1.前言

 在android10.0的系统rom定制化开发中，在对于app启动时，通过Launcher调用pms来查询app的相关ActivityInfo的相关信息，然后调用
ams来启动activity，这篇来分析pms中获取app的ActivityInfo的相关信息的相关源码分析

2.pms中关于启动app时获取app的ActivityInfo信息相关源码分析的核心类

frameworksaseservicescorejavacomandroidserverpmPackageManagerService.java

3.pms中关于启动app时获取app的ActivityInfo信息相关源码分析的核心功能分析和实现

   private class PackageManagerInternalImpl extends PackageManagerInternal {
        @Override
        public ResolveInfo resolveIntent(Intent intent, String resolvedType,
                int flags, int userId, boolean resolveForStart, int filterCallingUid) {
            return resolveIntentInternal(
                    intent, resolvedType, flags, userId, resolveForStart, filterCallingUid);
        }

        @Override
        public ResolveInfo resolveService(Intent intent, String resolvedType,
                int flags,