Develop Reference

Android Studio 2.1.1: "no usb devices or running emulators detected"

Suddenly my Android Studio stopped detecting all my devices, none of them is working. It happen from one execution to another. I've changed a few lines of code (1 min maybe?), hit run (instant run) and then I missed all my devices.
I'm using a Mac and as devices: Nexus 5x, Galaxy s6 and Oneplus One. What can be happening? I've checked previous questions here and tried all this:
Run configurations: no matter if I chose usb device or show the window, it does not work.
Tools > Android > Enable ADB integration: didn't help
Command line adb devices does not detect any either.
I've revoked and granted again USB authorizations. Still not working.
I've tried other apps I have, none work.
Restarted phones
Restarted android studio
Restarted computer
(Note: if I start an emulator it works, but I'd prefer to use physical device since I have to scan real barcodes)
Thanks a lot in advance.

On Lollipop 5.1
Go to About Phone
Click 7 times on Build Number. Now Developer options are enabled
Go back and Click Developer options
Enable USB debugging under Debugging.

Well, I've fixed. The problem in case any faces the same was a Stetho (http://facebook.github.io/stetho/) tab in chrome, the one you open by typing: chrome://inspect/#devices not sure about the reason because it's been open for 2 days now, but it was the cause, once I closed it, it worked.
Found this unaccepted answer here: macbook adb cannot open interface That for sure should be accepted.
EDIT: I've been able to replicate the problem. It happens when you have the devices tab open and try to run a second app that has stetho configured.

It happens if your device drivers not installed Please do this.
In Case of PC
Right click my computer select manage select device manager from left panel if your phone drivers not installed there will be yellow alert on driver right click on it select update driver software then select search automatically for update driver software.
Other
Please install the missing drivers of your phone.

I had the same problem . What I've done to solve it going to Setting >> Additional Setting >> Developer Option
Now select:
Developer option on
USB debugging on
Install via USB on
USB setting security on
Verify apps over USB

OK, what finally worked for me was to go into Settings\Developer options\Select USB Configuration and change it to PTP or MIDI....either one of those worked for me and all of the sudden my phone showed up and I was able to see and run my test app on my android phone.

This woorked for me
Go To Settings
Developer Options
Enable USB Debugging
Enable Verify Apps over USB
Select USB Configuration: Choose MIDI
I hope it also works for you

How to connect Lenovo a7000 as external emulator in android studio?

Is there is any way to connect non nexus devices as emulator in android studio?

If you are window user, first install Lenovo Driver for Window,
If Developer Option is not enabled, Setting > About Phone > Press BuildNumber 7 times
Go to Developer Options and please enable USB Debugging.
If popup appear, please tap to allow device.
And then , you can run your Android Projects with your real device

You can simply plug in your phone with Developer Mode enabled. When you click on Debug, it automatically shows up your phone. It is as simple as that.

Turn on Developer mode by tapping 5 times on the build number.
Go to Developer options, turn on USB debugging.
Plugin the device
A popup will appear. Click on allow device.
You are all done !

LG G3 device not recognized by Eclipse on Windows

I recently bought LG G3 and I have enabled debugging mode but Eclipse is still not recognizing it, back when I used the Galaxy S3 for development I had to install Samsung Kies. The G3 drivers are installed and I can see it in My Computer, do I need something like the Kies but for the LG? If so can someone please post a link for that?

See update below
I found the answer that worked for me.
When you plug in the phone, bring down the status shade, pick the USB item ("USB connected") then, from there, pick "Internet connection" -- I chose Ethernet, but I'm not sure the choice matters on the dialog that pops up..
This enables USB debugging to become active; leaving it on Charging, MTP, or PTP does not work.
Once you do this, you can follow #Siddharth's steps to setting the ADB drivers, if needed. (You may need to use the actual LG drivers and not the Google drivers, but once I got this far, it was just like any other phone.)
Caveat
For me, even after going through this once, I still get the "installer" first and then have got go in and choose the "Internet connection" again. But, at least it works.
Update 10 Dec 2014
A recent firmware update has, indeed, removed the "Internet connection" as an option. Instead, PTP now works. I still get the "Connected as an installer" notification every time I plug in the phone and have to click on the notification then click on "Camera (PTP)" -- or wait about a minute. It's slightly better than what It was.
Also note: When this change occurred I had to install the drivers again for the phone, since it comes up as a different type of device when "Camera (PTP)" is chosen than when I used the "Internet connection" option.

