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What I should to do to create a system app (to obtain rights to use android:sharedUserId="android.uid.system"in manifest file without receiving an error from package manager about certification problem?
I use rooted phone with stock firmware.
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First create a folder for your app ( Let say MyTestApp) inside packages/apps/ of your android AOSP downloaded source code. Then create a Android.mk file inside the folder(MyTestApp). Step 2 open Android.mk file and add folowing code Snippet and save this mk file. PRODUCT_PACKAGES tag at the bottom MyTestApp.
System apps are preinstalled apps such as Clock and Calculator for Android, or FaceTime and iTunes Store for iOS. Many of these apps can't be uninstalled, but you can allow or block access to them.
Ok, I think that I find sollution from great xda developers: http://forum.xda-developers.com/showthread.php?t=1776095 here is full description how to obtain access to apps signed by platform keys. Do you apply with this approach?
PS it is interesting that users from stack instead of investigating hard problem immediately say that you can not solve it, then reduce novice user's reputation...
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What I should to do to create a system app
There are two types of system apps:
Apps installed on the system partition, which can be accomplished by users with root privileges
Apps signed by the same signing key that signed the firmware
to obtain rights to use android:sharedUserId="android.uid.system"
That definitely would require your app to be signed by the same signing key that signed the firmware. That's true for any android:sharedUserId.
But some guys edit stock apps, prepare zip file which user can update system apps by recovery.
You are welcome to provide any evidence that what they do somehow involves android:sharedUserId="android.uid.system".
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