1.首先分析為了將OK鍵轉換成鼠標左鍵的工作：

EventHub.h中

（1）定義NEED_CHANGE_MODE：

#define NEED_CHANGE_MODE

????????? 修改RawEvent的結構，增加 keyCode、flags兩個成員

struct RawEvent {nsecs_t when;int32_t deviceId;int32_t type;int32_t code;int32_t value;int32_t keyCode;uint32_t flags; };

EventHub.cpp中

（2）在EventHub::openDeviceLocked（）中不自動獲取deviceID，而是通過指定（可能可以優化）：

// Allocate device. (The device object takes ownership of the fd at this point.)int32_t deviceId = mNextDeviceId++;

改成：

// Allocate device. (The device object takes ownership of the fd at this point.)int32_t deviceId; #ifdef NEED_CHANGE_MODEif(strstr(identifier.name,"Hillcrest")){//identifier.name=="Hillcrest Labs Virtual Pointer"||identifier.name=="Hillcrest MotionEngine Cursor Mover: #0"){//Compatible with two kinds of DongledeviceId = SENSOR_MOUSE_ID;}else if(identifier.name=="XXX"){deviceId = IR_RC_ID;}else{deviceId = mNextDeviceId++;} #else deviceId = mNextDeviceId++; #endif

（3）在InputReader.h中

定義一些會用到的變量：

#ifdef NEED_CHANGE_MODE#define SCANCODE_LEFT_MOUSE 272#define SCANCODE_CENTER 28#define SCANCODE_DPAD_LEFT 105#define SCANCODE_DPAD_RIGHT 106#define SCANCODE_DPAD_UP 103#define SCANCODE_DPAD_DOWN 108#define SCANCODE_MOUSE_WAKE 704#define AKEYCODE_MOUSE_WAKE 4021enum {LOCAL_INDEX_FIRST ,LOCAL_INDEX_SECOND ,LOCAL_INDEX_THIRD ,};enum{KEYEVENT_ACTION_UP,KEYEVENT_ACTION_DOWN,KEYEVENT_ACTION_REPEAT,};bool mMousetoFocus;bool mOktoMouseSure;bool mFlags;bool mTrueMouse;nsecs_t mWaitTime;bool mPowerOn;uint32_t isCursor;void removeFocusEventLocked(RawEvent* rawEvents, size_t count); #endif

（4）在InputReader.cpp中做具體修改：

定義全局bool變量，用于判斷是否要顯示鼠標

static bool bEnablePointer = false;

在InputReader的構造函數中定義一些局部變量

#ifdef NEED_CHANGE_MODEmMousetoFocus=false;mOktoMouseSure=true;isCursor=0;mFlags=false;mWaitTime=0;mTrueMouse=false;mPowerOn=false; #endif

添加一個移除焦點的函數：

#ifdef NEED_CHANGE_MODE void InputReader::removeFocusEventLocked(RawEvent* rawEvents, size_t count){RawEvent* rawEvent = rawEvents;int32_t deviceId = IR_RC_ID;rawEvent->deviceId=deviceId;rawEvent->flags=0;rawEvent->keyCode=AKEYCODE_MOUSE_WAKE;rawEvent->code=SCANCODE_MOUSE_WAKE;rawEvent->type=1;rawEvent->value=1;//down event rawEvent[LOCAL_INDEX_SECOND].deviceId=deviceId;rawEvent[LOCAL_INDEX_SECOND].flags=0;rawEvent[LOCAL_INDEX_SECOND].keyCode=AKEYCODE_MOUSE_WAKE;rawEvent[LOCAL_INDEX_SECOND].code=SCANCODE_MOUSE_WAKE;rawEvent[LOCAL_INDEX_SECOND].type=1;rawEvent[LOCAL_INDEX_SECOND].value=0;//up eventprocessEventsForDeviceLocked(deviceId, rawEvent, count); } #endif