For me, this has solved the problem: simply go to LG's website, http://www.lg.com/us/support/software-manuals, select the model (I have selected 'D850') and go to Software Updates tab where you can download the driver. I have installed it and then Eclipse recognized my device. I'm working on Windows 8.1, by the way.
yakobom

After a lot of searching and trying all solutions still I couldn't connect my LG G3 to eclipse on mac. Finally I find this solution, it works for me hope for you works too:
Install LG USB driver for mac
Go and enable developer mode in your G3 (Setting->About phone (in General Tab)--> Software information --> Tap 8 times on Build Number) then you will see the message which says the Developer option is enabled
In this step you expect that after connecting your mobile via USB cable, the Eclipse detect it
But for me it didn't happen
in this step you need to go (Setting--> Developer Options--> and turn off this option from above green (on/off) switch then again switch on this option from same place (If you don't do this step the "USB Debugging" mode will stay fray and you can not enable it)
In Developer Options menu scroll down until find the "USB Debugging" then tic it and enable it.
almost finished , you should back and configure running mode for your application and see the G3 in your connected usb devices

Try this solution :
Right click on My Computer --> Properties --> Device Manager
Right Click on your device --> Update driver software
Click on "Browse my computer for driver software"
Give path of your android sdk like "D:\Android_Sdk\sdk\extras\google\usb_driver" and tick "Include subfolders"
Click
Now repeat the steps till "Browse my computer for driver software".
Then click on "Let me pick form list of device drivers on my computer". Click on the first option and click next and then click yes. Drivers will be installed for your device.
Hope this helps.

Change the USB mode to PTP and you will get the RSA prompt.
Within the prompt, select allow it > ok and you are done.
This worked for me when I had the same problem on a Mac computer.

To contribute to possible solutions for this fix: I am using an LG G3 on a Mac.
In my case, ADB saw it as a device when I checked, and the Mac showed the device information in the System Information window, yet Eclipse did not see it. I also did not get the RSA confirmation pop-up when I connected the device through USB.
To fix, with my G3 connected, I selected the USB PC Connection (either from the navigation bar or through the settings) and changed it to be Send Images (PTP). Once this was on, I was given the RSA pop up and Eclipse recognized the phone in the Run Configurations window.

If you have this problem on Ubuntu; here is what I did to get it working:
Switch to PTP from MTP on the phone (this assumes you're connected via USB)
Disconnect the USB cable
Go to settings -> developer options and select revoke usb authorizations then ok
Make sure USB Debugging is checked
Reconnect the USB cable and your phone will say its connected as an installer; wait a minute or three and debugging mode should appear on the status bar (on the phone)
Open Eclipse and go to DDMS
Select "reset adb" in the dropdown if your phone isn't appearing yet

Working on Windows 7. All of the solutions from other sites didn't help (i.e. restarting adb and switching between MTP, PTP, Charing). In the end, I found this article (http://www.technobuzz.net/install-lg-g3-lg-drivers-windows-mac-usb-adb/), which contains links for the necessary drivers for the lg g3 (and some others I think). This did the trick and made the RSA key fingerprint dialog appear finally. After confirming, adb and eclipse recognize my device perfectly!

