一、Android输入子系统简介：

　　Android输入事件的源头是位于/dev/input/下的设备节点，而输入系统的终点是由WMS管理的某个窗口。最初的输入事件为内核生成的原始事件，而最终交付给窗口的则是KeyEvent或MotionEvent对象。因此Android输入系统的主要工作是读取设备节点中的原始事件，将其加工封装，然后派发给一个特定的窗口以及窗口中的控件。这个过程由InputManagerService（以下简称IMS）系统服务为核心的多个参与者共同完成。

　　　　　　　　　　　　　　　　　　　　　　　　图1：输入系统的总体流程与参与者

二、键值映射关系：

    ①IR硬件扫描码在驱动里面被映射为 include/uapi/linux/input.h 里面定义的某个键值，但这个键值只在linux系统(内核)中使用。
　　②Android通过源码目录下的 device/xxx/xxx.kl(keylayout) 文件完成linux键值到Android系统要使用的键值映射。
 
 　以HID设备为例，首先内核中的键值转换在drivers/hid/hid-input.c 中进行映射，键值通道也有多种类型，例如：keyboard、consumer 等等；
　　//keyboard通道键值则是在如下数组添加修改： 
  1. static const unsigned char hid_keyboard[] = {
  2.       ,  ,  ,  , , , , , , , , , , , , ,
  3.      , , , , , , , , , , , , , ,  ,  ,
  4.       ,  ,  ,  ,  ,  , , , ,  , , , , , , ,
  5.      , , , , , , , , , , , , , , , ,
  6.      , , , , , , , ,,,,,,,,,
  7.     ,,, , , , , , , , , , , , , ,
  8.      , , , , ,,,,,,,,,,,,
  9.     ,,,,,,,,,,,,,,,,
  10.     ,,unk,unk,unk,,unk, , ,, , , ,unk,unk,unk,
  11.     ,, , , ,unk,unk,unk,unk,unk,unk,unk,,unk,unk,unk,
  12.     unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,
  13.     unk,unk,unk,unk,unk,unk,,,unk,unk,unk,unk,unk,unk,unk,unk,
  14.     unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,
  15.     unk,unk,unk,unk,unk,unk,unk,unk,,unk,unk,unk,unk,unk,unk,unk,
  16.      , , ,, , ,,,,,,,,,,,
  17.     ,,,,,,,,,,,,unk,unk,unk,unk
  18. };
  19.  
  20. ......
  21.  
  22. //然后在以下代码部分使用：
  23.     case HID_UP_KEYBOARD:
  24.         set_bit(EV_REP, input->evbit);
  25.  
  26.         if ((usage->hid & HID_USAGE) < ) {
  27.             if (!hid_keyboard[usage->hid & HID_USAGE]) goto ignore;
  28.             map_key_clear(hid_keyboard[usage->hid & HID_USAGE]);
  29.         } else
  30.             map_key(KEY_UNKNOWN);
  31.  
  32.         break;