處理在void InputReader::processEventsLocked（）函數中：

void InputReader::processEventsLocked(const RawEvent* rawEvents, size_t count) {for (const RawEvent* rawEvent = rawEvents; count;) {int32_t type = rawEvent->type;size_t batchSize = 1;if (type < EventHubInterface::FIRST_SYNTHETIC_EVENT) {int32_t deviceId = rawEvent->deviceId;while (batchSize < count) {if (rawEvent[batchSize].type >= EventHubInterface::FIRST_SYNTHETIC_EVENT|| rawEvent[batchSize].deviceId != deviceId) {break;}batchSize += 1;} #if DEBUG_RAW_EVENTSALOGD("BatchSize: %d Count: %d", batchSize, count); #endif #ifdef NEED_CHANGE_MODEuint32_t classes = mEventHub->getDeviceClasses(deviceId);if(SENSOR_MOUSE_ID != deviceId && (classes & INPUT_DEVICE_CLASS_CURSOR)){ #if DEBUG_RAW_EVENTSALOGD("type:%d scancode:%d keycode:%d vlaue:%d flags:%d",rawEvent->type,rawEvent->code,rawEvent->keyCode,rawEvent->value,rawEvent->flags); #endif}else{if(!mPowerOn && rawEvent->type== EV_REL){//wake mouse for the first timemOktoMouseSure = false;//Allows you to convert the OK key to mouse left keymMousetoFocus = true;//unfade the cursormPowerOn = true;// the first use of the mouse after system launch}RawEvent* rawEventLocal = const_cast<RawEvent*>(rawEvent);nsecs_t now;now = systemTime(SYSTEM_TIME_MONOTONIC);if(mWaitTime==0){mWaitTime=now;}else{if((now-mWaitTime)*0.000000001>15){if(rawEventLocal->code == SCANCODE_CENTER/*||rawEvent[1].scanCode==28*/){processEventsForDeviceLocked(deviceId, rawEventLocal, batchSize);mWaitTime=now;mMousetoFocus=false;//fade the cursorbreak;}else{if(rawEventLocal->type==EV_REL){//wake up the mouse after sleepmOktoMouseSure = false;//Allows you to convert the OK key to mouse left keymMousetoFocus = true;//unfade the cursor}else if(rawEventLocal->code == SCANCODE_LEFT_MOUSE/*The left Key of Mouse of the Remote Controller*/||rawEventLocal[LOCAL_INDEX_SECOND].code == SCANCODE_LEFT_MOUSE/*The left Key of Any Mouse*/){mMousetoFocus=false;//fade the cursor}else{mOktoMouseSure=true;//Don't intercept the OK keymFlags = true;//Mark the mouse after dormancy}}}mWaitTime=now; }if(mFlags && rawEventLocal->type==EV_REL){//The mouse be awakened first after dormancymOktoMouseSure = false;//Allows you to convert the OK key to mouse left keymFlags = false;mMousetoFocus = true;//unfade the cursor//Change the current event into the eliminational focus event.removeFocusEventLocked(rawEventLocal, batchSize);break;}if(!mTrueMouse){if(rawEventLocal->code == SCANCODE_LEFT_MOUSE||rawEventLocal[LOCAL_INDEX_SECOND].code == SCANCODE_LEFT_MOUSE){ if(!mMousetoFocus){mMousetoFocus=true;//unfade the cursormOktoMouseSure=false;//Allows you to convert the OK key to mouse left keyALOGD("get mouse left click!: deviceid %d scancode: %d", deviceId, rawEvent->code);//Change the current event into the eliminational focus event.removeFocusEventLocked(rawEventLocal, batchSize);break;}}else if(rawEventLocal[LOCAL_INDEX_SECOND].code == SCANCODE_DPAD_UP || rawEventLocal[LOCAL_INDEX_SECOND].code == SCANCODE_DPAD_DOWN|| rawEventLocal[LOCAL_INDEX_SECOND].code == SCANCODE_DPAD_LEFT|| rawEventLocal[LOCAL_INDEX_SECOND].code == SCANCODE_DPAD_RIGHT|| rawEventLocal->code == SCANCODE_DPAD_UP || rawEventLocal->code == SCANCODE_DPAD_DOWN || rawEventLocal->code == SCANCODE_DPAD_LEFT || rawEventLocal->code == SCANCODE_DPAD_RIGHT/*The direction key of Remote Controller in IR mode.*/||(rawEventLocal->value>458830&&rawEventLocal->value<458835)/*The direction key of Keyboard.*/){mMousetoFocus=false;//fade the cursormOktoMouseSure = true;//Don't intercept the OK key}if(!mMousetoFocus/* Drop The Cursor offset event of Mouse */){for(size_t s=0;s<batchSize;s++){ if(rawEventLocal[s].type == EV_REL){ isCursor = 1; break; } } if(isCursor){ for(size_t j=0 ; j<batchSize; j++){ rawEventLocal[j].deviceId = 0; rawEventLocal[j].type = -1; rawEventLocal[j].code = -1; rawEventLocal[j].value = -1; rawEventLocal[j].keyCode = -1; rawEventLocal[j].flags = -1; rawEventLocal[j].when = -1; } isCursor = 0; }}} if(!mOktoMouseSure && !bEnablePointer){//The OK key is converted to the mouse left