Develop Reference

Not able to debug app on android device - Android Studio 2.0

I am not able to debug an app on my device (Asus Zenphone 2) after I updated android studio to 2.0. I keep seeing below message in debug tab right after I click on debug icon in Android studio.
Message in debug tab in Android Studio UI
---------------------------------------------------------------
Waiting for application to come online: packagename
Waiting for application to come online: packagename
Waiting for application to come online: packagename
Waiting for application to come online: packagename
I keep seeing Alert Dialog with the title "Waiting for Debugger" and Force close button all the time.
I searched but it seems only two results from google for that message.
I restarted Android studio, checked developer settings on phone...
Have anyone faced with this issue. Please help me. I cannot run the emulator, because my mac will be too lag. Thank you in advance.

The problem is that after installing and starting to launch the app, that debugger client that AndroidStudio starts is unable to connect to the debugger server on the device. This can have many causes, see this answer and the other answer shown on this page and see if one solves the problem for you
To help figure out the problem, look at the 'Console' tab of the 'Debugger' window in AS. One of the first few lines should look like this:
$ adb shell am start -n "com.acme.audtest/com.acme.AudTest" -a
android.intent.action.MAIN -c android.intent.category.LAUNCHER -D
Cut and paste that line into a command prompt, REMOVE THE '-D', and execute it.
It your app ('AudTest') comes up without error, the problem is in AS, is communication to the device, or the configuration of the device. If the app doesn't start, it is in the .apk. (Not the complete solution, but starts to point you in the right direction -- for which of the solutions below applies to your situation.)
First I select the second option, and it worked fine. But then don't know why I change to select first option. So, the debugger shows the message Waiting for application to come online forever. And I did not notice that, just thought another app prevent me debug or that was an issue with Android Studio 2.0.
So, just check to second option will solve my issue. Thank all.

Restarting Android Studios (2.1.1) resolved this for me.

There are two possibilities:
1.USB Debugging off :
Start Developer Option of your devices
Switch On USB Debugging
2.In Android-Studio : File -> Invalidate Caches / Restart
anyone can be useful for you.Try it

The correct answer is close your Android Device Manager.
None of these suggestions worked for me till I closed it.

For me the problem was in "Android Studio" + "Intellij IDEA" running side-by-side. Was fixed by disabling bundled "Android plugin" in "Intellij IDEA".
(Note: problem appeared only with some later versions of these IDEs)

Nothing worked for me except one solution...
Clearing the Intellij IDEA (Android Studio) .idea directory which contains configuration information worked for me:
Exit Android Studio
Navigate to the project you are trying to debug
Backup any files inside .idea that you modified (if your project checks any of these into VCS)
Delete .idea directory
Open the project in Android Studio

I had to remove the parameter
android:exported = "false"
from the main activity.

if you get this problem on the emulator, running adb reconnect worked for me. there is a similar command for devices adb reconnect device

**
This answer might help for those Who have successfully connected their
device along netbeans NB Android but on debug there's no application
being appear on device.
**
Ok so solution is check your android device version in mobile setting click on about device at last: you will know your android version there.
Now choose the same version for your netbeans android project.
Right click on project name click on properties and then change target with same as your android device.
(In my case android version was 4.4.2 so I selected the same for my project target)
Before to go ahead click on service tab next to project tab in netbeans then right click on Android device and click on restart ADB.
Finally you need to right click on project again and click on clear and build.
Now you can run with hope to get result.

I just wanted to share my experience as I had the same error and there was no way to solve it using all the solutions you guys posted. I even deleted several times my virtual device, no way to make it work again.
In my App I have a custom permission com.example.CUSTOM_PERMISSION and I wanted to use it to protect my Main Activty from a confused deputy attack.
<permission android:name="com.example.CUSTOM_PERMISSION"
android:label="#string/permlab_deadlyActivity"
android:description="#string/permdesc_deadlyActivity"
android:permissionGroup="android.permission-group.COST_MONEY"
android:protectionLevel="dangerous" />
.
.
.
<activity
android:permission="com.example.CUSTOM_PERMISSION"
android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
Somehow that property android:permission was preventing my app to install and run on the virtual device, even though it could be compiled and build with Gradle successfully.
Just after removing it, everything is fine again
I am not sure the app is protected this way, I'm building another test app to try performing a confuse deputy and see if the declaration of the custom is just enough.
Hope this can help somebody that was getting mad like me!

