Develop Reference

Android Studio doesn't recognize my device

Here is the problem. I want to run my Android Studio apps on my device (Samsung Galaxy Ace 2). But nothing works for me. Tell me what I've missed:
1) USB debugging is on
2) ADB driver is installed (in device manager i can see Android Composite ADB Interface)
3) ADB device list is still clear, even if i reset server(adb kill-server, adb start-server, adb devices - list of devices is clear)
4) in google usb driver directory, in android_winusb.inf file I added my device identificators
5) Android device manager still cannot connect to my device, showing this error when I reset it: "adb connection error an existing connection was forcibly closed by the remote host"
So I will be glad to hear any advices. Hope you'll help me

Did you try to configure the "Media Mode" in "Camera (PTP)" instead of "Media device (MTP)"? This is sometimes solving the issue. Its in the USB Computer Connection options of your Android device, you should see an "authorize" dialog then.
Update 04/2017: looks like it has been fixed in Android 7.1.2

I have done numerous ways of handling that issue. Finally it has worked! I am using LG Optimus II, but I believe the following steps are generic to other Android devices as well.
Step 1:
Make sure your device is enabled for development. If yes, go to Step 2, otherwise go to Settings > About phone and tap Build number seven times which is magic number :-).
Now Developer Options is available in the Settings.
Step 2:
Before you plug your device to PC, Go to Settings > Developer Options and select USB Connection method.
Step 3:
Plug the phone to the PC, you are given options for the USB Connection method, and please select Internet connection. Make sure you have connected to the Internet. By the way, I have changed MTP to PTP, it did not work for me. Therefore, I tried Internet connection mode, then it worked.
Step 4:
Run the app in the Android Studio, it will ask you to authorize the device for development, and select YES!.
Step 5:
Run the application via Android Studio and choose the device, not emulator, and BINGO! Welcome to Android development board.

Try swapping the USB port the cable is plugged into.
Sounds crazy but after 20 minutes of debugging this worked for me.

I also tried above solutions but got no luck. So here's what I did:
Download and install PdaNet+ to fix connection issues between my computer and android device
Enable USB debugging on my android device
Unplug the phone and plug it again after it's installed
Run my app and voila! My android device is now recognized by Android Studio

Although my computer could recognise my phone, I had to install the official drivers from the Samsung developer site to get adb/Android Studio to recognise it:
Samsung Android USB Driver for Windows

Click Revoke USB debugging authorization in Developer option and try it again.

Solution for those working with Huawei phones - You will get this error when ADB interface is not installed. Check if you have installed Huawei HiSuite. USB driver gets installed when you install HiSuite (I suppose this is true for most of the new phones that come with a Sync Software). If the ADB interface is installed on your computer you should see 'Android Composite ADB Interface' under Android Phone in your Device Manager as shown in this picture.

If you have Mi Device than you need to enable this two option after enabling Developer Mode.
USB Debugging (Enable = True)
Install via USB (Enable = True)
See this screenshot.

LG Optimus Zone 2 pp415 d\n connect in mtp, but does work in internet connection mode. Lost lots of time messing with it. There's no doc for this, but I'd suggest trying all 4 of the connection options. Only 1 that works for me is Internet Connection->Ethernet, then win 8 auto-detects a driver and installs it. In MTP mode despite all drivers being registered with device manager, adb doesn't pick it up.

I had the same problem. So here is what i did
reinstalled the device driver
changed the USB computer connection from MTP to Mass storage(UMS)
And it worked.

For me, I tried the above. Turns out my USB cable was bad. I changed the cable and then it worked.

I am sorry that i bothered you all. The problem was my device is cloned in different places in device manager. It was gone when I tried to update driver for my phone in "Other devices" list, and before i have been updating it in wrong sections. Thank you all.

In my case it was due to already running and hanged adb.exe on another user under my PC. I had two users on my PC, the second user had the adb.exe process hanged even when I tried to end the process. It worked with me after (End Process Tree) from the Task Manager.
Hope this will help someone with multiple users :)
Ahmad

In addition to the above configurations, I had to set deployment target to "Open Select Deployment Target Dialog", run once (choosing my device from the options listed), and from then on Android Studio was able to see my device even after changing the deployment setting back to "USB Device". My SWAG is that since Android Studio uses its own internal cache to find your device, it has to be initialized first.

