PMS 保存 Package 信息

PMS 里的 mPackages 保存了所有 应用包的信息

frameworks/base/services/core/java/com/android/server/pm/PackageManagerService.java

public class PackageManagerService implements PackageSender, TestUtilityService {
    // Keys are String (package name), values are Package.
    @Watched
    @GuardedBy("mLock")
    final WatchedArrayMap<String, AndroidPackage> mPackages = new WatchedArrayMap<>();
    

AndroidPackage 封装了应用包的信息

frameworks/base/services/core/java/com/android/server/pm/parsing/pkg/AndroidPackage.java

/**
 * The last state of a package during parsing/install before it is available in {@link
 * com.android.server.pm.PackageManagerService#mPackages}.
 * <p>
 * It is the responsibility of the caller to understand what data is available at what step of the
 * parsing or install process.
 * <p>
 *
 * @hide
 */
public interface AndroidPackage extends ParsingPackageRead, AndroidPackageApi,
        OverlayConfig.PackageProvider.Package {

    /**
     * The package name as declared in the manifest, since the package can be renamed. For example,
     * static shared libs use synthetic package names.
     */
    @NonNull
    String getManifestPackageName();
}

它取代了旧OS 的 PackageParser.Package， 参考：
frameworks/base/core/java/android/content/pm/PackageParser.java

 * @deprecated This class is mostly unused and no new changes should be added to it. Use
 * ParsingPackageUtils and related parsing v2 infrastructure in
 * the core/services parsing subpackages. Or for a quick parse of a provided APK, use
 * {@link PackageManager#getPackageArchiveInfo(String, int)}.
 *
 * @hide
 */
@Deprecated
public class PackageParser {
    /**
     * Representation of a full package parsed from APK files on disk. A package
     * consists of a single base APK, and zero or more split APKs.
     *
     * Deprecated internally. Use AndroidPackage instead.
     */
    public final static class Package implements Parcelable {

AndroidPackageApi 里定义了获取四大组件等的方法

frameworks/base/services/core/java/com/android/server/pm/pkg/AndroidPackageApi.java

/**
 * Explicit interface used for consumers like mainline who need a {@link SystemApi @SystemApi} form
 * of {@link AndroidPackage}. *
 * @hide
 */
//@SystemApi(client = SystemApi.Client.SYSTEM_SERVER)
public interface AndroidPackageApi {
    @NonNull
    List<ParsedActivity> getActivities();
    
    @NonNull
    List<ParsedProvider> getProviders();

    @NonNull
    List<ParsedActivity> getReceivers();

    @NonNull
    List<ParsedService> getServices();
}

而 AndroidPackage 的又被接口 ParsedPackage 继承 （具体实现类在哪里??）
frameworks/base/services/core/java/com/android/server/pm/parsing/pkg/ParsedPackage.java

/**
 * Methods used for mutation after direct package parsing, mostly done inside
 * {@link com.android.server.pm.PackageManagerService}.
 *
 * Java disallows defining this as an inner interface, so this must be a separate file.
 *
 * @hide
 */
public interface ParsedPackage extends AndroidPackage {

    AndroidPackage hideAsFinal();

    ParsedPackage addUsesLibrary(int index, String libraryName);

后续， PMS 是在什么时机保存 各个 apk 的 信息的?