android系统中,获取到键盘的键值后,会搜索/system/usr/keylayout/gpio-keys.kl这个文件
key 115 VOLUME_UP WAKE_DROPPED
key 114 VOLUME_DOWN WAKE_DROPPED
key 102 HOME WAKE
如果code与其中的键值相对应,android就会响应对应的按键信息。
WAKE: When this key is pressed while the device is asleep, the device will wake up and the key event gets sent to the app.
WAKE_DROPPED: When this key is pressed while the device is asleep, the device will wake up and the key event does not get sent to the app.
本文介绍了Android系统中按键映射的工作原理,详细解释了/system/usr/keylayout/gpio-keys.kl文件中定义的按键值如何与系统操作对应,如音量调节、主页键唤醒等,并区分了不同唤醒行为。
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