I was on Samsung S8 and had same problem too. After I installed Samsung Kies, issues was resolved for me, as I believe it had updated the correct driver required for my Samsung S8.

On Windows 7 , the only thing that worked for me is this. Go to Device Manager -> Under Android Phone -> Right Click and select 'enable'

i had to install android studio in 2 machines and ive solved this problem intalling samnsung kies, i use 3 diferents samnsung devices (plus some other of my family and friends) and i dont have to strugle with the drivers, it works for me and i recomend it. hope it helps

For me, this ended up being because I had the wrong SDK level installed (new version of Android Studio installed the SDK for Android 10, whereas I have a device that runs only Android 8.1). While Android Studio would "recognize" the device and display a string in the "devices" menu instead of just saying that no device was connected, installing the right SDK level for my device ended up changing the string to something recognizable (my device's model name) and allowed me to actually run my app over ADB.

I had a big problem with my Samsung S10 Plus as it was not detecded by Android Studio on my Macbook even if I did all what is required to be detected, that is to say:
Enable developer mode (7 taps on Build version in Android settings)
Enable USB debugging
What I did is to start "Android File Transfer" on my Macbook and the magic happened. A popup appeared on my device asking if I want to authorize an USB access to it. I clicked "Yes, always" and now Android Studio can detect my device on my Mac :)

Change the connection method Build-In CD ROM it works for me

On HTC mini one 2, besides enabling the Developer Options, the following worked for me:
Go to More in Wireless & Networks
Mobile Network Sharing
In USB network setting
Select Internet pass-through

Android USB Debugging on Samsung Infuse 4G

I am trying to test an Android application through the Eclipse plugin on a real device. It is a Samsung Infuse 4G. I believe I have followed all steps on the Android page for testing on devices.
First of all, I cannot figure out what the Android OS version is because it does not show up in the settings. I can see that the firmware version is 2.2.1, so I assume I am running that version of Android OS as well.
Next, when I connect the device to my computer (running Vista, 64 bit), I get prompted with three options: Kies (firmware update), Media player, and Mass storage. When I look on the Internet, I see that I am supposed to select "Charge only", but this does not appear in the options with which I am prompted. I have already set USB Debugging to true through Settings > Applications > Development.
Third, I have installed the correct driver from the Samsung site based on my model number (SGH-I997), yet when I do adb devices from my platform-tools directory (I have tried adb kill-server and adb start-server), I still do not get my device listed.
I am not very advanced in terms of working with Android and have been banging my head against the wall on how to solve this problem, so any and all help guiding me through this would be appreciated.
Thanks!

Try installing this PC Suite ...Samsung Kies http://www.samsung.com/in/support/usefulsoftware/KIES/JSP this would help you to get the exact driver for the device and don't forget to check USB Debugging option in settings.

You also need to mark "Allow Mock Locations "in Development Options in Applications settings of your phone.
Also try enabling ,use as mass storage after connecting your device.
You can check if your device is detected in device tab of DDMS in Eclipse.
Even trying all such things ,it does not work try connecting your device 2 or 3 times ,restarting eclipse and enabling USB Debugging and mock locations again

How can I get Eclipse to recognize my Nexus 7?

This is the process I have gone through:
I downloaded the USB driver through Eclipse.
Then I went into the developer options on my Nexus, and I turned on USB debugging as well as the mock locations option, and then changed the debugging option to true in my main.xml.
After this I went and changed the connection to PTP.
I then connected my device and allowed it to install the drivers it needed to recognize itself in device manager.
I went into device manager and find my device listed as a camera and update the driver so that it now lists my device as an Android Composite ADB Interface. This is where I am having trouble.
Even though it is listed as such in my device manager, I am still unable to discover it in Eclipse. I think it may have something to do with the fact that it is still being listed as a camera as well as an Android device in device manager.
I've tried uninstalling both drivers for the device and then installing it again, but to no avail. I've also tried resetting adb in Eclipse and in command prompt and that didn't work either. I would try and remove the drivers for the device off my computer, but I don't know where to find them.
Can anyone give me any ideas?

download the usb driver from http://www.asus.com/Tablets_Mobile/Nexus_7/#support_Download_32 , then install it in device manager. Dont forget to tick the "debugging mode" (in developer option).
my nexus 7 will prompt me whether want to allow to be accessed or not, just ok and all will be fined.

