Android下添加新的自定义键值和按键处理流程

Android下添加新的自定义键值和按键处理流程
说出来不怕大家笑话，我写这篇博客的原因在于前几天去一个小公司面试Android系统工程师，然后在面试的时候对方的技术总监问了我一个问题，请你详细描述一下怎么在Android下添加自定义键值和详细描述下Android的按键处理流程。现在回想起来当时回答的确实不是很好，乘着现在比较空闲的时机就来分析下上述的两个问题。
首先分析下Android下怎么添加新的自定义键值。在Android的原生系统中键值默认情况下是92个，从0-91；一般情况下，这些键值是够用的，但是如果想扩充的话，还是需要添加新的键值的，那么如何将一个新的键值从驱动的设置映射到上层，使应用可以对我们自定义的键值进行相应的处理呢？在介绍Android怎么添加新的键值以前先介绍下Android下INPUT子系统FLOW的流程，下面就是精简的流程图示意图： Android下添加新的自定义键值和按键处理流程_第1张图片

1.添加按键及其映射 1)如果系统有新的按键需要添加，玛门是怎么添加并上报到系统上层去的呢(这里的上层主要指的是Android应用层)，首先要确定的是我们的遥控设备是通过/dev/input目录下那个event调用那个kl文件，这里可以通过如下命令超看cat /proc/bus/input/devices,下面是在终端下的打印信息

<span style="font-family:FangSong_GB2312;font-size:18px;">shell@orange:/ # cat /proc/bus/input/devices I: Bus=0018 Vendor=3697 Product=0001 Version=0001N: Name="MStar Smart TV IR Receiver"P: Phys=/dev/irS: Sysfs=/devices/virtual/rc/rc0/input0U: Uniq=H: Handlers=kbd event0 B: PROP=0B: EV=13B: KEY=fc0000 0 fc900 142851 0 0 0 0 108000 1a8 c0000c01 9e37c0 48007 f8000000 10000ffcB: MSC=10I: Bus=0000 Vendor=0000 Product=0000 Version=0000N: Name="MCE IR Keyboard/Mouse (ir)"P: Phys=/input0S: Sysfs=/devices/virtual/input/input1U: Uniq=H: Handlers=kbd mouse0 event1 B: PROP=0B: EV=100017B: KEY=30000 0 7 ff87207a c14057ff febeffdf ffefffff ffffffff fffffffeB: REL=3B: MSC=10shell@orange:/ # shell@orange:/ # </span>

通过打印信息我们可以知道，我们的终端设备使用的是Vendor_3697_Product_0001.kl文件，我这里只分析IT遥控设备，那我们的Vendor_3697_Product_0001.kl里面又是啥呢，我们可以通过cat命令查看，具体的信息如下：

<span style="font-family:FangSong_GB2312;font-size:18px;"># Copyright (C) 2010 The Android Open Source Project## Licensed under the Apache License, Version 2.0 (the "License");# you may not use this file except in compliance with the License.# You may obtain a copy of the License at##      http://www.apache.org/licenses/LICENSE-2.0## Unless required by applicable law or agreed to in writing, software# distributed under the License is distributed on an "AS IS" BASIS,# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.# See the License for the specific language governing permissions and# limitations under the License.## MStar Smart TV IR Receiver.#key 116     POWER                   WAKEkey 11      0key 2       1key 3       2key 4       3key 5       4key 6       5key 7       6key 8       7key 9       8key 10      9key 398     PROG_REDkey 399     PROG_GREENkey 400     PROG_YELLOWkey 401     PROG_BLUEkey 103     DPAD_UPkey 108     DPAD_DOWNkey 105     DPAD_LEFTkey 106     DPAD_RIGHTkey 28      ENTERkey 402     CHANNEL_UP              WAKE_DROPPEDkey 403     CHANNEL_DOWN            WAKE_DROPPEDkey 115     VOLUME_UP               WAKE_DROPPEDkey 114     VOLUME_DOWN             WAKE_DROPPEDkey 104     PAGE_UPkey 109     PAGE_DOWNkey 102     HOME                    WAKE_DROPPEDkey 139     MENU                    WAKE_DROPPEDkey 158     BACKkey 113     VOLUME_MUTEkey 167     DVRkey 138     GUIDEkey 358     INFO#key 82      WINDOW#key 79      TV_INPUTkey 168     MEDIA_REWINDkey 159     MEDIA_FAST_FORWARDkey 165     MEDIA_PREVIOUSkey 163     MEDIA_NEXTkey 207     MEDIA_PLAYkey 119     MEDIA_PAUSEkey 128     MEDIA_STOP# Common extendedkey 392     SOUND_MODEkey 212     PICTURE_MODEkey 372     ASPECT_RATIOkey 363     CHANNEL_RETURNkey 142     SLEEPkey 365     EPGkey 395     LIST#key 370     SUBTITLEkey 466     MTSkey 467     FREEZEkey 468     TTXkey 469     CCkey 470     TV_SETTINGkey 471     SCREENSHOTkey 356     TV_POWER# Mstar extendedkey 59      MSTAR_BALANCEkey 60      MSTAR_INDEXkey 61      MSTAR_HOLDkey 62      MSTAR_UPDATEkey 63      MSTAR_REVEALkey 64      MSTAR_SUBCODEkey 65      MSTAR_SIZEkey 66      MSTAR_CLOCK</span>

2)在Vendor_3697_Product_0001.kl文件中添加映射 key 123 WLS 说明： key-- 是关键字。固定值，不需要改变。
123-- 该按键在linux驱动中对应的键值，我在这里只是假设的这个值，至于具体对应的是那个可以查看“include/linux/input.h”
WLS-- 123按键映射到Android中的按键，它对应是“KeycodeLabels.h”文件中的KEYCODES表格元素的“literal”值。
其中KeycodeLabels.h的定义如下，我们可以在"MSTAR_PVR_BROWSER", 319后面添加我们需要向Android上层抛的键值，我们这里定义为"WLS", 320,所以当Android上层监听到320的按键值是就是我们新添加的键值了。

