Android系统添加自定义鼠标样式通过按键切换实例详解

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 ：

<?xml version="1.0" encoding="utf-8"?>
<pointer-icon xmlns:android="http://schemas.android.com/apk/res/android"
  android:bitmap="@drawable/pointer_red_dot_arrow"
  android:hotspotx="6dp"
  android:hotspoty="6dp" />

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

<?xml version="1.0" encoding="utf-8"?>
<pointer-icon xmlns:android="http://schemas.android.com/apk/res/android"
  android:bitmap="@drawable/pointer_arrow_red_dot"
  android:hotspotx="5dp"
  android:hotspoty="5dp" />

pointer_arrow_red_dot_large_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_red_dot_large"
  android:hotspotx="10dp"
  android:hotspoty="10dp" />

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：

void nativeinputmanager::loadadditionalmouseresources(std::map<int32_t, spriteicon>* outresources,
    std::map<int32_t, pointeranimation>* outanimationresources) {
  jnienv* env = jnienv();

  for (int iconid = pointer_icon_style_context_menu; iconid <= pointer_icon_style_reddot;
       ++iconid) {
    pointericon pointericon;
    loadsystemiconasspritewithpointericon(
        env, mcontextobj, iconid, &pointericon, &((*outresources)[iconid]));
    if (!pointericon.bitmapframes.empty()) {
      pointeranimation& animationdata = (*outanimationresources)[iconid];
      size_t numframes = pointericon.bitmapframes.size() + 1;
      animationdata.durationperframe =
          milliseconds_to_nanoseconds(pointericon.durationperframe);
      animationdata.animationframes.reserve(numframes);
      animationdata.animationframes.push_back(spriteicon(
          pointericon.bitmap, pointericon.hotspotx, pointericon.hotspoty));
      for (size_t i = 0; i < numframes - 1; ++i) {
       animationdata.animationframes.push_back(spriteicon(
           pointericon.bitmapframes[i], pointericon.hotspotx, pointericon.hotspoty));
      }
    }
  }
  loadsystemiconassprite(env, mcontextobj, pointer_icon_style_null,
      &((*outresources)[pointer_icon_style_null]));
}
 

（4）按键切换鼠标样式

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