Launch failed: Installation failed. Failure [INSTALL_FAILED_TEST_ONLY

[Panaviotis]

Hi everybody.
Android Studio is much too heavy for my laptop...so...
I 'm trying to build an android app using VSCode with Android extension by adelphes.

I connect my phone to the usb port and with the command line:

In my VSCode I have opened the project and have made the launch.json:

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [   
        {
            "type": "android",
            "request": "attach",
            "name": "Android Attach",
            "appSrcRoot": "${workspaceRoot}/src/main",
            "adbSocket": "localhost:5037",
            "processId": "${command:PickAndroidProcess}"
        },
       
        {
            "type": "android",
            "request": "launch",
            "name": "Android launch",
            "appSrcRoot": "${workspaceRoot}/src/main",
            "apkFile": "${workspaceRoot}/build/outputs/apk/debug/app-debug.apk",
            "adbSocket": "localhost:5037"
        }
    ]
}

I run it and get this message:

Checking build
Searching for devices...
Found 1 device
Deploying current build...
Installing...
Launch failed: Installation failed. Failure [INSTALL_FAILED_TEST_ONLY: installPackageLI]

What can I do to fix it? (I think on my phone I should see some message asking me if I allow to install the app, but no such message appears)

 

[GameTheory]

What can I do to fix it?

Does your AndroidManifest.xml have (android:testOnly="true")? If it does, change it to "false" or remove it.

 

[Panaviotis]

No it has not.

I 've also tried (in file gradle.properties):

android.injected.testOnly=false

...without any result.

 

[James_Watson]

That means the APK can only be installed via adb (which Android Studio uses).

So, try to run in the command line:
adb install -t yourapp.apk

 

[Panaviotis]

That means the APK can only be installed via adb (which Android Studio uses).

So, try to run in the command line:
adb install -t yourapp.apk

No apk is produced.
So it also means that the built failed.
(or, because it 's supposed to get installed directly on the phone, it' s not saved on my pc)

EDIT:
-I built it with the command line: gradlew assembleDebug
-then adb install -t myapp.apk

...and worked!
Thank you all!

 

[James_Watson]

No apk is produced.
So it also means that the built failed.
(or, because it 's supposed to get installed directly on the phone, it' s not saved on my pc)

EDIT:
-I built it with the command line: gradlew assembleDebug
-then adb install -t myapp.apk

...and worked!
Thank you all!

In general, either Android Studio or VS Code will build and generate a debug version apk file on your PC. You may locate that apk file on your PC before running the command line: adb install.
Anyway, the problem is solved.