PMS安装APP流程解析

public void handleStartCopy() throws RemoteException {
    ...
    //确定APK的安拆职位地方。onSd：安拆到SD卡， onInt：外部存储即Data分区，ephemeral：安拆莅临时存储（Instant Apps安拆）            
    final boolean onSd = (installFlags & PackageManager.INSTALL_EXTERNAL) != 0;
    final boolean onInt = (installFlags & PackageManager.INSTALL_INTERNAL) != 0;
    final boolean ephemeral = (installFlags & PackageManager.INSTALL_INSTANT_APP) != 0;
    PackageInfoLite pkgLite = null;
    if (onInt && onSd) {
        // APK不克不及异时安拆正在SD卡以及Data分区
        Slog.w(TAG, "Conflicting flags specified for installing on both internal and external");
        ret = PackageManager.INSTALL_FAILED_INVALID_INSTALL_LOCATION;
        //安拆标记矛盾，Instant Apps不克不及安拆到SD卡外
    } else if (onSd && ephemeral) {
        Slog.w(TAG,  "Conflicting flags specified for installing ephemeral on external");
        ret = PackageManager.INSTALL_FAILED_INVALID_INSTALL_LOCATION;
    } else {
        //猎取APK的大批的疑息
        pkgLite = mContainerService.getMinimalPackageInfo(origin.resolvedPath, installFlags, packageAbiOverride);
        if (DEBUG_EPHEMERAL && ephemeral) {
            Slog.v(TAG, "pkgLite for install: " + pkgLite);
        }
        ...
        if (ret == PackageManager.INSTALL_SUCCEEDED) {
            //鉴定安拆的职位地方
            int loc = pkgLite.reco妹妹endedInstallLocation;
            if (loc == PackageHelper.RECOMMEND_FAILED_INVALID_LOCATION) {
               ret = PackageManager.INSTALL_FAILED_INVALID_INSTALL_LOCATION;
            } else if (loc == PackageHelper.RECOMMEND_FAILED_ALREADY_EXISTS) {
               ret = PackageManager.INSTALL_FAILED_ALREADY_EXISTS;
            } 
            ...
        }else {
            loc = installLocationPolicy(pkgLite);     //确定APP安拆的职位地方
             ...
        }
    }
    //依照InstallParams建立InstallArgs器械
    final InstallArgs args = createInstallArgs(this);    InstallArgs做历时：复造以及重定名APK
    mArgs = args;
    if (ret == PackageManager.INSTALL_SUCCEEDED) {
        ...
        if (!origin.existing && requiredUid != -1 && isVerificationEnabled(verifierUser.getIdentifier(), installFlags, installerUid)) {
           ...
        } else{
            ret = args.copyApk(mContainerService, true);     // InstallArgs入手下手复造APP
        }
    }
    mRet = ret;
}

private int doCopyApk(IMediaContainerService imcs, boolean temp) throws RemoteException {
    ...
    try {
        final boolean isEphemeral = (installFlags & PackageManager.INSTALL_INSTANT_APP) != 0;
        //建立姑且文件存储目次
        final File tempDir = mInstallerService.allocateStageDirLegacy(volumeUuid, isEphemeral);
        codeFile = tempDir;
        resourceFile = tempDir;
    } catch (IOException e) {
        Slog.w(TAG, "Failed to create copy file: " + e);
        return PackageManager.INSTALL_FAILED_INSUFFICIENT_STORAGE;
    }
    ...
    int ret = PackageManager.INSTALL_SUCCEEDED;
    ret = imcs.copyPackage(origin.file.getAbsolutePath(), target);
    ...
    return ret;
}

安拆APK

• 正在安拆前搜查能否情况的靠得住，若何弗成靠会排除复造的APK文件。
• installPackageTracedLI其外部会挪用PMS的installPackageLI办法，入止APP安拆。
• 处置安拆后独霸，若何安拆不行罪，增除了失落安拆相闭的目次取文件。

final boolean startCopy() {
    ......
    handleStartCopy();  //APP文件复造拷贝
    .....
    //入手下手安拆APP
    handleReturnCode();
}
   
void handleReturnCode() {
    ........
    if (mArgs != null) {
        processPendingInstall(mArgs, mRet);
    }
}

private void processPendingInstall(final InstallArgs args, final int currentStatus) {
    mHandler.post(new Runnable() {
        public void run() {
            mHandler.removeCallbacks(this);
            PackageInstalledInfo res = new PackageInstalledInfo();
            res.setReturnCode(currentStatus);
            res.uid = -1;
            res.pkg = null;
            res.removedInfo = null;
            if (res.returnCode == PackageManager.INSTALL_SUCCEEDED) {
                //安拆前措置
                args.doPreInstall(res.returnCode);
                synchronized (mInstallLock) {
                    //入手下手安拆
                    installPackageTracedLI(args, res);
                }
                //安拆后扫尾
                args.doPostInstall(res.returnCode, res.uid);
            }
            ...
        }
    });
}