Android8.1--PackageInstaller

主要是PackageInstallerActivity类, 安装过程中一些状态转换与判断都在这个Activity中进行.

入口函数onCreated方法。

    @Overrideprotected void onCreate(Bundle icicle) {super.onCreate(icicle);if (icicle != null) {mAllowUnknownSources = icicle.getBoolean(ALLOW_UNKNOWN_SOURCES_KEY);}mPm = getPackageManager();//PackageManagermIpm = AppGlobals.getPackageManager();//IPackageManagermAppOpsManager = (AppOpsManager) getSystemService(Context.APP_OPS_SERVICE);mInstaller = mPm.getPackageInstaller();//PackageInstallermUserManager = (UserManager) getSystemService(Context.USER_SERVICE);final Intent intent = getIntent();mCallingPackage = intent.getStringExtra(EXTRA_CALLING_PACKAGE);mSourceInfo = intent.getParcelableExtra(EXTRA_ORIGINAL_SOURCE_INFO);//ApplicationInfomOriginatingUid = intent.getIntExtra(Intent.EXTRA_ORIGINATING_UID,PackageInstaller.SessionParams.UID_UNKNOWN);mOriginatingPackage = (mOriginatingUid != PackageInstaller.SessionParams.UID_UNKNOWN)? getPackageNameForUid(mOriginatingUid) : null;//The package name corresponding to mOriginatingUidfinal Uri packageUri;if (PackageInstaller.ACTION_CONFIRM_PERMISSIONS.equals(intent.getAction())) {final int sessionId = intent.getIntExtra(PackageInstaller.EXTRA_SESSION_ID, -1);//sessionIdfinal PackageInstaller.SessionInfo info = mInstaller.getSessionInfo(sessionId);if (info == null || !info.sealed || info.resolvedBaseCodePath == null) {Log.w(TAG, "Session " + mSessionId + " in funky state; ignoring");finish();return;}mSessionId = sessionId;packageUri = Uri.fromFile(new File(info.resolvedBaseCodePath));mOriginatingURI = null;mReferrerURI = null;} else {mSessionId = -1;packageUri = intent.getData();mOriginatingURI = intent.getParcelableExtra(Intent.EXTRA_ORIGINATING_URI);mReferrerURI = intent.getParcelableExtra(Intent.EXTRA_REFERRER);}// if there's nothing to do, quietly slip into the etherif (packageUri == null) {Log.w(TAG, "Unspecified source");setPmResult(PackageManager.INSTALL_FAILED_INVALID_URI);finish();return;}if (DeviceUtils.isWear(this)) {//不支持传递设备showDialogInner(DLG_NOT_SUPPORTED_ON_WEAR);return;}boolean wasSetUp = processPackageUri(packageUri);if (!wasSetUp) {return;}// load dummy layout with OK button disabled until we override this layout in// startInstallConfirmbindUi(R.layout.install_confirm, false);checkIfAllowedAndInitiateInstall();}

（1）这里看下processPackageUri()

    /*** Parse the Uri and set up the installer for this package.* 解析URI，并建立PackageInstaller* @param packageUri The URI to parse** @return {@code true} iff the installer could be set up*/private boolean processPackageUri(final Uri packageUri) {mPackageURI = packageUri;final String scheme = packageUri.getScheme();switch (scheme) {case SCHEME_PACKAGE: {try {mPkgInfo = mPm.getPackageInfo(packageUri.getSchemeSpecificPart(),PackageManager.GET_PERMISSIONS| PackageManager.MATCH_UNINSTALLED_PACKAGES);} catch (NameNotFoundException e) {}if (mPkgInfo == null) {Log.w(TAG, "Requested package " + packageUri.getScheme()+ " not available. Discontinuing installation");showDialogInner(DLG_PACKAGE_ERROR);setPmResult(PackageManager.INSTALL_FAILED_INVALID_APK);return false;}mAppSnippet = new PackageUtil.AppSnippet(mPm.getApplicationLabel(mPkgInfo.applicationInfo),mPm.getApplicationIcon(mPkgInfo.applicationInfo));} break;case ContentResolver.SCHEME_FILE: {File sourceFile = new File(packageUri.getPath());//根据uri创建一个文件对象PackageParser.Package parsed = PackageUtil.getPackageInfo(this, sourceFile);//解析文件// Check for parse errorsif (parsed == null) {Log.w(TAG, "Parse error when parsing manifest. Discontinuing installation");showDialogInner(DLG_PACKAGE_ERROR);setPmResult(PackageManager.INSTALL_FAILED_INVALID_APK);return false;}mPkgInfo = PackageParser.generatePackageInfo(parsed, null,PackageManager.GET_PERMISSIONS, 0, 0, null,new PackageUserState());//解析获得PackageInfo，获取权限部分mAppSnippet = PackageUtil.getAppSnippet(this, mPkgInfo.applicationInfo, sourceFile);//获取PackageUtil.AppSnippet} break;default: {throw new IllegalArgumentException("Unexpected URI scheme " + packageUri);}}return true;}

