How can I uncheck "use the same device for future launches"?
Right click on your project and go to Run As -> Run Configurations .
Run As -> Run Configurations
Then under Android Application -> (Your Project) go to the Target tab and check the first option of the radio Always prompt to pick device .
Android Application -> (Your Project)
Target
Always prompt to pick device
In Android Studio: Run menu โ Edit Configurations
Run
Edit Configurations
and here, on the app tab, uncheck "Use the same device for future launches"
app
Bottom line: my ADT on Mac has some kind of error.
Edit: this "bug" is fixed for OSX Yosemite and Eclipse Luna
If you are using eclipse JUNO, exit the eclipse and it will be disabled. When you run eclipse again and debug the project, you will again be asked to select a device of choice, and you can choose another device.