最近一段时间在搞android的触摸屏校正，想把心得记下来与大家分享，废话不多说，开始讲解．

注：调试使用的是

一、修改内核驱动

修改触摸屏驱动(kernel/drivers/input/touchscreen/s3c-ts.c)

－input_set_abs_params(ts->dev, ABS_X, X_COOR_MIN, X_COOR_MAX, X_COOR_FUZZ, 0);

－input_set_abs_params(ts->dev, ABS_Y, Y_COOR_MIN, Y_COOR_MAX, Y_COOR_FUZZ, 0);

+input_set_abs_params(ts->dev, ABS_X, 0, 0xFFF, 0, 0);

+input_set_abs_params(ts->dev, ABS_Y, 0, 0xFFF, 0, 0);

－input_set_abs_params(ts->dev, ABS_MT_POSITION_X, X_COOR_MIN,X_COOR_MAX, 0, 0);

－input_set_abs_params(ts->dev, ABS_MT_POSITION_Y, Y_COOR_MIN,Y_COOR_MAX, 0, 0);

+input_set_abs_params(ts->dev, ABS_MT_POSITION_X, 0, 0xFFF, 0, 0);

+input_set_abs_params(ts->dev, ABS_MT_POSITION_Y, 0, 0xFFF, 0, 0);

if(m_status == 1){

input_report_abs(ts->dev, ABS_MT_TOUCH_MAJOR, 500);

input_report_abs(ts->dev, ABS_MT_POSITION_X, m_lx);

input_report_abs(ts->dev, ABS_MT_POSITION_Y, m_ly);

+input_report_abs(ts->dev, ABS_PRESSURE, 1);

printk("X1:%d Y1:%d/n",m_lx,m_ly);

input_mt_sync(ts->dev);

input_report_abs(ts->dev, ABS_MT_TOUCH_MAJOR, 500);

input_report_abs(ts->dev, ABS_MT_POSITION_X, press_x);

input_report_abs(ts->dev, ABS_MT_POSITION_Y, press_y);

+ input_report_abs(ts->dev, ABS_PRESSURE, 1);

input_mt_sync(ts->dev);

}

else{

input_report_abs(ts->dev, ABS_MT_TOUCH_MAJOR, 500);

input_report_abs(ts->dev, ABS_MT_POSITION_X, x);

input_report_abs(ts->dev, ABS_MT_POSITION_Y, y);

+ input_report_abs(ts->dev, ABS_PRESSURE, 1);

printk("X2:%d Y2:%d/n",x,y);

input_mt_sync(ts->dev);

}

#if 1

+ input_report_abs(ts->dev, ABS_PRESSURE, 0);

#endif

－input_set_abs_params(ts->dev, ABS_X, X_COOR_MIN, X_COOR_MAX, X_COOR_FUZZ, 0);

－input_set_abs_params(ts->dev, ABS_Y, Y_COOR_MIN, Y_COOR_MAX, Y_COOR_FUZZ, 0);

+input_set_abs_params(ts->dev, ABS_X, 0, 0xFFF, 0, 0);

+input_set_abs_params(ts->dev, ABS_Y, 0, 0xFFF, 0, 0);

－input_set_abs_params(ts->dev, ABS_MT_POSITION_X, X_COOR_MIN,X_COOR_MAX, 0, 0);

－input_set_abs_params(ts->dev, ABS_MT_POSITION_Y, Y_COOR_MIN,Y_COOR_MAX, 0, 0);

+input_set_abs_params(ts->dev, ABS_MT_POSITION_X, 0, 0xFFF, 0, 0);

+input_set_abs_params(ts->dev, ABS_MT_POSITION_Y, 0, 0xFFF, 0, 0);

if(m_status == 1){

input_report_abs(ts->dev, ABS_MT_TOUCH_MAJOR, 500);

input_report_abs(ts->dev, ABS_MT_POSITION_X, m_lx);

input_report_abs(ts->dev, ABS_MT_POSITION_Y, m_ly);

