Android 12 新功能分析
https://developer.android.com/about/versions/12/features
https://blog.csdn.net/weixin_40611659/article/details/119645712
关于存储：
/**
* Allow apps to create the requests to manage the media files without user confirmation.
*
* @see android.Manifest.permission#MANAGE_MEDIA
* @see android.provider.MediaStore#createDeleteRequest(ContentResolver, Collection)
* @see android.provider.MediaStore#createTrashRequest(ContentResolver, Collection, boolean)
* @see android.provider.MediaStore#createWriteRequest(ContentResolver, Collection)
*
* @hide
*/
https://juejin.cn/post/6932363591689437192
关于项目中的适配
android 12 适配 (kdocs.cn)
apk的大体流程如下：
· 第一步：拷贝文件到指定的目录： 在Android系统中，apk安装文件是会被保存起来的，默认情况下，用户安装的apk首先会被拷贝到/data/app目录下，/data/app目录是用户有权限访问的目录，在安装apk的时候会自动选择该目录存放用户安装的文件，而系统出场的apk文件则被放到了/system分区下，包括/system/app，/system/vendor/app，以及/system/priv-app等等，该分区只有ROOT权限的用户才能访问，这也就是为什么在没有Root手机之前，我们没法删除系统出场的app的原因了。
· 第二步：解压缩apk，宝贝文件，创建应用的数据目录 为了加快app的启动速度，apk在安装的时候，会首先将app的可执行文件dex拷贝到/data/dalvik-cache目录，缓存起来。然后，在/data/data/目录下创建应用程序的数据目录(以应用的包名命名)，存放在应用的相关数据，如数据库、xml文件、cache、二进制的so动态库等。
· 第三步：解析apk的AndroidManifest.xml文件
Android系统中，也有一个类似注册表的东西，用来记录当前所有安装的应用的基本信息，每次系统安装或者卸载了任何apk文件，都会更新这个文件。这个文件位于如下目录：/data/system/packages.xml。系统在安装这个apk的过程中，会解析apk的AndroidManifest.xml文件，提取出这个apk的重要信息写入到packages.xml文件中，这些信息包括：权限、应用包名、APK的安装位置、版本、userID等等。由此，我们就知道了为什么一些应用市场和软件管理类的app能够很清楚地知道当前手机所安装的所有app，以及这些app的详细信息了。另外一件事就是Linux的用户Id和用户组Id，以便他们可以获得合适的运行权限。以上都是由PackageServcieManager完成的，后面我们会重点介绍PackageServiceManager。
第四步：显示快捷方式 如果这些应用程序在PackageManagerService服务注册好了，如果我们想要在Android桌米上看到这些应用程序，还需要有一个Home应用程序，负责从PackageManagerService服务中把这些安装好的应用程序取出来，并以友好的方式在桌面上展现出来，例如以快捷图标的形式。在Android系统中，负责把系统中已经安装的应用程序在桌面中展现出来的Home应用就是Launcher了。
安装 APK 主要分为以下三种场景
- 安装系统应用：系统启动后调用 PackageManagerService.main() 初始化注册解析安装工作
public static PackageManagerService main(Context context, Installer installer,
boolean factoryTest, boolean onlyCore) {
// Self-check for initial settings.
PackageManagerServiceCompilerMapping.checkProperties();
PackageManagerService m = new PackageManagerService(context, installer,
factoryTest, onlyCore);
m.enableSystemUserPackages();
ServiceManager.addService("package", m);
final PackageManagerNative pmn = m.new PackageManagerNative();
ServiceManager.addService("package_native", pmn);
return m;
}
- 通过 adb 安装：通过 pm 参数，调用 PM 的 runInstall 方法，进入 PackageManagerService 安装安装工作
- 通过系统安装器 PackageInstaller 进行安装：先调用 InstallStart 进行权限检查之后启动 PackageInstallActivity，调用 PackageInstallActivity 的 startInstall 方法，点击 OK 按钮后进入 PackageManagerService 完成拷贝解析安装工作
所有安装方式大致相同，最终就是回到 PackageManagerService 中，安装一个 APK 的大致流程如下：
- 拷贝到 APK 文件到指定目录
- 解压缩 APK，拷贝文件，创建应用的数据目录
- 解析 APK 的 AndroidManifest.xml 文件
- 向 Launcher 应用申请添加创建快捷方式
本文主要来分析通过安装器 PackageInstaller 安装 APK，这是用户最常用的一种方式
7.0以前安装的入口是PackageInstallerActivity 7.0以后是InstallStart
3.1 InstallStart
主要工作：
判断是否勾选“未知来源”选项，若未勾选跳转到设置安装未知来源界面
对于大于等于 Android 8.0 版本，会先检查是否申请安装权限，若没有则中断安装
判断 Uri 的 Scheme 协议，若是 content 则调用 InstallStaging, 若是 package 则调用 PackageInstallerActivity,但是实际上 installStaging中的 StagingAsyncTask 会将content协议的Uri转换为File协议，然后跳转到PackageInstallerActivity，所以最终安装的开始还是PackageInstallerActivity