AppSnippet中只有两个属性，应用的lable，icon。

可以看出 processPackageUrl调用framework的api获取了apk的权限信息与应用名称与图标。

（2）然后就是判断该包是否允许安装，如果允许则初始化准备安装。首先在checkIfAllowedAndInitiateInstall中判断是否是未知来源的应用, 一般是开启允许未知来源的。直接开启初始化安装。

    /*** Check if it is allowed to install the package and initiate install if allowed. If not allowed* show the appropriate dialog.*/private void checkIfAllowedAndInitiateInstall() {// Check for install apps user restriction first.首先检查用户限制final int installAppsRestrictionSource = mUserManager.getUserRestrictionSource(UserManager.DISALLOW_INSTALL_APPS, Process.myUserHandle());if ((installAppsRestrictionSource & UserManager.RESTRICTION_SOURCE_SYSTEM) != 0) {showDialogInner(DLG_INSTALL_APPS_RESTRICTED_FOR_USER);return;} else if (installAppsRestrictionSource != UserManager.RESTRICTION_NOT_SET) {startActivity(new Intent(Settings.ACTION_SHOW_ADMIN_SUPPORT_DETAILS));//激活设备权限finish();return;}if (mAllowUnknownSources || !isInstallRequestFromUnknownSource(getIntent())) {initiateInstall();//初始化安装} else {// Check for unknown sources restriction检查未知源限制final int unknownSourcesRestrictionSource = mUserManager.getUserRestrictionSource(UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES, Process.myUserHandle());if ((unknownSourcesRestrictionSource & UserManager.RESTRICTION_SOURCE_SYSTEM) != 0) {showDialogInner(DLG_UNKNOWN_SOURCES_RESTRICTED_FOR_USER);} else if (unknownSourcesRestrictionSource != UserManager.RESTRICTION_NOT_SET) {startActivity(new Intent(Settings.ACTION_SHOW_ADMIN_SUPPORT_DETAILS));finish();} else {handleUnknownSources();}}}

（3）initiateInstall仅仅获取一下本机是否安装了该应用, 如果安装获取到该应用的信息.

    private void initiateInstall() {String pkgName = mPkgInfo.packageName;// Check if there is already a package on the device with this name// but it has been renamed to something else.String[] oldName = mPm.canonicalToCurrentPackageNames(new String[] { pkgName });if (oldName != null && oldName.length > 0 && oldName[0] != null) {pkgName = oldName[0];mPkgInfo.packageName = pkgName;mPkgInfo.applicationInfo.packageName = pkgName;}// Check if package is already installed. display confirmation dialog if replacing pkgtry {// This is a little convoluted because we want to get all uninstalled// apps, but this may include apps with just data, and if it is just// data we still want to count it as "installed".如果仅有一个应用的数据，仍然认为是已安装的。mAppInfo = mPm.getApplicationInfo(pkgName,PackageManager.MATCH_UNINSTALLED_PACKAGES);if ((mAppInfo.flags&ApplicationInfo.FLAG_INSTALLED) == 0) {mAppInfo = null;//如果没有安装，将ApplicationInfo置空}} catch (NameNotFoundException e) {mAppInfo = null;}startInstallConfirm();}