+input_report_abs(ts->dev, ABS_PRESSURE, 1);

printk("X1:%d Y1:%d/n",m_lx,m_ly);

input_mt_sync(ts->dev);

input_report_abs(ts->dev, ABS_MT_TOUCH_MAJOR, 500);

input_report_abs(ts->dev, ABS_MT_POSITION_X, press_x);

input_report_abs(ts->dev, ABS_MT_POSITION_Y, press_y);

+ input_report_abs(ts->dev, ABS_PRESSURE, 1);

input_mt_sync(ts->dev);

}

else {

input_report_abs(ts->dev, ABS_MT_TOUCH_MAJOR, 500);

input_report_abs(ts->dev, ABS_MT_POSITION_X, x);

input_report_abs(ts->dev, ABS_MT_POSITION_Y, y);

+ input_report_abs(ts->dev, ABS_PRESSURE, 1);

printk("X2:%d Y2:%d/n",x,y);

input_mt_sync(ts->dev);

}

#if 1

+ input_report_abs(ts->dev, ABS_PRESSURE, 0);

#endif

这样做的目的是根据使内核不使用限定好的坐标范围，x,y的坐标范围还原成0-4095

二、修改property_service.c(android2_2/system/core/init/property_service.c)

在property_perms增加

{

"ts.config.calibrate" , AID_SYSTEM, 0 }

这样做的目的是为可以了后面使用触摸屏校正程序可以对ts.config.calibrate这个系统属性进行操作，后面会说到．

三、修改InputDevice.java(android2_2/frameworks/base/services/java/com/android/server/InputDevice.java)

在generateAbsMotion函数中增加

String prop = SystemProperties.get("ts.config.calibrate");

if(prop!=null)

{

if(prop.equalsIgnoreCase("start")){

Slog.d("XXW prop", prop);

Slog.d("XXW","prop.equalsIgnoreCase start");

device.tInfo =null;

}

elseif(prop.equalsIgnoreCase("done")){

Slog.d("XXW prop", prop);

Slog.d("XXW","prop.equalsIgnoreCase done");

readCalibrate();

device.tInfo=tInfo;

SystemProperties.set("ts.config.calibrate","end");

}

else{

Slog.i("XXW prop", prop);

Slog.i("XXW","prop.equalsIgnoreCase else");

}

}

String prop = SystemProperties.get("ts.config.calibrate");

if (prop!=null)

{

if (prop.equalsIgnoreCase("start")){

Slog.d("XXW prop", prop);

Slog.d("XXW", "prop.equalsIgnoreCase start");

device.tInfo = null;

}

else if (prop.equalsIgnoreCase("done")){

Slog.d("XXW prop", prop);

Slog.d("XXW", "prop.equalsIgnoreCase done");

readCalibrate();

device.tInfo=tInfo;

SystemProperties.set("ts.config.calibrate", "end");

}

else{

Slog.i("XXW prop", prop);

Slog.i("XXW", "prop.equalsIgnoreCase else");

}

}

这里使用到系统属性ts.config.calibrate，当系统判断为现在处于触摸屏校正模式的时候(也就是ts.config.calibrate值为start的时候)，不对驱动传递上来的坐标值进行转换．

上面第二点在在property_perms增加{

"ts.config.calibrate" , AID_SYSTEM, 0

}是为了系统有权限可以设置／读取这个属性

增加函数

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staticvoidreadCalibrate(){

//xxw added

Slog.i("XXW","readCalibrate!");

TransformInfo t =null;

try{

FileInputStream is =newFileInputStream(CALIBRATION_FILE);

byte[] mBuffer =newbyte[64];

intlen = is.read(mBuffer);

is.close();

if(len >0) {

inti;

for(i =0; i 

if(mBuffer[i] =='/n'||mBuffer[i] ==0) {

break;

