1.先要能被PMS掃描到，在構造函數里添加一條掃描記錄，還要設置加載一些庫的路徑，比如：

public PackageManagerService(Context context, Installer installer,

boolean factoryTest, boolean onlyCore) {

......

File oem3rdAppDir = new File(Environment.getOemDirectory(), "preloadapp");

scanDirLI(oem3rdAppDir, 0, scanFlags, 0);

// Remove disable package settings for updated system apps that were

// removed via an OTA. If the update is no longer present, remove the

// app completely. Otherwise, revoke their system privileges.

for (String deletedAppName : possiblyDeletedUpdatedSystemApps) {

PackageParser.Package deletedPkg = mPackages.get(deletedAppName);

mSettings.removeDisabledSystemPackageLPw(deletedAppName);

......

}

private static void setNativeLibraryPaths(PackageParser.Package pkg, File appLib32InstallDir) {

......

boolean isOem3rdApp = codePath.startsWith("/oem/preloadapp") ? true : false;

if (isApkFile(codeFile) || isOem3rdApp) {。。。。。。}

2.直接掃描進去可能會遇到一下問題，比如APP啟動報錯，卸載后重啟會又加載到APP等。

2.1 APP啟動報錯，這可能涉及到證書的問題，預制APP可以不用檢查證書，

可以在 PackageParser.java 里添加如下：

private static void collectCertificates(Package pkg, File apkFile, int parseFlags)

throws PackageParserException {

......

StrictJarFile jarFile = null;

try {

Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "strictJarFileCtor");

// Ignore signature stripping protections when verifying APKs from system partition.

// For those APKs we only care about extracting signer certificates, and don't care

// about verifying integrity.

boolean signatureSchemeRollbackProtectionsEnforced =

(parseFlags & PARSE_IS_SYSTEM_DIR) == 0;

boolean IsPrebuiltApp = apkPath != null

&& apkPath.startsWith("/oem/preloadapp");

jarFile = new StrictJarFile(

apkPath,

!verified, // whether to verify JAR signature

IsPrebuiltApp ? false : signatureSchemeRollbackProtectionsEnforced);

Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);

......

2.2 卸載后重啟會又加載到APP，因為系統每次啟動都會去掃描，所以出現此問題的解決思路是在卸載之后把改APP記錄到某個文件，開機后每次掃描的時候做個判斷，如果是被卸載的預制APP，則直接返回，比如：

private boolean deletePackageLIF(String packageName, UserHandle user,

boolean deleteCodeAndResources, int[] allUserHandles, int flags,

PackageRemovedInfo outInfo, boolean writeSettings,

PackageParser.Package replacingPackage) {

......

if (isSystemApp(ps)) {

if (DEBUG_REMOVE) Slog.d(TAG, "Removing system package: " + ps.name);

// When an updated system application is deleted we delete the existing resources

// as well and fall back to existing code in system partition

ret = deleteSystemPackageLIF(ps.pkg, ps, allUserHandles, flags, outInfo, writeSettings);

} else {

if (DEBUG_REMOVE) Slog.d(TAG, "Removing non-system package: " + ps.name);

if(ps.pkg != null && ps.pkg.baseCodePath != null){

String path = ps.pkg.baseCodePath.substring(0, ps.pkg.baseCodePath.lastIndexOf("/"));

這里根據卸載APP的path判斷是否是需要預留的APP，如果是則記錄到文件

}

ret = deleteInstalledPackageLIF(ps, deleteCodeAndResources, flags, allUserHandles,

outInfo, writeSettings, replacingPackage);

}

......

}

private PackageParser.Package scanPackageLI(PackageParser.Package pkg, File scanFile,

final int policyFlags, int scanFlags, long currentTime, @Nullable UserHandle user)

throws PackageManagerException {

這里可以判斷是否是已經卸載的預制APP，如果是則直接返回，不用繼續加載

if(。。。。。。)return pkg;

。。。。。。

}

總結

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