Develop Reference

Manually installing an updated APK fails with "signatures do not match the previously installed version"

I've built a silly app to share among a few friends. No need to put it up on the app-store.
I built the first apk (signed), uploaded it to a web-server and all worked well.
A small issue arose, I fixed it, re-built, signed with the same keystore and uploaded it again. It now seems that I am unable to install from the new apk. The debugger tells me:
signatures do not match the previously installed version
So I uninstalled the old version by opening the app drawer and dragging it onto the "uninstall" button. When opening "Settings -> Apps", I don't see it anywhere anymore. I don't see any traces of the app on my device.
Yet I still get the above error message.
Is it possible some information still lingers on the device somewhere? Is there any way I can verify that?

Yes It is possible if somehow your old application is not removed 100% or its data is not removed.
Try:
adb uninstall "com.yourapp.yourapp"
If you don't know exactly what to put as replacement for "com.yourapp.yourapp", then you just open Android studio, Run your app while it is connected to a device and then look at Debug window.
It says:
Waiting for device.
Target device: samsung-sm_t531-xxxxxxxxx
Uploading file
local path: C:\Users\myapp\app\build\outputs\apk\myapp.apk
remote path: /data/local/tmp/com.myapp.myapp
Installing com.myapp.myapp
DEVICE SHELL COMMAND: pm install -r "/data/local/tmp/com.myapp.myapp"
pkg: /data/local/tmp/com.myapp.myapp
Success
com.myapp.myapp in this case is the name of the package you must use to uninstall.

I had the same issue and the adb uninstall solution did not work for me.
What worked was
On your device go to to Settings->Apps
Select your app, and in the menu select "Uninstall for all users"
Even if I had previously uninstalled the app it was still in the list there.

To me, if the app is meant to be distributed, the adb solution is a no-go: you can't ask one's friend to have the android sdk installed on their machine !
The way to go here is to edit the AndroidManifest.xml and to increment the android:versionCodeattribute in the <manifest>tag (which is the root element).
This would update your installed application

If you are seeing this while conducting connected tests, make sure to include .test when uninstalling via adb because uninstalling via app -> settings does not get rid of the test package
adb uninstall your.broken.package.test
if you just uninstall via
adb uninstall your.broken.package
your test package will still be there. This was only something i noticed while using the gradle command line, haven't come across this problem within android studio

Uninstall the old app from your phone or emulator and try to run again.

I got that error while trying to install release while signing it's certificate.
fixed with the :app Gradle task uninstallRelease and then installRelease again

If you are going in install the same app with a different signature, you may want to uninstall but keep the app's data.
adb -d shell pm uninstall -k <packageName>
adb -d install -r -t -d app.apk

For Unity users who come to this question, the best answer is indeed the one above by #Ehsan
adb uninstall "com.yourapp.yourapp"
I had already installed a previous version on my Android device then selected Development Build in Unity > Build Settings which caused the APK to use a different signature. If you install through the Android GUI it doesn't actually remove everything so you have to use ADB.

I had face same problem With POCO Mobile and Moto G30 Mobile while developing application in flutter
My Solution is:
I have open android project which automatically create in your project, in android studio and run project in connected device. It will automatically ask to uninstall old app with same package name and different signature. After click ok button it will install app.