keyif(rawEventLocal[LOCAL_INDEX_SECOND].code== SCANCODE_CENTER){deviceId=SENSOR_MOUSE_ID;if(rawEventLocal[LOCAL_INDEX_SECOND].value==KEYEVENT_ACTION_DOWN){rawEventLocal->deviceId=SENSOR_MOUSE_ID;rawEventLocal->flags=0;rawEventLocal->value=KEYEVENT_ACTION_DOWN;rawEventLocal->keyCode=0;rawEventLocal->code=SCANCODE_LEFT_MOUSE;rawEventLocal->type=1;rawEventLocal[LOCAL_INDEX_SECOND].deviceId=SENSOR_MOUSE_ID;rawEventLocal[LOCAL_INDEX_SECOND].flags=0;rawEventLocal[LOCAL_INDEX_SECOND].code=0;rawEventLocal[LOCAL_INDEX_SECOND].keyCode=0;rawEventLocal[LOCAL_INDEX_SECOND].type=0;rawEventLocal[LOCAL_INDEX_SECOND].value=0;rawEventLocal[LOCAL_INDEX_THIRD].deviceId=SENSOR_MOUSE_ID;rawEventLocal[LOCAL_INDEX_THIRD].flags=0;rawEventLocal[LOCAL_INDEX_THIRD].code=0;rawEventLocal[LOCAL_INDEX_THIRD].keyCode=0;rawEventLocal[LOCAL_INDEX_THIRD].type=0;rawEventLocal[LOCAL_INDEX_THIRD].value=0; mTrueMouse=true;} else if(rawEventLocal[LOCAL_INDEX_SECOND].value==KEYEVENT_ACTION_UP){rawEventLocal->deviceId=SENSOR_MOUSE_ID;rawEventLocal->flags=0;rawEventLocal->value=KEYEVENT_ACTION_UP;rawEventLocal->keyCode=0;rawEventLocal->code=SCANCODE_LEFT_MOUSE;rawEventLocal->type=1;rawEventLocal[LOCAL_INDEX_SECOND].deviceId=SENSOR_MOUSE_ID;rawEventLocal[LOCAL_INDEX_SECOND].flags=0;rawEventLocal[LOCAL_INDEX_SECOND].code=0;rawEventLocal[LOCAL_INDEX_SECOND].keyCode=0;rawEventLocal[LOCAL_INDEX_SECOND].type=0;rawEventLocal[LOCAL_INDEX_SECOND].value=0; rawEventLocal[LOCAL_INDEX_THIRD].deviceId=SENSOR_MOUSE_ID;rawEventLocal[LOCAL_INDEX_THIRD].flags=0;rawEventLocal[LOCAL_INDEX_THIRD].code=0;rawEventLocal[LOCAL_INDEX_THIRD].keyCode=0;rawEventLocal[LOCAL_INDEX_THIRD].type=0;rawEventLocal[LOCAL_INDEX_THIRD].value=0; mTrueMouse=false;}}else if(rawEventLocal->code== SCANCODE_CENTER/*The enter key / "OK" key event in IR mode*/){deviceId=SENSOR_MOUSE_ID;if(rawEventLocal->value==KEYEVENT_ACTION_REPEAT){mTrueMouse=true;break;}if(batchSize==4){rawEventLocal->deviceId=SENSOR_MOUSE_ID;rawEventLocal->flags=0;rawEventLocal->value=KEYEVENT_ACTION_DOWN;rawEventLocal->keyCode=0;rawEventLocal->code=SCANCODE_LEFT_MOUSE;rawEventLocal->type=1;rawEventLocal[LOCAL_INDEX_SECOND].deviceId=SENSOR_MOUSE_ID; rawEventLocal[LOCAL_INDEX_THIRD].deviceId=SENSOR_MOUSE_ID;rawEventLocal[LOCAL_INDEX_THIRD].flags=0;rawEventLocal[LOCAL_INDEX_THIRD].code=SCANCODE_LEFT_MOUSE;rawEventLocal[LOCAL_INDEX_THIRD].keyCode=0;rawEventLocal[LOCAL_INDEX_THIRD].type=1;rawEventLocal[LOCAL_INDEX_THIRD].value=KEYEVENT_ACTION_UP;rawEventLocal[3].deviceId=SENSOR_MOUSE_ID;}else{ if(rawEventLocal->value==KEYEVENT_ACTION_DOWN){rawEventLocal->deviceId=SENSOR_MOUSE_ID;rawEventLocal->flags=0;rawEventLocal->value=KEYEVENT_ACTION_DOWN;rawEventLocal->keyCode=0;rawEventLocal->code=SCANCODE_LEFT_MOUSE;rawEventLocal->type=1;rawEventLocal[LOCAL_INDEX_SECOND].deviceId=SENSOR_MOUSE_ID;rawEventLocal[LOCAL_INDEX_SECOND].flags=0;rawEventLocal[LOCAL_INDEX_SECOND].code=0;rawEventLocal[LOCAL_INDEX_SECOND].keyCode=0;rawEventLocal[LOCAL_INDEX_SECOND].type=0;rawEventLocal[LOCAL_INDEX_SECOND].value=0;mTrueMouse=true;} else if(rawEventLocal->value==KEYEVENT_ACTION_UP){rawEventLocal->deviceId=SENSOR_MOUSE_ID;rawEventLocal->flags=0;rawEventLocal->value=KEYEVENT_ACTION_UP;rawEventLocal->keyCode=0;rawEventLocal->code=SCANCODE_LEFT_MOUSE;rawEventLocal->type=1;rawEventLocal[LOCAL_INDEX_SECOND].deviceId=SENSOR_MOUSE_ID;rawEventLocal[LOCAL_INDEX_SECOND].flags=0;rawEventLocal[LOCAL_INDEX_SECOND].code=0;rawEventLocal[LOCAL_INDEX_SECOND].keyCode=0;rawEventLocal[LOCAL_INDEX_SECOND].type=0;rawEventLocal[LOCAL_INDEX_SECOND].value=0; mTrueMouse=false;}} } }} #endifprocessEventsForDeviceLocked(deviceId, rawEvent, batchSize);} else {switch (rawEvent->type) {case EventHubInterface::DEVICE_ADDED:addDeviceLocked(rawEvent->when, rawEvent->deviceId);break;case EventHubInterface::DEVICE_REMOVED:removeDeviceLocked(rawEvent->when, rawEvent->deviceId);break;case EventHubInterface::FINISHED_DEVICE_SCAN:handleConfigurationChangedLocked(rawEvent->when);break;default:ALOG_ASSERT(false); // can't happenbreak;}}count -= batchSize;rawEvent += batchSize;} }

