update myApp in '/system/app' failed with error code -7

[jack zhang]

I have 'myAPP' in '/system/app' as part of the iso image.

After hard disk is created with iso image, 'myAPP' is installed and shows
up in Home screen.

Now, I have a newer version 'myAPP', 'versioCode' and 'versionName' are
changed in 'build.gradle' before generating the newer version APK.

When I try to install the newer version 'myAPP.apk' from FileManager,
installer says fails. Logcat shows "*D/InstallAppProgress( 2208):
Installation error code: -7*"

Few questions:

1) the APKs were generated from Android Studio Project's
'./build/outputs/apk/debug', so these are debug versions. Does it matter if
it is debug or release? Do they need to be signed ?

2) I think the installer is trying to install it to '/data/app' directory,
is the update failed because there is a same app in '/system/app' ?

[Michael Goffioul]

1) the APK built by Android Studio must be signed with the same key as the
one installed in the firmware; the key used by the app in the firmware
depends on how you have injected it in the build process (typically the
value for LOCAL_CERTIFICATE in the Android.mk that injects your app); but
it's very likely that the update uses a different signature; you might want
to install the app using "adb install -r /path/to/my/update/apk" to get a
more meaningful error code

2) no, this is the way app update works: all app install, whether it's a
new app or an update for an app on the firmware, ends up in /data/app

Post by jack zhang
I have 'myAPP' in '/system/app' as part of the iso image.
After hard disk is created with iso image, 'myAPP' is installed and shows
up in Home screen.
Now, I have a newer version 'myAPP', 'versioCode' and 'versionName' are
changed in 'build.gradle' before generating the newer version APK.
When I try to install the newer version 'myAPP.apk' from FileManager,
Installation error code: -7*"
1) the APKs were generated from Android Studio Project's
'./build/outputs/apk/debug', so these are debug versions. Does it matter if
it is debug or release? Do they need to be signed ?
2) I think the installer is trying to install it to '/data/app' directory,
is the update failed because there is a same app in '/system/app' ?
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