Android Studio pm install aborted

Im trying to run an application on my GS5 from android studio and Im getting this:
Waiting for device.
Target device: samsung-sm_g900v-f3af9744
Uploading file
local path: D:\Android\Projects\TestProject\build\outputs\apk\TestProject-debug.apk
remote path: /data/local/tmp/com.brian.testproject
Installing com.datascan.mobilescripts
DEVICE SHELL COMMAND: pm install -r "/data/local/tmp/com.brian.testproject"
Aborted
It seems to be copying the file to the device, I can see it in the /data/local/tmp directory. Its just failing at the "pm install" stage.
On the phone I turned on USB Debugging and authorized the computer. Here is what I get when I run ADB devices:
D:\Android\sdk\platform-tools>adb devices
List of devices attached
f3af9744 device
So that seems to be correct. Im not really sure what the problem is. Google search on the problem didnt give me any relevant results.
Does anyone know how to get more information beyond "Aborted"? Any help is appreciated, Thanks!
EDIT:
As suggested by #AlexP. I ran "adb logcat -d -s PackageManager:*", this was the result:
D:\Android\sdk\platform-tools>adb logcat -d -s PackageManager:*
--------- beginning of main
--------- beginning of system
Not much help, but I did decide to watch the logcat as the pm install was being run and I found this error entry:
Tag=appproc | Text= ERROR: Could not find class 'com.android.commands.pm.Pm'
Tag=art | Text= art.runtime/thread.cc:1105] No pending exeption expected: java.lang.ClassNotFoundException: Didn't find class "com.android.commands.pm.Pm" on path: DexPathList[[zip file "/system/framework/pm.jar"],nativeLibraryDirectories=]/vendor/lib, /system/lib]]
Followed by a whole slew of art error entries.
So it seems as though my phone is missing something, maybe?

The reason that Android Studio fails on Galaxy S5 is because the adbd (ADB service on the phone not your PC), on rooted version of this phone does not run as root, which is a security measure. You can verify this by manually trying to execute the Android Studio apk and execute commands on the device and finding out that they are failing to execute, but retrying them using "su ..." and see that the app installs and starts on the device. There are three options to resolve this and unblock Android Studio:
Options:
Flash a ROM that includes the modification - not desired as from my understanding you would like to stay on the stock image; also a good security measure not to have adbd running as root all the time. Older roms fall in this category as well, but then you are missing Stock Rom updates and security patches.
Create a custom boot.img and flash it to your phone - this is basically a custom kernel and not desired for a similar reasons than above option 1.
Restart adbd on your device with root privileges when doing app development - preferred and achievable fairly easy thru various methods including:
Preferred Solution:
a. Restart adbd with root privileges (insecure mode) by killing the service on the phone and using a terminal app or so to restart it using "su". After you are done with your app development, restart your phone and adbd will be back in secure mode, restoring the security measures.
b. Use Chainfire's ADB insecure app, which is free on XDA (download/link below) or pay for it on Google Play to support his work. You can toggle the mode in the app. In the app, you also have an option to auto re-enable the insecure mode on reboots.
References:
https://android.stackexchange.com/questions/5884/is-there-a-way-for-me-to-run-adb-shell-as-root-without-typing-in-su
http://forum.xda-developers.com/showthread.php?t=1687590 (includes free download link)
https://play.google.com/store/apps/details?id=eu.chainfire.adbd (for supporting Chainfire's work)

Possible Solutions :
1. Check if your app had left any datas :
First if the app is already installed, then clean cache data and uninstall it
Under "System Settings" then "Application Manager"
http://i.stack.imgur.com/b3oys.jpg
Then
Force uninstall by running & adb shell pm uninstall com.brian.testproject
Check "/data/data/com.brian.testproject/" and delete it
Remove any entries of your package on /data/system/packages.xml
Remove any entries of your package on /data/system/packages.list
Also you could install SDMaiD and clean your device, especially with "CorpseFinder" and "AppCleaner"
2. Try to install the app manually and debug the result :
In your case you have an issue with pm over android studio... install it manually to have a more detailed message over command line
$ adb push D:\Android\..\TestProject-debug.apk /sdcard/myapp.apk
$ adb shell pm install /sdcard/myapp.apk
3. Check Android Studio and your app sources
Change the targeted api level :
Right click on your app dir + Open Module Settings + app + check sdk version + change target and minimum under "Flavor"
Sync gradle button
Rebuild project
https://www.youtube.com/watch?v=v4b7C6Q-9dI
Update your android studio if you don't have the last release
If your app use libraries, you have to recompile them.
4. Check System Settings :
Check BOOTCLASSPATH of your init.rc. BOOTCLASSPATH must include /system/framework/ext.jar and /system/framework/framework.jar and so on.
Check DEXPREOPT_BOOT_JARS of build/core/dex_preopt.mk. DEXPREOPT_BOOT_JARS must include ext and framework and so on.
The order of all items on BOOTCLASSPATH must be equal to the order of all items on DEXPREOPT_BOOT_JARS.
5. Try pm command directly on the device :
if pm command does not work try that command with a terminal directly on the phone to see if it's a connection issue between pc and phone
pm install /sdcard/myapp.apk
6. Reinstall your rom once again (just reinstall it) no need to erase.

