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android kl 文件的作用

IT知识android

生也有涯，知也无涯。这篇文章主要讲述android kl 文件的作用相关的知识，希望能为你提供帮助。
本文转载自：http://blog.csdn.net/u013308744/article/details/49274069
首先看touchscreen的kl文件


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key 158     BACK               VIRTUAL  WAKE
key 102     HOME               VIRTUAL  WAKE
key 580     APP_SWITCH         VIRTUAL  WAKE
key 116     GESTURE_DOUBLE_CLICK             VIRTUAL  WAKE
key 46       GESTURE_C                 VIRTUAL  WAKE
key 18       GESTURE_E                 VIRTUAL  WAKE
key 31       GESTURE_S                 VIRTUAL  WAKE
key 47       GESTURE_V                 VIRTUAL  WAKE
key 17       GESTURE_W                 VIRTUAL  WAKE
key 44       GESTURE_Z                 VIRTUAL  WAKE





那么这个kl有啥用呢，众所周知，android kernel和framework是不同的两层，也就是说，kernel里认识的
key值是158之类的这种数字，这个158是scankode，它往framework上报的时候也只会报这样的数字，但是framework不认识这个数字是什么，所以framework需要先解析kl文件，map起来，这样kernel传值上来的时候才会知道到底是什么key，也就是说转换scancode 158变成KeyCodeLabel也就是BACK，然后back再转换成4这个keycode
首先
key 580     APP_SWITCH         VIRTUAL  WAKE
这里的580是scancode，转换撑了APP_SWITCH这个keycodelabel
InputEventLabels.h里的
  DEFINE_KEYCODE(APP_SWITCH),
#define DEFINE_KEYCODE(key) { #key, AKEYCODE_##key }
这里拼接了AKEYCODE_APP_SWITCH
 
Keycodes.h (native\include\android):     AKEYCODE_APP_SWITCH       = 187,
KeyEvent.java (base\core\java\android\view):     public static final int KEYCODE_APP_SWITCH       = 187;
【android kl 文件的作用】然后就变成了keycode 187

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