3.2 PackageInstallerActivity
主要工作：
- 显示安装界面
- 初始化安装需要用的各种对象，比如 PackageManager、IPackageManager、AppOpsManager、UserManager、PackageInstaller 等等
- 根据传递过来的 Scheme 协议做不同的处理
- 检查是否允许、初始化安装
- 在准备安装的之前，检查应用列表判断该应用是否已安装，若已安装则提示该应用已安装，由用户决定是否替换
- 在安装界面，提取出 APK 中权限信息并展示出来
- 点击 OK 按钮确认安装后，会调用 startInstall 开始安装工作
protected void onCreate(Bundle icicle) {
getWindow().addSystemFlags(SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS);
super.onCreate(null);
// 初始化安装需要用到的对象
mPm = getPackageManager();
mIpm = AppGlobals.getPackageManager();
mAppOpsManager = (AppOpsManager) getSystemService(Context.APP_OPS_SERVICE);
mInstaller = mPm.getPackageInstaller();
mUserManager = (UserManager) getSystemService(Context.USER_SERVICE);
// 根据Uri的Scheme做不同的处理
boolean wasSetUp = processPackageUri(packageUri);
if (!wasSetUp) {
return;
}
// 显示安装界面
bindUi();
// 检查是否允许安装包，如果允许则启动安装。如果不允许显示适当的对话框
checkIfAllowedAndInitiateInstall();
}
主要做了对象的初始化，解析 Uri 的 Scheme，初始化界面，安装包检查等等工作，接着查看一下
processPackageUri 方法
private boolean processPackageUri(final Uri packageUri) {
mPackageURI = packageUri;
final String scheme = packageUri.getScheme();
// 根据这个Scheme协议分别对package协议和file协议进行处理
switch (scheme) {
case SCHEME_PACKAGE: {
try {
// 通过PackageManager对象获取指定包名的包信息
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: {
// 根据packageUri创建一个新的File
File sourceFile = new File(packageUri.getPath());
// 解析APK得到APK的信息，PackageParser.Package存储了APK的所有信息
PackageParser.Package parsed = PackageUtil.getPackageInfo(this, sourceFile);
if (parsed == null) {
Log.w(TAG, "Parse error when parsing manifest. Discontinuing installation");
showDialogInner(DLG_PACKAGE_ERROR);
setPmResult(PackageManager.INSTALL_FAILED_INVALID_APK);
return false;
}
// 根据PackageParser.Package得到的APK信息，生成PackageInfo
mPkgInfo = PackageParser.generatePackageInfo(parsed, null,
PackageManager.GET_PERMISSIONS, 0, 0, null,
new PackageUserState());
mAppSnippet = PackageUtil.getAppSnippet(this, mPkgInfo.applicationInfo, sourceFile);
} break;
default: {
throw new IllegalArgumentException("Unexpected URI scheme " + packageUri);
}
}
return true;
}
主要对 Scheme 协议分别对 package 协议和 file 协议进行处理
SCHEME_PACKAGE：
在 package 协议中调用了 PackageManager.getPackageInfo 方法生成 PackageInfo，PackageInfo 是跨进程传递的包数据（activities、receivers、services、providers、permissions等等）包含 APK 的所有信息
SCHEME_FILE：
在 file 协议的处理中调用了 PackageUtil.getPackageInfo 方法，方法内部调用了 PackageParser.parsePackage() 把 APK 文件的 manifest 和签名信息都解析完成并保存在了 Package，Package 包含了该 APK 的所有信息
调用 PackageParser.generatePackageInfo 生成 PackageInfo
接着往下走，都解析完成之后，回到 onCreate 方法，继续调用 checkIfAllowedAndInitiateInstall 方法
private void checkIfAllowedAndInitiateInstall() {
## 首先检查安装应用程序的用户限制，如果有限制并弹出弹出提示Dialog或者跳转到设置界面
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));
finish();
return;
}
// 判断如果允许安装未知来源或者根据Intent判断得出该APK不是未知来源
if (mAllowUnknownSources || !isInstallRequestFromUnknownSource(getIntent())) {
initiateInstall();
} else {
// 检查未知安装源限制,如果有限制弹出Dialog,显示相应的信息
final int unknownSourcesRestrictionSource = mUserManager.getUserRestrictionSource(
UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES, Process.myUserHandle());
