Android 实现单击鼠标右键返回功能

Jimmy000001

已于 2023-11-20 11:47:41 修改

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分类专栏： FAQ 文章标签： android

于 2023-06-06 16:48:40 首次发布

本文链接：https://blog.youkuaiyun.com/u010664697/article/details/131071327

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文章介绍了如何在Android系统中实现鼠标右键的特殊功能，包括将右键单击映射为返回功能，屏蔽右键滑动事件，以及添加右键触发菜单的功能。修改了frameworks中的多个文件，如CursorButtonAccumulator.cpp和CursorInputMapper.cpp，添加了AMOTION_EVENT_BUTTON_MENU常量并更新了事件处理逻辑。

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AMOTION_EVENT_BUTTON_PRIMARY = 1 << 0,  //左键
/** secondary */
AMOTION_EVENT_BUTTON_SECONDARY = 1 << 1, //右键
/** tertiary */
AMOTION_EVENT_BUTTON_TERTIARY = 1 << 2, //辅助按钮

1. 实现单击鼠标右键返回功能

 实现单击鼠标右键返回功能

    modified:   frameworks/native/services/inputflinger/reader/mapper/accumulator/CursorButtonAccumulator.cpp

diff --git a/frameworks/native/services/inputflinger/reader/mapper/accumulator/CursorButtonAccumulator.cpp b/frameworks/native/services/inputflinger/reader/mapper/accumulator/CursorButtonAccumulator.cpp
index 168b0a7..197e178 100755
--- a/frameworks/native/services/inputflinger/reader/mapper/accumulator/CursorButtonAccumulator.cpp
+++ b/frameworks/native/services/inputflinger/reader/mapper/accumulator/CursorButtonAccumulator.cpp
@@ -107,7 +107,7 @@ uint32_t CursorButtonAccumulator::getButtonState() const {
     if (mBtnRight) {
         char targetProduct[PROPERTY_VALUE_MAX] = {0};
         property_get("ro.target.product", targetProduct, "");
-        if (strcmp(targetProduct, "box") == 0 || strcmp(targetProduct, "atv") == 0) {
+        if (strcmp(targetProduct, "box") == 0 || strcmp(targetProduct, "atv") == 0 || strcmp(targetProduct, "tablet") == 0) {
             result |= AMOTION_EVENT_BUTTON_BACK;
         } else {
             result |= AMOTION_EVENT_BUTTON_SECONDARY;

2. 屏蔽鼠标右键滑动事件

diff --git a/services/inputflinger/reader/mapper/CursorInputMapper.cpp b/services/inputflinger/reader/mapper/CursorInputMapper.cpp
index edf4573218..7b29de98be 100644
--- a/services/inputflinger/reader/mapper/CursorInputMapper.cpp
+++ b/services/inputflinger/reader/mapper/CursorInputMapper.cpp
@@ -417,7 +417,8 @@ void CursorInputMapper::sync(nsecs_t when, nsecs_t readTime) {
                          mSource, displayId, policyFlags, lastButtonState, currentButtonState);
 
     // Send motion event.
-    if (downChanged || moved || scrolled || buttonsChanged) {
+    if (downChanged || (moved && mCursorButtonAccumulator.getButtonState() != AMOTION_EVENT_BUTTON_SECONDARY) 
+        || scrolled || buttonsChanged) {
         int32_t metaState = getContext()->getGlobalMetaState();
         int32_t buttonState = lastButtonState;
         int32_t motionEventAction;

3. 添加鼠标右键Menu功能

3.1 定义menu

frameworks/native/include/android/input.h
 
/**
 * Constants that identify buttons that are associated with motion events.
 * Refer to the documentation on the MotionEvent class for descriptions of each button.
 */
enum {
    /** primary */
    AMOTION_EVENT_BUTTON_PRIMARY = 1 << 0,
    /** secondary */
    AMOTION_EVENT_BUTTON_SECONDARY = 1 << 1,
    /** tertiary */
    AMOTION_EVENT_BUTTON_TERTIARY = 1 << 2,
    /** back */
    AMOTION_EVENT_BUTTON_BACK = 1 << 3,
    /** forward */
    AMOTION_EVENT_BUTTON_FORWARD = 1 << 4,
    AMOTION_EVENT_BUTTON_STYLUS_PRIMARY = 1 << 5,
    AMOTION_EVENT_BUTTON_STYLUS_SECONDARY = 1 << 6,
	AMTION_EVENT_BUTTON_MENU = 1 << 7,    //add menu by jimmy
};

frameworks/native/services/inputflinger/reader/mapper/TouchCursorInputMapperCommon.h
 
static void synthesizeButtonKeys(InputReaderContext* context, int32_t action, nsecs_t when,
                                 int32_t deviceId, uint32_t source, int32_t displayId,
                                 uint32_t policyFlags, int32_t lastButtonState,
                                 int32_t currentButtonState) {
    synthesizeButtonKey(context, action, when, deviceId, source, displayId, policyFlags,
                        lastButtonState, currentButtonState, AMOTION_EVENT_BUTTON_BACK,
                        AKEYCODE_BACK);
    synthesizeButtonKey(context, action, when, deviceId, source, displayId, policyFlags,
                        lastButtonState, currentButtonState, AMOTION_EVENT_BUTTON_FORWARD,
                        AKEYCODE_FORWARD);
    synthesizeButtonKey(context, action, when, deviceId, source, displayId, policyFlags,
            lastButtonState, currentButtonState, AMTION_EVENT_BUTTON_MENU, AKEYCODE_MENU);//add menu ++ by jimmy
				
}

3.2 实现鼠标右键 menu

framework/native/services/inputflinger/reader/mapper/accumulator/CursorButtonAccumulator.cpp
 
uint32_t CursorButtonAccumulator::getButtonState() const {
    uint32_t result = 0;
    if (mBtnLeft) {
        result |= AMOTION_EVENT_BUTTON_PRIMARY;
    }
    if (mBtnOk) {
       char mKeyMouseState[PROPERTY_VALUE_MAX] = {0};
        property_get("sys.KeyMouse.mKeyMouseState", mKeyMouseState, "off");
        if (strcmp(mKeyMouseState, "on") == 0) {
         result |= AMOTION_EVENT_BUTTON_PRIMARY;
        }
    }
    if (mBtnRight) {
        char targetProduct[PROPERTY_VALUE_MAX] = {0};
        property_get("ro.target.product", targetProduct, "");
        if (strcmp(targetProduct, "box") == 0 || strcmp(targetProduct, "atv") == 0) {
            result |= AMTION_EVENT_BUTTON_MENU; // add menu by jimmy
        } else {
            //result |= AMOTION_EVENT_BUTTON_SECONDARY;
	    result |= AMTION_EVENT_BUTTON_MENU; // add menu by jimmy
        }
    }
    if (mBtnMiddle) {
        result |= AMOTION_EVENT_BUTTON_TERTIARY;
    }
    if (mBtnBack || mBtnSide) {
        result |= AMOTION_EVENT_BUTTON_BACK;
    }
    if (mBtnForward || mBtnExtra) {
        result |= AMOTION_EVENT_BUTTON_FORWARD;
    }
    return result;

}