　//consumer通道键值则是在如下添加修改：

  1. case HID_UP_CONSUMER:    /* USB HUT v1.12, pages 75-84 */
  2.         switch (usage->hid & HID_USAGE) {
  3.         case 0x000: goto ignore;
  4.         case 0x030: map_key_clear(KEY_POWER);        break;
  5.         case 0x031: map_key_clear(KEY_RESTART);        break;
  6.         case 0x032: map_key_clear(KEY_SLEEP);        break;
  7.         case 0x034: map_key_clear(KEY_SLEEP);        break;
  8.         case 0x035: map_key_clear(KEY_KBDILLUMTOGGLE);    break;
  9.         case 0x036: map_key_clear(BTN_MISC);        break;
  10.         case 0x040: map_key_clear(KEY_MENU);        break; /* Menu */
  11.         case 0x041: map_key_clear(KEY_SELECT);        break; /* Menu Pick */
  12.         case 0x042: map_key_clear(KEY_UP);        break; /* Menu Up */
  13.         case 0x043: map_key_clear(KEY_DOWN);        break; /* Menu Down */
  14.         case 0x044: map_key_clear(KEY_LEFT);        break; /* Menu Left */
  15.         case 0x045: map_key_clear(KEY_RIGHT);        break; /* Menu Right */
  16.         case 0x046: map_key_clear(KEY_ESC);        break; /* Menu Escape */
  17.         case 0x047: map_key_clear(KEY_KPPLUS);        break; /* Menu Value Increase */
  18.         case 0x048: map_key_clear(KEY_KPMINUS);        break; /* Menu Value Decrease */
  19.         case 0x060: map_key_clear(KEY_INFO);        break; /* Data On Screen */
  20.         case 0x061: map_key_clear(KEY_SUBTITLE);    break; /* Closed Caption */
  21.         case 0x063: map_key_clear(KEY_VCR);        break; /* VCR/TV */
  22.         case 0x065: map_key_clear(KEY_CAMERA);        break; /* Snapshot */
  23.         case 0x069: map_key_clear(KEY_RED);        break;
  24.         case 0x06a: map_key_clear(KEY_GREEN);        break;
  25.         case 0x06b: map_key_clear(KEY_BLUE);        break;
  26.         case 0x06c: map_key_clear(KEY_YELLOW);        break;
  27.         case 0x06d: map_key_clear(KEY_ZOOM);        break;
  28.         case 0x082: map_key_clear(KEY_VIDEO_NEXT);    break;
  29.         case 0x083: map_key_clear(KEY_LAST);        break;
  30.         case 0x084: map_key_clear(KEY_ENTER);        break;
  31.         case 0x088: map_key_clear(KEY_PC);        break;
  32.         case 0x089: map_key_clear(KEY_TV);        break;
  33.         case 0x08a: map_key_clear(KEY_WWW);        break;
  34.         case 0x08b: map_key_clear(KEY_DVD);        break;
  35.         case 0x08c: map_key_clear(KEY_PHONE);        break;
  36.         case 0x08d: map_key_clear(KEY_PROGRAM);        break;
  37.         case 0x08e: map_key_clear(KEY_VIDEOPHONE);    break;
  38.         case 0x08f: map_key_clear(KEY_GAMES);        break;
  39.         case 0x090: map_key_clear(KEY_MEMO);        break;
  40.         case 0x091: map_key_clear(KEY_CD);        break;
  41.         case 0x092: map_key_clear(KEY_VCR);        break;
  42.         case 0x093: map_key_clear(KEY_TUNER);        break;
  43.         case 0x094: map_key_clear(KEY_EXIT);        break;
  44.         case 0x095: map_key_clear(KEY_HELP);        break;
  45.         case 0x096: map_key_clear(KEY_TAPE);        break;
  46.         case 0x097: map_key_clear(KEY_TV2);        break;
  47.         case 0x098: map_key_clear(KEY_SAT);        break;
  48.         case 0x09a: map_key_clear(KEY_PVR);        break;
  49.         case 0x09c: map_key_clear(KEY_CHANNELUP);    break;
  50.         case 0x09d: map_key_clear(KEY_CHANNELDOWN);    break;
  51.         case 0x0a0: map_key_clear(KEY_VCR2);        break;
  52.         case 0x0b0: map_key_clear(KEY_PLAY);        break;
  53.         case 0x0b1: map_key_clear(KEY_PAUSE);        break;
  54.         case 0x0b2: map_key_clear(KEY_RECORD);        break;
  55.         case 0x0b3: map_key_clear(KEY_FASTFORWARD);    break;
  56.         case 0x0b4: map_key_clear(KEY_REWIND);        break;
  57.         case 0x0b5: map_key_clear(KEY_NEXTSONG);    break;
  58.         case 0x0b6: map_key_clear(KEY_PREVIOUSSONG);    break;
  59.         case 0x0b7: map_key_clear(KEY_STOPCD);        break;
  60.         case 0x0b8: map_key_clear(KEY_EJECTCD);        break;
  61.         case 0x0bc: map_key_clear(KEY_MEDIA_REPEAT);    break;
  62.         case 0x0b9: map_key_clear(KEY_SHUFFLE);        break;
  63.         case 0x0bf: map_key_clear(KEY_SLOW);        break;
  64.         case 0x0cd: map_key_clear(KEY_PLAYPAUSE);    break;
  65.         case 0x0e0: map_abs_clear(ABS_VOLUME);        break;
  66.         case 0x0e2: map_key_clear(KEY_MUTE);        break;
  67.         case 0x0e5: map_key_clear(KEY_BASSBOOST);    break;
  68.         case 0x0e9: map_key_clear(KEY_VOLUMEUP);    break;
  69.         case 0x0ea: map_key_clear(KEY_VOLUMEDOWN);    break;
  70.         case 0x0f5: map_key_clear(KEY_SLOW);        break;
  71.         case 0x182: map_key_clear(KEY_BOOKMARKS);    break;
  72.         case 0x183: map_key_clear(KEY_CONFIG);        break;
  73.         case 0x184: map_key_clear(KEY_WORDPROCESSOR);    break;
  74.         case 0x185: map_key_clear(KEY_EDITOR);        break;
  75.         case 0x186: map_key_clear(KEY_SPREADSHEET);    break;
  76.         case 0x187: map_key_clear(KEY_GRAPHICSEDITOR);    break;
  77.         case 0x188: map_key_clear(KEY_PRESENTATION);    break;
  78.         case 0x189: map_key_clear(KEY_DATABASE);    break;
  79.         case 0x18a: map_key_clear(KEY_MAIL);        break;
  80.         case 0x18b: map_key_clear(KEY_NEWS);        break;
  81.         case 0x18c: map_key_clear(KEY_VOICEMAIL);    break;
  82.         case 0x18d: map_key_clear(KEY_ADDRESSBOOK);    break;
  83.         case 0x18e: map_key_clear(KEY_CALENDAR);    break;
  84.         case 0x191: map_key_clear(KEY_FINANCE);        break;
  85.         case 0x192: map_key_clear(KEY_CALC);        break;
  86.         case 0x193: map_key_clear(KEY_PLAYER);        break;
  87.         case 0x194: map_key_clear(KEY_FILE);        break;
  88.         case 0x196: map_key_clear(KEY_WWW);        break;
  89.         case 0x199: map_key_clear(KEY_CHAT);        break;
  90.         case 0x19c: map_key_clear(KEY_LOGOFF);        break;
  91.         case 0x19e: map_key_clear(KEY_COFFEE);        break;
  92.         case 0x1a6: map_key_clear(KEY_HELP);        break;
  93.         case 0x1a7: map_key_clear(KEY_DOCUMENTS);    break;
  94.         case 0x1ab: map_key_clear(KEY_SPELLCHECK);    break;
  95.         case 0x1ae: map_key_clear(KEY_KEYBOARD);    break;
  96.         case 0x1b6: map_key_clear(KEY_IMAGES);        break;
  97.         case 0x1b7: map_key_clear(KEY_AUDIO);        break;
  98.         case 0x1b8: map_key_clear(KEY_VIDEO);        break;
  99.         case 0x1bc: map_key_clear(KEY_MESSENGER);    break;
  100.         case 0x1bd: map_key_clear(KEY_INFO);        break;
  101.         case 0x201: map_key_clear(KEY_NEW);        break;
  102.         case 0x202: map_key_clear(KEY_OPEN);        break;
  103.         case 0x203: map_key_clear(KEY_CLOSE);        break;
  104.         case 0x204: map_key_clear(KEY_EXIT);        break;
  105.         case 0x207: map_key_clear(KEY_SAVE);        break;
  106.         case 0x208: map_key_clear(KEY_PRINT);        break;
  107.         case 0x209: map_key_clear(KEY_PROPS);        break;
  108.         case 0x21a: map_key_clear(KEY_UNDO);        break;
  109.         case 0x21b: map_key_clear(KEY_COPY);        break;
  110.         case 0x21c: map_key_clear(KEY_CUT);        break;
  111.         case 0x21d: map_key_clear(KEY_PASTE);        break;
  112.         case 0x21f: map_key_clear(KEY_FIND);        break;
  113.         case 0x221: map_key_clear(KEY_SEARCH);        break;
  114.         case 0x222: map_key_clear(KEY_GOTO);        break;
  115.         case 0x223: map_key_clear(KEY_HOMEPAGE);    break;
  116.         case 0x224: map_key_clear(KEY_BACK);        break;
  117.         case 0x225: map_key_clear(KEY_FORWARD);        break;
  118.         case 0x226: map_key_clear(KEY_STOP);        break;
  119.         case 0x227: map_key_clear(KEY_REFRESH);        break;
  120.         case 0x22a: map_key_clear(KEY_BOOKMARKS);    break;
  121.         case 0x22d: map_key_clear(KEY_ZOOMIN);        break;
  122.         case 0x22e: map_key_clear(KEY_ZOOMOUT);        break;
  123.         case 0x22f: map_key_clear(KEY_ZOOMRESET);    break;
  124.         case 0x233: map_key_clear(KEY_SCROLLUP);    break;
  125.         case 0x234: map_key_clear(KEY_SCROLLDOWN);    break;
  126.         case 0x238: map_rel(REL_HWHEEL);        break;
  127.         case 0x23d: map_key_clear(KEY_EDIT);        break;
  128.         case 0x25f: map_key_clear(KEY_CANCEL);        break;
  129.         case 0x269: map_key_clear(KEY_INSERT);        break;
  130.         case 0x26a: map_key_clear(KEY_DELETE);        break;
  131.         case 0x279: map_key_clear(KEY_REDO);        break;
  132.         case 0x289: map_key_clear(KEY_REPLY);        break;
  133.         case 0x28b: map_key_clear(KEY_FORWARDMAIL);    break;
  134.         case 0x28c: map_key_clear(KEY_SEND);        break;
  135.         default:    goto ignore;
  136.         }
  137.         break;

通过 map_key_clear 宏将原始键值（usage->hid & HID_USAGE）转换成内核的定义，映射函数的具体实现可看内核源码，

以上键值的定义在 include/uapi/linux/input-event-codes.h （内核代码,较新版本定义整合进了input.h），对应到Android系统层的头文件则是 bionic/libc/kernel/uapi/linux/input-event-codes.h：