<span style="font-family:FangSong_GB2312;font-size:18px;">/** Copyright (C) 2008 The Android Open Source Project** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**   http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/#ifndef _LIBINPUT_KEYCODE_LABELS_H#define _LIBINPUT_KEYCODE_LABELS_H#include <android/keycodes.h>struct KeycodeLabel {  const char *literal;  int value;};static const KeycodeLabel KEYCODES[] = {  { "SOFT_LEFT", 1 },  { "SOFT_RIGHT", 2 },  { "HOME", 3 },  { "BACK", 4 },  { "CALL", 5 },  { "ENDCALL", 6 },  { "0", 7 },  { "1", 8 },  { "2", 9 },  { "3", 10 },  { "4", 11 },  { "5", 12 },  { "6", 13 },  { "7", 14 },  { "8", 15 },  { "9", 16 },  { "STAR", 17 },  { "POUND", 18 },  { "DPAD_UP", 19 },  { "DPAD_DOWN", 20 },  { "DPAD_LEFT", 21 },  { "DPAD_RIGHT", 22 },  { "DPAD_CENTER", 23 },  { "VOLUME_UP", 24 },  { "VOLUME_DOWN", 25 },  { "POWER", 26 },  { "CAMERA", 27 },  { "CLEAR", 28 },  { "A", 29 },  { "B", 30 },  { "C", 31 },  { "D", 32 },  { "E", 33 },  { "F", 34 },  { "G", 35 },  { "H", 36 },  { "I", 37 },  { "J", 38 },  { "K", 39 },  { "L", 40 },  { "M", 41 },  { "N", 42 },  { "O", 43 },  { "P", 44 },  { "Q", 45 },  { "R", 46 },  { "S", 47 },  { "T", 48 },  { "U", 49 },  { "V", 50 },  { "W", 51 },  { "X", 52 },  { "Y", 53 },  { "Z", 54 },  { "COMMA", 55 },  { "PERIOD", 56 },  { "ALT_LEFT", 57 },  { "ALT_RIGHT", 58 },  { "SHIFT_LEFT", 59 },  { "SHIFT_RIGHT", 60 },  { "TAB", 61 },  { "SPACE", 62 },  { "SYM", 63 },  { "EXPLORER", 64 },  { "ENVELOPE", 65 },  { "ENTER", 66 },  { "DEL", 67 },  { "GRAVE", 68 },  { "MINUS", 69 },  { "EQUALS", 70 },  { "LEFT_BRACKET", 71 },  { "RIGHT_BRACKET", 72 },  { "BACKSLASH", 73 },  { "SEMICOLON", 74 },  { "APOSTROPHE", 75 },  { "SLASH", 76 },  { "AT", 77 },  { "NUM", 78 },  { "HEADSETHOOK", 79 },  { "FOCUS", 80 },  { "PLUS", 81 },  { "MENU", 82 },  { "NOTIFICATION", 83 },  { "SEARCH", 84 },  { "MEDIA_PLAY_PAUSE", 85 },  { "MEDIA_STOP", 86 },  { "MEDIA_NEXT", 87 },  { "MEDIA_PREVIOUS", 88 },  { "MEDIA_REWIND", 89 },  { "MEDIA_FAST_FORWARD", 90 },  { "MUTE", 91 },  { "PAGE_UP", 92 },  { "PAGE_DOWN", 93 },  { "PICTSYMBOLS", 94 },  { "SWITCH_CHARSET", 95 },  { "BUTTON_A", 96 },  { "BUTTON_B", 97 },  { "BUTTON_C", 98 },  { "BUTTON_X", 99 },  { "BUTTON_Y", 100 },  { "BUTTON_Z", 101 },  { "BUTTON_L1", 102 },  { "BUTTON_R1", 103 },  { "BUTTON_L2", 104 },  { "BUTTON_R2", 105 },  { "BUTTON_THUMBL", 106 },  { "BUTTON_THUMBR", 107 },  { "BUTTON_START", 108 },  { "BUTTON_SELECT", 109 },  { "BUTTON_MODE", 110 },  { "ESCAPE", 111 },  { "FORWARD_DEL", 112 },  { "CTRL_LEFT", 113 },  { "CTRL_RIGHT", 114 },  { "CAPS_LOCK", 115 },  { "SCROLL_LOCK", 116 },  { "META_LEFT", 117 },  { "META_RIGHT", 118 },  { "FUNCTION", 119 },  { "SYSRQ", 120 },  { "BREAK", 121 },  { "MOVE_HOME", 122 },  { "MOVE_END", 123 },  { "INSERT", 124 },  { "FORWARD", 125 },  { "MEDIA_PLAY", 126 },  { "MEDIA_PAUSE", 127 },  { "MEDIA_CLOSE", 128 },  { "MEDIA_EJECT", 129 },  { "MEDIA_RECORD", 130 },  { "F1", 131 },  { "F2", 132 },  { "F3", 133 },  { "F4", 134 },  { "F5", 135 },  { "F6", 136 },  { "F7", 137 },  { "F8", 138 },  { "F9", 139 },  { "F10", 140 },  { "F11", 141 },  { "F12", 142 },  { "NUM_LOCK", 143 },  { "NUMPAD_0", 144 },  { "NUMPAD_1", 145 },  { "NUMPAD_2", 146 },  { "NUMPAD_3", 147 },  { "NUMPAD_4", 148 },  { "NUMPAD_5", 149 },  { "NUMPAD_6", 150 },  { "NUMPAD_7", 151 },  { "NUMPAD_8", 152 },  { "NUMPAD_9", 153 },  { "NUMPAD_DIVIDE", 154 },  { "NUMPAD_MULTIPLY", 155 },  { "NUMPAD_SUBTRACT", 156 },  { "NUMPAD_ADD", 157 },  { "NUMPAD_DOT", 158 },  { "NUMPAD_COMMA", 159 },  { "NUMPAD_ENTER", 160 },  { "NUMPAD_EQUALS", 161 },  { "NUMPAD_LEFT_PAREN", 162 },  { "NUMPAD_RIGHT_PAREN", 163 },  { "VOLUME_MUTE", 164 },  { "INFO", 165 },  { "CHANNEL_UP", 166 },  { "CHANNEL_DOWN", 167 },  { "ZOOM_IN", 168 },  { "ZOOM_OUT", 169 },  { "TV", 170 },  { "WINDOW", 171 },  { "GUIDE", 172 },  { "DVR", 173 },  { "BOOKMARK", 174 },  { "CAPTIONS", 175 },  { "SETTINGS", 176 },  { "TV_POWER", 177 },  { "TV_INPUT", 178 },  { "STB_POWER", 179 },  { "STB_INPUT", 180 },  { "AVR_POWER", 181 },  { "AVR_INPUT", 182 },  { "PROG_RED", 183 },  { "PROG_GREEN", 184 },  { "PROG_YELLOW", 185 },  { "PROG_BLUE", 186 },  { "APP_SWITCH", 187 },  { "BUTTON_1", 188 },  { "BUTTON_2", 189 },  { "BUTTON_3", 190 },  { "BUTTON_4", 191 },  { "BUTTON_5", 192 },  { "BUTTON_6", 193 },  { "BUTTON_7", 194 },  { "BUTTON_8", 195 },  { "BUTTON_9", 196 },  { "BUTTON_10", 197 },  { "BUTTON_11", 198 },  { "BUTTON_12", 199 },  { "BUTTON_13", 200 },  { "BUTTON_14", 201 },  { "BUTTON_15", 202 },  { "BUTTON_16", 203 },  { "LANGUAGE_SWITCH", 204 },  { "MANNER_MODE", 205 },  { "3D_MODE", 206 },  { "CONTACTS", 207 },  { "CALENDAR", 208 },  { "MUSIC", 209 },  { "CALCULATOR", 210 },  { "ZENKAKU_HANKAKU", 211 },  { "EISU", 212 },  { "MUHENKAN", 213 },  { "HENKAN", 214 },  { "KATAKANA_HIRAGANA", 215 },  { "YEN", 216 },  { "RO", 217 },  { "KANA", 218 },  { "ASSIST", 219 },  { "BRIGHTNESS_DOWN", 220 },  { "BRIGHTNESS_UP", 221 },  { "MEDIA_AUDIO_TRACK", 222 },  // MStar Android Patch Begin  // Common section, range 251-300  { "SOUND_MODE", 251 },  { "PICTURE_MODE", 252 },  { "ASPECT_RATIO", 253 },  { "CHANNEL_RETURN", 254 },  { "SLEEP", 255 },  { "EPG", 256 },  { "LIST", 257 },  { "SUBTITLE", 258 },  { "FAVORITE", 259 },  { "MTS", 260 },  { "FREEZE", 261 },  { "TTX", 262 },  { "CC", 263 },  { "TV_SETTING", 264 },  { "SCREENSHOT", 265 },  { "CLOUD", 266 },  { "VOICE", 267 },  { "USB", 268 },  { "HDMI", 269 },  { "DISPLAY_MODE", 270 },  { "SONG_SYSTEM", 271 },  { "GINGA_BACK", 272},  { "NETFLIX", 273},  { "AMAZONE", 274},  // MStar section, range 301-400  { "MSTAR_BALANCE", 301 },  { "MSTAR_INDEX", 302 },  { "MSTAR_HOLD", 303 },  { "MSTAR_UPDATE", 304 },  { "MSTAR_REVEAL", 305 },  { "MSTAR_SUBCODE", 306 },  { "MSTAR_SIZE", 307 },  { "MSTAR_CLOCK", 308 },  { "MSTAR_STORE_UP", 309 },  { "MSTAR_TRIANGLE_UP", 310 },  { "MSTAR_MOVIE", 311 },  { "MSTAR_FILE", 312 },  { "MSTAR_STAR_PLUS", 313 },  { "MSTAR_AUDIO_TRACK", 314 },  { "MSTAR_OPTIONAL_TIME", 315 },  { "MSTAR_LOOP", 316 },  { "MSTAR_INBOX", 317 },  { "MSTAR_VVOIP", 318 },  { "MSTAR_PVR_BROWSER", 319 },  // Haier section, range 401-500  { "HAIER_TASK", 401 },  { "HAIER_USB", 402 },  { "HAIER_TOOLS", 403 },  { "HAIER_POWERSLEEP", 404 },  { "HAIER_WAKEUP", 405 },  { "HAIER_UNMUTE", 406 },  { "HAIER_CLEANSEARCH", 407 },  // Konka section, range 501-600  { "KONKA_YPBPR", 501 },  { "KONKA_THREEPOINT_LOONPRESS", 502 },  { "KONKA_THREEPOINT_COLLECT", 503 },  { "KONKA_THREEPOINT_DISPERSE", 504 },  { "KONKA_VOICESWITCH", 505 },  { "KONKA_FLYIMEFINGER_SELECT", 506 },  { "KONKA_FLYIMEFINGER_CANCEL", 507 },  { "KONKA_SOUNDOUTPUT_ENABLE", 508 },  { "KONKA_SOUNDOUTPUT_DISABLE", 509 },  { "KONKA_BESTV_EXIT", 510 },  { "KONKA_BESTV_FORWARD", 511 },  { "KONKA_BESTV_BACKWARD", 512 },  { "KONKA_ENTER_FACTORY", 513 },  { "KONKA_FACTORY_BAKE_TV", 514 },  // Skyworth section, range 601-700  // Tcl section, range 4001-4099  { "TCL_MITV", 4001 },  { "TCL_USB_MENU", 4002 },  { "TCL_SWING_R1", 4003 },  { "TCL_SWING_R2", 4004 },  { "TCL_SWING_R3", 4005 },  { "TCL_SWING_R4", 4006 },  { "TCL_SWING_L1", 4007 },  { "TCL_SWING_L2", 4008 },  { "TCL_SWING_L3", 4009 },  { "TCL_SWING_L4", 4010},  { "TCL_WIDGET", 4011},  { "TCL_VGR_LEFT", 4012},  { "TCL_VGR_RIGHT", 4013 },  { "TCL_VGR_TAP", 4014 },  { "TCL_VGR_WAVE", 4015 },  { "TCL_VGR_WAVE_LEFT", 4016 },  { "TCL_VGR_WAVE_RIGHT", 4017 },  { "TCL_VGR_ACTIVE", 4018 },  { "TCL_VGR_DEACTIVE", 4019 },  { "TCL_BODY_SENSOR", 4020 },  { "TCL_CIRCLE_CLOCKWISE", 4021 },  { "TCL_CIRCLE_CTR_CLOCKWISE", 4022 },  { "TCL_GESTURE_X", 4023 },  { "TCL_GESTURE_ALPHA", 4024 },  { "TCL_GESTURE_MUTE", 4025 },  { "TCL_UP", 4026 },  { "TCL_DOWN", 4027 },  { "TCL_LEFT", 4028 },  { "TCL_RIGHT", 4029 },  { "TCL_UP_LEFT", 4030 },  { "TCL_UP_RIGHT", 4031 },  { "TCL_DOWN_LEFT", 4032 },  { "TCL_DOWN_RIGHT", 4033 },  // Changhong section, range 4101-4199  { "CHANGHONGIR_MUTE", 4101 },  { "CHANGHONGIR_INPUT", 4102 },  { "CHANGHONGIR_DEL", 4103 },  { "CHANGHONGIR_MENU", 4104 },  { "CHANGHONGIR_CORN", 4105 },  { "CHANGHONGIR_OK", 4106 },  { "CHANGHONGIR_FLCK_FU", 4107 },  { "CHANGHONGIR_FLCK_FD", 4108 },  { "CHANGHONGIR_FLCK_FL", 4109 },  { "CHANGHONGIR_FLCK_FR", 4110 },  { "CHANGHONGIR_FLCK_SU", 4111 },  { "CHANGHONGIR_FLCK_SD", 4112 },  { "CHANGHONGIR_FLCK_SL", 4113 },  { "CHANGHONGIR_FLCK_SR", 4114 },  { "CHANGHONGIR_PINCH", 4115 },  { "CHANGHONGIR_SPREAD", 4116 },  { "CHANGHONGIR_VOICE", 4117 },  { "CHANGHONGIR_HAND", 4118 },  { "CHANGHONGIR_3D", 4119 },  { "CHANGHONGIR_HELP", 4120 },  { "CHANGHONGIR_APP", 4121 },  { "CHANGHONGIR_MOUSE", 4122 },  { "CHANGHONGIR_EPG", 4123 },  { "CHANGHONGIR_HOME", 4124 },  { "CHANGHONGIR_SETTINGS", 4125 },  // Hisense section, range 4201-4299  { "HISENSE_G_SENSOR", 4201 },  { "HISENSE_LOW_BATTERY", 4202 },  { "HISENSE_SLIDEUP", 4203 },  { "HISENSE_SLIDEDOWN", 4204 },  { "HISENSE_SLIDELEFT", 4205 },  { "HISENSE_SLIDERIGHT", 4206 },  { "HISENSE_RAPID_SLIDEUP", 4207 },  { "HISENSE_RAPID_SLIDEDOWN", 4208 },  { "HISENSE_RAPID_SLIDELEFT", 4209 },  { "HISENSE_RAPID_SLIDERIGHT", 4210 },  { "HISENSE_FAC_NEC_M", 4211 },  { "HISENSE_FAC_NEC_IP", 4212 },  { "HISENSE_FAC_NEC_SAVE", 4213 },  { "HISENSE_FAC_NEC_3D", 4214 },  { "HISENSE_FAC_NEC_PC", 4215 },  { "HISENSE_FAC_NEC_LOGO", 4216 },  { "HISENSE_FAC_NEC_YPBPR", 4217 },  { "HISENSE_FAC_NEC_HDMI", 4218 },  { "HISENSE_FAC_NEC_F1", 4219 },  { "HISENSE_FAC_NEC_F2", 4220 },  { "HISENSE_FAC_NEC_F3", 4221 },  { "HISENSE_FAC_NEC_F4", 4222 },  { "HISENSE_FAC_NEC_F5", 4223 },  { "HISENSE_FAC_NEC_F6", 4224 },  { "HISENSE_FAC_NEC_F7", 4225 },  { "HISENSE_FAC_NEC_OK", 4226 },  { "HISENSE_FAC_NEC_MAC", 4227 },  { "HISENSE_FAC_NEC_AV", 4228 },  { "HISENSE_FAC_NEC_PATTERN", 4229 },  { "HISENSE_FAC_NEC_AGING", 4230 },  { "HISENSE_FAC_NEC_BALANCE", 4231 },  { "HISENSE_FAC_NEC_ADC", 4232 },  { "HISENSE_FAC_NEC_RDRV_INCREASE", 4233 },  { "HISENSE_FAC_NEC_RDRV_DECREASE", 4234 },  { "HISENSE_FAC_NEC_GDRV_INCREASE", 4235 },  { "HISENSE_FAC_NEC_GDRV_DECREASE", 4236 },  { "HISENSE_FAC_NEC_BDRV_INCREASE", 4237 },  { "HISENSE_FAC_NEC_BDRV_DECREASE", 4238 },  { "HISENSE_FAC_NEC_RCUT_INCREASE", 4239 },  { "HISENSE_FAC_NEC_RCUT_DECREASE", 4240 },  { "HISENSE_FAC_NEC_GCUT_INCREASE", 4241 },  { "HISENSE_FAC_NEC_GCUT_DECREASE", 4242 },  { "HISENSE_FAC_NEC_BCUT_INCREASE", 4243 },  { "HISENSE_FAC_NEC_BCUT_DECREASE", 4244 },  { "HISENSE_PRODUCT_SCAN_START", 4245 },  { "HISENSE_PRODUCT_SCAN_OVER", 4246 },  { "HISENSE_TEST_BROAD_TV", 4247 },  { "HISENSE_TEST_BROAD_DTV", 4248 },  { "HISENSE_TEST_BROAD_AV1", 4249 },  { "HISENSE_TEST_BROAD_AV2", 4250 },  { "HISENSE_TEST_BROAD_AV3", 4251 },  { "HISENSE_TEST_BROAD_SVIDEO1", 4252 },  { "HISENSE_TEST_BROAD_SVIDEO2", 4253 },  { "HISENSE_TEST_BROAD_SVIDEO3", 4254 },  { "HISENSE_TEST_BROAD_SCART1", 4255 },  { "HISENSE_TEST_BROAD_SCART2", 4256 },  { "HISENSE_TEST_BROAD_SCART3", 4257 },  { "HISENSE_TEST_BOARD_YPBPR1", 4258 },  { "HISENSE_TEST_BOARD_YPBPR2", 4259 },  { "HISENSE_TEST_BOARD_YPBPR3", 4260 },  { "HISENSE_TEST_BOARD_VGA", 4261 },  { "HISENSE_TEST_BOARD_HDMI1", 4262 },  { "HISENSE_TEST_BOARD_HDMI2", 4263 },  { "HISENSE_TEST_BOARD_HDMI3", 4264 },  { "HISENSE_TEST_BOARD_HDMI4", 4265 },  { "HISENSE_TEST_BOARD_HDMI5", 4266 },  { "HISENSE_TEST_BOARD_DMP", 4267 },  { "HISENSE_TEST_BOARD_EMP", 4268 },  { "HISENSE_TEST_BOARD_AUTOCOLOR", 4269 },  { "HISENSE_TEST_BOARD_SAVE", 4270 },  { "HISENSE_TEST_BOARD_TELITEXT", 4271 },  { "HISENSE_TEST_BOARD_SAPL", 4272 },  { "HISENSE_TEST_BOARD_VCHIP", 4273 },  { "HISENSE_TEST_BOARD_CCD", 4274 },  { "HISENSE_TEST_BOARD_BTSC", 4275 },  { "HISENSE_TEST_BOARD_FAC_OK", 4276 },  // MStar Android Patch End  // NOTE: If you add a new keycode here you must also add it to several other files.  //    Refer to frameworks/base/core/java/android/view/KeyEvent.java for the full list.  { NULL, 0 }};// NOTE: If you edit these flags, also edit policy flags in Input.h.static const KeycodeLabel FLAGS[] = {  { "WAKE", 0x00000001 },  { "WAKE_DROPPED", 0x00000002 },  { "SHIFT", 0x00000004 },  { "CAPS_LOCK", 0x00000008 },  { "ALT", 0x00000010 },  { "ALT_GR", 0x00000020 },  { "MENU", 0x00000040 },  { "LAUNCHER", 0x00000080 },  { "VIRTUAL", 0x00000100 },  { "FUNCTION", 0x00000200 },  { NULL, 0 }};static const KeycodeLabel AXES[] = {  { "X", 0 },  { "Y", 1 },  { "PRESSURE", 2 },  { "SIZE", 3 },  { "TOUCH_MAJOR", 4 },  { "TOUCH_MINOR", 5 },  { "TOOL_MAJOR", 6 },  { "TOOL_MINOR", 7 },  { "ORIENTATION", 8 },  { "VSCROLL", 9 },  { "HSCROLL", 10 },  { "Z", 11 },  { "RX", 12 },  { "RY", 13 },  { "RZ", 14 },  { "HAT_X", 15 },  { "HAT_Y", 16 },  { "LTRIGGER", 17 },  { "RTRIGGER", 18 },  { "THROTTLE", 19 },  { "RUDDER", 20 },  { "WHEEL", 21 },  { "GAS", 22 },  { "BRAKE", 23 },  { "DISTANCE", 24 },  { "TILT", 25 },  { "GENERIC_1", 32 },  { "GENERIC_2", 33 },  { "GENERIC_3", 34 },  { "GENERIC_4", 35 },  { "GENERIC_5", 36 },  { "GENERIC_6", 37 },  { "GENERIC_7", 38 },  { "GENERIC_8", 39 },  { "GENERIC_9", 40 },  { "GENERIC_10", 41 },  { "GENERIC_11", 42 },  { "GENERIC_12", 43 },  { "GENERIC_13", 44 },  { "GENERIC_14", 45 },  { "GENERIC_15", 46 },  { "GENERIC_16", 47 },  // NOTE: If you add a new axis here you must also add it to several other files.  //    Refer to frameworks/base/core/java/android/view/MotionEvent.java for the full list.  { NULL, -1 }};#endif // _LIBINPUT_KEYCODE_LABELS_H</span>

3)在/frameworks/native/include/android/keycodes.h中添加如下的 AKEYCODE_MSTAR_WLS = 320，下面看下该文件的定义

<span style="font-family:FangSong_GB2312;font-size:18px;">/* * Copyright (C) 2010 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */#ifndef _ANDROID_KEYCODES_H#define _ANDROID_KEYCODES_H/****************************************************************** * * IMPORTANT NOTICE: * *   This file is part of Android's set of stable system headers *   exposed by the Android NDK (Native Development Kit). * *   Third-party source AND binary code relies on the definitions *   here to be FROZEN ON ALL UPCOMING PLATFORM RELEASES. * *   - DO NOT MODIFY ENUMS (EXCEPT IF YOU ADD NEW 32-BIT VALUES) *   - DO NOT MODIFY CONSTANTS OR FUNCTIONAL MACROS *   - DO NOT CHANGE THE SIGNATURE OF FUNCTIONS IN ANY WAY *   - DO NOT CHANGE THE LAYOUT OR SIZE OF STRUCTURES */#include <sys/types.h>#ifdef __cplusplusextern "C" {#endif/* * Key codes. */enum {    AKEYCODE_UNKNOWN         = 0,    AKEYCODE_SOFT_LEFT       = 1,    AKEYCODE_SOFT_RIGHT      = 2,    AKEYCODE_HOME            = 