final int unknownSourcesGlobalRestrictionSource = mUserManager.getUserRestrictionSource(
UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES_GLOBALLY, Process.myUserHandle());
final int systemRestriction = UserManager.RESTRICTION_SOURCE_SYSTEM
& (unknownSourcesRestrictionSource | unknownSourcesGlobalRestrictionSource);
if (systemRestriction != 0) {
showDialogInner(DLG_UNKNOWN_SOURCES_RESTRICTED_FOR_USER);
} else if (unknownSourcesRestrictionSource != UserManager.RESTRICTION_NOT_SET) {
startAdminSupportDetailsActivity(UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES);
} else if (unknownSourcesGlobalRestrictionSource != UserManager.RESTRICTION_NOT_SET) {
startAdminSupportDetailsActivity(
UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES_GLOBALLY);
} else {
// 处理未知来源的APK
handleUnknownSources();
}
}
}
主要检查安装应用程序的用户限制，当 APK 文件不对或者安装有限制则调用 showDialogInner 方法，弹出 dialog 提示用户，显示相应的错误信息，来看一下都有那些错误信息
// Dialog identifiers used in showDialog
private static final int DLG_BASE = 0;
// package信息错误
private static final int DLG_PACKAGE_ERROR = DLG_BASE + 2;
// 存储空间不够
private static final int DLG_OUT_OF_SPACE = DLG_BASE + 3;
// 安装错误
private static final int DLG_INSTALL_ERROR = DLG_BASE + 4;
// 用户限制的未知来源
private static final int DLG_UNKNOWN_SOURCES_RESTRICTED_FOR_USER = DLG_BASE + 5;
private static final int DLG_ANONYMOUS_SOURCE = DLG_BASE + 6;
// 在wear上不支持
private static final int DLG_NOT_SUPPORTED_ON_WEAR = DLG_BASE + 7;
private static final int DLG_EXTERNAL_SOURCE_BLOCKED = DLG_BASE + 8;
// 安装限制用户使用的应用程序
private static final int DLG_INSTALL_APPS_RESTRICTED_FOR_USER = DLG_BASE + 9;
如果用户允许安装未知来源，会调用 initiateInstall 方法
private void initiateInstall() {
String pkgName = mPkgInfo.packageName;
// 检查设备上是否存在相同包名的APK
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;
}
// 检查package是否已安装, 如果已经安装则显示对话框提示用户是否替换。
try {
mAppInfo = mPm.getApplicationInfo(pkgName,
PackageManager.MATCH_UNINSTALLED_PACKAGES);
if ((mAppInfo.flags&ApplicationInfo.FLAG_INSTALLED) == 0) {
mAppInfo = null;
}
} catch (NameNotFoundException e) {
mAppInfo = null;
}
// 初始化确认安装界面
startInstallConfirm();
}
根据包名获取应用程序的信息，调用 startInstallConfirm 方法初始化安装确认界面后，当用户点击确认按钮之后发生了什么，接着查看确认按钮点击事件
private void bindUi() {
...
// 点击确认按钮，安装APK
mAlert.setButton(DialogInterface.BUTTON_POSITIVE, getString(R.string.install),
(ignored, ignored2) -> {
if (mOk.isEnabled()) {
if (mSessionId != -1) {
mInstaller.setPermissionsResult(mSessionId, true);
finish();
} else {
// 启动Activity来完成应用的安装
startInstall();
}
}
}, null);
// 点击取消按钮，取消此次安装
mAlert.setButton(DialogInterface.BUTTON_NEGATIVE, getString(R.string.cancel),
(ignored, ignored2) -> {
// Cancel and finish
setResult(RESULT_CANCELED);
if (mSessionId != -1) {
mInstaller.setPermissionsResult(mSessionId, false);
}
finish();
}, null);
setupAlert();
mOk = mAlert.getButton(DialogInterface.BUTTON_POSITIVE);
mOk.setEnabled(false);
}
当用户点击确认按钮调用了 startInstall 方法，启动子 Activity 完成 APK 的安装
private void startInstall() {
// 启动子Activity来完成应用的安
Intent newIntent = new Intent();
newIntent.putExtra(PackageUtil.INTENT_ATTR_APPLICATION_INFO,
mPkgInfo.applicationInfo);
newIntent.setData(mPackageURI);
newIntent.setClass(this, InstallInstalling.class);
...