  1. #define KEY_RESERVED  0
  2. #define KEY_ESC   1
  3. #define KEY_1   2
  4. #define KEY_2   3
  5. #define KEY_3   4
  6. #define KEY_4   5
  7. #define KEY_5   6
  8. #define KEY_6   7
  9. #define KEY_7   8
  10. #define KEY_8   9
  11. #define KEY_9   10
  12. #define KEY_0   11
  13. #define KEY_MINUS  12
  14. #define KEY_EQUAL  13
  15. #define KEY_BACKSPACE  14
  16. #define KEY_TAB   15
  17. #define KEY_Q   16
  18. #define KEY_W   17
  19. #define KEY_E   18
  20. #define KEY_R   19
  21. #define KEY_T   20
  22. #define KEY_Y   21
  23. #define KEY_U   22
  24. #define KEY_I   23
  25. #define KEY_O   24
  26. #define KEY_P   25
  27. #define KEY_LEFTBRACE  26
  28. #define KEY_RIGHTBRACE  27
  29. #define KEY_ENTER  28
  30. #define KEY_LEFTCTRL  29
  31. #define KEY_A   30
  32. #define KEY_S   31
  33. #define KEY_D   32
  34. #define KEY_F   33
  35. #define KEY_G   34
  36. #define KEY_H   35
  37. #define KEY_J   36
  38. #define KEY_K   37
  39. #define KEY_L   38
  40. #define KEY_SEMICOLON  39
  41. #define KEY_APOSTROPHE  40
  42. #define KEY_GRAVE  41
  43. #define KEY_LEFTSHIFT  42
  44. #define KEY_BACKSLASH  43
  45. #define KEY_Z   44
  46. #define KEY_X   45
  47. #define KEY_C   46
  48. #define KEY_V   47
  49. #define KEY_B   48
  50. #define KEY_N   49
  51. #define KEY_M   50
  52. #define KEY_COMMA  51
  53. #define KEY_DOT   52
  54. #define KEY_SLASH  53
  55. #define KEY_RIGHTSHIFT  54
  56. #define KEY_KPASTERISK  55
  57. #define KEY_LEFTALT  56
  58. #define KEY_SPACE  57
  59. #define KEY_CAPSLOCK  58
  60. #define KEY_F1   59
  61. #define KEY_F2   60
  62. #define KEY_F3   61
  63. #define KEY_F4   62
  64. #define KEY_F5   63
  65. #define KEY_F6   64
  66. #define KEY_F7   65
  67. #define KEY_F8   66
  68. #define KEY_F9   67
  69. #define KEY_F10   68
  70. #define KEY_NUMLOCK  69
  71. #define KEY_SCROLLLOCK  70
  72. #define KEY_KP7   71
  73. #define KEY_KP8   72
  74. #define KEY_KP9   73
  75. #define KEY_KPMINUS  74
  76. #define KEY_KP4   75
  77. #define KEY_KP5   76
  78. #define KEY_KP6   77
  79. #define KEY_KPPLUS  78
  80. #define KEY_KP1   79
  81. #define KEY_KP2   80
  82. #define KEY_KP3   81
  83. #define KEY_KP0   82
  84. #define KEY_KPDOT  83
  85.  
  86. #define KEY_ZENKAKUHANKAKU 85
  87. #define KEY_102ND  86
  88. #define KEY_F11   87
  89. #define KEY_F12   88
  90. #define KEY_RO   89
  91. #define KEY_KATAKANA  90
  92. #define KEY_HIRAGANA  91
  93. #define KEY_HENKAN  92
  94. #define KEY_KATAKANAHIRAGANA 93
  95. #define KEY_MUHENKAN  94
  96. #define KEY_KPJPCOMMA  95
  97. #define KEY_KPENTER  96
  98. #define KEY_RIGHTCTRL  97
  99. #define KEY_KPSLASH  98
  100. #define KEY_SYSRQ  99
  101. #define KEY_RIGHTALT  100
  102. #define KEY_LINEFEED  101
  103. #define KEY_HOME  102
  104. #define KEY_UP   103
  105. #define KEY_PAGEUP  104
  106. #define KEY_LEFT  105
  107. #define KEY_RIGHT  106
  108. #define KEY_END   107
  109. #define KEY_DOWN  108
  110. #define KEY_PAGEDOWN  109
  111. #define KEY_INSERT  110
  112. #define KEY_DELETE  111
  113. #define KEY_MACRO  112
  114. #define KEY_MUTE  113
  115. #define KEY_VOLUMEDOWN  114
  116. #define KEY_VOLUMEUP  115
  117. #define KEY_POWER  116 /* SC System Power Down */
  118. #define KEY_KPEQUAL  117
  119. #define KEY_KPPLUSMINUS  118
  120. #define KEY_PAUSE  119
  121. #define KEY_SCALE  120 /* AL Compiz Scale (Expose) */
  122.  
  123. #define KEY_KPCOMMA  121
  124. #define KEY_HANGEUL  122
  125. #define KEY_HANGUEL  KEY_HANGEUL
  126. #define KEY_HANJA  123
  127. #define KEY_YEN   124
  128. #define KEY_LEFTMETA  125
  129. #define KEY_RIGHTMETA  126
  130. #define KEY_COMPOSE  127
  131.  
  132. #define KEY_STOP  128 /* AC Stop */
  133. #define KEY_AGAIN  129
  134. #define KEY_PROPS  130 /* AC Properties */
  135. #define KEY_UNDO  131 /* AC Undo */
  136. #define KEY_FRONT  132
  137. #define KEY_COPY  133 /* AC Copy */
  138. #define KEY_OPEN  134 /* AC Open */
  139. #define KEY_PASTE  135 /* AC Paste */
  140. #define KEY_FIND  136 /* AC Search */
  141. #define KEY_CUT   137 /* AC Cut */
  142. #define KEY_HELP  138 /* AL Integrated Help Center */
  143. #define KEY_MENU  139 /* Menu (show menu) */
  144. #define KEY_CALC  140 /* AL Calculator */
  145. #define KEY_SETUP  141
  146. #define KEY_SLEEP  142 /* SC System Sleep */
  147. #define KEY_WAKEUP  143 /* System Wake Up */
  148. #define KEY_FILE  144 /* AL Local Machine Browser */
  149. #define KEY_SENDFILE  145
  150. #define KEY_DELETEFILE  146
  151. #define KEY_XFER  147
  152. #define KEY_PROG1  148
  153. #define KEY_PROG2  149
  154. #define KEY_WWW   150 /* AL Internet Browser */
  155. #define KEY_MSDOS  151
  156. #define KEY_COFFEE  152 /* AL Terminal Lock/Screensaver */
  157. #define KEY_SCREENLOCK  KEY_COFFEE
  158. #define KEY_DIRECTION  153
  159. #define KEY_CYCLEWINDOWS 154
  160. #define KEY_MAIL  155
  161. #define KEY_BOOKMARKS  156 /* AC Bookmarks */
  162. #define KEY_COMPUTER  157
  163. #define KEY_BACK  158 /* AC Back */
  164. #define KEY_FORWARD  159 /* AC Forward */
  165. #define KEY_CLOSECD  160
  166. #define KEY_EJECTCD  161
  167. #define KEY_EJECTCLOSECD 162
  168. #define KEY_NEXTSONG  163
  169. #define KEY_PLAYPAUSE  164
  170. #define KEY_PREVIOUSSONG 165
  171. #define KEY_STOPCD  166
  172. #define KEY_RECORD  167
  173. #define KEY_REWIND  168
  174. #define KEY_PHONE  169 /* Media Select Telephone */
  175. #define KEY_ISO   170
  176. #define KEY_CONFIG  171 /* AL Consumer Control Configuration */
  177. #define KEY_HOMEPAGE  172 /* AC Home */
  178. #define KEY_REFRESH  173 /* AC Refresh */
  179. #define KEY_EXIT  174 /* AC Exit */
  180. #define KEY_MOVE  175
  181. #define KEY_EDIT  176
  182. #define KEY_SCROLLUP  177
  183. #define KEY_SCROLLDOWN  178
  184. #define KEY_KPLEFTPAREN  179
  185. #define KEY_KPRIGHTPAREN 180
  186. #define KEY_NEW   181 /* AC New */
  187. #define KEY_REDO  182 /* AC Redo/Repeat */
  188.  
  189. #define KEY_F13   183
  190. #define KEY_F14   184
  191. #define KEY_F15   185
  192. #define KEY_F16   186
  193. #define KEY_F17   187
  194. #define KEY_F18   188
  195. #define KEY_F19   189
  196. #define KEY_F20   190
  197. #define KEY_F21   191
  198. #define KEY_F22   192
  199. #define KEY_F23   193
  200. #define KEY_F24   194
  201.  
  202. #define KEY_PLAYCD  200
  203. #define KEY_PAUSECD  201
  204. #define KEY_PROG3  202
  205. #define KEY_PROG4  203
  206. #define KEY_DASHBOARD  204 /* AL Dashboard */
  207. #define KEY_SUSPEND  205
  208. #define KEY_CLOSE  206 /* AC Close */
  209. #define KEY_PLAY  207
  210. #define KEY_FASTFORWARD  208
  211. #define KEY_BASSBOOST  209
  212. #define KEY_PRINT  210 /* AC Print */
  213. #define KEY_HP   211
  214. #define KEY_CAMERA  212
  215. #define KEY_SOUND  213
  216. #define KEY_QUESTION  214
  217. #define KEY_EMAIL  215
  218. #define KEY_CHAT  216
  219. #define KEY_SEARCH  217
  220. #define KEY_CONNECT  218
  221. #define KEY_FINANCE  219 /* AL Checkbook/Finance */
  222. #define KEY_SPORT  220
  223. #define KEY_SHOP  221
  224. #define KEY_ALTERASE  222
  225. #define KEY_CANCEL  223 /* AC Cancel */
  226. #define KEY_BRIGHTNESSDOWN 224
  227. #define KEY_BRIGHTNESSUP 225
  228. #define KEY_MEDIA  226
  229.  
  230. #define KEY_SWITCHVIDEOMODE 227 /* Cycle between available video
  231.         outputs (Monitor/LCD/TV-out/etc) */
  232. #define KEY_KBDILLUMTOGGLE 228
  233. #define KEY_KBDILLUMDOWN 229
  234. #define KEY_KBDILLUMUP  230
  235.  
  236. #define KEY_SEND  231 /* AC Send */
  237. #define KEY_REPLY  232 /* AC Reply */
  238. #define KEY_FORWARDMAIL  233 /* AC Forward Msg */
  239. #define KEY_SAVE  234 /* AC Save */
  240. #define KEY_DOCUMENTS  235
  241.  
  242. #define KEY_BATTERY  236
  243.  
  244. #define KEY_BLUETOOTH  237
  245. #define KEY_WLAN  238
  246. #define KEY_UWB   239
  247.  
  248. #define KEY_UNKNOWN  240
  249.  
  250. #define KEY_VIDEO_NEXT  241 /* drive next video source */
  251. #define KEY_VIDEO_PREV  242 /* drive previous video source */
  252. #define KEY_BRIGHTNESS_CYCLE 243 /* brightness up, after max is min */
  253. #define KEY_BRIGHTNESS_AUTO 244 /* Set Auto Brightness: manual
  254.        brightness control is off,
  255.        rely on ambient */
  256. #define KEY_BRIGHTNESS_ZERO KEY_BRIGHTNESS_AUTO
  257. #define KEY_DISPLAY_OFF  245 /* display device to off state */
  258.  
  259. #define KEY_WWAN  246 /* Wireless WAN (LTE, UMTS, GSM, etc.) */
  260. #define KEY_WIMAX  KEY_WWAN
  261. #define KEY_RFKILL  247 /* Key that controls all radios */
  262.  
  263. #define KEY_MICMUTE  248 /* Mute / unmute the microphone */
  264.  
  265. /* Code 255 is reserved for special needs of AT keyboard driver */
 
