Android sleep wake up
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Android sleep wake is mainly based on wake_ Lock mechanism, as long as there is any effective wake in the system_ Lock, the system can not enter the deep sleep, but can carry out the shallow sleep operation of the device. wake_ Lock is usually used when the LCD and TP are turned off, but the system still needs to run normally, such as listening to songs and transferring large files. This paper mainly analyzes the driver layer wake_ The implementation of lock.