I had this problem in the Android emulator, and it was solved by going to Tools->AVD Manager, selecting the device, right click "Cold Boot Now".

The solution which helped me is to click on attach the debugger to android Process and set debugger to java.

Just throwing my experience in as this just started happening. With regards to all these answers, I tried a few of them and none seemed to work. So I started from scratch:
Initial setup:
- USB Debugging ENABLED
- Always prompt when connecting to USB (I usually only connect in charge mode)
- Allow ADB debugging in charge only mode ENABLED
- Wait for debugger DISABLED
- Verify apps over USB ENABLED
The steps I took to get debugging back:
Close down Android Studio - I didn't go so far as to delete the .idea folder as discussed, but I'm sure it couldn't hurt.
DISABLE USB Debugging
Revoke USB debugging authorizations
Reconnect Device
$ adb devices
> <Device Id> unauthorized
ENABLED USB Debugging
Reconnect Device
When prompted select ALLOW (I clicked always allow)
$ adb devices
> <Device Id> device
Open Android Studio and hit debug - Application started successfully, I was still getting 5-6 of these messages but then it worked:
$ adb shell am start -n "com.exampleapp/com.exampleapp.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER -D
Waiting for application to come online: com.exampleapp.test | com.exampleapp
Waiting for application to come online: com.exampleapp.test | com.exampleapp
Waiting for application to come online: com.exampleapp.test | com.exampleapp
Connecting to com.exampleapp
Connected to the target VM, address: 'localhost:8600', transport: 'socket'
React Native
As a side note - this happens every so often, I'm not sure whether it's from switching back and forth between running from react-native run-android or debugging in Android Studio, but regardless I've had to do this a couple times (finally decided to document).
Also remember
$ adb reverse tcp:8081 tcp:8081
and to start the packager when debugging (I tend to forget).

Try to restart ADB. Execute terminal commands:
adb kill-server
adb start-server

I had this problem and none of the solutions provided worked for me.
I you had the same issue, you can also try this:
Edit Run/Debug configurations
Select the 'app' or other name's configuration
At the launch Options, change Launch "Nothing" to "Default Activity".
Steps

Android Studio does not install latest application on device

I'm following some tutorials about building apps in Android Studio, but for some reason it's not launching/installing the latest version of my app when I click 'run'. I have to manually uninstall the app on the phone and then click run after making changes in Android Studio for the app to get updated. Any ideas?
Here is the console output:
Waiting for device.
Target device: htc-htc_one_m8
Uploading file
local path: /home/brandon/AndroidStudioProjects/JustJava/app/build/outputs/apk/app-debug.apk
remote path: /data/local/tmp/com.example.android.justjava
No apk changes detected. Skipping file upload, force stopping package instead.
DEVICE SHELL COMMAND: am force-stop com.example.android.justjava
Launching application: com.example.android.justjava/com.example.android.justjava.MainActivity.
DEVICE SHELL COMMAND: am start -D -n "com.example.android.justjava/com.example.android.justjava.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.android.justjava/.MainActivity }
Waiting for process: com.example.android.justjava
Connected to the target VM, address: 'localhost:8638', transport: 'socket'
Disconnected from the target VM, address: 'localhost:8638', transport: 'socket'

No apk changes detected. Skipping file upload, force stopping package instead.
Android Studio thinks that there are no changes and doesn't install the new APK. A workaround is to disable the "Skip installation if APK has not changed" option in Run > Edit Configurations.
I'm using Android Studio 1.4
Source: https://code.google.com/p/android/issues/detail?id=160901

Android Studio thinks that there are no changes and doesn't install the new APK. A workaround is to disable the "Skip installation if APK has not changed" option in Run > Edit Configurations >Android Application > app >Miscellaneous .
Then uncheck "Skip installation if APK has not changed".
Another problem like this is instant Run you can manage it by :- Just go to "File -> Settings -> Build, Execution, Deployement -> Instant Run" and just disable it. With this Android Studio builds from scratch each time but it's better than not building it right.