可通过 getevent 指令查看上报的键值，键值为十六进制显示：
 

　　首先要确定按键输入设备是对应/dev/input目录下哪个event，根据VID PID匹配对应的kl文件，可通过如下命令 cat /proc/bus/input/devices 查看设备信息：

  1. shell@flo:/ $ cat /proc/bus/input/devices
  2. I: Bus= Vendor= Product= Version=
  3. N: Name="elan-touchscreen"
  4. P: Phys=
  5. S: Sysfs=/devices/virtual/input/input0
  6. U: Uniq=
  7. H: Handlers=event0 cpufreq
  8. B: PROP=
  9. B: EV=b
  10. B: KEY=
  11. B: ABS= 
  12.  
  13. I: Bus= Vendor= Product= Version=
  14. N: Name="lid_input"
  15. P: Phys=/dev/input/lid_indev
  16. S: Sysfs=/devices/virtual/input/input1
  17. U: Uniq=
  18. H: Handlers=event1 cpufreq
  19. B: PROP=
  20. B: EV=
  21. B: SW=
  22.  
  23. I: Bus= Vendor= Product= Version=
  24. N: Name="apq8064-tabla-snd-card Button Jack"
  25. P: Phys=ALSA
  26. S: Sysfs=/devices/platform/soc-audio./sound/card0/input2
  27. U: Uniq=
  28. H: Handlers=event2 cpufreq
  29. B: PROP=
  30. B: EV=
  31. B: KEY=ff        
  32.  
  33. I: Bus= Vendor= Product= Version=
  34. N: Name="apq8064-tabla-snd-card Headset Jack"
  35. P: Phys=ALSA
  36. S: Sysfs=/devices/platform/soc-audio./sound/card0/input3
  37. U: Uniq=
  38. H: Handlers=event3 cpufreq
  39. B: PROP=
  40. B: EV=
  41. B: SW=1c054
  42.  
  43. I: Bus= Vendor= Product= Version=
  44. N: Name="h2w button"
  45. P: Phys=
  46. S: Sysfs=/devices/virtual/input/input4
  47. U: Uniq=
  48. H: Handlers=kbd event4 cpufreq
  49. B: PROP=
  50. B: EV=
  51. B: KEY=       
  52.  
  53. I: Bus= Vendor= Product= Version=
  54. N: Name="gpio-keys"
  55. P: Phys=gpio-keys/input0
  56. S: Sysfs=/devices/platform/gpio-keys./input/input5
  57. U: Uniq=
  58. H: Handlers=kbd event5 keychord cpufreq
  59. B: PROP=
  60. B: EV=
  61. B: KEY=1c0000   
  62.  
  63. I: Bus= Vendor= Product=001D Version=
  64. N: Name="Smart Remote"
  65. P: Phys=
  66. S: Sysfs=/devices/virtual/misc/uhid/input7
  67. U: Uniq=
  68. H: Handlers=sysrq kbd event6 keychord cpufreq
  69. B: PROP=
  70. B: EV=10001f
  71. B: KEY=4837fff 72ff32d bf544446    30f90 8b17c007 ffff7bfa d9415fff febeffdf ffefffff ffffffff fffffffe
  72. B: REL=
  73. B: ABS=
  74. B: MSC=

　　如上我的设备名是："Smart Remote"  ， VID PID信息是：Vendor=0030 Product=001D ,则对应 /system/usr/keylayout/Vendor_0030_Product_001D.kl,如果该目录下没有对应VID PID的.kl则默认使用 Generic.kl，根据系统差异可能另外有 /data/system/devices/keylayout/Vendor_XXXX_Product_XXXX_Version_XXXX.kl ，此外还有键值对应字符的转换表：/system/usr/keychars/Generic.kcm 。

