Develop Reference

Not detecting my android device despite my laptop did

I have been using android studio for the past 5 months and everything was fine. Suddenly, yesterday when i tried to debug my app android studio gave me the error of 'adb.exe start-server' failed -- run manually if necessary.
In an attempt to solve this, I
Killed adb.exe via task manager, restarted android studio and got the error
Opened command window,navigated to platform tools, adb kill-server and adb start-server, restarted android studio and still got error
Then,
I downloaded the latest platform-tools of version 28 something from the documentation.
Updated SDK tools from SDK managet to version 28.0.3
Updated Android emulator to a version of 28
Tried to debug my app, got no 'adb.exe start-server failed' error but my device is not being detected by the android adb despite it is detected by my laptop
Then i started again the command window, restarted the adb server, then i checked the connected devices on the adb by typing 'adb devices' but no devices was shown in the list.( maybe the problem is something here)
I toggled among the usb options on my phone, still my device is not detected on android.
Can somebody help me on this please?
Note: My android device is on debugging mode and this is the same device i have been using since 5 months on android studio.

Install and configure your Android device:
Install the USB driver for your Android device.
Enable USB debugging on your Android device.
If necessary, install the Android development tools (JDK/SDK/NDK).
These libraries are installed by default by the RAD Studio installer.
Add your Android SDK to the RAD Studio SDK Manager.
Connect your Android device to your development system using the USB
cable provided with your device.
At the AutoPlay prompt, select Open device to view files.
In the Control Panel, search for and select "update device drivers".
In the system Device Manager:
Your Android device should be listed under Portable Devices. Locate
and right-click your Android device, and select Update Software
Driver.
Browse to the \extras folder in your installed directory, and
select the folder that matches your Android device. Then click OK.
For example, select google for the Nexus 7 or Nexus 10 tablet.
If you do not find a folder for your Android device, see Installing the USB Driver for Your Android Device.
Verify that your Android device is now:
Listed in Windows Explorer, below the system disk drives, along with your mapped network drives.
Displayed in the Target node in the Project Manager.

Can't see my device of chrome://inspect/#devices

I've followed the instructions at google: https://developer.chrome.com/devtools/docs/remote-debugging. I've also went over the troubleshooting section - but nothing seems to work.
I have samsung galaxy 3 (android 4.1.2, chrome 42.0.2311.111). USB debugging enabled. I've tried restarting the device after ticking the USB debugging a few times.
On windows 8 I run chrome (44.0.2388.0 canary). I've installed Samsung USB Driver, and my computer can see my device.
I do not get any notification when plugging the device nor when opening canary with the inspect page.
Did I miss anything?

Try these steps:
Download and install Android SDK
Open SDK Manager.exe
Select Android SDK Platform-tools and press Install packages...
Open a command prompt and execute these commands:
cd C:\Program Files(x86)\Android\android-sdk\platform-tools (or C:\Users\User\AppData\Local\Android\Sdk\platform-tools)
adb.exe devices
You should receive a response like this:
List of devices attached
ABCDEFG123 device
If your device is listed check if Chrome detect the device, otherwise try to execute this command:
adb.exe kill-server
adb.exe start-server
adb.exe devices
Check again if Chrome detect the device.
If your device is not listed at all after executing adb devices command there is something wrong in your configuration (e.g. incorrect or missing drivers?)

Hope this helps somebody else...
This happened to me because I was trying to Chrome inspect a release build (Ionic; i.e. ionic build android --release). If I build a debug app (ionic build android), I am able to see the app from the chrome inspection tool without any issues.
Google play does not like debugable apps https://developer.android.com/studio/publish/index.html
which is needed for the inspection - see this SO link: debugging an ionic app for android platform hence proper releases won't appear in the Chrome inspection.

In my case the problem was solved changing the usb connection mode in the settings of the Android device to "Camera (PTP)" . For some reason the usb debbuging did not work when connection mode was set to MTP.

This looks like a bug in Chrome or in Android. This helped me: on your android device select USB connection settings (popup which is open on cable connect). It has MTP/PTP/charge modes. Switch between MTP/PTP and back.