This is actually a bug
you can find more info Android Open Source Project - Issue Tracker
Disabling instant run option in edit configuration and adding -r flag to the install flags is best work around for now.!

option in Run > Edit Configurations >Android Application > app >Miscellaneous . Then uncheck "Skip installation if APK has not changed".
THEN --> option in Build > clean project and rebuild project
and reinstall APK in your device.
THIS WORKS FINE FOR ME, HOPE THIS HELP OTHER ALSO

Another reason why the app might fail to install/start is if you've set up a "work profile".
The app might still be installed in your "work" profile and thus won't be re-installed nor uninstalled when starting through Android Studio. The "main"-profile portion of the app is "disabled" though and thus the activity can't be started.
Solution: manually uninstall the work-app, then redeploy from Android Studio.

Sometimes when I get this I just kill the app on the device, then run it. Throw in a log statement to clarify you're on the right build, just something that you know you changed for this build.

I have tried all of above solution but didn't work for me.
I solved by Opening a new project or some other existing project (being in current project) in a new window and then I closed the previous one..
I opened again the previous one and clicked on run and it worked for me like a charm..:)

Run on a Phone
Set up your device as follows:
Connect your device to your development machine with a USB cable. If you're developing on Windows, you might need to install the appropriate USB driver for your device. For help installing drivers, see the OEM USB Drivers document.
Enable USB debugging on your device by going to 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.
Run the app from Android Studio as follows:
In Android Studio, click the app module in the Project window and then select Run > Run (or click Run in the toolbar).
In the Select Deployment Target window, select your device, and click OK.
Please refer the link

I/O Error Connection refused android studio

WhenI run a project in android studio, I get this error - I/O Error: Connection refused
The emulator starts fine but doesn't pull in/reflect my project
Device connected: emulator-5554
Device is online: emulator-5554
Target device: Nexus4 [emulator-5554]
Uploading file
local path: /Users/martinsjolte/AndroidStudioProjects/FirstAPP1/Firstapp1/build/apk/Firstapp1-debug-unaligned.apk
remote path: /data/local/tmp/dk.first.Firstapp1
Installing dk.first.Firstapp1
DEVICE SHELL COMMAND: pm install -r "/data/local/tmp/dk.first.Firstapp1"
Device disconnected: emulator-5554
Launching application: dk.first.Firstapp1/dk.first.Firstapp1.MainActivity.
DEVICE SHELL COMMAND: am start -n "dk.first.Firstapp1/dk.first.Firstapp1.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
I/O Error: Connection refused
My platform is a mac osx ver.12.9.1

Ok, I don't know if i got "the" answer. but here is how I've solved the same issue on my environnement ( Windows 8/Android Studio, but same error with ADT or eclipse) :
Context of my issues :
I've got an Asus PC, and with all the application suite installed by default.
So I've found that one of this Asus app ( currently "Asus sync") was using adb and in fact, it was taking control of the emulator over my adb in the AndroidSDK directory.
How to fix as a PC user :
Go to Task manager ( right click on task bar) , and look for "adb.exe" . Then right click on it and select "Open the directory". This will bring you to the responding adb. In my case it was Asus Sync, so I just had to unistall this software and everything works fine !
How to fix as a Mac user :
Go to Activity Monitor (/Applications/Utilities/), and look for "adb". Then try to kill the process. Then look if it solve your "Connection refused" in Android studio/ADT or eclipse
If still not working you can try :
Start a emulator ( with your AVD manager)
when finished loading, Open DDMS panel (in android studio : Menu Tools > Android > Monitors DDMS)
Look if you see your current running android emulator ( listed on the Device panel)
See if this line is kind of "flashing" ( connect/disconnect).
If so, you have probably a other adb instance running in conflict
If not, you can restart adb or reinstall your SDK
Hope this could help someone !