if(localLOGV) Log.i(TAG, "downloaded app uri="+mPackageURI);
startActivity(newIntent);
finish();
}
startInstall 方法用来跳转到 InstallInstalling，并关闭掉当前的 PackageInstallerActivity
3.3 InstallInstalling
主要工作：
向包管理器发送包的信息，然后等待包管理器处理结果
注册一个观察者 InstallEventReceiver，并接受安装成功和失败的回调
在方法 onResume 中创建同步栈，打开安装 session，设置安装进度条
InstallInstalling 首先向包管理器发送包的信息，然后等待包管理器处理结果，并在方法 InstallSuccess 和方法 InstallFailed 进行成功和失败的处理，查看 InstallInstalling 的 onCreate 方法：
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
// 判断安装的应用是否已经存在
if ("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.AppSnippet as = PackageUtil.getAppSnippet(this, appInfo, sourceFile);
...
if (savedInstanceState != null) {
// 如果savedInstanceState 不为空，获取已经存在mSessionId 和mInstallId 重新注册
mSessionId = savedInstanceState.getInt(SESSION_ID);
mInstallId = savedInstanceState.getInt(INSTALL_ID);
try {
// 根据mInstallId向InstallEventReceiver注册一个观察者，launchFinishBasedOnResult会接收到安装事件的回调
InstallEventReceiver.addObserver(this, mInstallId,
this::launchFinishBasedOnResult);
} catch (EventResultPersister.OutOfIdsException e) {
}
} else {
// 如果为空创建SessionParams，代表安装会话的参数
// 解析APK, 并将解析的参数赋值给SessionParams
PackageInstaller.SessionParams params = new PackageInstaller.SessionParams(
PackageInstaller.SessionParams.MODE_FULL_INSTALL);
...
try {
// 注册InstallEventReceiver，并在launchFinishBasedOnResult会接收到安装事件的回调
mInstallId = InstallEventReceiver
.addObserver(this, EventResultPersister.GENERATE_NEW_ID,
this::launchFinishBasedOnResult);
} catch (EventResultPersister.OutOfIdsException e) {
launchFailure(PackageManager.INSTALL_FAILED_INTERNAL_ERROR, null);
}
try {
// createSession 内部通过IPackageInstaller与PackageInstallerService进行进程间通信，
// 最终调用的是PackageInstallerService的createSession方法来创建并返回mSessionId
mSessionId = getPackageManager().getPackageInstaller().createSession(params);
} catch (IOException e) {
launchFailure(PackageManager.INSTALL_FAILED_INTERNAL_ERROR, null);
}
}
...
}
}
最终都会注册一个观察者 InstallEventReceiver，并在 launchFinishBasedOnResult 会接收到安装事件的回调，其中 InstallEventReceiver 继承自 BroadcastReceiver，用于接收安装事件并回调给 EventResultPersister
createSession 内部通过 IPackageInstaller 与 PackageInstallerService 进行进程间通信，最终调用的是 PackageInstallerService的createSession 方法来创建并返回 mSessionId
接下来在 onResume 方法创建 InstallingAsyncTask 用来执行 APK 的安装，接着查看 onResume 方法
protected void onResume() {
super.onResume();
if (mInstallingTask == null) {
PackageInstaller installer = getPackageManager().getPackageInstaller();
// 根据mSessionId 获取SessionInfo, 代表安装会话的详细信息
PackageInstaller.SessionInfo sessionInfo = installer.getSessionInfo(mSessionId);
if (sessionInfo != null && !sessionInfo.isActive()) {
mInstallingTask = new InstallingAsyncTask();
mInstallingTask.execute();
} else {
// 安装完成后会收到广播
mCancelButton.setEnabled(false);
setFinishOnTouchOutside(false);
}
}
}
得到 SessionInfo 创建并创建 InstallingAsyncTask，InstallingAsyncTask 的 doInBackground 方法设置安装进度条，并将 APK 信息写入 PackageInstaller.Session，写入完成之后，在 InstallingAsyncTask 的 onPostExecute 进行成功与失败的处理，接着查看 onPostExecute 方法
protected void onPostExecute(PackageInstaller.Session session) {
if (session != null) {
Intent broadcastIntent = new Intent(BROADCAST_ACTION);
broadcastIntent.setFlags(Intent.FLAG_RECEIVER_FOREGROUND);
broadcastIntent.setPackage(getPackageName());
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);
}
}
}
创建了 broadcastIntent，并通过 PackageInstaller.Session 的 commit 方法发送出去，通过 broadcastIntent 构造方法指定的 Intent 的 Action 为 BROADCAST_ACTION，而 BROADCAST_ACTION 是一个常量值