這里做的工作就是：

1.

if(SENSOR_MOUSE_ID != deviceId && (classes & INPUT_DEVICE_CLASS_CURSOR))

先通過判斷是否是鼠標設備。

如果是的話才做處理。

2.

if(!mPowerOn && rawEvent->type== EV_REL){//wake mouse for the first time
?????mOktoMouseSure = false;//Allows you to convert the OK key to mouse left key
?????mMousetoFocus = true;//unfade the cursor
?????mPowerOn = true;// the first use of the mouse after system launch
????}

如果不處于開機狀態，那么這時候收到一個rawEvent->type == EV_REL事件的時候

就要mPowerOn = true;以便后續根據這個變量點亮屏幕，達到按任意一個按鍵喚醒電視機的作用。

同時，第一次喚醒的時候，保持焦點模式。

3.

if(mWaitTime==0){
?????mWaitTime=now;
????}else{
?????if((now-mWaitTime)*0.000000001>15){
??????if(rawEventLocal->code == SCANCODE_CENTER/*||rawEvent[1].scanCode==28*/){
???????processEventsForDeviceLocked(deviceId, rawEventLocal, batchSize);
???????mWaitTime=now;
???????mMousetoFocus=false;//fade the cursor
???????break;
??????}else{
???????if(rawEventLocal->type==EV_REL){//wake up the mouse? after sleep
????????mOktoMouseSure = false;//Allows you to convert the OK key to mouse left key
????????mMousetoFocus = true;//unfade the cursor
???????}else if(rawEventLocal->code == SCANCODE_LEFT_MOUSE
????????/*The left Key of Mouse of the Remote Controller*/
????????||rawEventLocal[LOCAL_INDEX_SECOND].code == SCANCODE_LEFT_MOUSE
????????/*The left Key of? Any Mouse*/){
????????mMousetoFocus=false;//fade the cursor
???????}else{
????????mOktoMouseSure=true;//Don't intercept the OK key
????????mFlags = true;//Mark the mouse after dormancy
???????}
??????}
?????}
?????mWaitTime=now;????
????}

