android - "adb devices" command returns no devices -

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i getting started in android development, , trying eclipse (running on windows 7) recognise phone can use debugging. however, phone not seem recongised eclipse or running "adb devices" command line.

here's i've tried:

  • i've tried both mtp (media device) , ptp (camera) transfer modes (similar questions on stack overflow have been resolved using ptp).
  • i've ensured usb debugging turned on in phone's settings.
  • i've manually installed driver in device manager, choosing "update driver software" , selecting .inf file in sdk\extras\google\usb_driver (which had modify hand include device).
  • i've tried nexus 4 phone, nexus 7 tablet, , motorola moto g phone. behaviour identical 3 devices.
  • i've tried "universal adb driver", in case behaves differently google driver, doesn't behave differently.
  • i've rebooted, i've reinstalled drivers, i've tried adb kill-server followed adb start-server, etc.

no matter combinations of above try, "adb devices" lists nothing. when in windows device manager, can see "android composite adb interface" listed under "android device" node, believe have installed driver correctly. logged in administrator, it's not permissions thing either. i've tried every answer every single similar question on stack overflow, nothing works. i've been pulling hair out day , close running out of hair... ideas appreciated.

edit: occurred me causing this. running 64-bit windows 7, 32-bit java. because have 32-bit java installed on pc, installed 32-bit sdk. explain behaviour? should running 64-bit java? reason why didn't because 32-bit java installed company's group policy...

edit2: have noticed when plug android device in, , @ device id in device manager, device id not end in "&mi_01". when plug device windows 7 pc, device id does end in "&mi_01". believe why "adb devices" not able detect device. idea why 1 pc see different device id another, difference being "&mi_01"?

did install phone usb-driver? , can check on device manager installed or not? can download usb driver yur phone company website. after install phone usb driver , think problem solved


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