Android高手進階教程(二)之----Android Launcher抽屜類SlidingDrawer的使用!

最近在研究Lanucher ,看了源碼，發現了SlidingDrawer 這個類，也就是所謂的"抽屜"類。它的用法很簡單，要包括handle ,和content . handle 就是當你點擊它的時候，content 要麼抽抽屜要麼關抽屜。別的不多說了，具體步驟如下. 1.新建Android 工程,命名為SlidingDrawer . 2.准備素材,在這裡我的圖標是用Launcher2 裡面的圖標，放在drawable-hdpi 文件夾目錄結構如下:   3.設置main.xml 布局:代碼如下: view plaincopy to clipboardprint?
 

<?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.設置handle 圖標的樣式，在drawable 裡添加handle.xml ,代碼如下:

view plaincopy to clipboardprint?  
<?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.運行之。將會得到如下效果:     的比較簡單呵呵，如果想深入了解，大家看Launcher 源碼吧！    

本文出自 “Android_Tutor” 博客，請務必保留此出處http://weizhulin.blog.51cto.com/1556324/311461