（4）最后startInstallConfirm()方法中显示了界面中显示的权限列表以及确认取消列表。

    private void startInstallConfirm() {// We might need to show permissions, load layout with permissionsif (mAppInfo != null) {bindUi(R.layout.install_confirm_perm_update, true);} else {bindUi(R.layout.install_confirm_perm, true);}((TextView) findViewById(R.id.install_confirm_question)).setText(R.string.install_confirm_question);ViewPager viewPager = (ViewPager)findViewById(R.id.pager);TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);TabsTitleAdapter adapter = new TabsTitleAdapter(this);viewPager.setAdapter(adapter);tabLayout.setTabMode(TabLayout.MODE_FIXED);tabLayout.setupWithViewPager(viewPager);// If the app supports runtime permissions the new permissions will如果应用程序支持运行时权限，// be requested at runtime, hence we do not show them at install.则将在运行时请求新权限，因此我们不会在安装时显示它们。boolean supportsRuntimePermissions = mPkgInfo.applicationInfo.targetSdkVersion>= Build.VERSION_CODES.M;boolean permVisible = false;mScrollView = null;mOkCanInstall = false;int msg = 0;int position = 0;AppSecurityPermissions perms = new AppSecurityPermissions(this, mPkgInfo);final int N = perms.getPermissionCount(AppSecurityPermissions.WHICH_ALL);if (mAppInfo != null) {msg = (mAppInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0//系统应用? R.string.install_confirm_question_update_system//是否要为这一内置应用安装更新？您现有的数据不会丢失，且安装过程无需任何特殊权限。: R.string.install_confirm_question_update;mScrollView = new CaffeinatedScrollView(this);mScrollView.setFillViewport(true);boolean newPermissionsFound = false;if (!supportsRuntimePermissions) {newPermissionsFound =(perms.getPermissionCount(AppSecurityPermissions.WHICH_NEW) > 0);if (newPermissionsFound) {permVisible = true;mScrollView.addView(perms.getPermissionsView(AppSecurityPermissions.WHICH_NEW));//普通权限显示到界面上}}if (!supportsRuntimePermissions && !newPermissionsFound) {LayoutInflater inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);TextView label = (TextView)inflater.inflate(R.layout.label, null);label.setText(R.string.no_new_perms);//没有可显示的权限mScrollView.addView(label);}tabLayout.addTab(tabLayout.newTab().setTag(TAB_ID_NEW).setText(getText(R.string.newPerms)));adapter.addTab(position, getText(R.string.newPerms).toString(), mScrollView);position ++;} else  {tabLayout.setVisibility(View.GONE);}if (!supportsRuntimePermissions && N > 0) {permVisible = true;LayoutInflater inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);View root = inflater.inflate(R.layout.permissions_list, null);if (mScrollView == null) {mScrollView = (CaffeinatedScrollView)root.findViewById(R.id.scrollview);}((ViewGroup)root.findViewById(R.id.permission_list)).addView(perms.getPermissionsView(AppSecurityPermissions.WHICH_ALL));tabLayout.addTab(tabLayout.newTab().setTag(TAB_ID_ALL).setText(getText(R.string.allPerms)));adapter.addTab(position, getText(R.string.allPerms).toString(), root);}if (!permVisible) {if (mAppInfo != null) {// This is an update to an application, but there are no// permissions at all.msg = (mAppInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0? R.string.install_confirm_question_update_system_no_perms: R.string.install_confirm_question_update_no_perms;} else {// This is a new application with no permissions.msg = R.string.install_confirm_question_no_perms;}// We do not need to show any permissions, load layout without permissionsbindUi(R.layout.install_confirm, true);mScrollView = null;}if (msg != 0) {((TextView)findViewById(R.id.install_confirm_question)).setText(msg);}if (mScrollView == null) {// There is nothing to scroll view, so the ok button is immediately// set to install.mOk.setText(R.string.install);mOkCanInstall = true;} else {mScrollView.setFullScrollAction(new Runnable() {@Overridepublic void run() {mOk.setText(R.string.install);mOkCanInstall = true;}});}}

查看点击OK的事件，确定安装事件为:

    private void startInstall() {// Start subactivity to actually install the application启动子Activity，进行实际安装Intent newIntent = new Intent();newIntent.putExtra(PackageUtil.INTENT_ATTR_APPLICATION_INFO,mPkgInfo.applicationInfo);newIntent.setData(mPackageURI);newIntent.setClass(this, InstallInstalling.class);//跳转到InstallInstalling类String installerPackageName = getIntent().getStringExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME);if (mOriginatingURI != null) {newIntent.putExtra(Intent.EXTRA_ORIGINATING_URI, mOriginatingURI);}if (mReferrerURI != null) {newIntent.putExtra(Intent.EXTRA_REFERRER, mReferrerURI);}if (mOriginatingUid != PackageInstaller.SessionParams.UID_UNKNOWN) {newIntent.putExtra(Intent.EXTRA_ORIGINATING_UID, mOriginatingUid);}if (installerPackageName != null) {newIntent.putExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME,installerPackageName);}if (getIntent().getBooleanExtra(Intent.EXTRA_RETURN_RESULT, false)) {newIntent.putExtra(Intent.EXTRA_RETURN_RESULT, true);newIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);}if(localLOGV) Log.i(TAG, "downloaded app uri="+mPackageURI);startActivity(newIntent);//跳转finish();}

