Signing My Android Application as System App

Signing my android application as system app

Well below is your answer,

1. You can find platform keys from
   HERE. The command to sign apk (for linux) is:

   java -jar signapk.jar -w platform.x509.pem platform.pk8 APPLICATION.apk APPLICATION_sign.apk

   onward Android 10 lib64 library path need to provided which can be found at android/out/host/linux-x86 after generating a successful build, one can copy folder or simply provide its path to generate sign APK

   java -Djava.library.path="<path to lib64>" -jar signapk.jar -w platform.x509.pem platform.pk8

2. If you sign your apk with platform keys you won't required root access you can simply install it from "adb install" command, and yes in someway it is like root 'cos it can access all internal api but keep in mind if your app is system signed then you can't write external storage.

3. First of all don't combine both root is user where system app is application type which distinguish from normal application below link might clear your confusion regarding it.

   what-is-the-difference-between-android-user-app-with-root-access-and-a-system-ap

Android :Signing in android app with system signature

It was my mistake to not analyze it further, I tried installing it with
adb install -r ".apk"
and found the exact error, which is "signatures are not matching". Then I contacted the manufacturer and the problem was solved.

How to sign Android app with system signature?

Finally I managed to discover a way to sign my application with the platform signature. You need to use keys located in <root-of-android-source-tree>/build/target/product/security/ and add android:sharedUserId="android.uid.system" in your AndroidManifest.xml file.

Details from this google groups thread:

On top of signing Android 1.6 for Dream with certificates generated by
myself, I've also managed to sign my app with the platform certificate
and run it with the system sharedUserId. These are the steps I took:

• Build and flash to your Dream your own Android using https://web.archive.org/web/20081211205758/http://source.android.com:80/documentation/building-for-dream. Use the
  mkkey.sh script on
  https://web.archive.org/web/20091213215940/http://pdk.android.com/online-pdk/guide/release_keys.html to create
  new certificates, including x509 certificates before you do 'make'.
• In the AndroidManifest.xml of your application: under the <manifest> element, add the attribute android:sharedUserId="android.uid.system".
• Export an unsigned version of your Android application using Eclipse: right-click on the project >> Android Tools >> Export
  Unsigned Application Package.

• Use <root-of-android-source-tree>/out/host/<your-host>/framework/signapk.jar to sign your app using platform.x509.pem and platform.pk8 in <root-of-android-source-tree>/build/target/product/security
  generated earlier:

  java -jar signapk.jar platform.x509.pem platform.pk8 YourApp-unsigned.apk YourApp-signed.apk.
  

• Install the app to your device:

  adb install YourApp-signed.apk
  

• Run your app
• Use adb shell ps to confirm that your app is running as system.

How do I sign an Android application as a system app to use DEVICE_POWER permission

You can only sign your application as a system app if you are building Android from source for your project. If you're interested in a hack that will only work on your phone see:

How to sign Android app with system signature?

Create System Application

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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