I found that when using AudioRecord class for the recording, if the system has been open screen, can be normal recording, but once the screen closed or the user lock screen again after a period of time, such as the AudioRecord object access to all the audio data is 0, that is not recorded sound, as long as the unlock, and a voice came right away, excuse me what method can be shut on the screen or the user can still record after the lock screen?
I found WeChat can in the user after the lock screen can still recording, don't know how to achieve, 100 points for advice!