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In Android Studio, I can successfully do a clean build, but every time I try Run, I see the "Select Deployment Target" window say Initializing ADB, but then in Connected Devices I see .

I can create a Virtual Device, but after creating it I can't see it in the Connected Devices window. If I go to Android Virtual Device Manager I can see the new device and several others I have created.

I can open terminal and run adb connect 192.168.1.229 (my device's wifi IP) and get a connection. Then I can run adb devices and see it listed. But still the Connected Devices does not show it.

The idea.log repeats the following:

2018-10-29 18:36:00,808 [st Monitor]   WARN -            #com.android.ddmlib - Unable to open connection to: localhost/192.168.1.43:5037, due to: java.net.ConnectException: Operation timed out 
2018-10-29 18:36:00,808 [st Monitor]   WARN -            #com.android.ddmlib - Connection attempts: 12 
2018-10-29 18:36:00,825 [st Monitor]   INFO -            #com.android.ddmlib - adb restarted 
2018-10-29 18:37:17,045 [st Monitor]   WARN -            #com.android.ddmlib - Unable to open connection to: localhost/192.168.1.43:5037, due to: java.net.ConnectException: Operation timed out

I have no idea why it is trying 192.168.1.43 and there does not seem to be a server running there. Is this a setting I have to change?

Attempted fixes:

  • kill the adb server
  • restart Android studio
  • restart laptop
  • upgrade Android Studio and reinstall with default settings rather than keeping my old ones

System Details:

  • OSX 10.13.6
  • Android Studio 3.2.1
  • Android Debug Bridge version 1.0.40 Version 4986621
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2 Answers 2

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For posterity the answer was that localhost had been reassigned. I discovered this by typing "ping localhost" at the terminal. The solution was to add a line in etc/hosts, as Chappie said. I have still not been able to figure out what caused it to be reassigned, nor how. Warning that reassigning your localhost could cause some programs to cease working correctly.

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I think I have the same problem,I found the key is my localhost's IP has changed,so android studio can't connect to the right IP. Just edit /etc/hosts input this: 127.0.0.1 localhost and restart Android studio,the problem resoved.

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