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！