}

}

len = i;

}

StringTokenizer st =newStringTokenizer(newString(mBuffer,0,0, len));

t =newTransformInfo ();

t.x1 = Integer.parseInt( st.nextToken() );

t.y1 = Integer.parseInt( st.nextToken() );

t.z1 = Integer.parseInt( st.nextToken() );

t.x2 = Integer.parseInt( st.nextToken() );

t.y2 = Integer.parseInt( st.nextToken() );

t.z2 = Integer.parseInt( st.nextToken() );

t.s = Integer.parseInt( st.nextToken() );

}catch(java.io.FileNotFoundException e) {

Slog.i("XXW","FileNotFound!");

}catch(java.io.IOException e) {

Slog.i("XXW","IOException");

}

tInfo = t;

Slog.i("XXW","readCalibrate done!");

}

static void readCalibrate(){

//xxw added

Slog.i("XXW","readCalibrate!");

TransformInfo t = null;

try {

FileInputStream is = new FileInputStream(CALIBRATION_FILE);

byte[] mBuffer = new byte[64];

int len = is.read(mBuffer);

is.close();

if (len > 0) {

int i;

for (i = 0 ; i < len ; i++) {

if (mBuffer[i] == '/n'||mBuffer[i] == 0) {

break;

}

}

len = i;

}

StringTokenizer st = new StringTokenizer( new String(mBuffer, 0, 0, len));

t = new TransformInfo ();

t.x1 = Integer.parseInt( st.nextToken() );

t.y1 = Integer.parseInt( st.nextToken() );

t.z1 = Integer.parseInt( st.nextToken() );

t.x2 = Integer.parseInt( st.nextToken() );

t.y2 = Integer.parseInt( st.nextToken() );

t.z2 = Integer.parseInt( st.nextToken() );

t.s = Integer.parseInt( st.nextToken() );

} catch (java.io.FileNotFoundException e) {

Slog.i("XXW", "FileNotFound!");

} catch (java.io.IOException e) {

Slog.i("XXW", "IOException");

}

tInfo = t;

Slog.i("XXW","readCalibrate done!");

}

修改InputDevice函数

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InputDevice(int_id,int_classes, String _name,

AbsoluteInfo _absX, AbsoluteInfo _absY,

AbsoluteInfo _absPressure, AbsoluteInfo _absSize) {

id = _id;

classes = _classes;

name = _name;

absX = _absX;

absY = _absY;

absPressure = _absPressure;

absSize = _absSize;

readCalibrate();

InputDevice(int _id, int _classes, String _name,

AbsoluteInfo _absX, AbsoluteInfo _absY,

AbsoluteInfo _absPressure, AbsoluteInfo _absSize) {

id = _id;

classes = _classes;

name = _name;

absX = _absX;

absY = _absY;

absPressure = _absPressure;

absSize = _absSize;

readCalibrate();

编译后生成services.jar,须替换android文件系统里面的system/framwork里面的services.jar

四、修改触摸屏校正程序

修改onTouchEvent(CalibrationTest.java)

CalibrationTest.java这里是我使用的触摸屏校正程序,我的屏的分辨率为800*480，所以改成

mResultPts[(STEP -1) * mPtsLength] =

event.getX()*4095/(800-1);

mResultPts[(STEP -1) * mPtsLength + 1] =

event.getY()*4095/(480-1);

修改AndroidManifest.xml 增加

android:sharedUserId="android.uid.system"

xmlns:android="http://schemas.android.com/apk/res/android"

package="touchscreen.test"

android:sharedUserId="android.uid.system">

修改 Android.mk增加

LOCAL_CERTIFICATE := platform

五、修改init.rc增加

#create tslib

mkdir

/data/system/tslib/ 0777

chmod 0666

/data/system/tslib/pointercal

触摸屏校正看来起貌似简单，但要改的东西确实太多，我自己也是摸索了好几天才搞定的，呵呵！