以前做过将红外触摸框的触摸事件进行简单的输入子系统获取，使用的是C语言，这次特地将以前的C封装为C++类，这样使用起来相对方便。该触摸事件采用了andrdoid操作事件的思想，采用多线程一个负责读取事件，一个负责分发事件，在类中采用了线程，使用的是linux的pthread_create函数，在类中线程函数我采用的是友元函数的方式。
inputEvent.h 代码如下：
1 #ifndef INPUTEVENT_H
2 #define INPUTEVENT_H
3
4 #include "gui.h"
5 #include <linux/input.h>
6 #include <stdio.h>
7 #include <pthread.h>
8 #include <stdlib.h>
9 #include <sys/types.h>
10 #include <string.h>
11 #include <sys/stat.h>
12 #include <fcntl.h>
13 #include <linux/fb.h>
14 #include <sys/ioctl.h>
15
16 using namespace android;
17
18 class InputEvent
19 {
20 public:
21 InputEvent(void);
22
23 int xScaleyScale(void); //显示屏幕和触摸屏幕比列关系
24
25 int getTouchEventNum() ; // 触摸框事件数列
26
27 friend void* readInput(void *data); //读取事件线程
28
29 friend void* dispatchInput(void *data); //分发事件线程
30
31 float getX(void); //获取x坐标
32
33 float getY(void); //获取y坐标
34
35 float getW(void); //获取触摸宽度
36
37 float getH(void); //获取触摸高度
38
39 int getDown(void); //按下
40
41 int getUp(void); //抬起
42
43 private:
44 //LCD和触摸框转换比例
45 float xScale;
46 float yScale;
47
48 int fd ; // dev的文件描述符
49 int fds[2]; //管道
50
51 float x; //x坐标
52 float y; //y坐标
53 int pressure; //按下
54 float touchMajor; //宽触摸
55 float touchMinor; //高触摸
56 int down,up; // 按下，抬起
57 };
58 #endi
gui.h头文件：
1 #ifndef GUI_H 2 #define GUI_H 3 4 #include <cutils/memory.h> 5 #include <unistd.h> 6 #include <utils/Log.h> 7 #include <binder/IPCThreadState.h> 8 #include <binder/ProcessState.h> 9 #include <binder/IServiceManager.h> 10 #include <gui/SurfaceComposerClient.h> 11 #include <gui/ISurfaceComposer.h> 12 #include <ui/DisplayInfo.h> 13 #include <ui/Rect.h> 14 #include <ui/Region.h> 15 #include <android/native_window.h> 16 #include <SkGraphics.h> 17 #include <SkBitmap.h> 18 #include <SkCanvas.h> 19 #include <SkDevice.h> 20 #include <SkStream.h> 21 #include <SkImageDecoder.h> 22 #include <hardware/hwcomposer_defs.h> 23 #include <errno.h> 24 #include <sys/mman.h> 25 #include <binder/IMemory.h> 26 #include <SkImageEncoder.h> 27 #include <SkData.h> 28 29 #endif
inputEvent.cpp
1 #include "inputEvent.h"
2
3 void* readInput(void *data) //读取事件线程
4 {
5 InputEvent *ev = (InputEvent*)data;
6 struct input_event inputEvent;
7 while(1)
8 {
9 read(ev->fd, &inputEvent, sizeof(struct input_event));
10 // 向管道中写数据
11 write(ev->fds[1], &inputEvent, sizeof(struct input_event));
12 }
13 return NULL;
14 }
15 void* dispatchInput(void *data) //分发事件线程
16 {
17 InputEvent *ev = (InputEvent*)data;
18 struct input_event inputEvent;
19 while(1)
20 {
21 //从管道中读取数据
22 read(ev->fds[0], &inputEvent, sizeof(struct input_event));
23
24 if(inputEvent.type == EV_ABS && inputEvent.code == ABS_X ){
25 float fv = inputEvent.value * 1.0;
26 ev->x = fv * ev->xScale;
27 continue;
28 }
29 if(inputEvent.type == EV_ABS && inputEvent.code == ABS_Y ){
30 float fv = inputEvent.value * 1.0;
31 ev->y = fv * ev->yScale;
32 continue;
33 }
34 if(inputEvent.type == EV_KEY && inputEvent.code == BTN_TOUCH ){
