?????? android ??API?????? SystemClock.setCurrentTimeMillis()??????????????????????????????????????????????????????????????????logcat???????"Unable to open alarm driver: Permission denied ".??????????root???????????????????в?????á?

?????????????а?????ó???????????????????????????????t?????????????????????

??????????????????????????Android?????????????make??????

????1. ????ó????AndroidManifest.xml?е?manifest????м???android:sharedUserId="android.uid.system"????????

????2. ???Android.mk?????????LOCAL_CERTIFICATE := platform?????

????3. ???mm???????????????apk?????????????????

??????????????鷳????????????????????????????make??????

????1. ????????android:sharedUserId="android.uid.system"????????

????2. ???eclipse?????apk????????????apk????????????

????3. ??????????apk????????META-INF???μ?CERT.SF??CERT.RSA?????????

????4. ??????????platform??????????apk??????????????鷳??????????????????????Android??????е?λ????"build argetproductsecurity"???????platform.pk8??platform.x509.pem??????????????Android????Signapk???????????signapk???????????"build oolssignapk"?￡??÷??"signapk platform.x509.pem platform.pk8 input.apk output.apk"????????????·??????????????????????????????á?

??????????????apk??????????????????

???????????????????????android:sharedUserId="android.uid.system"???????????Shared User id?????????User id????APK???????ó????????????????С??????????UID???android.uid.system???????ó????????????????У???????????????????????

??????????UID?????????????????APK???????????????????????????????????????????????????л???????????platform key????????????????????platform.pk8??platform.x509.pem?????????????????key?????apk????????????????????С???????????м???LOCAL_CERTIFICATE := platform?????????????key???????

???????????????????????????????????????Android???????????????????в??????????????????????????platform.pk8??platform.x509.pem????????????????????Android?????????????????????????Android?е?key????????????????????????OK?????????G3??????????"Package ... has no signatures that match those in shared user android.uid.system"??????????????????????

????????￡????android:sharedUserId???????????apk??????????У????????????APK??????????????У????????????????????????????