Wow, so this took a while but I finally got it working. I removed SDK from my computer with all of the installments, and then installed it again in a different location. Somehow this worked.

for me after i went to settings--->About Phone---> and then clicked on "Build number" at least 5 to 7 times to enable developer mode i had this issue. Turns out i didn't realize that after enable developer options this only makes the option APPEAR IN YOUR ANDROID AS IN PREVIOUS VERSIONS. I then went back into settings and found developer options and checked off use for debugging etc and it worked as i ran "adb devices" at command prompt and it shows up

Phone can't connect to Eclipse on debug mode

I have tried connecting the USB debugger on Samsung Galaxy S2 and Samsung Galaxy Nexus. It still manages to fail on both devices. At the moment I am using Windows XP and I am running out of ideas.
Here is what I tried:
Installed SAMSUNG_USB_DRIVER_FOR_MOBILE_PHONES_1.4.8.0.exe
Searched and tried to install the drivers on Google drives.
Has anyone have this similar problem and could share a solution?
EDIT* Both devices Samsung Galaxy S2 and Samsung Galaxy Nexus are able to connect to the PC but not to the debugger. Drivers installed with different variances even done installing Samsung Kias.
I am adding a bounty tomorrow for 50 reps. I really need to test what I am doing on an actual phone.

You need to download Samsung Kies I know that the software description doesn't mention that it is the correct drivers for developers, but it in fact is.

An old issue used to be:
Use the USB2.0 ports on the back of the PC not the 1.0 front facing port.

I feel you have not installed sdk properly. Reinstall the http://dl.google.com/android/installer_r18-windows.exe, the open the adb and update all the things for the particular sdk you want.
Then verify that you have given the exact location of sdk in eclipse>window>preferences>android
Then restart eclipse.
Even you cant open it then set environment variables. For that add following ;E:\android-sdk-window\platform-tools; in PATH. Then restart windows.
After that try adb devices, adb kill-server command in Command prompt.
You will be able to see your device.

Is there any "ADB interface" devices in your PC's Devices Manager?
If you are using DDMS,Maybe there is a console(cmd.exe) window behind DDMS,you can get some log there.

Did you enable the debug mode on your device? This is not listed in the steps you followed.
Go to Settings -> Applications -> Development -> and set USB debugging.

You can use PdaNet software to connect your device for debugging. I was have the same issue and resolve with using this software. Use the following link to download this software:
http://junefabrics.com/android/download.php

I also have samsung Galaxy SII and i face the Same Problem before some days. But now i am able to get debug the app in My SII.
Please follow the steps and make sure that you follow it completely then only you cna able to get debug in your phone.
First select the Option to Install App from Unknown Sources.
You will find that option in Setting -> Applicatios -> Unknown sources. Select it as yes.
then Select the Option like USB Debugging.
You will find that option in Setting -> Development -> USB debugging. Select it as yes.
Now, Install latest Samsung Kias In your PC. Reboot Your PC, Eclipse and may be Phone also
Now, Try with connecting the Device.
Hope you will get debugging your app in to your phone.
If not then let me know which trouble you get.
Enjoy. :)

My phone has this:
Settings -> SD card & phone storage -> Mass storage only (USB connection mode is mass storage only)
Make sure that this option is NOT checked. If it is u can enable USB debugging and unknown sources and it still wont work.

If you just need to connect to the device for install and debugging you can manually select the driver to use when you plug it in.
Don't let windows search for it, choose I will pick the driver from a list, then select android composite ADB interface. It may warn you that this driver doesn't match, but it works!

I also had many problems to get samsumg galaxy S2 work on my pc. If I remember correctly finally I ended up installing Samsung Kias and installed some drivers through there. Then restarted the computer and never launched kias from then on. My phone is still not visible form command line adb devices, but now I can develop in Eclipse and deploy on the device without any problems.
From time to time I lose connection to the device (E.g. if another device was plugged in). Then I need to restart Eclipse and my device becomes visible again.
Some friends of mine also shared that some other mobile device usb drivers were conflicting with the samsung drivers (it was ZTE if I am not wrong). They uninstalled the ZTE drivers and then got the Samsuung running ok too. Try consider uninstalling all other usb drivers before you try the Galaxy S2.