35 ev->pressure = inputEvent.value;
36 if(1 == ev->pressure )
37 {
38 ev->down = 1;
39 ev->up = 0;
40 }
41 else if(0 == ev->pressure)
42 {
43 ev->up = 1;
44 ev->down = 0;
45 }
46 continue;
47 }
48 //增加flag的判断作用是touchMajor和toushMinor事件在pressure事件之前的比较准确
49 if(inputEvent.type == EV_ABS && inputEvent.code == ABS_MT_TOUCH_MAJOR ){
50 float fv = inputEvent.value * 1.0;
51 ev->touchMajor = fv * 10; //10 = 0x4000 / 1920
52 continue;
53 }
54
55 if(inputEvent.type == EV_ABS && inputEvent.code == ABS_MT_TOUCH_MINOR ){
56 float fv = inputEvent.value * 1.0;
57 ev->touchMinor = fv * 18; //18 15 = 0x4000 / 1080;
58 continue;
59 }
60 }
61 return NULL;
62 }
63
64 InputEvent::InputEvent(void)
65 {
66 int num = getTouchEventNum();
67 if( num == -1)
68 {
69 printf("No Touch Event\n");
70 return ;
71 }
72 char name[64];
73 sprintf(name, "/dev/input/event%d", num);
74 fd = open(name, O_RDWR);
75 if(fd < 0)
76 {
77 printf("Open dev Error");
78 return ;
79 }
80
81 xScaleyScale();//初始化xy坐标的比例关系
82
83 //创建无名管道
84 if(-1 == pipe(fds))
85 {
86 printf("pipe\n");
87 exit(-1);
88 }
89 pthread_t readId, disPatchId;
90 pthread_create(&readId, NULL, readInput, (void*)this);
91 pthread_create(&disPatchId, NULL, dispatchInput, (void*)this);
92 return ;
93 }
94 int InputEvent::xScaleyScale(void) //显示屏幕和触摸屏幕比列关系
95 {
96 sp<SurfaceComposerClient> surfaceComposerClient = new SurfaceComposerClient(); //创建SurfaceFlinger的本地代理
97 DisplayInfo displayInfo;
98 //获取屏幕的宽高等信息
99 surfaceComposerClient->getDisplayInfo(surfaceComposerClient->getBuiltInDisplay(HWC_DISPLAY_PRIMARY), &displayInfo);
100 xScale = displayInfo.w / 32768.0;
101 yScale = displayInfo.h / 32768.0;
102 return 0;
103 }
104 int InputEvent::getTouchEventNum() // 触摸框事件数列
105 {
106 char name[64]; /* RATS: Use ok, but could be better */
107 char buf[256] = { 0, }; /* RATS: Use ok */
108 int fd = 0;
109 int i;
110 for (i = 0; i < 32; i++)
111 {
112 sprintf(name, "/dev/input/event%d", i);
113 if ((fd = open(name, O_RDONLY, 0)) >= 0)
114 {
115 ioctl(fd, EVIOCGNAME(sizeof(buf)), buf);
116 if(strstr(buf, "MTOUC Touch"))
117 {
118 close(fd);
119 return i;
120 }
121 //printf("%s\n", name);
122 //printf("name: %s\n", buf);
123 close(fd);
124 }
125 }
126 return -1;
127 }
128
129 float InputEvent::getX(void) //获取x坐标
130 {
131 return this->x;
132 }
133 float InputEvent::getY(void) //获取y坐标
134 {
135 return this->y;
136 }
137 float InputEvent::getW(void) //获取触摸宽度
138 {
139 return this->touchMajor;
140 }
141 float InputEvent::getH(void) //获取触摸高度
142 {
143 return this->touchMinor;
144 }
145 int InputEvent::getDown(void) //按下
146 {
147 return this->down;
148 }
149 int InputEvent::getUp(void) //抬起
150 {
151 return this->up;
152 }
其中gui.h是一些android显示图像的头文件。
测试代码简单：
int main (int argc, char** argv)
{
InputEvent event;
while(1){
printf("X = %d\n",event.getX());
printf("Y = %d\n",event.getY());
}
return 0;
}
时间： 2024-12-07 16:16:13