一、APP通过View修改鼠标样式
app view上修改鼠标样式比较简单，通过 hover event 获取鼠标坐标并使用如下方法修改为自定义图片：
getWindow().getDecorView().setPointerIcon(PointerIcon.load(getResources(), R.drawable.pointer_spot_touch_icon));
imageView = (ImageView) findViewById(R.id.image_view);
imageView.setOnHoverListener(new View.OnHoverListener() {
@SuppressLint({"SetTextI18n", "ResourceType"})
@Override
public boolean onHover(View v, MotionEvent event) {
int what = event.getAction();
textX.setText("X : " + event.getX());
textY.setText("Y : " + event.getY());
switch(what){
case MotionEvent.ACTION_HOVER_ENTER: //鼠标进入view
Log.i(TAG, "bottom ACTION_HOVER_ENTER...");
mOrgPI = getWindow().getDecorView().getPointerIcon();
getWindow().getDecorView().setPointerIcon(PointerIcon.load(getResources(), R.drawable.pointer_spot_touch_icon));
break;
case MotionEvent.ACTION_HOVER_MOVE: //鼠标在view上
Log.i(TAG, "bottom ACTION_HOVER_MOVE...");
break;
case MotionEvent.ACTION_HOVER_EXIT: //鼠标离开view
Log.i(TAG, "bottom ACTION_HOVER_EXIT...");
getWindow().getDecorView().setPointerIcon(mOrgPI);
break;
}
return false;
}
});
}
其中pointer_spot_touch_icon.xml 需要声明为 pointer-icon ：
<&＃63;xml version="1.0" encoding="utf-8"&＃63;>
二、framework层添加自定义鼠标样式并通过按键切换
（1）添加自定义样式资源
系统图标资源在 frameworks/base/core/res/res/drawable-mdpi/ 目录，其中 pointer_arrow.png、pointer_arrow_large.png 是系统默认的黑色箭头，
pointer_arrow_red_dot.png、pointer_arrow_red_dot_large.png 是自己添加的红点样式图片：
然后在 frameworks/base/core/res/res/drawable/ 目录添加对应的xml:
pointer_arrow_red_dot_icon.xml
<&＃63;xml version="1.0" encoding="utf-8"&＃63;>
pointer_arrow_red_dot_large_icon.xml
<&＃63;xml version="1.0" encoding="utf-8"&＃63;>
修改 frameworks/base/core/res/res/values/styles.xml 添加资源配置，注意名字的匹配！
修改 frameworks/base/core/res/res/values/attrs.xml 引用资源：
（2）Java 层获取资源
修改 frameworks/base/core/java/android/view/PointerIcon.java ，添加如下定义：
在 getSystemIconTypeIndex(int type) 函数中返回之前配置的资源：
（3）c++层添加对应的id并加载资源
修改 frameworks/base/core/jni/android_view_PointerIcon.h
* Pointer icon styles.
* Must match the definition in android.view.PointerIcon.
*/
enum {
POINTER_ICON_STYLE_CUSTOM = -1,
POINTER_ICON_STYLE_NULL = 0,
POINTER_ICON_STYLE_ARROW = 1000,
POINTER_ICON_STYLE_CONTEXT_MENU = 1001,
POINTER_ICON_STYLE_HAND = 1002,
POINTER_ICON_STYLE_HELP = 1003,
POINTER_ICON_STYLE_WAIT = 1004,
POINTER_ICON_STYLE_CELL = 1006,
POINTER_ICON_STYLE_CROSSHAIR = 1007,
POINTER_ICON_STYLE_TEXT = 1008,
POINTER_ICON_STYLE_VERTICAL_TEXT = 1009,
POINTER_ICON_STYLE_ALIAS = 1010,
POINTER_ICON_STYLE_COPY = 1011,
POINTER_ICON_STYLE_NO_DROP = 1012,
POINTER_ICON_STYLE_ALL_SCROLL = 1013,
POINTER_ICON_STYLE_HORIZONTAL_DOUBLE_ARROW = 1014,
POINTER_ICON_STYLE_VERTICAL_DOUBLE_ARROW = 1015,
POINTER_ICON_STYLE_TOP_RIGHT_DOUBLE_ARROW = 1016,
POINTER_ICON_STYLE_TOP_LEFT_DOUBLE_ARROW = 1017,
POINTER_ICON_STYLE_ZOOM_IN = 1018,
POINTER_ICON_STYLE_ZOOM_OUT = 1019,
POINTER_ICON_STYLE_GRAB = 1020,
POINTER_ICON_STYLE_GRABBING = 1021,
POINTER_ICON_STYLE_SPOT_HOVER = 2000,
POINTER_ICON_STYLE_SPOT_TOUCH = 2001,
POINTER_ICON_STYLE_SPOT_ANCHOR = 2002,
POINTER_ICON_STYLE_REDDOT = 10001, //增加自定义样式的枚举定义，与上面 PointerIcon.java 中的变量对应
};
修改 frameworks/base/services/core/jni/com_android_server_input_InputManagerService.cpp ，加载到自定义枚举变量对应的图片资源：
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