private static final String BROADCAST_ACTION =
"com.android.packageinstaller.ACTION_INSTALL_COMMIT";
回到 InstallInstalling.OnCreate 方法，在 OnCreate 方法注册 InstallEventReceiver，而 InstallEventReceiver 继承自 BroadcastReceiver，而使用 BroadcastReceiver 需要在 AndroidManifest.xml注册，接着查看 AndroidManifest.xml：
/frameworks/base/packages/PackageInstaller/AndroidManifest.xml
<receiver android:name=".InstallEventReceiver"
android:permission="android.permission.INSTALL_PACKAGES"
android:exported="true">
<intent-filter android:priority="1">
<action android:name="com.android.packageinstaller.ACTION_INSTALL_COMMIT" />
</intent-filter>
</receiver>
安装结束之后，会在观察者 InstallEventReceiver 注册的回调方法 launchFinishBasedOnResult 处理安装事件的结果，接着查看 launchFinishBasedOnResult
private void launchFinishBasedOnResult(int statusCode, int legacyStatus, String statusMessage) {
if (statusCode == PackageInstaller.STATUS_SUCCESS) {
launchSuccess();
} else {
launchFailure(legacyStatus, statusMessage);
}
}
private void launchSuccess() {
Intent successIntent = new Intent(getIntent());
successIntent.setClass(this, InstallSuccess.class);
successIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
startActivity(successIntent);
finish();
}
private void launchFailure(int legacyStatus, String statusMessage) {
Intent failureIntent = new Intent(getIntent());
failureIntent.setClass(this, InstallFailed.class);
failureIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
failureIntent.putExtra(PackageInstaller.EXTRA_LEGACY_STATUS, legacyStatus);
failureIntent.putExtra(PackageInstaller.EXTRA_STATUS_MESSAGE, statusMessage);
startActivity(failureIntent);
finish();
}
安装成功和失败，都会启动一个新的 Activity（InstallSuccess、InstallFailed）将结果展示给用户，然后 finish 掉 InstallInstalling
总结一下 PackageInstaller 安装APK的过程：
现在来总结下PackageInstaller初始化的过程：
根据Uri的Scheme协议不同，跳转到不同的界面，content协议跳转到InstallStart，其他的跳转到PackageInstallerActivity。本文应用场景中，如果是Android7.0以及更高版本会跳转到InstallStart。
InstallStart将content协议的Uri转换为File协议，然后跳转到PackageInstallerActivity。
PackageInstallerActivity会分别对package协议和file协议的Uri进行处理，如果是file协议会解析APK文件得到包信息PackageInfo。
点击 OK 按钮确认安装后，会调用 startInstall 开始安装工作
如果用户允许安装，然后跳转到 InstallInstalling，进行 APK 的安装工作
在 InstallInstalling 中，向包管理器发送包的信息，然后注册一个观察者 InstallEventReceiver，并接受安装成功和失败的回调
PackageInstallSession
Android通过PackageInstallerSession来表示一次安装过程，一个PackageInstallerSession包含一个系统中唯一的一个SessionId，如果一个应用的安装必须分几个阶段来完成，即使设备重启了，也可以通过这个ID来继续安装过程
PackageInstallerService
安装的远程服务类，用于返回sessionid
@Override
public void commit(@NonNull IntentSender statusReceiver, boolean forTransfer) {
if (hasParentSessionId()) {
throw new IllegalStateException(
"Session " + sessionId + " is a child of multi-package session "
+ getParentSessionId() + " and may not be committed directly.");
}
if (!markAsSealed(statusReceiver, forTransfer)) {
return;
}
if (isMultiPackage()) {
synchronized (mLock) {
final IntentSender childIntentSender =
new ChildStatusIntentReceiver(mChildSessions.clone(), statusReceiver)
.getIntentSender();
boolean sealFailed = false;
for (int i = mChildSessions.size() - 1; i >= 0; --i) {
// seal all children, regardless if any of them fail; we'll throw/return
// as appropriate once all children have been processed
if (!mChildSessions.valueAt(i)
.markAsSealed(childIntentSender, forTransfer)) {
sealFailed = true;
}
}
if (sealFailed) {
return;
}
}
}
dispatchSessionSealed();
}
/**
* Kicks off the install flow. The first step is to persist 'sealed' flags
* to prevent mutations of hard links created later.
