Android高手进阶教程(二)之 ----Android Launcher抽屉类SlidingDrawer的使用

最近在研究Lanucher ,看了源码,发现了SlidingDrawer 这个类,也就是所谓的"抽屉"类。它的用法很简单,要包括handle ,和content .

  handle 就是当你点击它的时候,content 要么抽抽屉要么关抽屉。别的不多说了,具体步骤如下.

  1.新建Android 工程,命名为SlidingDrawer .

  2.准备素材,在这里我的图标是用Launcher2 里面的图标,放在drawable-hdpi 文件夹目录结构如下:

  3.设置 main.xml 布局:代码如下:

<?xml version="1.0"  encoding="utf-8"?>     
<LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"    
     android:orientation="vertical"    
     android:layout_width="fill_parent"    
     android:layout_height="fill_parent"    
     android:background="#808080"    
    >     
<SlidingDrawer      
    android:id="@+id/slidingdrawer"    
     android:layout_width="fill_parent"    
     android:layout_height="fill_parent"    
     android:orientation="vertical"    
    android:handle="@+id/handle"     
    android:content="@+id/content">     
    <Button     
             android:id="@+id/handle"    
             android:layout_width="88dip"    
             android:layout_height="44dip"    
             android:background="@drawable/handle"    
        />     
     <LinearLayout     
        android:id="@+id/content"    
         android:layout_width="fill_parent"    
         android:layout_height="fill_parent"    
         android:background="#00ff00">     
        <Button     
             android:id="@+id/button"    
             android:layout_width="wrap_content"    
             android:layout_height="wrap_content"    
             android:text="Button"    
        />     
        <EditText      
            android:id="@+id/editText"    
             android:layout_width="fill_parent"    
             android:layout_height="wrap_content"    
        />     
     </LinearLayout>     
</SlidingDrawer>     
</LinearLayout>     
<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android" 
     android:orientation="vertical" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
    android:background="#808080"  
    > 
<SlidingDrawer 
     android:id="@+id/slidingdrawer" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
     android:orientation="vertical" 
    android:handle="@+id/handle" 
     android:content="@+id/content"> 
    <Button 
             android:id="@+id/handle" 
            android:layout_width="88dip" 
             android:layout_height="44dip" 
             android:background="@drawable/handle" 
        /> 
     <LinearLayout 
        android:id="@+id/content" 
         android:layout_width="fill_parent" 
         android:layout_height="fill_parent" 
         android:background="#00ff00"> 
        <Button 
             android:id="@+id/button" 
             android:layout_width="wrap_content" 
             android:layout_height="wrap_content" 
             android:text="Button" 
        /> 
        <EditText 
             android:id="@+id/editText" 
             android:layout_width="fill_parent" 
             android:layout_height="wrap_content" 
        /> 
     </LinearLayout> 
</SlidingDrawer> 
</LinearLayout>  

4.设置handle 图标的样式,在drawable 里添加handle.xml ,代码如下:

<?xml  version="1.0" encoding="utf-8"?>     
<selector  xmlns:android="http://schemas.android.com/apk/res/android">     
     <item android:state_window_focused="false"  android:state_enabled="true" android:drawable="@drawable/handle_normal"  />     
    <item android:state_pressed="true"  android:drawable="@drawable/handle_pressed" />     
    <item  android:state_focused="true" android:state_enabled="true"  android:drawable="@drawable/handle_focused" />     
    <item  android:state_enabled="true" android:drawable="@drawable/handle_normal"  />     
    <item android:state_focused="true"  android:drawable="@drawable/handle_focused" />     
</selector>     
<?xml version="1.0" encoding="utf-8"?> 
<selector  xmlns:android="http://schemas.android.com/apk/res/android"> 
     <item android:state_window_focused="false"  android:state_enabled="true" android:drawable="@drawable/handle_normal"  /> 
    <item android:state_pressed="true"  android:drawable="@drawable/handle_pressed" /> 
    <item  android:state_focused="true" android:state_enabled="true"  android:drawable="@drawable/handle_focused" /> 
    <item  android:state_enabled="true" android:drawable="@drawable/handle_normal"  /> 
    <item android:state_focused="true"  android:drawable="@drawable/handle_focused" /> 
</selector> 

   5.运行之。将会得到如下效果:

  的比较简单呵呵, 如果想深入了解,大家看Launcher 源码吧!

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