這段代碼的意思是：

每次收到按鍵都更新mWaitTime為當前時間。如果這一次的按鍵離上一次操作的時間超過了15min，也就是進入休眠了。

這個時候，如果按enter鍵，隱藏鼠標。而如果收到鼠標事件，則mOktoMouseSure = false；這樣允許將OK鍵轉換成左鍵。

mMousetoFocus = true;喚醒鼠標。否則，mOktoMouseSure=true;不對OK鍵作轉換。

這里的mFlags用于標記鼠標處于休眠狀態

4.

if(mFlags && rawEventLocal->type==EV_REL){//The mouse be awakened first after dormancy
?????mOktoMouseSure = false;//Allows you to convert the OK key to mouse left key
?????mFlags = false;
?????mMousetoFocus = true;//unfade the cursor
?????//Change the current event into the eliminational focus event.
?????removeFocusEventLocked(rawEventLocal, batchSize);
?????break;
?? ??}

這里就是針對鼠標的休眠狀態做處理了，利用了前面的mFlags標記

5.

mTrueMouse，是用于標記是否對按鍵進行攔截的，我們只對down事件進行攔截和轉換就可以了。

if(rawEventLocal->code == SCANCODE_LEFT_MOUSE
??????||rawEventLocal[LOCAL_INDEX_SECOND].code == SCANCODE_LEFT_MOUSE){??
??????if(!mMousetoFocus){
???????mMousetoFocus=true;//unfade the cursor
???????mOktoMouseSure=false;//Allows you to convert the OK key to mouse left key
?????? ?ALOGD("get mouse left click!: deviceid %d scancode: %d", deviceId, rawEvent->code);
???????//Change the current event into the eliminational focus event.
???????removeFocusEventLocked(rawEventLocal, batchSize);
???????break;
??????}
?????}

這里是對鼠標左鍵的處理。

6.

else if(rawEventLocal[LOCAL_INDEX_SECOND].code == SCANCODE_DPAD_UP
??????|| rawEventLocal[LOCAL_INDEX_SECOND].code == SCANCODE_DPAD_DOWN
??????|| rawEventLocal[LOCAL_INDEX_SECOND].code == SCANCODE_DPAD_LEFT
??????|| rawEventLocal[LOCAL_INDEX_SECOND].code == SCANCODE_DPAD_RIGHT
??????|| rawEventLocal->code == SCANCODE_DPAD_UP
??????|| rawEventLocal->code == SCANCODE_DPAD_DOWN
??????|| rawEventLocal->code == SCANCODE_DPAD_LEFT
??????|| rawEventLocal->code == SCANCODE_DPAD_RIGHT
??????/*The direction key of? Remote Controller in IR mode.*/
??????||(rawEventLocal->value>458830&&rawEventLocal->value<458835)
??????/*The direction key of? Keyboard.*/){
?????? ??mMousetoFocus=false;//fade the cursor
??????mOktoMouseSure = true;//Don't intercept the OK key
?????}

這里就是實現對按任意方向鍵消隱鼠標的地方。

7.

if(!mMousetoFocus/* Drop The Cursor offset event of Mouse */){
??????for(size_t s=0;s<batchSize;s++){???????
???????if(rawEventLocal[s].type == EV_REL){????????
????????isCursor = 1;????????
????????break;???????
???????}???????
??????}??????
??????if(isCursor){???????
???????for(size_t j=0 ; j<batchSize; j++){????????
????????rawEventLocal[j].deviceId = 0;???????
????????rawEventLocal[j].type =??? -1;????????
????????rawEventLocal[j].code =??? -1;????????
????????rawEventLocal[j].value =?? -1;????????
????????rawEventLocal[j].keyCode = -1;????????
????????rawEventLocal[j].flags =?? -1;????????
????????rawEventLocal[j].when =??? -1;????????
???????}???????
???????isCursor = 0;?????
??????}
??? ???}

這就是，如果鼠標處于消隱狀態，那么丟掉所有鼠標位移的事件

8

最后就是重點了

對OK鍵的處理：

if(!mOktoMouseSure && !bEnablePointer){//The OK key is converted to the mouse left key

