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I've downloaded and compiled Android 2.1 version with signed-google_ion-ota-14721.zip image for my HTC phone. The compile completed successfully and so the system image flash. How can I sign my own Android application with the system signature?
Can someone describe the whole process for signing a user application with system signature as I am completely new to the signing process.
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You need to set SignatureMainLayout as the primary content view in your mainactivity. java file. For adding the button and the signature view you need to add the given code in SignatureMainLayout. java file which contains two classes which returns user interface.
You can only sign your application like a system app if you are building Android from source for your project. The AOSP signing keys are blocked in play store, FWIK. So if you sign your app with that key it won't publish on play store.
Android requires that all apps be digitally signed with a certificate before they can be installed. Android uses this certificate to identify the author of an app, and the certificate does not need to be signed by a certificate authority. Android apps often use self-signed certificates.
Every application that is run on the Android platform must be signed by the developer. Applications that attempt to install without being signed will be rejected by either Google Play or the package installer on the Android device.
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.xmlof your application: under the<manifest>element, add the attributeandroid: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.jarto sign your app usingplatform.x509.pemandplatform.pk8in<root-of-android-source-tree>/build/target/product/securitygenerated 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 psto confirm that your app is running as system.
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