好吧，安装确认后跳转到安装进度页面，具体安装过程也在这个界面中。

（5）在InstallInstalling的onCreate方法里，有两个主要步骤，一个是PackageParser.parsePackageLite，他解析apk里面的部分信息出来；另一个是getPackageInstaller().createSession，它负责创建一个会话，用于后续的安装，会话是通过binder调用在PackageInstallerServices里面创建的。

    @Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setAcuteagContentView(R.layout.install_installing);ApplicationInfo appInfo = getIntent().getParcelableExtra(PackageUtil.INTENT_ATTR_APPLICATION_INFO);//获取ApplicationInfomPackageURI = getIntent().getData();//apk对应的uriif ("package".equals(mPackageURI.getScheme())) {try {getPackageManager().installExistingPackage(appInfo.packageName);launchSuccess();} catch (PackageManager.NameNotFoundException e) {launchFailure(PackageManager.INSTALL_FAILED_INTERNAL_ERROR, null);}} else {final File sourceFile = new File(mPackageURI.getPath());PackageUtil.initSnippetForNewApp(this, PackageUtil.getAppSnippet(this, appInfo,sourceFile), R.id.app_snippet);if (savedInstanceState != null) {mSessionId = savedInstanceState.getInt(SESSION_ID);mInstallId = savedInstanceState.getInt(INSTALL_ID);// Reregister for result; might instantly call back if result was delivered while// activity was destroyedtry {InstallEventReceiver.addObserver(this, mInstallId,this::launchFinishBasedOnResult);//添加监听器} catch (EventResultPersister.OutOfIdsException e) {// Does not happen}} else {PackageInstaller.SessionParams params = new PackageInstaller.SessionParams(PackageInstaller.SessionParams.MODE_FULL_INSTALL);params.referrerUri = getIntent().getParcelableExtra(Intent.EXTRA_REFERRER);params.originatingUri = getIntent().getParcelableExtra(Intent.EXTRA_ORIGINATING_URI);params.originatingUid = getIntent().getIntExtra(Intent.EXTRA_ORIGINATING_UID,UID_UNKNOWN);File file = new File(mPackageURI.getPath());try {PackageParser.PackageLite pkg = PackageParser.parsePackageLite(file, 0);//解析APKparams.setAppPackageName(pkg.packageName);params.setInstallLocation(pkg.installLocation);params.setSize(PackageHelper.calculateInstalledSize(pkg, false, params.abiOverride));} catch (PackageParser.PackageParserException e) {Log.e(LOG_TAG, "Cannot parse package " + file + ". Assuming defaults.");Log.e(LOG_TAG,"Cannot calculate installed size " + file + ". Try only apk size.");params.setSize(file.length());} catch (IOException e) {Log.e(LOG_TAG,"Cannot calculate installed size " + file + ". Try only apk size.");params.setSize(file.length());}try {mInstallId = InstallEventReceiver.addObserver(this, EventResultPersister.GENERATE_NEW_ID,this::launchFinishBasedOnResult);} catch (EventResultPersister.OutOfIdsException e) {launchFailure(PackageManager.INSTALL_FAILED_INTERNAL_ERROR, null);}try {mSessionId = getPackageManager().getPackageInstaller().createSession(params);//创建一个Session} catch (IOException e) {launchFailure(PackageManager.INSTALL_FAILED_INTERNAL_ERROR, null);}}mCancelButton = (Button) findViewById(R.id.cancel_button);mCancelButton.setOnClickListener(view -> {if (mInstallingTask != null) {mInstallingTask.cancel(true);}if (mSessionId > 0) {getPackageManager().getPackageInstaller().abandonSession(mSessionId);mSessionId = 0;}setResult(RESULT_CANCELED);finish();});mSessionCallback = new InstallSessionCallback();}}