I had this buggy error with my LG Optimus L3 phone connecting to Win7/8 machines!
Cause: Device Driver was missing as it seemed at the end when I fixed it!
How to Fix:
Search through web (using Google) "LG < Your_Phone_Model Number > Drivers Download".(Ex.:- Go to About phone in your settings list > Model Number, for me it's LG-E400f)
Mostly the first few links are related to the required Device Driver download page.(Ex.:- for me I got the following link and for each device driver LG or most of the other vendors/manufactures have that kind of a Manuals and Drivers Page) Visit that page mentiioning about software update and drivers downloads.
Scroll down to the section of "Manuals and Software Update" and doing just the Step 1 was enough for me, which is "Install the USB DRIVERS "
Download it(for Mac or Windows) > Install It > Check Your Eclipse ADT > and it should be visible under Devices tab by now
Cheers!!!
Hope this helps to someone else to clearly get to the solution!

it seems that Eclipse shows the offline mode for lg G3 and some newer devices
and there is no way no use these devices for ADB debugging
there is a way
I am using windows 10
1- download this 11 MB file < http://dl2.uncox.com/android/upload/platform-tools-v22.zip>
2- then go to the directory that you installed the SDK
3- extract the zip file in to the platform-tools folder , override all files(click yes to all) be sure that Eclipse doesn't running
4- open Eclipse and select your android device that stands in devices tab at the right-top corner of your screen and then you can see the arrow near the screen- capture icon and you will find the reset-ADB. click on it ,after that your phone will ask you to allow android debugging for your device click on it
5- congratulations .now you can see that your device shown online
i hope this will help .sorry for my english

I also had a great deal of trouble when attempting to debug android applications on my shiny new LG G3. What ended up working for me was first installing the default google drivers onto the G3 and then following the process detailed by #lilbyrdie.
The process of installing the google usb drivers is very nicely gone through here.
However, with the most recently pushed android update to the G3 there are no longer the options for internet connection or charge only; but they seem to have fixed this defect forcing you to make this odd choice to enable debugging. The only options remaining are MTP and PTP, but if you pull down the notification drawer, choose the 'USB connected' notification (assuming the device is connected to your computer via USB of course) and from there click on 'Media sync (MTP)' even if it is already selected then debugging should be enabled.

Android can't update on the fly the developer mode. So, after turning on developer mode (and given you have the latest driver) switch the green button(under settings->general->developer options) to off and then back on. Then turn debug mode on (after that windows recognizes a new device) and you should be good to go.

In my solution for Windows 7 was helpful to update Android SDK Tools to latest version.

ADB Single/Composite values for LG G3 phones -
I found it was necessary to update (~userName/.android/)adb_usb.ini file with the line 0x1004:
# ANDROID 3RD PARTY USB VENDOR ID LIST -- DO NOT EDIT.
# USE 'android update adb' TO GENERATE.
# 1 USB VENDOR ID PER LINE.
0x2207
0x1004
In addition, I needed to add the following entry in (.../sdk/extras/google/usb_driver/)android_winusb.inf:
;
; Android WinUsb driver installation.
;
...
[Google.NTx86]
...
;LGE Android Phone
%SingleAdbInterface% = USB_Install, USB\VID_1004&PID_633E
%CompositeAdbInterface% = USB_Install, USB\VID_1004&PID_631D&MI_00
%CompositeAdbInterface% = USB_Install, USB\VID_1004&PID_631D&MI_01
[Google.NTamd64]
...
Oh, and set USB to PTP as well as turn-on USB debugging.
When you're all done with the file modifications and several passes at installing the drivers (ref. earlier posts), you can verify your phone is ready via the Device Manager. It will list your phone as "Android Device"->"Android Composite ADB Interface". I believe an earlier post explains setting up the drivers

how to make eclipse recognize my device for debugging?

I write an android app using eclipse.
I have plugged in my new device (not rooted)
and I try to install my app on the device.
Unfortunately, eclipse shows the device is "unknown"
how can I fix this?

First of all, be sure your device has USB debugging set. This is in Settings => developer options.
If you can not access Android developer options, Go on Settings, About phone, and click 7 times on Build Number
Sometimes, Eclipse won't recognize device if you plug it in while Eclipse is open. 2 solution
Go in DDMS console, and in the Devices window, click on "View Menu" (arrow going down at the right), then reset ADB. It should freeze eclipse for few seconds, then your device will be recognized.
View Menu button is here
Restart Eclipse

How to load my app from Eclipse to my Android phone instead of AVD

I'm quite new to Android and have been using an AVD to debug my app so far. However, I want to start checking the media options and therfore need to start using my Android phone. How do I get Eclipse to load my app to my phone instead of my AVD?

