PackageManagerService PMS扫描已安装的apk,解析其AndroidManifest.xml获取App相关信息,如下是其构造函数的相关片段 ...... if (partition.getPrivAppFolder() != null) { //扫描系统应用,路径/system/priv-app scanDirTracedLI(partition.getPrivAppFolder(), systemParseFlags, systemScanFlags | SCAN_AS_PRIVILEGED | partition.scanFlag, 0, packageParser, executorService); }...... //扫描系统应用,路径/system/app scanDirTracedLI(partition.getAppFolder(), systemParseFlags, systemScanFlags | partition.scanFlag, 0, packageParser, executorService); ......