This issue occurs when Android Debug Bridge aka ADB is not responding to the request from Android Studio. I killed the process adb.exe and started it again. This solved my problem.

If you are using a real device :
Just reconnect your device, make sure your cable are workable and you installed the proper drivers.

I had the same problem, and my problem fixed by restarting the android-studio. Hope, that will help you too.

For me the following worked(after I tried the above points mentioned by others):
I tried debugging/running anther application. It was okay. So this pointed me to the direction that the current application has some problem
if (point 1 == true) {I uninstalled the application from my phone manually }
Then re-make/rebuild the application and debug/run worked

could not access the package manager. is the system running while installing android application

While installing the android application in the emulator I am getting the following error.
Please help me to resolve this error.
Error message:
emulator.exe -avd avd_name
adb wait-for-device
adb install path-to.apk
could not access the package manager. is the system running while installing android application....

You need to wait for the emulator to full start - takes a few minutes. Once it is fully started (UI on the emulator will change), it should work.
You will need to restart the app after the emulator is running and choose the running emulator when prompted.

As other have said, this error occurs because the emulator is still in the process of launching. An attempt to access the package manager, for the device, at this time causes an error.
It's just a simple timing issue. Here are the steps to avoid this error:
Wait until the emulator 'lock screen' is showing.
Run the 'app' again (^R in most IDE's).
Choose the running device (Should be the same emulator).
App should install without error.

In my case it was just that the emulator took 9 minutes to start. Wait until you see the lock icon on the emulator LCD. Or use actual tablet or phone.

Facing Same issues following Link helped solving the problem. The above solutions were not helpful for me.
deployment-failed-could-not-access-the-package-manager-is-the-system-running
By restarting server using CMD application was back to work. Open cmd (Run as administrator), open this
cd C:\Program Files (x86)\Android\android-sdk\platform-tools
(this path must specify your android-sdk installation folder )
Now, first write,
adb kill-server and then adb start-server.

Kill the process/server and restart it.! It worked.

You can avoid the error by setting default device before launching application. Launch the AVD before starting the app.

Once you see this error, wait for emulator to show lock screen. And then relaunch the app in your IDE and check the emulator again. It works for me always.
In Android studio, you can relaunch by clicking the green play button or ctrl + r.

If this error is gotten when using a rooted device's su prompt and not from emulator, disable SELinux first
setenforce 0
You may need to switch to shell user first for some pm operations
su shell
then re-run your pm command.
Same applies to am commands unavailable from su prompt.

The solution for me was to restart the IDE. I suspect that a slow emulator was hiding from view, blocking installation on my device.

Check your project build is in Debug mode not Release, I had some problem for debugging always I forget to change Release mode to Debug (Xamarin Users)

How to debug signed Android app from Eclipse?

Android 2.2.
I need to debug my signed APK on my Nexus S. How can this be done using Eclipse?
I start the app on my phone and then...?

Set the debuggable=true in the manifest, export, install and sign the the app. Connect the device via USB, enable USB debugging. Then open the DDMS perspective, select the device and attach to your app's process (you will see the package name listed). If you have a rooted device, you can connect to any process if adb is running as root.

When device connect to your eclipse running mechine , set debuggable=true in manifest file and enable debug mode in android phone it can view current running log using logcat, otherwise
You can debug your running application using adb tools from the command line
adb logcat - View device log
will display the current logcat (debug messages)
adb logcat [ <filter-spec> ]
using you can filter only your given debug messages
for configure debug tool view
http://developer.android.com/guide/developing/tools/adb.html

In Android Studio stable, you have to add the following 2 lines to application in the AndroidManifest file:
android:debuggable="true"
tools:ignore="HardcodedDebugMode"
The first one will enable debugging of signed APK, and the second one will prevent compile-time error.
After this, you can attach to the process via "Attach debugger to Android process" button.

You have two ways ..
You can use Log.v or log.d or Log.i (Logging) in your code and get all those logs in logcat view in eclipse while your application runs on your device.
You can run (while debugging , pressing that insect icon on eclipse ) the application from eclipse on device, By putting breakpoints in your code you can debug your application.