使用system signature对自己的app进行签名

• In the AndroidManifest.xml of your application: under the 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 /out/host//framework/signapk.jar to sign your app using platform.x509.pem and platform.pk8 in /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.