Android添加新键值实现

Android添加新键值实现
1. 为了方便调试，我打开了debug选项，将
KeyInputQueue.java，
WindowManagerService.java
PhoneWindowManager.java
的debug选项修改为true，最好把修改的地方注上名字，等调试完成后将其复原。
2. 在.kl文件中定义键值：idh.code\3rdparty\products\sp8805ga\sprd-keypad8805ga.kl
key 185   IM
注意：新加的键值不要与已有的重复。
3. 在键盘驱动中定义相应的键盘扫描码:kernel\drivers\input\keyboard\sc8800g-keys.c
static const unsigned int sprd_keymap[] = {
...
KEYVAL(5, 0, KEY_F15),//IM
...
}
4. 在数组keycodes 中添加 新定义的信息:frameworks/base/include/ui/KeycodeLabels.h
static const KeycodeLabel KEYCODES[] = {
...
{ "IM", 92 },
// NOTE: If you add a new keycode here you must also add it to:
//   (enum KeyCode, in this file)
//   frameworks/base/core/java/android/view/KeyEvent.java
//   tools/puppet_master/PuppetMaster.nav_keys.py
//   frameworks/base/core/res/res/values/attrs.xml


{ NULL, 0 }
}
注意：要在{NULL, 0}之前添加

static const KeycodeLabel KEYCODES[] = {
...
kKeyCodeIM = 92
}
5. frameworks/base/core/res/res/values/attrs.xml

...

   
6. frameworks/base/core/java/android/view/KeyEvent.java
public class KeyEvent implements Parcelable {
...
public static final int KEYCODE_IM = 92;
// NOTE: If you add a new keycode here you must also add it to:
//  isSystem()
//  frameworks/base/include/ui/KeycodeLabels.h
//  tools/puppet_master/PuppetMaster/nav_keys.py
//  frameworks/base/core/res/res/values/attrs.xml
//  commands/monkey/Monkey.java
//  emulator?
//
//  Also Android currently does not reserve code ranges for vendor-
//  specific key codes.  If you have new key codes to have, you
//  MUST contribute a patch to the open source project to define
//  those new codes.  This is intended to maintain a consistent
//  set of key code definitions across all Android devices.
  
private static final int LAST_KEYCODE           = KEYCODE_IM;
}

public final boolean isSystem() {
//如果是系统按键

case KEYCODE_IM:
            return true;
}
7. 新键值进行处理：frameworks/policies/base/phone/com/android/internal/policy/impl/PhoneWindowManager.java
public boolean interceptKeyTi(WindowState win, int code, int metaKeys, boolean down, 
            int repeatCount, int flags) {
...
// First we always handle the home key here, so applications
        // can never break it, although if keyguard is on, we do let
        // it handle it, because that gives us the correct 5 second
        // timeout.
        if (code == KeyEvent.KEYCODE_HOME) {
...
} else if (code == KeyEvent.KEYCODE_MENU) {
...
} else if (code == KeyEvent.KEYCODE_IM) {
TODO: do something
}
}

注意：
1. 在.kl文件中，是按行读的，所以如果不能找到对应键值，则抛出异常，导致后面的键值不能正确读出
如果.kl文件中存在“key 184   ADDRESSBOOK”，但是其他地方未实现，则会抛出下面异常
E/KeyLayoutMap( 1149): /system/usr/keylayout/sprd-keypad8805ga.kl:156: expected keycode, got 'ADDRESSBOOK'
2. 在.kl文件中，是区别大小写的，所以如果没注意添加了Key 184   ADDRESSBOO 或KEY 185   IM
则会导致报以下错误，并使Event不能正确映射。
E/KeyLayoutMap( 1207): /system/usr/keylayout/sprd-keypad8805ga.kl:159: expected flag, got 'KEY'