所以上面通过getevent获得的原始键值是0x44(十进制：68)，然后由 hid-input.c 可知 hid_keyboard[68]=87 而 input.h 中定义是 #define KEY_F11 87，所以Android系统层获取到内核转换后的键值为<87>，然后通过加载Generic.kl解析<87>的含义是"F11"（一般都是和内核头文件定义相匹配，也可以自己修改使其映射成其他含义）:

  1. #
  2. # Generic key layout file for full alphabetic US English PC style external keyboards.
  3. #
  4. # This file is intentionally very generic and is intended to support a broad rang of keyboards.
  5. # Do not edit the generic key layout to support a specific keyboard; instead, create
  6. # a new key layout file with the required keyboard configuration.
  7. #
  8.  
  9. key      ESCAPE
  10. key
  11. key
  12. key
  13. key
  14. key
  15. key
  16. key
  17. key
  18. key
  19. key
  20. key     MINUS
  21. key     EQUALS
  22. key     DEL
  23. key     TAB
  24. key     Q
  25. key     W
  26. key     E
  27. key     R
  28. key     T
  29. key     Y
  30. key     U
  31. key     I
  32. key     O
  33. key     P
  34. key     LEFT_BRACKET
  35. key     RIGHT_BRACKET
  36. key     ENTER
  37. key     CTRL_LEFT
  38. key     A
  39. key     S
  40. key     D
  41. key     F
  42. key     G
  43. key     H
  44. key     J
  45. key     K
  46. key     L
  47. key     SEMICOLON
  48. key     APOSTROPHE
  49. key     GRAVE
  50. key     SHIFT_LEFT
  51. key     BACKSLASH
  52. key     Z
  53. key     X
  54. key     C
  55. key     V
  56. key     B
  57. key     N
  58. key     M
  59. key     COMMA
  60. key     PERIOD
  61. key     SLASH
  62. key     SHIFT_RIGHT
  63. key     NUMPAD_MULTIPLY
  64. key     ALT_LEFT
  65. key     SPACE
  66. key     CAPS_LOCK
  67. key     F1
  68. key     F2
  69. key     F3
  70. key     F4
  71. key     F5
  72. key     F6
  73. key     F7
  74. key     F8
  75. key     F9
  76. key     F10
  77. key     NUM_LOCK
  78. key     SCROLL_LOCK
  79. key     NUMPAD_7
  80. key     NUMPAD_8
  81. key     NUMPAD_9
  82. key     NUMPAD_SUBTRACT
  83. key     NUMPAD_4
  84. key     NUMPAD_5
  85. key     NUMPAD_6
  86. key     NUMPAD_ADD
  87. key     NUMPAD_1
  88. key     NUMPAD_2
  89. key     NUMPAD_3
  90. key     NUMPAD_0
  91. key     NUMPAD_DOT
  92. # key  (undefined)
  93. key     ZENKAKU_HANKAKU
  94. key     BACKSLASH
  95. key     F11
  96. key     F12
  97. key     RO
  98. # key  "KEY_KATAKANA"
  99. # key  "KEY_HIRAGANA"
  100. key     HENKAN
  101. key     KATAKANA_HIRAGANA
  102. key     MUHENKAN
  103. key     NUMPAD_COMMA
  104. key     NUMPAD_ENTER
  105. key     CTRL_RIGHT
  106. key     NUMPAD_DIVIDE
  107. key     SYSRQ
  108. key    ALT_RIGHT
  109. # key  "KEY_LINEFEED"
  110. key    MOVE_HOME
  111. key    DPAD_UP
  112. key    PAGE_UP
  113. key    DPAD_LEFT
  114. key    DPAD_RIGHT
  115. key    MOVE_END
  116. key    DPAD_DOWN
  117. key    PAGE_DOWN
  118. key    INSERT
  119. key    FORWARD_DEL
  120. # key  "KEY_MACRO"
  121. key    VOLUME_MUTE
  122. key    VOLUME_DOWN
  123. key    VOLUME_UP
  124. key    POWER             WAKE
  125. key    NUMPAD_EQUALS
  126. # key  "KEY_KPPLUSMINUS"
  127. key    BREAK
  128. # key  (undefined)
  129. key    NUMPAD_COMMA
  130. key    KANA
  131. key    EISU
  132. key    YEN
  133. key    META_LEFT
  134. key    META_RIGHT
  135. key    MENU              WAKE_DROPPED
  136. key    MEDIA_STOP
  137. # key  "KEY_AGAIN"
  138. # key  "KEY_PROPS"
  139. # key  "KEY_UNDO"
  140. # key  "KEY_FRONT"
  141. # key  "KEY_COPY"
  142. # key  "KEY_OPEN"
  143. # key  "KEY_PASTE"
  144. # key  "KEY_FIND"
  145. # key  "KEY_CUT"
  146. # key  "KEY_HELP"
  147. key    MENU              WAKE_DROPPED
  148. key    CALCULATOR
  149. # key  "KEY_SETUP"
  150. key    POWER             WAKE
  151. key    POWER             WAKE
  152. # key  "KEY_FILE"
  153. # key  "KEY_SENDFILE"
  154. # key  "KEY_DELETEFILE"
  155. # key  "KEY_XFER"
  156. # key  "KEY_PROG1"
  157. # key  "KEY_PROG2"
  158. key    EXPLORER
  159. # key  "KEY_MSDOS"
  160. key    POWER             WAKE
  161. # key  "KEY_DIRECTION"
  162. # key  "KEY_CYCLEWINDOWS"
  163. key    ENVELOPE
  164. key    BOOKMARK
  165. # key  "KEY_COMPUTER"
  166. key    BACK              WAKE_DROPPED
  167. key    FORWARD
  168. key    MEDIA_CLOSE
  169. key    MEDIA_EJECT
  170. key    MEDIA_EJECT
  171. key    MEDIA_NEXT
  172. key    MEDIA_PLAY_PAUSE
  173. key    MEDIA_PREVIOUS
  174. key    MEDIA_STOP
  175. key    MEDIA_RECORD
  176. key    MEDIA_REWIND
  177. key    CALL
  178. # key  "KEY_ISO"
  179. key    MUSIC
  180. key    HOME
  181. # key  "KEY_REFRESH"
  182. # key  "KEY_EXIT"
  183. # key  "KEY_MOVE"
  184. # key  "KEY_EDIT"
  185. key    PAGE_UP
  186. key    PAGE_DOWN
  187. key    NUMPAD_LEFT_PAREN
  188. key    NUMPAD_RIGHT_PAREN
  189. # key  "KEY_NEW"
  190. # key  "KEY_REDO"
  191. # key    F13
  192. # key    F14
  193. # key    F15
  194. # key    F16
  195. # key    F17
  196. # key    F18
  197. # key    F19
  198. # key    F20
  199. # key    F21
  200. # key    F22
  201. # key    F23
  202. # key    F24
  203. # key  (undefined)
  204. # key  (undefined)
  205. # key  (undefined)
  206. # key  (undefined)
  207. # key  (undefined)
  208. key    MEDIA_PLAY
  209. key    MEDIA_PAUSE
  210. # key  "KEY_PROG3"
  211. # key  "KEY_PROG4"
  212. # key  (undefined)
  213. # key  "KEY_SUSPEND"
  214. # key  "KEY_CLOSE"