3,    AKEYCODE_BACK            = 4,    AKEYCODE_CALL            = 5,    AKEYCODE_ENDCALL         = 6,    AKEYCODE_0               = 7,    AKEYCODE_1               = 8,    AKEYCODE_2               = 9,    AKEYCODE_3               = 10,    AKEYCODE_4               = 11,    AKEYCODE_5               = 12,    AKEYCODE_6               = 13,    AKEYCODE_7               = 14,    AKEYCODE_8               = 15,    AKEYCODE_9               = 16,    AKEYCODE_STAR            = 17,    AKEYCODE_POUND           = 18,    AKEYCODE_DPAD_UP         = 19,    AKEYCODE_DPAD_DOWN       = 20,    AKEYCODE_DPAD_LEFT       = 21,    AKEYCODE_DPAD_RIGHT      = 22,    AKEYCODE_DPAD_CENTER     = 23,    AKEYCODE_VOLUME_UP       = 24,    AKEYCODE_VOLUME_DOWN     = 25,    AKEYCODE_POWER           = 26,    AKEYCODE_CAMERA          = 27,    AKEYCODE_CLEAR           = 28,    AKEYCODE_A               = 29,    AKEYCODE_B               = 30,    AKEYCODE_C               = 31,    AKEYCODE_D               = 32,    AKEYCODE_E               = 33,    AKEYCODE_F               = 34,    AKEYCODE_G               = 35,    AKEYCODE_H               = 36,    AKEYCODE_I               = 37,    AKEYCODE_J               = 38,    AKEYCODE_K               = 39,    AKEYCODE_L               = 40,    AKEYCODE_M               = 41,    AKEYCODE_N               = 42,    AKEYCODE_O               = 43,    AKEYCODE_P               = 44,    AKEYCODE_Q               = 45,    AKEYCODE_R               = 46,    AKEYCODE_S               = 47,    AKEYCODE_T               = 48,    AKEYCODE_U               = 49,    AKEYCODE_V               = 50,    AKEYCODE_W               = 51,    AKEYCODE_X               = 52,    AKEYCODE_Y               = 53,    AKEYCODE_Z               = 54,    AKEYCODE_COMMA           = 55,    AKEYCODE_PERIOD          = 56,    AKEYCODE_ALT_LEFT        = 57,    AKEYCODE_ALT_RIGHT       = 58,    AKEYCODE_SHIFT_LEFT      = 59,    AKEYCODE_SHIFT_RIGHT     = 60,    AKEYCODE_TAB             = 61,    AKEYCODE_SPACE           = 62,    AKEYCODE_SYM             = 63,    AKEYCODE_EXPLORER        = 64,    AKEYCODE_ENVELOPE        = 65,    AKEYCODE_ENTER           = 66,    AKEYCODE_DEL             = 67,    AKEYCODE_GRAVE           = 68,    AKEYCODE_MINUS           = 69,    AKEYCODE_EQUALS          = 70,    AKEYCODE_LEFT_BRACKET    = 71,    AKEYCODE_RIGHT_BRACKET   = 72,    AKEYCODE_BACKSLASH       = 73,    AKEYCODE_SEMICOLON       = 74,    AKEYCODE_APOSTROPHE      = 75,    AKEYCODE_SLASH           = 76,    AKEYCODE_AT              = 77,    AKEYCODE_NUM             = 78,    AKEYCODE_HEADSETHOOK     = 79,    AKEYCODE_FOCUS           = 80,   // *Camera* focus    AKEYCODE_PLUS            = 81,    AKEYCODE_MENU            = 82,    AKEYCODE_NOTIFICATION    = 83,    AKEYCODE_SEARCH          = 84,    AKEYCODE_MEDIA_PLAY_PAUSE= 85,    AKEYCODE_MEDIA_STOP      = 86,    AKEYCODE_MEDIA_NEXT      = 87,    AKEYCODE_MEDIA_PREVIOUS  = 88,    AKEYCODE_MEDIA_REWIND    = 89,    AKEYCODE_MEDIA_FAST_FORWARD = 90,    AKEYCODE_MUTE            = 91,    AKEYCODE_PAGE_UP         = 92,    AKEYCODE_PAGE_DOWN       = 93,    AKEYCODE_PICTSYMBOLS     = 94,    AKEYCODE_SWITCH_CHARSET  = 95,    AKEYCODE_BUTTON_A        = 96,    AKEYCODE_BUTTON_B        = 97,    AKEYCODE_BUTTON_C        = 98,    AKEYCODE_BUTTON_X        = 99,    AKEYCODE_BUTTON_Y        = 100,    AKEYCODE_BUTTON_Z        = 101,    AKEYCODE_BUTTON_L1       = 102,    AKEYCODE_BUTTON_R1       = 103,    AKEYCODE_BUTTON_L2       = 104,    AKEYCODE_BUTTON_R2       = 105,    AKEYCODE_BUTTON_THUMBL   = 106,    AKEYCODE_BUTTON_THUMBR   = 107,    AKEYCODE_BUTTON_START    = 108,    AKEYCODE_BUTTON_SELECT   = 109,    AKEYCODE_BUTTON_MODE     = 110,    AKEYCODE_ESCAPE          = 111,    AKEYCODE_FORWARD_DEL     = 112,    AKEYCODE_CTRL_LEFT       = 113,    AKEYCODE_CTRL_RIGHT      = 114,    AKEYCODE_CAPS_LOCK       = 115,    AKEYCODE_SCROLL_LOCK     = 116,    AKEYCODE_META_LEFT       = 117,    AKEYCODE_META_RIGHT      = 118,    AKEYCODE_FUNCTION        = 119,    AKEYCODE_SYSRQ           = 120,    AKEYCODE_BREAK           = 121,    AKEYCODE_MOVE_HOME       = 122,    AKEYCODE_MOVE_END        = 123,    AKEYCODE_INSERT          = 124,    AKEYCODE_FORWARD         = 125,    AKEYCODE_MEDIA_PLAY      = 126,    AKEYCODE_MEDIA_PAUSE     = 127,    AKEYCODE_MEDIA_CLOSE     = 128,    AKEYCODE_MEDIA_EJECT     = 129,    AKEYCODE_MEDIA_RECORD    = 130,    AKEYCODE_F1              = 131,    AKEYCODE_F2              = 132,    AKEYCODE_F3              = 133,    AKEYCODE_F4              = 134,    AKEYCODE_F5              = 135,    AKEYCODE_F6              = 136,    