Have you installed exactly the right SDK version for the phone you're using?

Given that you can access the phone on the PC via KIES, I assume that you have all the correct USB drivers installed.
Ensure that debugging is enabled on your phone. This can be done from the Settings preferences.
Install the Android SDK. Add %ANDROID SDK_INSTALL_PATH%/platform-tools to your path.
If everything is working up to this point, plug in your phone and execute the following from the command line.
adb devices
and you should see your device listed.
Install the Android Developer Tools plugin in Eclipse.
Create/Import your project.
Right click your project and from the context menu, select Debug As --> Android Application

I have had exactly the same problem as you, I even gave up on developing for 2 months because of this. I have just started again and really needed to get this working.
I tried all of the above and pretty much every combination of the above and still failed.
I have just got it working by not doing anything different apart from when I uninstall the old USB driver (add remove progs), the next time I installed AGAIN, I used the SAMSUNG USB Driver for Mobile Phones V1.3.450.0 (an older version than ones suggested on other help forums, I just got it by accident somewhere and thought I'd try it). The next time I plugged the phone in, it did all the usual finding CDC etc. that it always did when it failed...but then.... it asked for the ADB Driver, WOW! I got excited. I just selected Install Automatically and away it went.
I still already had the PDANet thing running and that popped up saying a connection is available. I've not used it though because it wouldn't install on my phone anyway.
FYI, I have these settings on the phone:
USB debugging ON (obviously)
Allow Mock Locations OFF
Unknown Sources ON
I hope this helps.
Dan.

This may not help at all since you have probably tried it already but I had huge issues on two different windows 7 machines getting my s2 to connect for debugging.
I ended up getting one working by plugging in the s2 USB connection, un-installing the drivers for it in the device manager, unplugging the USB connection, un-installing Kies, downloading the most up to date version of Kies, installing that and plugging it back in.
The other one was even more painful, it was a while ago now but I did the same as the above but removed eclipse and the Android SDK as well, installed the latest version of Kies first, the eclipse, then the sdk and made sure all of that was done before I plugged the phone in.

I faced same issue which you faced..
I solved this by this way.
1) Right click on my computer and select Manage
2) Then select Device manager..
3) connect your phone (galaxy s2 in my case)
4) I found one device with named "unknown" in sub option I foung my phone name i9100
5) Then right click on that and select update driver software
6) you will see then this..
Tadaa....Done :)
Hope this will help you also..

why eclipse can not detect android device?

Eclipse can't detect my android device but it can run with the emulator. i have no problem with the android device setting since it work well in my old laptop.
any idea?

When you start the Device sometimes adb doesn't recognize it because it has already started. So, in that case you just need to reset adb from DDMS->Devices

Go to android-sdk/platform-tools/ via command promt...
write command.. adb devices (It will show the list of attached devices)
If its not display device number then look at the drivers of device on your system. And if display then just restart eclipse..

Check that the android:minSdkVersion is lower or equal to the Version running on the phone. If it is higher it wont show on "Android Device Chooser"

Also, after installing the usb drivers you may need to set your Android device to developer mode and enable USB debugging on your device before it will be seen by adb or eclipse. From http://developer.android.com/tools/device.html
2.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.
Note: On Android 4.2 and newer, Developer options is hidden by default. To make it available, go to Settings > About phone and tap Build number seven times. Return to the previous screen to find Developer options.

In my case, i ran adb-devices and it did show my device and it was unauthorized on the PC I was using.
I went to developer tools and disabled and then enabled USB debugging. It then prompted me for authorization for that computer, and then it worked fine.
Hope this helps someone.

Try connecting using the command prompt ./adb connect 192.168.xxx.xxx:5555

If you are running Linux you will have to add your device to the /etc/udev/rules.d/51-android.rules file.
Have a look here: http://developer.android.com/tools/device.html . Its a document on using hardware devices.

haven't you enable 'debug mode' in your Android device?
If not, then please enable it first. Then follow the steps in this article.
This example use Lenovo P770 as a device.
http://www.mywordismyopinion.com/2014/02/experience-using-smartphone-lenovo-p770.html
-hope this is helpful, :).

just install any driver are any compatibility software provided by your device provider like Samsung provide kies,Htc provide Sync etc..
Either check check your sysytem or antivirus not block it.