  215. key    MEDIA_PLAY
  216. key    MEDIA_FAST_FORWARD
  217. # key  "KEY_BASSBOOST"
  218. # key  "KEY_PRINT"
  219. # key  "KEY_HP"
  220. key    CAMERA
  221. key    MUSIC
  222. # key  "KEY_QUESTION"
  223. key    ENVELOPE
  224. # key  "KEY_CHAT"
  225. key    SEARCH
  226. # key  "KEY_CONNECT"
  227. # key  "KEY_FINANCE"
  228. # key  "KEY_SPORT"
  229. # key  "KEY_SHOP"
  230. # key  "KEY_ALTERASE"
  231. # key  "KEY_CANCEL"
  232. key    BRIGHTNESS_DOWN
  233. key    BRIGHTNESS_UP
  234. key    HEADSETHOOK
  235.  
  236. key    BUTTON_1
  237. key    BUTTON_2
  238. key    BUTTON_3
  239. key    BUTTON_4
  240. key    BUTTON_5
  241. key    BUTTON_6
  242. key    BUTTON_7
  243. key    BUTTON_8
  244. key    BUTTON_9
  245. key    BUTTON_10
  246. key    BUTTON_11
  247. key    BUTTON_12
  248. key    BUTTON_13
  249. key    BUTTON_14
  250. key    BUTTON_15
  251. key    BUTTON_16
  252.  
  253. key    BUTTON_1
  254. key    BUTTON_2
  255. key    BUTTON_3
  256. key    BUTTON_4
  257. key    BUTTON_5
  258. key    BUTTON_6
  259. key    BUTTON_7
  260. key    BUTTON_8
  261. key    BUTTON_9
  262. key    BUTTON_10
  263. key    BUTTON_11
  264. key    BUTTON_12
  265. key    BUTTON_13
  266. key    BUTTON_14
  267. key    BUTTON_15
  268. key    BUTTON_16
  269.  
  270. key    BUTTON_A
  271. key    BUTTON_B
  272. key    BUTTON_C
  273. key    BUTTON_X
  274. key    BUTTON_Y
  275. key    BUTTON_Z
  276. key    BUTTON_L1
  277. key    BUTTON_R1
  278. key    BUTTON_L2
  279. key    BUTTON_R2
  280. key    BUTTON_SELECT
  281. key    BUTTON_START
  282. key    BUTTON_MODE
  283. key    BUTTON_THUMBL
  284. key    BUTTON_THUMBR
  285.  
  286. # key  "KEY_OK"
  287. key    DPAD_CENTER
  288. # key  "KEY_GOTO"
  289. # key  "KEY_CLEAR"
  290. # key  "KEY_POWER2"
  291. # key  "KEY_OPTION"
  292. # key  "KEY_INFO"
  293. # key  "KEY_TIME"
  294. # key  "KEY_VENDOR"
  295. # key  "KEY_ARCHIVE"
  296. key    GUIDE
  297. # key  "KEY_CHANNEL"
  298. # key  "KEY_FAVORITES"
  299. # key  "KEY_EPG"
  300. key    DVR
  301. # key  "KEY_MHP"
  302. # key  "KEY_LANGUAGE"
  303. # key  "KEY_TITLE"
  304. # key  "KEY_SUBTITLE"
  305. # key  "KEY_ANGLE"
  306. # key  "KEY_ZOOM"
  307. # key  "KEY_MODE"
  308. # key  "KEY_KEYBOARD"
  309. # key  "KEY_SCREEN"
  310. # key  "KEY_PC"
  311. key    TV
  312. # key  "KEY_TV2"
  313. # key  "KEY_VCR"
  314. # key  "KEY_VCR2"
  315. # key  "KEY_SAT"
  316. # key  "KEY_SAT2"
  317. # key  "KEY_CD"
  318. # key  "KEY_TAPE"
  319. # key  "KEY_RADIO"
  320. # key  "KEY_TUNER"
  321. # key  "KEY_PLAYER"
  322. # key  "KEY_TEXT"
  323. # key  "KEY_DVD"
  324. # key  "KEY_AUX"
  325. # key  "KEY_MP3"
  326. # key  "KEY_AUDIO"
  327. # key  "KEY_VIDEO"
  328. # key  "KEY_DIRECTORY"
  329. # key  "KEY_LIST"
  330. # key  "KEY_MEMO"
  331. key    CALENDAR
  332. # key  "KEY_RED"
  333. # key  "KEY_GREEN"
  334. # key  "KEY_YELLOW"
  335. # key  "KEY_BLUE"
  336. key    CHANNEL_UP
  337. key    CHANNEL_DOWN
  338. # key  "KEY_FIRST"
  339. # key  "KEY_LAST"
  340. # key  "KEY_AB"
  341. # key  "KEY_NEXT"
  342. # key  "KEY_RESTART"
  343. # key  "KEY_SLOW"
  344. # key  "KEY_SHUFFLE"
  345. # key  "KEY_BREAK"
  346. # key  "KEY_PREVIOUS"
  347. # key  "KEY_DIGITS"
  348. # key  "KEY_TEEN"
  349. # key  "KEY_TWEN"
  350.  
  351. key    CONTACTS
  352.  
  353. # key  "KEY_DEL_EOL"
  354. # key  "KEY_DEL_EOS"
  355. # key  "KEY_INS_LINE"
  356. # key  "KEY_DEL_LINE"
  357.  
  358. key    FUNCTION
  359. key    ESCAPE            FUNCTION
  360. key    F1                FUNCTION
  361. key    F2                FUNCTION
  362. key    F3                FUNCTION
  363. key    F4                FUNCTION
  364. key    F5                FUNCTION
  365. key    F6                FUNCTION
  366. key    F7                FUNCTION
  367. key    F8                FUNCTION
  368. key    F9                FUNCTION
  369. key    F10               FUNCTION
  370. key    F11               FUNCTION
  371. key    F12               FUNCTION
  372. key                     FUNCTION
  373. key                     FUNCTION
  374. key    D                 FUNCTION
  375. key    E                 FUNCTION
  376. key    F                 FUNCTION
  377. key    S                 FUNCTION
  378. key    B                 FUNCTION
  379.  
  380. # key  KEY_BRL_DOT1
  381. # key  KEY_BRL_DOT2
  382. # key  KEY_BRL_DOT3
  383. # key  KEY_BRL_DOT4
  384. # key  KEY_BRL_DOT5
  385. # key  KEY_BRL_DOT6
  386. # key  KEY_BRL_DOT7
  387. # key  KEY_BRL_DOT8
  388.  
  389. # Keys defined by HID usages
  390. key usage 0x0c006F BRIGHTNESS_UP
  391. key usage 0x0c0070 BRIGHTNESS_DOWN
  392.  
  393. # Joystick and game controller axes.
  394. # Axes that are not mapped will be assigned generic axis numbers by the input subsystem.
  395. axis 0x00 X
  396. axis 0x01 Y
  397. axis 0x02 Z
  398. axis 0x03 RX
  399. axis 0x04 RY
  400. axis 0x05 RZ
  401. axis 0x06 THROTTLE
  402. axis 0x07 RUDDER
  403. axis 0x08 WHEEL
  404. axis 0x09 GAS
  405. axis 0x0a BRAKE
  406. axis 0x10 HAT_X
  407. axis 0x11 HAT_Y

键值从底层上报到上层的流程简图如下：

　　　　　　图2：键值上报流程

　　从上图可以看到，framework层通过.kl文件将获取的键值转换成实际按键含义后，又会通过KeycodeLabel转换成相应的keycode,具体文件在：frameworks\native\include\input\KeycodeLabels.h(android 4.4.4源码)：