For anyone having this same issue, unfortunately the only solution that I could find was to downgrade my ROM version (to OA8). Once I did that, adb works perfectly. If anyone finds a better solution I'd be definitely like to know.

Android Studio
step 1: Go to file--> invalidate and restart.
step 2: Clean and rebuild project.
step 3: go to project folder run
gradle clean
step 4: restart phone/Emulator.
Done !!!

App does not install on android device by an unknown failure

I try installing my app for the first time on a Nexus 5.
The android studio then tells me I need to uninstall my app inorder to install it (The app never exsited on the phone) and then asks me to unistall the app, I agree and he tries to unistall but an error occurs:
Waiting for device.
Target device: lge-nexus_5-08a9df88021f8ec8
Uploading file
local path: D:\USER\Desktop\Yoav\AndroidProject\Example\app\build\outputs\apk\app-debug.apk
remote path: /data/local/tmp/com.example.user.example
Installing com.example.user.example
DEVICE SHELL COMMAND: pm install -r "/data/local/tmp/com.example.user.example"
pkg: /data/local/tmp/com.example.user.example
Failure [INSTALL_FAILED_DEXOPT]
At this part the studio asks me to uninstall after pressing ok:
DEVICE SHELL COMMAND: pm uninstall com.example.user.example
Unknown failure
I think it's because the app does not exsit on the phone, but if the app does not exsit why does it even want me to delete it?

It might be because of the package name. Check weather is there any app with the same package name that you created before. com.example is not a good practice to use for you practice projects even.
I may be not right but from the information provided this is what I can say.

It happenes because the .apk you built and are trying to install is missing the classes.dex file. This can happen for various reasons but most of the time (for me) the build process gets stuck somehow.
Open Task Manager and kill all following processes:
cmd.exe
conhost.exe
find_java.exe
Then clean and build your project.
Also make sure you use latest Build tools (now 21.1.1).

I had the same problem. I finally had to reboot the device to solve it.

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)

Android adb.exe crashes - Only when called from Eclipse (win7 32)

ADB when run stand-alone works fine. I can connect to my device (HTC Desire) and perform .apk installs etc, so I know the USB drivers are working correctly. A common reason for this question, I know, but that can be ruled out.
Occasionally I can connect to the phone, very occasionally. 99% of the time I just get the standard windows popup "adb.exe has stopped working".
I've updated Eclipse to the latest version.
I'm sure the USB drivers are working correctly
I can connect via adb in command line mode with no issues.
I've searched for a solution until google begged me to stop :)
Seems like a DDMS Eclipse issue.
Any ideas ?
Actually, just before I sent this I had a brainwave.
Without Eclipse running I ran adb.exe from command line and performed an install -r of my .apk package.
All worked fine.
I then started Eclipse - the connection to my phone worked fine...
Nope, Eclipse now failing again. BUT with eclipse trying to connect (and failing) I can simultaneously run adb from command line and install the package. It's got to be Eclipse

If you have an alternate "launcher" or "home-screen" installed, that might be forcing the connection to close. If you have one installed, either force stop it or uninstall it.

I've found that some apps running in your phone can cause ADB to crash for some reason. Try to close unnessecary apps running on your phone when developing in eclipse

In my case, I had an instance of adb.exe from another package (Android-Sync) running. Processes with this file name are common in packages that sync devices. You can find more information about programs that use an adb.exe process here: What is adb.exe ? adb.exe info
To determine if you have an adb.exe process already running, look in your Task Manager on the Processes tab to find the running adb.exe. You can right-click and select Properties from the menu to find out the full path of the adb.exe.
To solve the problem and allow Eclipse access to the correct adb.exe, I shut down Eclipse and the emulator. Then I went into the Task Manager and shut down the running adb.exe. There may be more than one. Then I restarted Eclipse and the emulator. Fortunately, when I started my Android Virtual Device, that program was smart enough to start up the correct adb.exe.

In my case was kinda problem with USB driver. Just plug your phone always to the same USB port.