*/
private void dispatchSessionSealed() {
mHandler.obtainMessage(MSG_ON_SESSION_SEALED).sendToTarget();
}
private final Handler.Callback mHandlerCallback = new Handler.Callback() {
@Override
public boolean handleMessage(Message msg) {
switch (msg.what) {
case MSG_ON_SESSION_SEALED:
handleSessionSealed();
break;
case MSG_STREAM_VALIDATE_AND_COMMIT:
handleStreamValidateAndCommit();
break;
case MSG_INSTALL:
handleInstall();
break;
case MSG_ON_PACKAGE_INSTALLED:
final SomeArgs args = (SomeArgs) msg.obj;
final String packageName = (String) args.arg1;
final String message = (String) args.arg2;
final Bundle extras = (Bundle) args.arg3;
final IntentSender statusReceiver = (IntentSender) args.arg4;
final int returnCode = args.argi1;
args.recycle();
sendOnPackageInstalled(mContext, statusReceiver, sessionId,
isInstallerDeviceOwnerOrAffiliatedProfileOwner(), userId,
packageName, returnCode, message, extras);
break;
case MSG_SESSION_VALIDATION_FAILURE:
final int error = msg.arg1;
final String detailMessage = (String) msg.obj;
onSessionValidationFailure(error, detailMessage);
break;
}
return true;
}
};
经过一系列处理最终是调用的还是Pms中的安装方法
private void installNonStaged()
throws PackageManagerException {
final PackageManagerService.InstallParams installingSession = makeInstallParams();
if (installingSession == null) {
throw new PackageManagerException(INSTALL_FAILED_INTERNAL_ERROR,
"Session should contain at least one apk session for installation");
}
if (isMultiPackage()) {
final List<PackageInstallerSession> childSessions;
synchronized (mLock) {
childSessions = getChildSessionsLocked();
}
List<PackageManagerService.InstallParams> installingChildSessions =
new ArrayList<>(childSessions.size());
boolean success = true;
PackageManagerException failure = null;
for (int i = 0; i < childSessions.size(); ++i) {
final PackageInstallerSession session = childSessions.get(i);
try {
final PackageManagerService.InstallParams installingChildSession =
session.makeInstallParams();
if (installingChildSession != null) {
installingChildSessions.add(installingChildSession);
}
} catch (PackageManagerException e) {
failure = e;
success = false;
}
}
if (!success) {
final IntentSender statusReceiver;
synchronized (mLock) {
statusReceiver = mRemoteStatusReceiver;
}
sendOnPackageInstalled(mContext, statusReceiver, sessionId,
isInstallerDeviceOwnerOrAffiliatedProfileOwner(), userId, null,
failure.error, failure.getLocalizedMessage(), null);
return;
}
mPm.installStage(installingSession, installingChildSessions);
} else {
mPm.installStage(installingSession);
}
}
packageManagerService
final void startCopy() {
if (DEBUG_INSTALL) Slog.i(TAG, "startCopy " + mUser + ": " + this);
handleStartCopy();
handleReturnCode();
}
@Override
void handleReturnCode() {
processPendingInstall();
}
private void processPendingInstall() {
InstallArgs args = createInstallArgs(this);
if (mRet == PackageManager.INSTALL_SUCCEEDED) {
mRet = args.copyApk();
}
if (mRet == PackageManager.INSTALL_SUCCEEDED) {
F2fsUtils.releaseCompressedBlocks(
mContext.getContentResolver(), new File(args.getCodePath()));
}
if (mParentInstallParams != null) {
mParentInstallParams.tryProcessInstallRequest(args, mRet);
} else {
PackageInstalledInfo res = createPackageInstalledInfo(mRet);
processInstallRequestsAsync(
res.returnCode == PackageManager.INSTALL_SUCCEEDED,
Collections.singletonList(new InstallRequest(args, res)));
}
}
// Queue up an async operation since the package installation may take a little while.
private void processInstallRequestsAsync(boolean success,
List<InstallRequest> installRequests) {
mHandler.post(() -> {
List<InstallRequest> apexInstallRequests = new ArrayList<>();
List<InstallRequest> apkInstallRequests = new ArrayList<>();
for (InstallRequest request : installRequests) {
if ((request.args.installFlags & PackageManager.INSTALL_APEX) != 0) {
apexInstallRequests.add(request);
} else {
apkInstallRequests.add(request);
}
}
// Note: supporting multi package install of both APEXes and APKs might requir some
// thinking to ensure atomicity of the install.
if (!apexInstallRequests.isEmpty() && !apkInstallRequests.isEmpty()) {
// This should've been caught at the validation step, but for some reason wasn't.
throw new IllegalStateException(
"Attempted to do a multi package install of both APEXes and APKs");
}
if (!apexInstallRequests.isEmpty()) {
if (success) {
// Since installApexPackages requires talking to external service (apexd), we
// schedule to run it async. Once it finishes, it will resume the install.
Thread t = new Thread(() -> installApexPackagesTraced(apexInstallRequests),
"installApexPackages");
t.start();
} else {
// Non-staged APEX installation failed somewhere before
// processInstallRequestAsync. In that case just notify the observer about the
// failure.