Download and install Android SDK
Open SDK Manager.exe
Select Android SDK Platform-tools and press Install packages...
MTP -> PTP

adb "waiting for device" after installing usb drivers

I am new to Android development and I am trying to get a test app onto my phone. My phone is an LG G3, and I am developing on Windows 8. Following the official tutorial,I have installed the android sdk, and can run ant debug. However, when I run adb install bin/MyFirstApp-debug.apk it just says
error: device not found
error: device not found
error: device not found
- waiting for device -
I went to the OEM USB Drivers page, got the usb driver for my model, installed it through the installer provided by LG, and restarted my computer. Still getting the message.
When I try to update the drivers through the Windows 8 Device Manager, it says the drivers are up to date. I have also tried different combinations of turning both developer mode and usb debuggin on and off.
I have also tried setting up my Macbook as a development environment, but I still get the same error at this step, despite the documentation saying "If you're developing on Mac OS X, it just works. Skip this step." in reference to installing USB drivers.

Does your device show up in Windows Explorer? If not, this works in Windows 7. Try:
Start -> Computer (right click) -> Manage ->Device Manager -> Android Device -> Android Composite ADB Interface (Right click) -> Update Device Driver -> Browse My Computer for Driver Software -> Let me pick from list of device drivers on my computer

Found the answer in the second response here. Needed to specifically set the USB connection to Internet

My phone cannot be detected in eclipse to test run

Before asking my question, I have looked through a few threads that share the same problem as me and have tried all the given solution with no success. I am from Malaysia.
I cannot get my device to be detected to test my app on my phone. I have checked both the "Unknown sources" and "USB debugging" settings in my phone. I am using eclipse. But if I create a random virtual device, my app is able to run there.
Okay so I am using a Motorola Atrix 2. And I'm using Windows 8 Pro 64 bit
I have downloaded android SDK bundle from here : http://www.motorola.com/sites/motodev/us-en/motodev_lp.html
I have also tried downloading the latest driver with no success. I have also added this line in the manifest android:debuggable="true"
I have tried both as a mass storage device and a media transferring device.
I would appreciate any help a lot because as of now, I cannot progress further into developing an android app and that saddens me. :(
I have attached a picture of which my android phone should be detected in the window, but as you can see, none.
https://pbs.twimg.com/media/BJu1XSgCYAEGCUd.jpg:large

go to /your-android-sdk-directory/platform-tools using command prompt.
type
adb kill-server
adb start-server
adb devices
n see whether ur device is detected now or not...
Note: if you're using a Linux machine then put ./ before adb

Install proper drivers for your adb devices, from Android-SDK archive or Motorola site.
If you are on Windows machine, go to the device manager find your device, and select folder with drivers for it.

Open you windows os's explorer, have a look at the process, if there two or more process hold your adb, try to exits the process

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"
Install and run programs/drivers with admin rights.

Have you installed Motorola Device Manager?
When debugging Samsung and HTC devices I got it to work by installing that kind of software (for syncing the devices to the computer).

Download from the following: ABD Universal Driver
and install it. Make sure you have your device plugged in before installing and make sure you are on USB debug mode on the phone settings.

How to connect the device to Eclipse?

I am not able to resolve this simple issue.
I am trying to connect my device to Eclipse via USB cable.
On my PC, I have installed Eclipse and the Android SDK and running the program on the emulator is working fine.
I have downloaded and installed Samsung Kies on my PC. It shows my device if connected via USB to the PC.
But I dont know how to connect the device with the emulator.
Connect means, I want to run the Eclipse code on my device instead of emulator. I am using Samsung Galaxy Ace GT-S5830i. Please help me out to resolve this issue.

Comment is lack of formatting so i add an answer.
Check if your computer had your phone driver. I assume that your use Windows. Open Device Manager
At a command prompt, in the Start Search box, or in the Run box, type the following command: mmc devmgmt.msc
. Other ways : check link
If you find your phone name or ADB Interface so you got driver. Try to restart DDMS or restart your Eclipse.
If you don't find your device or see something Other device with yellow question mark so try to install driver by browsing on your phone to Settings - Developer Options - Enable developer option - Enable USB debugging - Plug your phone to computer. Windows will ask you to install driver.
3, Update Google USB driver in Android SDK Manager (in Eclipse) or search Samsung Galaxy Ace GT-S5830i driver
4.Some weird case i got on some device.
Nexus S: disable Developer option. Restart phone. Enable again. Windows ask to install driver or you will see it in Eclipse.
HTC phone or Samsung : change Connectivity Option on phone to Charge only (Swipe status bar. Check notifications displayed). Some phone set it to some kind of Sync data so Windows can not recognize device.

I think your emulator is in Automatic. You can change that to Manual.
Try this,
Step 1
Go to Run Configuration
You can see three Columns Android,Target and Common.
Step2
Select the Target
Step 3
Choose Always prompt to pick device.Click Ok
Step 4
Now run your project you should see the emulator and your device. Select your device and click ok.
Hope it helps.