  1. /*
  2.  * Copyright (C) 2008 The Android Open Source Project
  3.  *
  4.  * Licensed under the Apache License, Version 2.0 (the "License");
  5.  * you may not use this file except in compliance with the License.
  6.  * You may obtain a copy of the License at
  7.  *
  8.  *      http://www.apache.org/licenses/LICENSE-2.0
  9.  *
  10.  * Unless required by applicable law or agreed to in writing, software
  11.  * distributed under the License is distributed on an "AS IS" BASIS,
  12.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13.  * See the License for the specific language governing permissions and
  14.  * limitations under the License.
  15.  */
  16.  
  17. #ifndef _LIBINPUT_KEYCODE_LABELS_H
  18. #define _LIBINPUT_KEYCODE_LABELS_H
  19.  
  20. #include <android/keycodes.h>
  21.  
  22. struct KeycodeLabel {
  23.     const char *literal;
  24.     int value;
  25. };
  26.  
  27. static const KeycodeLabel KEYCODES[] = {
  28.     { "SOFT_LEFT",  },
  29.     { "SOFT_RIGHT",  },
  30.     { "HOME",  },
  31.     { "BACK",  },
  32.     { "CALL",  },
  33.     { "ENDCALL",  },
  34.     { "",  },
  35.     { "",  },
  36.     { "",  },
  37.     { "",  },
  38.     { "",  },
  39.     { "",  },
  40.     { "",  },
  41.     { "",  },
  42.     { "",  },
  43.     { "",  },
  44.     { "STAR",  },
  45.     { "POUND",  },
  46.     { "DPAD_UP",  },
  47.     { "DPAD_DOWN",  },
  48.     { "DPAD_LEFT",  },
  49.     { "DPAD_RIGHT",  },
  50.     { "DPAD_CENTER",  },
  51.     { "VOLUME_UP",  },
  52.     { "VOLUME_DOWN",  },
  53.     { "POWER",  },
  54.     { "CAMERA",  },
  55.     { "CLEAR",  },
  56.     { "A",  },
  57.     { "B",  },
  58.     { "C",  },
  59.     { "D",  },
  60.     { "E",  },
  61.     { "F",  },
  62.     { "G",  },
  63.     { "H",  },
  64.     { "I",  },
  65.     { "J",  },
  66.     { "K",  },
  67.     { "L",  },
  68.     { "M",  },
  69.     { "N",  },
  70.     { "O",  },
  71.     { "P",  },
  72.     { "Q",  },
  73.     { "R",  },
  74.     { "S",  },
  75.     { "T",  },
  76.     { "U",  },
  77.     { "V",  },
  78.     { "W",  },
  79.     { "X",  },
  80.     { "Y",  },
  81.     { "Z",  },
  82.     { "COMMA",  },
  83.     { "PERIOD",  },
  84.     { "ALT_LEFT",  },
  85.     { "ALT_RIGHT",  },
  86.     { "SHIFT_LEFT",  },
  87.     { "SHIFT_RIGHT",  },
  88.     { "TAB",  },
  89.     { "SPACE",  },
  90.     { "SYM",  },
  91.     { "EXPLORER",  },
  92.     { "ENVELOPE",  },
  93.     { "ENTER",  },
  94.     { "DEL",  },
  95.     { "GRAVE",  },
  96.     { "MINUS",  },
  97.     { "EQUALS",  },
  98.     { "LEFT_BRACKET",  },
  99.     { "RIGHT_BRACKET",  },
  100.     { "BACKSLASH",  },
  101.     { "SEMICOLON",  },
  102.     { "APOSTROPHE",  },
  103.     { "SLASH",  },
  104.     { "AT",  },
  105.     { "NUM",  },
  106.     { "HEADSETHOOK",  },
  107.     { "FOCUS",  },
  108.     { "PLUS",  },
  109.     { "MENU",  },
  110.     { "NOTIFICATION",  },
  111.     { "SEARCH",  },
  112.     { "MEDIA_PLAY_PAUSE",  },
  113.     { "MEDIA_STOP",  },
  114.     { "MEDIA_NEXT",  },
  115.     { "MEDIA_PREVIOUS",  },
  116.     { "MEDIA_REWIND",  },
  117.     { "MEDIA_FAST_FORWARD",  },
  118.     { "MUTE",  },
  119.     { "PAGE_UP",  },
  120.     { "PAGE_DOWN",  },
  121.     { "PICTSYMBOLS",  },
  122.     { "SWITCH_CHARSET",  },
  123.     { "BUTTON_A",  },
  124.     { "BUTTON_B",  },
  125.     { "BUTTON_C",  },
  126.     { "BUTTON_X",  },
  127.     { "BUTTON_Y",  },
  128.     { "BUTTON_Z",  },
  129.     { "BUTTON_L1",  },
  130.     { "BUTTON_R1",  },
  131.     { "BUTTON_L2",  },
  132.     { "BUTTON_R2",  },
  133.     { "BUTTON_THUMBL",  },
  134.     { "BUTTON_THUMBR",  },
  135.     { "BUTTON_START",  },
  136.     { "BUTTON_SELECT",  },
  137.     { "BUTTON_MODE",  },
  138.     { "ESCAPE",  },
  139.     { "FORWARD_DEL",  },
  140.     { "CTRL_LEFT",  },
  141.     { "CTRL_RIGHT",  },
  142.     { "CAPS_LOCK",  },
  143.     { "SCROLL_LOCK",  },
  144.     { "META_LEFT",  },
  145.     { "META_RIGHT",  },
  146.     { "FUNCTION",  },
  147.     { "SYSRQ",  },
  148.     { "BREAK",  },
  149.     { "MOVE_HOME",  },
  150.     { "MOVE_END",  },
  151.     { "INSERT",  },
  152.     { "FORWARD",  },
  153.     { "MEDIA_PLAY",  },
  154.     { "MEDIA_PAUSE",  },
  155.     { "MEDIA_CLOSE",  },
  156.     { "MEDIA_EJECT",  },
  157.     { "MEDIA_RECORD",  },
  158.     { "F1",  },
  159.     { "F2",  },
  160.     { "F3",  },
  161.     { "F4",  },
  162.     { "F5",  },
  163.     { "F6",  },
  164.     { "F7",  },
  165.     { "F8",  },
  166.     { "F9",  },
  167.     { "F10",  },
  168.     //{ "F11", 141 },
  169.     { "F11",  },
  170.     { "F12",  },
  171.     { "NUM_LOCK",  },
  172.     { "NUMPAD_0",  },
  173.     { "NUMPAD_1",  },
  174.     { "NUMPAD_2",  },
  175.     { "NUMPAD_3",  },
  176.     { "NUMPAD_4",  },
  177.     { "NUMPAD_5",  },
  178.     { "NUMPAD_6",  },
  179.     { "NUMPAD_7",  },
  180.     { "NUMPAD_8",  },
  181.     { "NUMPAD_9",  },
  182.     { "NUMPAD_DIVIDE",  },
  183.     { "NUMPAD_MULTIPLY",  },
  184.     { "NUMPAD_SUBTRACT",  },
  185.     { "NUMPAD_ADD",  },
  186.     { "NUMPAD_DOT",  },
  187.     { "NUMPAD_COMMA",  },
  188.     { "NUMPAD_ENTER",  },
  189.     { "NUMPAD_EQUALS",  },
  190.     { "NUMPAD_LEFT_PAREN",  },
  191.     { "NUMPAD_RIGHT_PAREN",  },
  192.     { "VOLUME_MUTE",  },
  193.     { "INFO",  },
  194.     { "CHANNEL_UP",  },
  195.     { "CHANNEL_DOWN",  },
  196.     { "ZOOM_IN",  },
  197.     { "ZOOM_OUT",  },
  198.     { "TV",  },
  199.     { "WINDOW",  },
  200.     { "GUIDE",  },
  201.     { "DVR",  },
  202.     { "BOOKMARK",  },
  203.     { "CAPTIONS",  },
  204.     { "SETTINGS",  },
  205.     { "TV_POWER",  },
  206.     { "TV_INPUT",  },
  207.     { "STB_POWER",  },
  208.     { "STB_INPUT",  },
  209.     { "AVR_POWER",  },
  210.     { "AVR_INPUT",  },
  211.     { "PROG_RED",  },
  212.     { "PROG_GREEN",  },
  213.     { "PROG_YELLOW",  },
  214.     { "PROG_BLUE",  },
  215.     { "APP_SWITCH",  },
  216.     { "BUTTON_1",  },
  217.     { "BUTTON_2",  },
  218.     { "BUTTON_3",  },
  219.     { "BUTTON_4",  },
  220.     { "BUTTON_5",  },
  221.     { "BUTTON_6",  },
  222.     { "BUTTON_7",  },
  223.     { "BUTTON_8",  },
  224.     { "BUTTON_9",  },
  225.     { "BUTTON_10",  },
  226.     { "BUTTON_11",  },
  227.     { "BUTTON_12",  },
  228.     { "BUTTON_13",  },
  229.     { "BUTTON_14",  },
  230.     { "BUTTON_15",  },
  231.     { "BUTTON_16",  },
  232.     { "LANGUAGE_SWITCH",  },
  233.     { "MANNER_MODE",  },
  234.     { "3D_MODE",  },
  235.     { "CONTACTS",  },
  236.     { "CALENDAR",  },
  237.     { "MUSIC",  },
  238.     { "CALCULATOR",  },
  239.     { "ZENKAKU_HANKAKU",  },
  240.     { "EISU",  },
  241.     { "MUHENKAN",  },
  242.     { "HENKAN",  },
  243.     { "KATAKANA_HIRAGANA",  },
  244.     { "YEN",  },
  245.     { "RO",  },
  246.     { "KANA",  },
  247.     { "ASSIST",  },
  248.     { "BRIGHTNESS_DOWN",  },
  249.     { "BRIGHTNESS_UP",  },
  250.     { "MEDIA_AUDIO_TRACK",  },
  251.  
  252.     // NOTE: If you add a new keycode here you must also add it to several other files.
  253.     //       Refer to frameworks/base/core/java/android/view/KeyEvent.java for the full list.
  254.  
  255.     { NULL,  }
  256. };
  257.  
  258. // NOTE: If you edit these flags, also edit policy flags in Input.h.
  259. static const KeycodeLabel FLAGS[] = {
  260.     { "WAKE", 0x00000001 },
  261.     { "WAKE_DROPPED", 0x00000002 },
  262.     { "SHIFT", 0x00000004 },
  263.     { "CAPS_LOCK", 0x00000008 },
  264.     { "ALT", 0x00000010 },
  265.     { "ALT_GR", 0x00000020 },
  266.     { "MENU", 0x00000040 },
  267.     { "LAUNCHER", 0x00000080 },
  268.     { "VIRTUAL", 0x00000100 },
  269.     { "FUNCTION", 0x00000200 },
  270.     { NULL,  }
  271. };
  272.  
  273. static const KeycodeLabel AXES[] = {
  274.     { "X",  },
  275.     { "Y",  },
  276.     { "PRESSURE",  },
  277.     { "SIZE",  },
  278.     { "TOUCH_MAJOR",  },
  279.     { "TOUCH_MINOR",  },
  280.     { "TOOL_MAJOR",  },
  281.     { "TOOL_MINOR",  },
  282.     { "ORIENTATION",  },
  283.     { "VSCROLL",  },
  284.     { "HSCROLL",  },
  285.     { "Z",  },
  286.     { "RX",  },
  287.     { "RY",  },
  288.     { "RZ",  },
  289.     { "HAT_X",  },
  290.     { "HAT_Y",  },
  291.     { "LTRIGGER",  },
  292.     { "RTRIGGER",  },
  293.     { "THROTTLE",  },
  294.     { "RUDDER",  },
  295.     { "WHEEL",  },
  296.     { "GAS",  },
  297.     { "BRAKE",  },
  298.     { "DISTANCE",  },
  299.     { "TILT",  },
  300.     { "GENERIC_1",  },
  301.     { "GENERIC_2",  },
  302.     { "GENERIC_3",  },
  303.     { "GENERIC_4",  },
  304.     { "GENERIC_5",  },
  305.     { "GENERIC_6",  },
  306.     { "GENERIC_7",  },
  307.     { "GENERIC_8",  },
  308.     { "GENERIC_9",  },
  309.     { "GENERIC_10",  },
  310.     { "GENERIC_11",  },
  311.     { "GENERIC_12",  },
  312.     { "GENERIC_13",  },
  313.     { "GENERIC_14",  },
  314.     { "GENERIC_15",  },
  315.     { "GENERIC_16",  },
  316.  
  317.     // NOTE: If you add a new axis here you must also add it to several other files.
  318.     //       Refer to frameworks/base/core/java/android/view/MotionEvent.java for the full list.
  319.  
  320.     { NULL, - }
  321. };
  322.  
  323. #endif // _LIBINPUT_KEYCODE_LABELS_H