First you need to enable USB debugging on your phone, then connect it to your computer via USB. Then eclipse should automatically start debugging on your phone instead of the AVD.

just for additional info,
If your apps is automatically run on emulator,
right click on the project, Run As -> Run Configuration,
then on the Run Configuration choose on the Manual.
after that, if you run your apps you will be prompted to chose where you want to run your apps, there will be listed all the available device and emulator.

I had the same problem, and have not been able to get Eclipse in Windows 7 to recognise the device. The device is correctly configured, Windows 7 recognises it on the USB port, and I edited the Run settings in Eclipse to prompt for a device, and it is just not there.
I ran it with the following steps:
Connect the device to the computer with USB.
Ensure the device is not locked (ie. timed out in the UI). I have to keep unlocking it while I'm working.
Wait for Windows to recognise the USB device, and when the autoplay menu comes up select Open device to view files. It should open up the file system in the device, in Explorer.
In Explorer go to the Eclipse workspace and find the apk file from the build (eg. MyFirstApp.apk)
Copy the apk file to the Downloads directory on the device
On the device, use the My Files app (or similar) to open the Downloads directory.
Click the downloaded file (My First App.apk) and Android offers to install it
Select install
The app is now in the installed Apps. Run it.
A second method is to mail the apk file to the device and then download and install it. (Credits to a post on SO which I can't find now).
A third method is to use DropBox. This requires installation of DropBox on the PC and on the device (from the play store) but once both are set up it runs very smoothly. Just share a DropBox folder between the two devices, and then drop the APK into that folder on the PC, and open it on the device. With this method you don't need a USB connection, and can also install the APK on multiple devices. It also assists the management of multiple development versions (by making a separate sub-folder for each version).

In Eclipse:
goto run menu -> run configuration.
right click on android application on the right side and click new.
fill the corresponding details like project name under the android tab.
then under the target tab.
select 'launch on all compatible devices and then select active devices from the drop down list'.
save the configuration and run it by either clicking run on the 'run' button on the bottom right side of the window or close the window and run again

You don't have to do anything really except prepare your phone to be able to run debug and usb apps :
http://developer.android.com/guide/developing/device.html
then simply launch your app from eclipse and your device will be used if you don't have a simulator running.

First of all, Enable USB debugging on your device.
On most devices running Android 3.2 or older, you can find the option under Settings > Applications > Development.
On Android 4.0 and newer, it's in Settings > Developer options.
In eclipse go to Run Configuration and select Always prompt to pick device

Some people may have the issue where your phone might not immediately get recognized by the computer as an emulator, especially if you're given the option to choose why your phone is connected to the computer on your phone. These options are:
charge only
Media device (MTP)
Camera file transfer (PTP)
Share mobile network
Install driver
Of these options, choose MTP and follow the instructions found in the quotes of other answers.
Hope this helps!
goto run menu -> run configuration.
right click on android application on the right side and click new.
fill the corresponding details like project name under the android tab.
then under the target tab.
select 'launch on all compatible devices and then select active devices from the drop down list'.
save the configuration and run it by either clicking run on the 'run' button on the bottom right side of the window or close the window and run again

For those who are trying to find how to enable debugging on devices running Jelly Bean 4.2 (e.g Google Nexus), you have to go to Settings > Apps > About tablet and tap the text "Build number" 7 times slowly. Go back to the now available Settings > Developer options and check USB debugging as stated in previous posts.

