When I run adb devices there are no devices showing as connected. My device is a LG Optimus Exceed 2 running 4.4.2
There are many of these posts around, so here's what I've done:
- I'm using the cord that came with the phone. It charges and tries to sync photos, so it isn't an issue here. Switching usb ports and trying a powered usb hub doesn't affect it either.
- I've added the vendor id (0x1004) to ~/.android/adb_usb.ini
- Restarted and unplugged any combination of things you can think of
- USB Debugging is on. And has been restarted. Same with Unknown sources.
- I have never used EasyTether, nor is it installed anywhere on my computer.
- Updated adb, updated my sdk.
- Restarted adb server
- Tried installing LG's drivers: http://www.lg.com/us/support-mobile/lg-VS450PP (They say they don't support Mac S/W upgrade, yet they have a package to install. No help there)
- I have a Nexus S running 4.1 that works, and an old LG phone running Gingerbread that connect.
Any wizards out there who've already struggled with this who have advice?
I tried all of the connection types (charge, MTP, PTP) but perhaps not "Internet Connnection, modem"? You can change it by pulling down the system-wide drop down menu and touching "USB connection".
This is how I fixed it, but I thought I'd tried this already, so I can't guarantee it wasn't this in conjunction with one of the things done above.
PTP seemed to do the trick. Never had to do that on any other device...
I had the exact same problem. Selectin Internet Connection and then Ethernet as the USB connection type fixed it and everything is working as expected now.
I know this sounds like a stupid answer, but the same thing happened to me. It turns out the micro USB cord was just bad - which is weird, because it still charged the phone perfectly fine. After testing the bad cable unsuccessfully on a phone that had been recognized on my mac before, I switched to a different micro USB cable, and that made all the difference.
This is late in the game but I had an additional step to all the other suggestions. The phone was showing up in the System Profiler after I switched the usb mode to 'MTP' mode, but I didn't see any usb tethering options. After adding the phone's vendor ID to the usb ini file, enabling the developer and usb debugging, killing and restarting adb, I still didn't see my device in adb devices.
I finally had to download the Mac driver for the phone directly from LG.com. After installing and rebooting on the computer, the device showed up in adb devices.
来源：https://stackoverflow.com/questions/24434850/trouble-connecting-to-lg-phone-with-adb-mac-os-x-10-7-5