InstallRequest request = apexInstallRequests.get(0);
notifyInstallObserver(request.installResult, request.args.observer);
}
return;
}
if (success) {
for (InstallRequest request : apkInstallRequests) {
request.args.doPreInstall(request.installResult.returnCode);
}
synchronized (mInstallLock) {
installPackagesTracedLI(apkInstallRequests);
}
for (InstallRequest request : apkInstallRequests) {
request.args.doPostInstall(
request.installResult.returnCode, request.installResult.uid);
}
}
for (InstallRequest request : apkInstallRequests) {
restoreAndPostInstall(request.args.user.getIdentifier(), request.installResult,
new PostInstallData(request.args, request.installResult, null));
}
});
}
if (!doRestore) {
// No restore possible, or the Backup Manager was mysteriously not
// available -- just fire the post-install work request directly.
if (DEBUG_INSTALL) Log.v(TAG, "No restore - queue post-install for " + token);
Trace.asyncTraceBegin(TRACE_TAG_PACKAGE_MANAGER, "postInstall", token);
Message msg = mHandler.obtainMessage(POST_INSTALL, token, 0);
mHandler.sendMessage(msg);
}
case POST_INSTALL: {
if (DEBUG_INSTALL) Log.v(TAG, "Handling post-install for " + msg.arg1);
PostInstallData data = mRunningInstalls.get(msg.arg1);
final boolean didRestore = (msg.arg2 != 0);
mRunningInstalls.delete(msg.arg1);
if (data != null && data.res.freezer != null) {
data.res.freezer.close();
}
if (data != null && data.mPostInstallRunnable != null) {
data.mPostInstallRunnable.run();
} else if (data != null && data.args != null) {
InstallArgs args = data.args;
PackageInstalledInfo parentRes = data.res;
final boolean killApp = (args.installFlags
& PackageManager.INSTALL_DONT_KILL_APP) == 0;
final boolean virtualPreload = ((args.installFlags
& PackageManager.INSTALL_VIRTUAL_PRELOAD) != 0);
handlePackagePostInstall(parentRes, killApp, virtualPreload,
didRestore, args.installSource.installerPackageName, args.observer,
args.mDataLoaderType);
https://www.edrawmax.cn/online/share.html?code=98e50f7242b611ec802fefb61da1a18d
Android 12 针对使用 PackageInstaller API 的应用引入了 setRequireUserAction() 方法。此方法可让安装程序应用执行应用更新而无需用户确认操作。
@UserActionRequirement
private int computeUserActionRequirement() {
final String packageName;
synchronized (mLock) {
if (mPermissionsManuallyAccepted) {
return USER_ACTION_NOT_NEEDED;
}
packageName = mPackageName;
}
final boolean forcePermissionPrompt =
(params.installFlags & PackageManager.INSTALL_FORCE_PERMISSION_PROMPT) != 0
|| params.requireUserAction == SessionParams.USER_ACTION_REQUIRED;
if (forcePermissionPrompt) {
return USER_ACTION_REQUIRED;
}
// It is safe to access mInstallerUid and mInstallSource without lock
// because they are immutable after sealing.
final boolean isInstallPermissionGranted =
(mPm.checkUidPermission(android.Manifest.permission.INSTALL_PACKAGES,
mInstallerUid) == PackageManager.PERMISSION_GRANTED);
final boolean isSelfUpdatePermissionGranted =
(mPm.checkUidPermission(android.Manifest.permission.INSTALL_SELF_UPDATES,
mInstallerUid) == PackageManager.PERMISSION_GRANTED);
final boolean isUpdatePermissionGranted =
(mPm.checkUidPermission(android.Manifest.permission.INSTALL_PACKAGE_UPDATES,
mInstallerUid) == PackageManager.PERMISSION_GRANTED);
final boolean isUpdateWithoutUserActionPermissionGranted = (mPm.checkUidPermission(
android.Manifest.permission.UPDATE_PACKAGES_WITHOUT_USER_ACTION, mInstallerUid)
== PackageManager.PERMISSION_GRANTED);
final int targetPackageUid = mPm.getPackageUid(packageName, 0, userId);
final boolean isUpdate = targetPackageUid != -1 || isApexSession();
final InstallSourceInfo existingInstallSourceInfo = isUpdate
? mPm.getInstallSourceInfo(packageName)
: null;
final String existingInstallerPackageName = existingInstallSourceInfo != null
? existingInstallSourceInfo.getInstallingPackageName()
: null;
final boolean isInstallerOfRecord = isUpdate
&& Objects.equals(existingInstallerPackageName, getInstallerPackageName());
final boolean isSelfUpdate = targetPackageUid == mInstallerUid;
final boolean isPermissionGranted = isInstallPermissionGranted
|| (isUpdatePermissionGranted && isUpdate)
|| (isSelfUpdatePermissionGranted && isSelfUpdate);
final boolean isInstallerRoot = (mInstallerUid == Process.ROOT_UID);
final boolean isInstallerSystem = (mInstallerUid == Process.SYSTEM_UID);
// Device owners and affiliated profile owners are allowed to silently install packages, so
// the permission check is waived if the installer is the device owner.
