无法从Android的KeyEvent的获取元状态 [英] Can't get meta state from Android KeyEvent

问题描述

看起来很傻，但我不能让元的状态出来的KeyEvent，从onKeyListener访问的。试图与我拥有所有键盘和模拟器。

Looks silly, but I can't get meta state out of KeyEvent, accessed from onKeyListener. Tried with all keyboards I have and with emulators.

不管是不是Shift，Ctrl等键是pressed，KeyEvent.getMetaState（）函数返回0，可它工作的TextListener，但我并不需要它的输入文字，我只想标签来区分和Shift + Tab键。

Whether or not Shift, Ctrl, etc keys are pressed, keyEvent.getMetaState() returns 0. May it works for TextListener, but I don't need it for entering text, I just want to differentiate between Tab and Shift+Tab.

感谢您的预期帮助。

的更新。的我只是想出的是，元州报告了字母键，但不为其他键。

Update. What I just figured out is that meta state is reported for alphabetic keys, but not for other keys.

例如，如果我preSS左Shift + T系统生成的KeyEvent重点code_SHIFT_LEFT和KEY code_T和KeyEvent的关键code_T有META_SHIFT_ON集。你可以欺骗使用Shift + TAB + T系统，在这种情况下META_SHIFT_ON设置为KEY code_T和KEY code_TAB。然而，随着Shift + Tab该KeyEvent关键code_SHIFT_LEFT不产生，和元状态不受影响。

For example if I press left Shift+T the system generates KeyEvent for KEYCODE_SHIFT_LEFT and KEYCODE_T, and KeyEvent for KEYCODE_T has META_SHIFT_ON set. You can trick the system with Shift+TAB+T, in which case META_SHIFT_ON is set for both KEYCODE_T and KEYCODE_TAB. However with Shift+TAB the KeyEvent for KEYCODE_SHIFT_LEFT is not generated, and the meta state remains unaffected.

也许系统键盘配置文件需要进行更新，以允许像Shift + Tab组合？

Maybe system keyboard configuration files need to be updated to allow combinations like Shift+TAB?

推荐答案

是的，这真的Andr​​oid的配置文件。

Yes, it's really about android configuration file.

您修改/system/usr/kychars/Generic.kcm TAB条目（或相应供应商提供的文件），并添加一行的转变，如下所示：

You modify TAB entry in /system/usr/kychars/Generic.kcm (or the file for corresponding vendor) and add a line for shift, as the following:

key TAB {
    label:                              '\t'
    base:                               '\t'
    shift:                              '\t'
    ctrl, alt, meta:                    none
}

一些设备使用qwerty.kcm，其具有换档线alaready present。他们应该没有入侵工作确定。 BTW，UNI code的规定Shift + Tab键一个特殊的code \\ u21B9，但它可能不是由Android的认可。

Some devices uses qwerty.kcm, which has the shift line alaready present. They should work OK without intrusion. BTW, unicode has provides a special code \u21B9 for Shift+TAB, but it might not be recognised by Android.

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