Check to see if the Andriod Device is installed on PC. See steps below. The 'Other device' will change to 'Andriod Device' once the USB drive is installed. The browse path should be
\extras\google\usb_driver\
not the sub directories under it. Otherwise the installation will not find the package.
To install the Android USB driver on Windows 7 for the first time:
Connect your Android-powered device to your computer's USB port.
Right-click on Computer from your desktop or Windows Explorer, and select Manage.
Select Devices in the left pane.
Locate and expand Other device in the right pane.
Right-click the device name (such as Nexus S) and select Update Driver Software. This will launch the Hardware Update Wizard.
Select Browse my computer for driver software and click Next.
Click Browse and locate the USB driver folder. (The Google USB Driver is located in \extras\google\usb_driver.)
Click Next to install the driver.

connect your device to system and set you device debug mode on when you run your application Android Virtual Device AVD will select device there you will see your connected device select your mobile device and thats all refer this link to set your device debugging mode on
http://developer.android.com/training/basics/firstapp/running-app.html

The USB drivers in \extras\google\usb_driver didn't work for me.
However the official drivers from Samsung did:
http://developer.samsung.com/android/tools-sdks/Samsung-Andorid-USB-Driver-for-Windows
Note: I'm using a Samsung Galaxy S2 with Android 4.0 on Windows 7 64bit

What I did, by reading all of above answers and it worked as well: 7 deadly steps
Connect your android phone with the pc on which you are running eclipse/your map project.
Let it install all the necessary drivers.. When done, open your smart phone, go to: Settings > Applications > Development > USB debugging and enable it on by clicking on the check button at the right side.
Also, enable Settings > Unknowresoures
Come back to eclipse on your pc. Right click on the project/application, Run As > Run configurations... >Choose Device>Target Select your device Run.
Click on the Target tab from top. By default it is on the first tab Android
Choose the second radio button which says Launch on all compatible deivces/AVDs. Then click Apply at the bottom and afterwards, click Run.
Here you go, it will automatically install your application's .apk file into your smart phone and make it run over it., just like on emulator.
If you get it running, please help others too.

Thanks this helped. It was a little tricky getting the USB debugging option enabled on the Samsung G3 after the update.
See below
Instructions on Samsung G3 Jellybean
Settings
Click --> About the phone
Tap on the build number
“You are now 4 steps away from being a developer.” Keep tapping until it says “You are now a developer.”
Go back to Setting-->System --> Developer option: Enable USB Debugging

Step by step:
Connect your phone to computer via USB
Enable USB debugging on your phone: Settings -> Applications -> Development -> USB debugging
Change Run configuration in your Eclipse project:
right click -> Run As -> Run Configurations. In the Target tab choose Always prompt to pick device (or Manual). Then Apply, Run.
In the new window you should see your connected phone.

Yes! You can Debug Android Application While you are developing them follow these steps..
Make sure that you have PC suite of the mobile manufacturer. For Example:if you are using samsung you should have samsung kies
1.Enable USB debugging on your device:Settings > Applications > Development > USB debugging
2.Enable Unknownresources:Settings>Unknowresoures
3.Connect your device to PC
4.Select your Application Right click it: RunAS>Run configurations>Choose Device>Target Select your device Run.
You can also without using debugging cable.For that you need to install Airdroid in your device.After installing enter the link in your browser and Drag and Drop .apk file.
Happy Coding!

First you need to set your device to debugging mode. On Android 4.X that means as described in another answer in another question:
Open up your device’s “Settings”. This can be done by pressing the Menu button while on your home screen and tapping “System settings”
Now scroll to the bottom and tap “About phone” or “About tablet”.
At the “About” screen, scroll to the bottom and tap on “Build number” seven times. [Note this is no joke]
Make sure you tap seven times. If you see a “Not need, you are already a developer!” message pop up, then you know you have done it correctly.
Done! By tapping on “Build number” seven times, you have unlocked USB debugging mode on Android 4.2 and higher. You can now enable/disable it whenever you desire by going to “Settings” -> “Developer Options” -> “Debugging” ->” USB debugging”.
The next step is to connect your device to your computer via the USB cable.
The next step is to install a USB driver for it. On the official website you find a list with sources for drivers for phones from various different companies.
Eclipse now should give you the phone as a choice when you click on Run and it presents you possible device to launch.
In some case Eclpise will tell you Target Unknown which prevents you from using the device. If that's the case you might have to restart the phone. You might also have to check and recheckUSB debugging, till the phone asks you to allow your particular computer to do usb debugging.