml version="1.0" encoding="utf-8"?>  
  2. <merge   
  3.     xmlns:android="http://schemas.android.com/apk/res/android"  
  4.     android:layout_width="match_parent"  
  5.     android:layout_height="match_parent" >  
  6.     <ImageView   
  7.         android:id="@+id/OrginView"  
  8.         android:layout_width="wrap_content"  
  9.         android:layout_height="wrap_content"  
  10.         android:src="@drawable/orginview"  
  11.         android:contentDescription="@string/image_org"/>     
  12.     <SlidingDrawer  
  13.         android:id="@+id/SlidingDrawer"  
  14.         android:layout_width="match_parent"  
  15.         android:layout_height="match_parent"  
  16.         android:handle="@+id/handle"  
  17.         android:content="@+id/content" >  
  18.   
  19.         <ImageView   
  20.             android:id="@id/handle"  
  21.              android:layout_width="wrap_content"  
  22.              android:layout_height="wrap_content"  
  23.              android:src="@drawable/handleview"  
  24.              android:contentDescription="@string/image_handle" />  
  25.         <ImageView   
  26.             android:id="@id/content"  
  27.              android:layout_width="wrap_content"  
  28.              android:layout_height="wrap_content"  
  29.              android:src="@drawable/contentview"  
  30.              android:contentDescription="@string/image_content" />  
  31.     </SlidingDrawer>  
  32. </merge>  

这里使用到了<merge>标签，详细使用方法请看;http://developer.android.com/resources/articles/layout-tricks-merge.html

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