Android: mouse system add custom styles and through the key switch

A, APP modified mouse style by View

　　The app view modify mouse style is simple, get the mouse coordinates by hover event and modify custom image using the following method:

　　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;
            }
        });
    }

 　Which pointer_spot_touch_icon.xml need to be declared as 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" />

　However, the modified mouse app closed style view, the mouse will be reset to the default style black arrows, and therefore not dependent mouse APP styles need to dynamically switch the layer modified framework system implemented in the source code.

 

Two, framework layer styles and add a custom mouse through the key switch

(1) add a custom style resource

　　System icon resource frameworks / base / core / res / res / drawable-mdpi / directory, where pointer_arrow.png, pointer_arrow_large.png is the default black arrow,

　　pointer_arrow_red_dot.png, pointer_arrow_red_dot_large.png add their own style red dot pictures:

 

 

 

　Xml then added in the corresponding frameworks / base / core / res / res / drawable / directory:

　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" />

Modify frameworks / base / core / res / res / values ​​/ styles.xml add resources, pay attention to matching the name!

 

 

 

 

Modify frameworks / base / core / res / res / values ​​/ attrs.xml reference resources:

 

 

 

(2) Java layer access to resources

　　Modified frameworks / base / core / java / android / view / PointerIcon.java, adding the following definition:

 

 

　　Return before the allocation of resources in getSystemIconTypeIndex (int type) function:

 

 

 

(3) c ++ layer and adding the corresponding load the resource id

　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

 

　　未完待续。。。