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android kl 文件的作用【转】

时间:2017-10-21 18:29:09      阅读:442      评论:0      收藏:0      [点我收藏+]

本文转载自:http://blog.csdn.net/u013308744/article/details/49274069

首先看touchscreen的kl文件


# Copyright (c) 2014, The Linux Foundation. All rights reserved.
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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;

然后就变成了keycode 187

android kl 文件的作用【转】

原文:http://www.cnblogs.com/zzb-Dream-90Time/p/7705390.html

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