final boolean noUserActionNecessary = isPermissionGranted || isInstallerRoot
|| isInstallerSystem || isInstallerDeviceOwnerOrAffiliatedProfileOwner();
if (noUserActionNecessary) {
return USER_ACTION_NOT_NEEDED;
}
if (mPm.isInstallDisabledForPackage(getInstallerPackageName(), mInstallerUid, userId)) {
// show the installer to account for device poslicy or unknown sources use cases
return USER_ACTION_REQUIRED;
}
if (params.requireUserAction == SessionParams.USER_ACTION_NOT_REQUIRED
&& isUpdateWithoutUserActionPermissionGranted
&& (isInstallerOfRecord || isSelfUpdate)) {
return USER_ACTION_PENDING_APK_PARSING;
}
return USER_ACTION_REQUIRED;
}
private PackageManagerService.VerificationParams prepareForVerification()
throws PackageManagerException {
assertNotLocked("makeSessionActive");
@UserActionRequirement
int userActionRequirement = USER_ACTION_NOT_NEEDED;
// TODO(b/159331446): Move this to makeSessionActiveForInstall and update javadoc
if (!params.isMultiPackage) {
userActionRequirement = computeUserActionRequirement();
if (userActionRequirement == USER_ACTION_REQUIRED) {
sendPendingUserActionIntent();
return null;
} // else, we'll wait until we parse to determine if we need to
}
boolean silentUpdatePolicyEnforceable = false;
synchronized (mLock) {
if (mRelinquished) {
throw new PackageManagerException(INSTALL_FAILED_INTERNAL_ERROR,
"Session relinquished");
}
if (mDestroyed) {
throw new PackageManagerException(INSTALL_FAILED_INTERNAL_ERROR,
"Session destroyed");
}
if (!mSealed) {
throw new PackageManagerException(INSTALL_FAILED_INTERNAL_ERROR,
"Session not sealed");
}
PackageLite result = parseApkLite();
if (result != null) {
mPackageLite = result;
synchronized (mProgressLock) {
mInternalProgress = 0.5f;
computeProgressLocked(true);
}
extractNativeLibraries(
mPackageLite, stageDir, params.abiOverride, mayInheritNativeLibs());
1 安装程序声明了 UPDATE_PACKAGES_WITHOUT_USER_ACTION 权限。
2 正在安装的应用程序的目标是 API 级别 29（Android 10）或更高
if (userActionRequirement == USER_ACTION_PENDING_APK_PARSING) {
if (result.getTargetSdk() < Build.VERSION_CODES.Q) {
sendPendingUserActionIntent();
return null;
}
3 安装器选择了新的行为 不需要操作的行为
if (params.requireUserAction == SessionParams.USER_ACTION_NOT_REQUIRED) {
silentUpdatePolicyEnforceable = true;
}
}
}
}
if (silentUpdatePolicyEnforceable) {
if (!mSilentUpdatePolicy.isSilentUpdateAllowed(
getInstallerPackageName(), getPackageName())) {
// Fall back to the non-silent update if a repeated installation is invoked within
// the throttle time.
sendPendingUserActionIntent();
return null;
}
记录静默更新程序
mSilentUpdatePolicy.track(getInstallerPackageName(), getPackageName());
}
synchronized (mLock) {
return makeVerificationParamsLocked();
}
}
private PackageManagerService.VerificationParams makeVerificationParamsLocked() {
final IPackageInstallObserver2 localObserver;
if (!hasParentSessionId()) {
// Avoid attaching this observer to child session since they won't use it.
localObserver = new IPackageInstallObserver2.Stub() {
@Override
public void onUserActionRequired(Intent intent) {
throw new IllegalStateException();
}
@Override
public void onPackageInstalled(String basePackageName, int returnCode, String msg,
Bundle extras) {
if (returnCode == INSTALL_SUCCEEDED) {
onVerificationComplete();
} else {
onSessionVerificationFailure(returnCode, msg);
}
}
};
} else {
localObserver = null;
}
private void onVerificationComplete() {
// Staged sessions will be installed later during boot
if (isStaged()) {
// TODO(b/136257624): Remove this once all verification logic has been transferred out
// of StagingManager.
mStagingManager.notifyPreRebootVerification_Apk_Complete(mStagedSession);
// TODO(b/136257624): We also need to destroy internals for verified staged session,
// otherwise file descriptors are never closed for verified staged session until reboot
return;
}
install();
}
直接执行安装
