定义风格

鼠标风格定义位置：\frameworks\base\core\res\res\values\styles.xml

系统定义了两套鼠标的风格，一套是默认，一套是放大的图标的风格，在下面增加自己的鼠标风格图标

	<style name="BluePointer">
        <item name="pointerIconArrow">@drawable/pointer_arrow_blue_icon</item>		<!-- 默认指针的图标 -->
        <item name="pointerIconSpotHover">@drawable/pointer_spot_hover_icon</item>
        <item name="pointerIconSpotTouch">@drawable/pointer_spot_touch_icon</item>
        <item name="pointerIconSpotAnchor">@drawable/pointer_spot_anchor_icon</item>
        <item name="pointerIconHand">@drawable/pointer_hand_blue_icon</item>		<!-- 在按钮上手指的图标 -->
        <item name="pointerIconContextMenu">@drawable/pointer_context_menu_icon</item>
        <item name="pointerIconHelp">@drawable/pointer_help_icon</item>
        <item name="pointerIconWait">@drawable/pointer_wait_icon</item>
        <item name="pointerIconCell">@drawable/pointer_cell_icon</item>
        <item name="pointerIconCrosshair">@drawable/pointer_crosshair_icon</item>
        <item name="pointerIconText">@drawable/pointer_text_blue_icon</item>		<!-- 在文本框中I形的图标 -->
        <item name="pointerIconVerticalText">@drawable/pointer_vertical_text_icon</item>
        <item name="pointerIconAlias">@drawable/pointer_alias_icon</item>
        <item name="pointerIconCopy">@drawable/pointer_copy_icon</item>
        <item name="pointerIconAllScroll">@drawable/pointer_all_scroll_icon</item>
        <item name="pointerIconNodrop">@drawable/pointer_nodrop_icon</item>
        <item name="pointerIconHorizontalDoubleArrow">
            @drawable/pointer_horizontal_double_arrow_icon
        </item>
        <item name="pointerIconVerticalDoubleArrow">
            @drawable/pointer_vertical_double_arrow_icon
        </item>
        <item name="pointerIconTopRightDiagonalDoubleArrow">
            @drawable/pointer_top_right_diagonal_double_arrow_icon
        </item>
        <item name="pointerIconTopLeftDiagonalDoubleArrow">
            @drawable/pointer_top_left_diagonal_double_arrow_icon
        </item>
        <item name="pointerIconZoomIn">@drawable/pointer_zoom_in_icon</item>
        <item name="pointerIconZoomOut">@drawable/pointer_zoom_out_icon</item>
        <item name="pointerIconGrab">@drawable/pointer_grab_icon</item>
        <item name="pointerIconGrabbing">@drawable/pointer_grabbing_icon</item>
    </style>

这里只更改了默认，在按钮上和在文本上的鼠标样式，其他的与默认保持一致

以默认图标为例：增加文件\frameworks\base\core\res\res\drawable\pointer_arrow_blue_icon.xml

<?xml version="1.0" encoding="utf-8"?>
<pointer-icon xmlns:android="http://schemas.android.com/apk/res/android"
    android:bitmap="@drawable/pointer_arrow_blue"
    android:hotSpotX="7dp"
    android:hotSpotY="7dp" />

增加鼠标图片

注意要适配不同的分辨率，要增加多张不同大小的鼠标图片，不然某些分辨率鼠标图标会过大或者过小

声明风格

声明这个新定义的鼠标样式：\frameworks\base\core\res\res\values\symbols.xml

这样就可以在java代码中引用：com.android.internal.R.<type>.<name>，在布局xml中引用：“@*android:<type>/<name>”，否则编译时会报找不到这个风格属性的错误

调用

设置鼠标风格位置：\frameworks\base\core\java\android\view\PointerIcon.java

最后编译系统就可以看到鼠标的样式已经改变