然后app可以通过如下方法获得对应键按下时的keyCode值，即“F11”对应获得的keyCode即为上面自定义的<546>：

  1.     public boolean onKeyDown(int keyCode, KeyEvent event) { //重写的键盘按下监听
  2.         alert("获取系统keyCode : "+ keyCode);
  3.         return super.onKeyDown(keyCode, event);
  4.     }

 三、添加自定义的键值：

（1）Kernel层：

　　　　① include/uapi/linux/input.h 中添加: #define KEY_LXL               123
　　　　② drivers/hid/hid-input.c 中添加:                case 0x188: map_key_clear(KEY_LXL);      break;   //其中0x188是HID设备上报的原始键值


（2）Android系统层：

　　① bionic/libc/kernel/uapi/linux/input-event-codes.h 中添加  ： #define KEY_LXL               123    //与kernel中头文件定义一致
　　② Generic.kl或Vendor_xxxx_Product_xxxx.kl文件中添加      ：  key 123 LXL;
　　 ③ /frameworks/native/include/android/keycodes.h  中添加  ：  AKEYCODE_LXL          = 666，
　　 ④ /frameworks/native/include/input/KeycodeLabels.h 的KEYCODES[]数组中添加： { "LXL", 666 },
　　 ⑤ 在frameworks/base/core/res/res/values/attrs.xml 中添加 ：  <enum name="KEYCODE_LXL" value="666" />
　　 ⑥ 在frameworks/base/core/java/android/view/KeyEvent.java添加： public static final int KEYCODE_LXL= 666;

      
       经过如上的步骤就将Linux驱动向上层抛出的"123"键值和Android系统中的KEYCODE_LXL <666>对应起来了，然后可以在Android的framework层的键值处理函数中，捕获按键事件，并进行相应自定义处理，具体在frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java 的interceptKeyBeforeQueueing()函数中实现。

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