Source.
Troubleshooting
This all sounds very straightforward, but there are countless quirks and hard-to-diagnose problems that can make connecting a device much more difficult than it sounds. In this section, we'll run through a checklist of things to try when your device isn't registering.
Check that USB Debugging is enabled. This setting can inadvertently (and perhaps even automatically) change when you plug/unplug your device from your machine, or when you reboot your phone.
Check your device while it's connected to your machine. Is it asking you to choose between different modes? Some phones have a 'charge only' mode that can prevent Eclipse from recognizing the device.
Choose a connection type
Make sure you don't have an Android Virtual Device running in the background.
Could there be a problem with the USB cable? If you have a spare cable to hand, plug it in to rule out a fault with the cable itself.
Double-check you're running the correct driver. Even if you are, some devices have all the required software pre-installed (for example, HTC Sync) and downloading drivers from another location can muddy the waters. If this might be the case with your device, try uninstalling the driver from your machine and reinstalling the software from your device's memory.
Does the driver require supporting software? Samsung Kies on Windows requires .Net Framework 3.5 SP1 or above, for example. This is usually installed along with the driver, but there's no guarantee.
Running the Android Debug Monitor tool (monitor.bat) has been known to kickstart Eclipse into recognizing a new device. Connect your device, locate monitor.bat (android-sdks/tools/monitor.bat) and double-click to open. This will open the Android Debug Monitor, a stand-alone debugging tool that lists connected devices.
Android Debug Monitor
A running adb.exe process can interfere with the connection. Close Eclipse, and open the Task Manager by pressing CTRL, Shift and Esc. Find the adb.exe process and kill it. Launch Eclipse and try again.
Check that your 'Project Build Target' is compatible with the Android version on your device. You can check what version of Android your device is running by opening 'Settings' and selecting 'About Phone,' followed by the 'Software information' option if available. If you need a reminder of your project's build target, ensure the project is selected in Eclipse's 'Package Explorer,' open the 'Project' menu and select 'Properties.' If the 'Android' tab isn't selected by default, open it and the Build Target will be displayed.

Have you enabled USB debugging in your device?? You can find it in your device
Settings -> Developer Options -> USB Debugging.

The android app you have created will be a .apk file, generated by eclipse, during a successful Run. Find the .apk file from the eclipse project explorer or by tracing your workspace. Copy the .apk file to your memory card (via USB or a card reader) and install it.
You should also enable the "Unknown Sources" option under "Security" of your Android device.

If you have required options enabled on your phone (USB Debugging and Unknown Sources) you can try do this. On your computer open command console. Using cd navigate to your android sdk installation folder. Go to platform-tools. You should have there adb file. Run this
./adb kill-server
and then
./adb start-server
Then check plugged devices
./adb devices

First, you are not connecting device with emulator. What you want is eclipse to identify your device and use it for development.
Everything about using devices for android development is given in official documentation.

You have to put the phone in 'debug' mode - I don't have the instructions handy (but you can search here or on the android site for the info you need).
Also check for THIS.

Try right clicking the project -->Run As --> Run Configurations then select target and choose always prompt
On your device turn on debug mode
Now try running project

I am assuming you don't mean connecting the device with the emulator but connecting the device to your computer so you can debug it and run applications directly from Eclipse to the device. In which case KIES by Samsung will not help you at all. What you need is the Android USB Drivers provided in the Extras tab in SDK. Sometimes the installation will bug up because you didn't run SDK manager as an administrator so make sure you do that. When all of this is done make sure your device is unconnected to your computer and then reconnect it after the drivers are installed. You should be prompted with a new device installation wizard which you must accept. Additionally, you should have debugging enabled on your device, and as an extra step you can setup launching as a manual configuration but it is not needed.
To enable device debugging
Settings -> Developer Options -> USB Debugging.
For more information visit here
BTW : If the Google USB Drivers don't work you might need to install the specific Samsung drivers which are located here

Goto -> Setting -> Application -> Development -> USB Debugging
Enable it and try.

I know this is a little old, but I was having the same issue. I tried all the options of setting usb debugging (off), disconnecting, restarting phone, usb debugging (on), connecting the phone and it just wouldn't connect.
I ended up installing the latest version of Kies on my machine and added the Unified option at the end of the installer and I then the phone would connect. (Not sure i needed the unified option) but it worked for me.

I tried all the above but it didn't helped me. I did couple of things additionally
Since my mobile device is Android, I unchecked Unified option from Kies installer. This is the crucial thing that helped me solve my problem
I restarted my mobile phone.