AKEYCODE_F7              = 137,    AKEYCODE_F8              = 138,    AKEYCODE_F9              = 139,    AKEYCODE_F10             = 140,    AKEYCODE_F11             = 141,    AKEYCODE_F12             = 142,    AKEYCODE_NUM_LOCK        = 143,    AKEYCODE_NUMPAD_0        = 144,    AKEYCODE_NUMPAD_1        = 145,    AKEYCODE_NUMPAD_2        = 146,    AKEYCODE_NUMPAD_3        = 147,    AKEYCODE_NUMPAD_4        = 148,    AKEYCODE_NUMPAD_5        = 149,    AKEYCODE_NUMPAD_6        = 150,    AKEYCODE_NUMPAD_7        = 151,    AKEYCODE_NUMPAD_8        = 152,    AKEYCODE_NUMPAD_9        = 153,    AKEYCODE_NUMPAD_DIVIDE   = 154,    AKEYCODE_NUMPAD_MULTIPLY = 155,    AKEYCODE_NUMPAD_SUBTRACT = 156,    AKEYCODE_NUMPAD_ADD      = 157,    AKEYCODE_NUMPAD_DOT      = 158,    AKEYCODE_NUMPAD_COMMA    = 159,    AKEYCODE_NUMPAD_ENTER    = 160,    AKEYCODE_NUMPAD_EQUALS   = 161,    AKEYCODE_NUMPAD_LEFT_PAREN = 162,    AKEYCODE_NUMPAD_RIGHT_PAREN = 163,    AKEYCODE_VOLUME_MUTE     = 164,    AKEYCODE_INFO            = 165,    AKEYCODE_CHANNEL_UP      = 166,    AKEYCODE_CHANNEL_DOWN    = 167,    AKEYCODE_ZOOM_IN         = 168,    AKEYCODE_ZOOM_OUT        = 169,    AKEYCODE_TV              = 170,    AKEYCODE_WINDOW          = 171,    AKEYCODE_GUIDE           = 172,    AKEYCODE_DVR             = 173,    AKEYCODE_BOOKMARK        = 174,    AKEYCODE_CAPTIONS        = 175,    AKEYCODE_SETTINGS        = 176,    AKEYCODE_TV_POWER        = 177,    AKEYCODE_TV_INPUT        = 178,    AKEYCODE_STB_POWER       = 179,    AKEYCODE_STB_INPUT       = 180,    AKEYCODE_AVR_POWER       = 181,    AKEYCODE_AVR_INPUT       = 182,    AKEYCODE_PROG_RED        = 183,    AKEYCODE_PROG_GREEN      = 184,    AKEYCODE_PROG_YELLOW     = 185,    AKEYCODE_PROG_BLUE       = 186,    AKEYCODE_APP_SWITCH      = 187,    AKEYCODE_BUTTON_1        = 188,    AKEYCODE_BUTTON_2        = 189,    AKEYCODE_BUTTON_3        = 190,    AKEYCODE_BUTTON_4        = 191,    AKEYCODE_BUTTON_5        = 192,    AKEYCODE_BUTTON_6        = 193,    AKEYCODE_BUTTON_7        = 194,    AKEYCODE_BUTTON_8        = 195,    AKEYCODE_BUTTON_9        = 196,    AKEYCODE_BUTTON_10       = 197,    AKEYCODE_BUTTON_11       = 198,    AKEYCODE_BUTTON_12       = 199,    AKEYCODE_BUTTON_13       = 200,    AKEYCODE_BUTTON_14       = 201,    AKEYCODE_BUTTON_15       = 202,    AKEYCODE_BUTTON_16       = 203,    AKEYCODE_LANGUAGE_SWITCH = 204,    AKEYCODE_MANNER_MODE     = 205,    AKEYCODE_3D_MODE         = 206,    AKEYCODE_CONTACTS        = 207,    AKEYCODE_CALENDAR        = 208,    AKEYCODE_MUSIC           = 209,    AKEYCODE_CALCULATOR      = 210,    AKEYCODE_ZENKAKU_HANKAKU = 211,    AKEYCODE_EISU            = 212,    AKEYCODE_MUHENKAN        = 213,    AKEYCODE_HENKAN          = 214,    AKEYCODE_KATAKANA_HIRAGANA = 215,    AKEYCODE_YEN             = 216,    AKEYCODE_RO              = 217,    AKEYCODE_KANA            = 218,    AKEYCODE_ASSIST          = 219,    AKEYCODE_BRIGHTNESS_DOWN = 220,    AKEYCODE_BRIGHTNESS_UP   = 221,    AKEYCODE_MEDIA_AUDIO_TRACK = 222,    // MStar Android Patch Begin    // Common section, range 251-300    AKEYCODE_SOUND_MODE                 = 251,    AKEYCODE_PICTURE_MODE               = 252,    AKEYCODE_ASPECT_RATIO               = 253,    AKEYCODE_CHANNEL_RETURN             = 254,    AKEYCODE_SLEEP                      = 255,    AKEYCODE_EPG                        = 256,    AKEYCODE_LIST                       = 257,    AKEYCODE_SUBTITLE                   = 258,    AKEYCODE_FAVORITE                   = 259,    AKEYCODE_MTS                        = 260,    AKEYCODE_FREEZE                     = 261,    AKEYCODE_TTX                        = 262,    AKEYCODE_CC                         = 263,    AKEYCODE_TV_SETTING                 = 264,    AKEYCODE_SCREENSHOT                 = 265,    AKEYCODE_CLOUD                      = 266,    AKEYCODE_VOICE                      = 267,    AKEYCODE_USB                        = 268,    AKEYCODE_HDMI                       = 269,    AKEYCODE_DISPLAY_MODE               = 270,    AKEYCODE_SONG_SYSTEM                = 271,    AKEYCODE_GINGA_BACK                 = 272,    AKEYCODE_NETFLIX                    = 273,    AKEYCODE_AMAZONE                    = 274,    // Mstar section, range 301-400    AKEYCODE_MSTAR_BALANCE              = 301,    AKEYCODE_MSTAR_INDEX                = 302,    AKEYCODE_MSTAR_HOLD                 = 303,    AKEYCODE_MSTAR_UPDATE               = 304,    AKEYCODE_MSTAR_REVEAL               = 305,    AKEYCODE_MSTAR_SUBCODE              = 306,    AKEYCODE_MSTAR_SIZE                 = 307,    AKEYCODE_MSTAR_CLOCK                = 