前面的很多邏輯都是標記mOktoMouseSure【OK鍵是否要轉換成鼠標左鍵】，（bEnablePointer應該可以去掉）

這里就是實現OK鍵轉換的邏輯了

if(rawEventLocal[LOCAL_INDEX_SECOND].code== SCANCODE_CENTER){
??????deviceId=SENSOR_MOUSE_ID;
??????if(rawEventLocal[LOCAL_INDEX_SECOND].value==KEYEVENT_ACTION_DOWN){
???????rawEventLocal->deviceId=SENSOR_MOUSE_ID;
???????rawEventLocal->flags=0;
???????rawEventLocal->value=KEYEVENT_ACTION_DOWN;
???????rawEventLocal->keyCode=0;
???????rawEventLocal->code=SCANCODE_LEFT_MOUSE;
???????rawEventLocal->type=1;
???????rawEventLocal[LOCAL_INDEX_SECOND].deviceId=SENSOR_MOUSE_ID;
???????rawEventLocal[LOCAL_INDEX_SECOND].flags=0;
???????rawEventLocal[LOCAL_INDEX_SECOND].code=0;
???????rawEventLocal[LOCAL_INDEX_SECOND].keyCode=0;
???????rawEventLocal[LOCAL_INDEX_SECOND].type=0;
???????rawEventLocal[LOCAL_INDEX_SECOND].value=0;
???????rawEventLocal[LOCAL_INDEX_THIRD].deviceId=SENSOR_MOUSE_ID;
???????rawEventLocal[LOCAL_INDEX_THIRD].flags=0;
???????rawEventLocal[LOCAL_INDEX_THIRD].code=0;
???????rawEventLocal[LOCAL_INDEX_THIRD].keyCode=0;
???????rawEventLocal[LOCAL_INDEX_THIRD].type=0;
???????rawEventLocal[LOCAL_INDEX_THIRD].value=0;?
???????mTrueMouse=true;
???????? ??}?
????? ??else if(rawEventLocal[LOCAL_INDEX_SECOND].value==KEYEVENT_ACTION_UP){
???????rawEventLocal->deviceId=SENSOR_MOUSE_ID;
???????rawEventLocal->flags=0;
???????rawEventLocal->value=KEYEVENT_ACTION_UP;
???????rawEventLocal->keyCode=0;
???????rawEventLocal->code=SCANCODE_LEFT_MOUSE;
???????rawEventLocal->type=1;
???????rawEventLocal[LOCAL_INDEX_SECOND].deviceId=SENSOR_MOUSE_ID;
???????rawEventLocal[LOCAL_INDEX_SECOND].flags=0;
???????rawEventLocal[LOCAL_INDEX_SECOND].code=0;
???????rawEventLocal[LOCAL_INDEX_SECOND].keyCode=0;
???????rawEventLocal[LOCAL_INDEX_SECOND].type=0;
???????rawEventLocal[LOCAL_INDEX_SECOND].value=0;????
???????rawEventLocal[LOCAL_INDEX_THIRD].deviceId=SENSOR_MOUSE_ID;
???????rawEventLocal[LOCAL_INDEX_THIRD].flags=0;
???????rawEventLocal[LOCAL_INDEX_THIRD].code=0;
???????rawEventLocal[LOCAL_INDEX_THIRD].keyCode=0;
???????rawEventLocal[LOCAL_INDEX_THIRD].type=0;
???????rawEventLocal[LOCAL_INDEX_THIRD].value=0;?
???????mTrueMouse=false;
????? ??}
?????}
???? ??else if(rawEventLocal->code== SCANCODE_CENTER/*The enter key / "OK" key event in IR mode*/){
???? ???deviceId=SENSOR_MOUSE_ID;
???? ???if(rawEventLocal->value==KEYEVENT_ACTION_REPEAT){
???????mTrueMouse=true;
???????break;
??????}
??????if(batchSize==4){
???????rawEventLocal->deviceId=SENSOR_MOUSE_ID;
???????rawEventLocal->flags=0;
???????rawEventLocal->value=KEYEVENT_ACTION_DOWN;
???????rawEventLocal->keyCode=0;
???????rawEventLocal->code=SCANCODE_LEFT_MOUSE;
???????rawEventLocal->type=1;
???????rawEventLocal[LOCAL_INDEX_SECOND].deviceId=SENSOR_MOUSE_ID;??
???????rawEventLocal[LOCAL_INDEX_THIRD].deviceId=SENSOR_MOUSE_ID;
???????rawEventLocal[LOCAL_INDEX_THIRD].flags=0;
???????rawEventLocal[LOCAL_INDEX_THIRD].code=SCANCODE_LEFT_MOUSE;
???????rawEventLocal[LOCAL_INDEX_THIRD].keyCode=0;
???????rawEventLocal[LOCAL_INDEX_THIRD].type=1;
???????rawEventLocal[LOCAL_INDEX_THIRD].value=KEYEVENT_ACTION_UP;
???????rawEventLocal[3].deviceId=SENSOR_MOUSE_ID;
??????}else{???
?????? if(rawEventLocal->value==KEYEVENT_ACTION_DOWN){
???????rawEventLocal->deviceId=SENSOR_MOUSE_ID;
???????rawEventLocal->flags=0;
???????rawEventLocal->value=KEYEVENT_ACTION_DOWN;
???????rawEventLocal->keyCode=0;
???????rawEventLocal->code=SCANCODE_LEFT_MOUSE;
???????rawEventLocal->type=1;
???????rawEventLocal[LOCAL_INDEX_SECOND].deviceId=SENSOR_MOUSE_ID;
???????rawEventLocal[LOCAL_INDEX_SECOND].flags=0;
???????rawEventLocal[LOCAL_INDEX_SECOND].code=0;
???????rawEventLocal[LOCAL_INDEX_SECOND].keyCode=0;
???????rawEventLocal[LOCAL_INDEX_SECOND].type=0;
???????rawEventLocal[LOCAL_INDEX_SECOND].value=0;
???????mTrueMouse=true;
???????? ??}?
????? ??else if(rawEventLocal->value==KEYEVENT_ACTION_UP){
???????rawEventLocal->deviceId=SENSOR_MOUSE_ID;
???????rawEventLocal->flags=0;
???????rawEventLocal->value=KEYEVENT_ACTION_UP;
???????rawEventLocal->keyCode=0;
???????rawEventLocal->code=SCANCODE_LEFT_MOUSE;
???????rawEventLocal->type=1;
???????rawEventLocal[LOCAL_INDEX_SECOND].deviceId=SENSOR_MOUSE_ID;
???????rawEventLocal[LOCAL_INDEX_SECOND].flags=0;
???????rawEventLocal[LOCAL_INDEX_SECOND].code=0;
???????rawEventLocal[LOCAL_INDEX_SECOND].keyCode=0;
???????rawEventLocal[LOCAL_INDEX_SECOND].type=0;
???????rawEventLocal[LOCAL_INDEX_SECOND].value=0;??
???????mTrueMouse=false;
????? ??}
??????}?
???? ??}