（6）在InstallInstalling.java的onResume启动一个异步task InstallingAsyncTask

    @Overrideprotected void onResume() {super.onResume();// This is the first onResume in a single life of the activityif (mInstallingTask == null) {PackageInstaller installer = getPackageManager().getPackageInstaller();PackageInstaller.SessionInfo sessionInfo = installer.getSessionInfo(mSessionId);if (sessionInfo != null && !sessionInfo.isActive()) {mInstallingTask = new InstallingAsyncTask();//异步任务mInstallingTask.execute();} else {// we will receive a broadcast when the install is finishedmCancelButton.setEnabled(false);setFinishOnTouchOutside(false);}}}

（7）InstallingAsyncTask主要是操作session，session也通过binder方式来操作，主要完成的工作是通过之前建立的session，创建文件夹，将文件拷贝到安装目录下面

    /*** Send the package to the package installer and then register a event result observer that* will call {@link #launchFinishBasedOnResult(int, int, String)}*/private final class InstallingAsyncTask extends AsyncTask<Void, Void,PackageInstaller.Session> {volatile boolean isDone;@Overrideprotected PackageInstaller.Session doInBackground(Void... params) {PackageInstaller.Session session;try {session = getPackageManager().getPackageInstaller().openSession(mSessionId);//openSession} catch (IOException e) {return null;}session.setStagingProgress(0);try {File file = new File(mPackageURI.getPath());try (InputStream in = new FileInputStream(file)) {long sizeBytes = file.length();try (OutputStream out = session.openWrite("PackageInstaller", 0, sizeBytes)) {byte[] buffer = new byte[1024 * 1024];while (true) {int numRead = in.read(buffer);if (numRead == -1) {session.fsync(out);break;}if (isCancelled()) {session.close();break;}out.write(buffer, 0, numRead);if (sizeBytes > 0) {float fraction = ((float) numRead / (float) sizeBytes);session.addProgress(fraction);}}}}return session;} catch (IOException | SecurityException e) {Log.e(LOG_TAG, "Could not write package", e);session.close();return null;} finally {synchronized (this) {isDone = true;notifyAll();}}}

目前为止apk的安装都只是在PackageInstaller apk和framework的PackageInstaller框架之间交换，还没有涉及到PMS，这一点是怎么做到的呢，如果没有PMS参与，就没有参考文档里面我们了解的那些对manifest的解析、权限处理、文件拷贝和dex优化等相关流程，这里就产生了割裂感。

（8）PMS在上层的接口类是APM，通过PM类在PackageInstaller和PackageInstallerSession的引用就能找到相关的关联关系。在异步taskInstallingAsyncTask的方法中调用commit。

        @Overrideprotected void onPostExecute(PackageInstaller.Session session) {if (session != null) {Intent broadcastIntent = new Intent(BROADCAST_ACTION);broadcastIntent.setFlags(Intent.FLAG_RECEIVER_FOREGROUND);broadcastIntent.setPackage(getPackageManager().getPermissionControllerPackageName());broadcastIntent.putExtra(EventResultPersister.EXTRA_ID, mInstallId);PendingIntent pendingIntent = PendingIntent.getBroadcast(InstallInstalling.this,mInstallId,broadcastIntent,PendingIntent.FLAG_UPDATE_CURRENT);session.commit(pendingIntent.getIntentSender());mCancelButton.setEnabled(false);setFinishOnTouchOutside(false);} else {getPackageManager().getPackageInstaller().abandonSession(mSessionId);if (!isCancelled()) {launchFailure(PackageManager.INSTALL_FAILED_INVALID_APK, null);}}}}

PackageInstaller.Session的commit方法：

        public void commit(@NonNull IntentSender statusReceiver) {try {mSession.commit(statusReceiver, false);} catch (RemoteException e) {throw e.rethrowFromSystemServer();}}

然后，通过binder，在PackageInstallerSession.java里，调用commit，给handler发一个消息MSG_COMMIT

         final PackageInstallObserverAdapteradapter = new PackageInstallObserverAdapter(mContext,statusReceiver, sessionId, mIsInstallerDeviceOwner, userId);mHandler.obtainMessage(MSG_COMMIT, adapter.getBinder()).sendToTarget();

然后Handler.Callback mHandlerCallback再调用commitLocked()，这里就开始调用到PMS的安装接口了，然后就是PMS的流程

     private void commitLocked() throwsPackageManagerException {…// Unpack nativelibrariesextractNativeLibraries(mResolvedStageDir, params.abiOverride);。。。mRelinquished =true;mPm.installStage(mPackageName,stageDir, stageCid, localObserver, params,installerPackageName, installerUid, user, mCertificates);}