308,    AKEYCODE_MSTAR_STORE_UP             = 309,    AKEYCODE_MSTAR_TRIANGLE_UP          = 310,    AKEYCODE_MSTAR_MOVIE                = 311,    AKEYCODE_MSTAR_FILE                 = 312,    AKEYCODE_MSTAR_STAR_PLUS            = 313,    AKEYCODE_MSTAR_AUDIO_TRACK          = 314,    AKEYCODE_MSTAR_OPTIONAL_TIME        = 315,    AKEYCODE_MSTAR_LOOP                 = 316,    AKEYCODE_MSTAR_INBOX                = 317,    AKEYCODE_MSTAR_VVOIP                = 318,    AKEYCODE_MSTAR_PVR_BROWSER          = 319,    // Konka section, range 501-600    AKEYCODE_KONKA_YPBPR                = 501,    AKEYCODE_KONKA_THREEPOINT_LOONPRESS = 502,    AKEYCODE_KONKA_THREEPOINT_COLLECT   = 503,    AKEYCODE_KONKA_THREEPOINT_DISPERSE  = 504,    AKEYCODE_KONKA_VOICESWITCH          = 505,    AKEYCODE_KONKA_FLYIMEFINGER_SELECT  = 506,    AKEYCODE_KONKA_FLYIMEFINGER_CANCEL  = 507,    AKEYCODE_KONKA_SOUNDOUTPUT_ENABLE   = 508,    AKEYCODE_KONKA_SOUNDOUTPUT_DISABLE  = 509,    AKEYCODE_KONKA_BESTV_EXIT           = 510,    AKEYCODE_KONKA_BESTV_FORWARD        = 511,    AKEYCODE_KONKA_BESTV_BACKWARD       = 512,    AKEYCODE_KONKA_ENTER_FACTORY        = 513,    AKEYCODE_KONKA_FACTORY_BAKE_TV      = 514,    // Haier section, range  401-500    AKEYCODE_HAIER_TASK                 = 401,    AKEYCODE_HAIER_TOOLS                = 402,    AKEYCODE_HAIER_POWERSLEEP           = 403,    AKEYCODE_HAIER_WAKEUP               = 404,    AKEYCODE_HAIER_UNMUTE               = 405,    AKEYCODE_HAIER_CLEANSEARCH          = 406,    // Skyworth section, range 601-700    // Tcl section, range 4001-4100    AKEYCODE_TCL_MITV                   = 4001,    AKEYCODE_TCL_USB_MENU               = 4002,    AKEYCODE_TCL_SWING_R1               = 4003,    AKEYCODE_TCL_SWING_R2               = 4004,    AKEYCODE_TCL_SWING_R3               = 4005,    AKEYCODE_TCL_SWING_R4               = 4006,    AKEYCODE_TCL_SWING_L1               = 4007,    AKEYCODE_TCL_SWING_L2               = 4008,    AKEYCODE_TCL_SWING_L3               = 4009,    AKEYCODE_TCL_SWING_L4               = 4010,    AKEYCODE_TCL_WIDGET                 = 4011,    AKEYCODE_TCL_VGR_LEFT               = 4012,    AKEYCODE_TCL_VGR_RIGHT              = 4013,    AKEYCODE_TCL_VGR_TAP                = 4014,    AKEYCODE_TCL_VGR_WAVE               = 4015,    AKEYCODE_TCL_VGR_WAVE_LEFT          = 4016,    AKEYCODE_TCL_VGR_WAVE_RIGHT         = 4017,    AKEYCODE_TCL_VGR_ACTIVE             = 4018,    AKEYCODE_TCL_VGR_DEACTIVE           = 4019,    AKEYCODE_TCL_BODY_SENSOR            = 4020,    AKEYCODE_TCL_CIRCLE_CLOCKWISE       = 4021,    AKEYCODE_TCL_CIRCLE_CTR_CLOCKWISE   = 4022,    AKEYCODE_TCL_GESTURE_X              = 4023,    AKEYCODE_TCL_GESTURE_ALPHA          = 4024,    AKEYCODE_TCL_GESTURE_MUTE           = 4025,    AKEYCODE_TCL_UP                     = 4026,    AKEYCODE_TCL_DOWN                   = 4027,    AKEYCODE_TCL_LEFT                   = 4028,    AKEYCODE_TCL_RIGHT                  = 4029,    AKEYCODE_TCL_UP_LEFT                = 4030,    AKEYCODE_TCL_UP_RIGHT               = 4031,    AKEYCODE_TCL_DOWN_LEFT              = 4032,    AKEYCODE_TCL_DOWN_RIGHT             = 4033,    // Changhong section, range 4101-4200    AKEYCODE_CHANGHONGIR_MUTE           = 4101,    AKEYCODE_CHANGHONGIR_INPUT          = 4102,    AKEYCODE_CHANGHONGIR_DEL            = 4103,    AKEYCODE_CHANGHONGIR_MENU           = 4104,    AKEYCODE_CHANGHONGIR_CORN           = 4105,    AKEYCODE_CHANGHONGIR_OK             = 4106,    AKEYCODE_CHANGHONGIR_FLCK_FU        = 4107,    AKEYCODE_CHANGHONGIR_FLCK_FD        = 4108,    AKEYCODE_CHANGHONGIR_FLCK_FL        = 4109,    AKEYCODE_CHANGHONGIR_FLCK_FR        = 4110,    AKEYCODE_CHANGHONGIR_FLCK_SU        = 4111,    AKEYCODE_CHANGHONGIR_FLCK_SD        = 4112,    AKEYCODE_CHANGHONGIR_FLCK_SL        = 4113,    AKEYCODE_CHANGHONGIR_FLCK_SR        = 4114,    AKEYCODE_CHANGHONGIR_PINCH          = 4115,    AKEYCODE_CHANGHONGIR_SPREAD         = 4116,    AKEYCODE_CHANGHONGIR_VOICE          = 4117,    AKEYCODE_CHANGHONGIR_HAND           = 4118,    AKEYCODE_CHANGHONGIR_3D             = 4119,    AKEYCODE_CHANGHONGIR_HELP           = 4120,    AKEYCODE_CHANGHONGIR_APP            = 4121,    AKEYCODE_CHANGHONGIR_MOUSE          = 4122,    AKEYCODE_CHANGHONGIR_EPG            = 4123,    AKEYCODE_CHANGHONGIR_HOME           = 4124,    AKEYCODE_CHANGHONGIR_SETTINGS       = 4125,    // Hisense section, range 4201-4300    AKEYCODE_HISENSE_G_SENSOR           = 4201,    AKEYCODE_HISENSE_LOW_BATTERY        = 4202,    AKEYCODE_HISENSE_SLIDEUP            = 4203,    AKEYCODE_HISENSE_SLIDEDOWN          = 4204,    