其實就是對

rawEventLocal[LOCAL_INDEX_SECOND].code== SCANCODE_CENTER和rawEventLocal->code== SCANCODE_CENTER兩種情況作處理。

（這里rawEventLocal有三組值，通過getevent我們可以看到，每按一個按鍵，是會有三個數據顯示的，類似：

# getevent/dev/input/event0: EV_MSC MSC_SCAN 0000f00b /dev/input/event0: EV_KEY KEY_ENTER DOWN /dev/input/event0: EV_SYN SYN_REPORT 00000000 /dev/input/event0: EV_KEY KEY_ENTER UP /dev/input/event0: EV_SYN SYN_REPORT 00000000

所以判斷的時候，要針對DOWN事件的第二組值作處理。

）

?那么問題來了。現在鼠標模式下在InputReader.cpp中將所有OK鍵進行了攔截轉換成鼠標左鍵，以達到按OK鍵當鼠標左鍵的作用，那么Android系統中怎么樣在視頻播放這樣一個場景下，不對OK鍵進行攔截呢？

?

結論：

這個問題還是當初的設計問題，如果決定在系統層將所有OK鍵轉換成鼠標左鍵，那么自然上層所有的OK鍵都是起鼠標左鍵的效果。這個時候你又要求某一個第三方應用還是保留原來的OK鍵的效果，很明顯是矛盾的。

如果要解決這個問題，只能是在視頻全屏播放的時候，不開啟空鼠模式！！java層獲取到是否是視頻播放狀態，然后通過jni調用接口來操作C++層，這個方式可行，但是動作太大了。而且在系統層對單一場景特別處理顯然不好。

總結

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