下面就进入frameworks层的PackageManagerService里去了。

2、AppSecurityPermissions

AppSecurityPermissions中的mPermsList保存了应用的权限信息。

    public AppSecurityPermissions(Context context, PackageInfo info) {this(context);Set<MyPermissionInfo> permSet = new HashSet<MyPermissionInfo>();if(info == null) {return;}mPackageName = info.packageName;// Convert to a PackageInfoPackageInfo installedPkgInfo = null;// Get requested permissionsif (info.requestedPermissions != null) {try {installedPkgInfo = mPm.getPackageInfo(info.packageName,PackageManager.GET_PERMISSIONS);//获得一个PackageInfo} catch (NameNotFoundException e) {}extractPerms(info, permSet, installedPkgInfo);//调用extractPerms方法，permission保存在permSet中}// Get permissions related to shared user if anyif (info.sharedUserId != null) {int sharedUid;try {sharedUid = mPm.getUidForSharedUser(info.sharedUserId);getAllUsedPermissions(sharedUid, permSet);} catch (NameNotFoundException e) {Log.w(TAG, "Couldn't retrieve shared user id for: " + info.packageName);}}// Retrieve list of permissionsmPermsList.addAll(permSet);setPermissions(mPermsList);}

extractPerms方法，从PackageInfo对象中获取的权限保存到permSet中。

    private void extractPerms(PackageInfo info, Set<MyPermissionInfo> permSet,PackageInfo installedPkgInfo) {String[] strList = info.requestedPermissions;//列出来AndroidManifest中所需要的权限，int[] flagsList = info.requestedPermissionsFlags;if ((strList == null) || (strList.length == 0)) {return;}for (int i=0; i<strList.length; i++) {String permName = strList[i];try {PermissionInfo tmpPermInfo = mPm.getPermissionInfo(permName, 0);//获取PermissionInfoif (tmpPermInfo == null) {continue;}int existingIndex = -1;if (installedPkgInfo != null&& installedPkgInfo.requestedPermissions != null) {for (int j=0; j<installedPkgInfo.requestedPermissions.length; j++) {if (permName.equals(installedPkgInfo.requestedPermissions[j])) {existingIndex = j;break;}}}final int existingFlags = existingIndex >= 0 ?installedPkgInfo.requestedPermissionsFlags[existingIndex] : 0;if (!isDisplayablePermission(tmpPermInfo, flagsList[i], existingFlags)) {// This is not a permission that is interesting for the user// to see, so skip it.continue;}final String origGroupName = tmpPermInfo.group;String groupName = origGroupName;if (groupName == null) {groupName = tmpPermInfo.packageName;tmpPermInfo.group = groupName;}MyPermissionGroupInfo group = mPermGroups.get(groupName);if (group == null) {PermissionGroupInfo grp = null;if (origGroupName != null) {grp = mPm.getPermissionGroupInfo(origGroupName, 0);}if (grp != null) {group = new MyPermissionGroupInfo(grp);} else {// We could be here either because the permission// didn't originally specify a group or the group it// gave couldn't be found.  In either case, we consider// its group to be the permission's package name.tmpPermInfo.group = tmpPermInfo.packageName;group = mPermGroups.get(tmpPermInfo.group);if (group == null) {group = new MyPermissionGroupInfo(tmpPermInfo);}group = new MyPermissionGroupInfo(tmpPermInfo);}mPermGroups.put(tmpPermInfo.group, group);}final boolean newPerm = installedPkgInfo != null&& (existingFlags&PackageInfo.REQUESTED_PERMISSION_GRANTED) == 0;MyPermissionInfo myPerm = new MyPermissionInfo(tmpPermInfo);myPerm.mNewReqFlags = flagsList[i];myPerm.mExistingReqFlags = existingFlags;// This is a new permission if the app is already installed and// doesn't currently hold this permission.myPerm.mNew = newPerm;permSet.add(myPerm);//权限添加到permSet中} catch (NameNotFoundException e) {Log.i(TAG, "Ignoring unknown permission:"+permName);}}}

第三个参数意思是查看下这个包以前是否安装过，对于安装过的程序，在展示权限信息的时候，会只展示这个新包要求的新的权限，相对于的原有的上一个版本已经出现过的就不再做展示啦。

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