AKEYCODE_HISENSE_SLIDELEFT          = 4205,    AKEYCODE_HISENSE_SLIDERIGHT         = 4206,    AKEYCODE_HISENSE_RAPID_SLIDEUP      = 4207,    AKEYCODE_HISENSE_RAPID_SLIDEDOWN    = 4208,    AKEYCODE_HISENSE_RAPID_SLIDELEFT    = 4209,    AKEYCODE_HISENSE_RAPID_SLIDERIGHT   = 4210,    AKEYCODE_HISENSE_FAC_NEC_M          = 4211,    AKEYCODE_HISENSE_FAC_NEC_IP         = 4212,    AKEYCODE_HISENSE_FAC_NEC_SAVE       = 4213,    AKEYCODE_HISENSE_FAC_NEC_3D         = 4214,    AKEYCODE_HISENSE_FAC_NEC_PC         = 4215,    AKEYCODE_HISENSE_FAC_NEC_LOGO       = 4216,    AKEYCODE_HISENSE_FAC_NEC_YPBPR      = 4217,    AKEYCODE_HISENSE_FAC_NEC_HDMI       = 4218,    AKEYCODE_HISENSE_FAC_NEC_F1         = 4219,    AKEYCODE_HISENSE_FAC_NEC_F2         = 4220,    AKEYCODE_HISENSE_FAC_NEC_F3         = 4221,    AKEYCODE_HISENSE_FAC_NEC_F4         = 4222,    AKEYCODE_HISENSE_FAC_NEC_F5         = 4223,    AKEYCODE_HISENSE_FAC_NEC_F6         = 4224,    AKEYCODE_HISENSE_FAC_NEC_F7         = 4225,    AKEYCODE_HISENSE_FAC_NEC_OK         = 4226,    AKEYCODE_HISENSE_FAC_NEC_MAC        = 4227,    AKEYCODE_HISENSE_FAC_NEC_AV         = 4228,    AKEYCODE_HISENSE_FAC_NEC_PATTERN    = 4229,    AKEYCODE_HISENSE_FAC_NEC_AGING      = 4230,    AKEYCODE_HISENSE_FAC_NEC_BALANCE    = 4231,    AKEYCODE_HISENSE_FAC_NEC_ADC        = 4232,    AKEYCODE_HISENSE_FAC_NEC_RDRV_INCREASE = 4233,    AKEYCODE_HISENSE_FAC_NEC_RDRV_DECREASE = 4234,    AKEYCODE_HISENSE_FAC_NEC_GDRV_INCREASE = 4235,    AKEYCODE_HISENSE_FAC_NEC_GDRV_DECREASE = 4236,    AKEYCODE_HISENSE_FAC_NEC_BDRV_INCREASE = 4237,    AKEYCODE_HISENSE_FAC_NEC_BDRV_DECREASE = 4238,    AKEYCODE_HISENSE_FAC_NEC_RCUT_INCREASE = 4239,    AKEYCODE_HISENSE_FAC_NEC_RCUT_DECREASE = 4240,    AKEYCODE_HISENSE_FAC_NEC_GCUT_INCREASE = 4241,    AKEYCODE_HISENSE_FAC_NEC_GCUT_DECREASE = 4242,    AKEYCODE_HISENSE_FAC_NEC_BCUT_INCREASE = 4243,    AKEYCODE_HISENSE_FAC_NEC_BCUT_DECREASE = 4244,    AKEYCODE_HISENSE_PRODUCT_SCAN_START = 4245,    AKEYCODE_HISENSE_PRODUCT_SCAN_OVER  = 4246,    AKEYCODE_HISENSE_TEST_BROAD_TV      = 4247,    AKEYCODE_HISENSE_TEST_BROAD_DTV     = 4248,    AKEYCODE_HISENSE_TEST_BROAD_AV1     = 4249,    AKEYCODE_HISENSE_TEST_BROAD_AV2     = 4250,    AKEYCODE_HISENSE_TEST_BROAD_AV3     = 4251,    AKEYCODE_HISENSE_TEST_BROAD_SVIDEO1 = 4252,    AKEYCODE_HISENSE_TEST_BROAD_SVIDEO2 = 4253,    AKEYCODE_HISENSE_TEST_BROAD_SVIDEO3 = 4254,    AKEYCODE_HISENSE_TEST_BROAD_SCART1  = 4255,    AKEYCODE_HISENSE_TEST_BROAD_SCART2  = 4256,    AKEYCODE_HISENSE_TEST_BROAD_SCART3  = 4257,    AKEYCODE_HISENSE_TEST_BOARD_YPBPR1  = 4258,    AKEYCODE_HISENSE_TEST_BOARD_YPBPR2  = 4259,    AKEYCODE_HISENSE_TEST_BOARD_YPBPR3  = 4260,    AKEYCODE_HISENSE_TEST_BOARD_VGA     = 4261,    AKEYCODE_HISENSE_TEST_BOARD_HDMI1   = 4262,    AKEYCODE_HISENSE_TEST_BOARD_HDMI2   = 4263,    AKEYCODE_HISENSE_TEST_BOARD_HDMI3   = 4264,    AKEYCODE_HISENSE_TEST_BOARD_HDMI4   = 4265,    AKEYCODE_HISENSE_TEST_BOARD_HDMI5   = 4266,    AKEYCODE_HISENSE_TEST_BOARD_DMP     = 4267,    AKEYCODE_HISENSE_TEST_BOARD_EMP     = 4268,    AKEYCODE_HISENSE_TEST_BOARD_AUTOCOLOR = 4269,    AKEYCODE_HISENSE_TEST_BOARD_SAVE    = 4270,    AKEYCODE_HISENSE_TEST_BOARD_TELITEXT = 4271,    AKEYCODE_HISENSE_TEST_BOARD_SAPL    = 4272,    AKEYCODE_HISENSE_TEST_BOARD_VCHIP   = 4273,    AKEYCODE_HISENSE_TEST_BOARD_CCD     = 4274,    AKEYCODE_HISENSE_TEST_BOARD_BTSC    = 4275,    AKEYCODE_HISENSE_TEST_BOARD_FAC_OK  = 4276,    // MStar Android Patch End    // NOTE: If you add a new keycode here you must also add it to several other files.    //       Refer to frameworks/base/core/java/android/view/KeyEvent.java for the full list.};#ifdef __cplusplus}#endif#endif // _ANDROID_KEYCODES_H</span>

4)在frameworks/base/core/res/res/values/attrs.xml添加如下
<enum name="KEYCODE_WLS" value="320" />
5)在frameworks/base/core/java/android/view/KeyEvent.java添加对应的 public static final int KEYCODE_WLS = 320;
经过如上的步骤就将"123"按键和Android系统中的KEYCODE_WLS就对应起来了，注意这里的"123“键值并不是真正意义上的123键值，他只是linux驱动向上层抛出的键值。

6)在Android的framework层的键值处理函数中，捕获按键，并进行相应处理。
在framework层的input系统中，加入对wifi按键的捕获。
添加的文件是：frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
添加的具体方法：在PhoneWindowManager.java的interceptKeyBeforeQueueing()函数中,不惑该键值，至于怎么处理处决您的业务处理了。

在这里再总结下我对Android键值处理的理解，我的理解：看了一下key character map的处理，是通过读取kl文件然后使用驱动程序提供的ioctl函数去修改来自输入设备的扫描码和系统预定义的keycode的映射关系。这样的话，对于硬件扫描码，只需要修改这个kl文件。上层得到的都是系统预定义的keycode。
重要补充：
　　映射关系： ir硬件扫描码在驱动里面被映射为 kernel/include/linux/input.h里面定义的某个键值。但是这个键值只在linux系统中使用。
　　Android通过源码目录下的device/xxx/xxx.kl( keylayout )文件完成linux键值到Android系统要使用的键值的映射

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