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:
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<?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:

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<?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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