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Just encounter this problem, Baidu on the internet a bit, see someone share the cause of the problem caused several reasons:
1. Phone Setup issues. Open USB Debug Method: Phone Settings-developer Options-USB Debug-Tick
2. Data line issues. Some data lines can only be used for charging, and some may be connected to storage. The recognition method is simple. Plug in the machine with a USB storage device prompt can be used. In addition, if the data line is exposed to the skin. Just throw it away. Ten bucks, eight bucks, is better than a good afternoon for this problem.
3. Whether to download the corresponding mobile version of the SDK, in the case of Android Studio, click Open SDK Manager. See if the SDK that corresponds to the system version number you are using is downloaded. No, just hurry down. Mobile phone corresponding to the Android version view method is phone settings-about mobile-Android version
Sheh Link: https://www.zhihu.com/question/30588024/answer/70352952 Source: Copyright belongs to the author. Commercial reprint please contact the author for authorization, non-commercial reprint please specify the source. /***********************************************************/before looking at a Baidu experience of Android Studio's real machine configuration, was fraught. The target here cannot choose USB and should choose. The phone needs to be selected as developer mode, and each phone's developer mode seems to be a hidden skill. Open the way are more wonderful: 1, Vivo mobile phone:Enter *#* #7777 #*#* in the dial-up interface2, OPPO mobile phone: Enter the settings, about mobile phone-click "version number" four times to enter the developer mode. (There will be one more developer option in other settings at this time) found the USB debugging open, you can.
Android Real-Computer debugging