android Q版本START_ACTIVITIES_FROM

最近项目中遇到一个问题：一个客户应用从后台启动Activity，有如下打印

Slog.w(TAG, "Background activity start [callingPackage: " + callingPackage+ "; callingUid: " + callingUid+ "; isCallingUidForeground: " + isCallingUidForeground+ "; isCallingUidPersistentSystemProcess: " + isCallingUidPersistentSystemProcess+ "; realCallingUid: " + realCallingUid+ "; isRealCallingUidForeground: " + isRealCallingUidForeground+ "; isRealCallingUidPersistentSystemProcess: "+ isRealCallingUidPersistentSystemProcess+ "; originatingPendingIntent: " + originatingPendingIntent+ "; isBgStartWhitelisted: " + allowBackgroundActivityStart+ "; intent: " + intent+ "; callerApp: " + callerApp+ "]");

通过在源代码里面搜索，找到对应的文件是

frameworks/base/services/core/java/com/android/server/wm/ActivityStarter.java

在shouldAbortBackgroundActivityStart方法里面会判断是否拦截，方法如下：

   boolean shouldAbortBackgroundActivityStart(int callingUid, int callingPid,final String callingPackage, int realCallingUid, int realCallingPid,WindowProcessController callerApp, PendingIntentRecord originatingPendingIntent,boolean allowBackgroundActivityStart, Intent intent) {// don't abort for the most important UIDsfinal int callingAppId = UserHandle.getAppId(callingUid);if (callingUid == Process.ROOT_UID || callingAppId == Process.SYSTEM_UID|| callingAppId == Process.NFC_UID) {return false;}// don't abort if the callingUid has a visible window or is a persistent system processfinal int callingUidProcState = mService.getUidState(callingUid);final boolean callingUidHasAnyVisibleWindow =mService.mWindowManager.mRoot.isAnyNonToastWindowVisibleForUid(callingUid);final boolean isCallingUidForeground = callingUidHasAnyVisibleWindow|| callingUidProcState == ActivityManager.PROCESS_STATE_TOP|| callingUidProcState == ActivityManager.PROCESS_STATE_BOUND_TOP;final boolean isCallingUidPersistentSystemProcess =callingUidProcState <= ActivityManager.PROCESS_STATE_PERSISTENT_UI;if (callingUidHasAnyVisibleWindow || isCallingUidPersistentSystemProcess) {return false;}// take realCallingUid into considerationfinal int realCallingUidProcState = (callingUid == realCallingUid)? callingUidProcState: mService.getUidState(realCallingUid);final boolean realCallingUidHasAnyVisibleWindow = (callingUid == realCallingUid)? callingUidHasAnyVisibleWindow: mService.mWindowManager.mRoot.isAnyNonToastWindowVisibleForUid(realCallingUid);final boolean isRealCallingUidForeground = (callingUid == realCallingUid)? isCallingUidForeground: realCallingUidHasAnyVisibleWindow|| realCallingUidProcState == ActivityManager.PROCESS_STATE_TOP;final int realCallingAppId = UserHandle.getAppId(realCallingUid);final boolean isRealCallingUidPersistentSystemProcess = (callingUid == realCallingUid)? isCallingUidPersistentSystemProcess: (realCallingAppId == Process.SYSTEM_UID)|| realCallingUidProcState <= ActivityManager.PROCESS_STATE_PERSISTENT_UI;if (realCallingUid != callingUid) {// don't abort if the realCallingUid has a visible windowif (realCallingUidHasAnyVisibleWindow) {return false;}// if the realCallingUid is a persistent system process, abort if the IntentSender// wasn't whitelisted to start an activityif (isRealCallingUidPersistentSystemProcess && allowBackgroundActivityStart) {return false;}// don't abort if the realCallingUid is an associated companion appif (mService.isAssociatedCompanionApp(UserHandle.getUserId(realCallingUid),realCallingUid)) {return false;}}// don't abort if the callingUid has START_ACTIVITIES_FROM_BACKGROUND permissionif (mService.checkPermission(START_ACTIVITIES_FROM_BACKGROUND, callingPid, callingUid)== PERMISSION_GRANTED) {return false;}// don't abort if the caller has the same uid as the recents componentif (mSupervisor.mRecentTasks.isCallerRecents(callingUid)) {return false;}// don't abort if the callingUid is the device ownerif (mService.isDeviceOwner(callingUid)) {return false;}// don't abort if the callingUid has companion devicefinal int callingUserId = UserHandle.getUserId(callingUid);if (mService.isAssociatedCompanionApp(callingUserId, callingUid)) {return false;}// If we don't have callerApp at this point, no caller was provided to startActivity().// That's the case for PendingIntent-based starts, since the creator's process might not be// up and alive. If that's the case, we retrieve the WindowProcessController for the send()// caller, so that we can make the decision based on its foreground/whitelisted state.int callerAppUid = callingUid;if (callerApp == null) {callerApp = mService.getProcessController(realCallingPid, realCallingUid);callerAppUid = realCallingUid;}// don't abort if the callerApp or other processes of that uid are whitelisted in any wayif (callerApp != null) {// first check the original calling processif (callerApp.areBackgroundActivityStartsAllowed()) {return false;}// only if that one wasn't whitelisted, check the other onesfinal ArraySet<WindowProcessController> uidProcesses =mService.mProcessMap.getProcesses(callerAppUid);if (uidProcesses != null) {for (int i = uidProcesses.size() - 1; i >= 0; i--) {final WindowProcessController proc = uidProcesses.valueAt(i);if (proc != callerApp && proc.areBackgroundActivityStartsAllowed()) {return false;}}}}// don't abort if the callingUid has SYSTEM_ALERT_WINDOW permissionif (mService.hasSystemAlertWindowPermission(callingUid, callingPid, callingPackage)) {Slog.w(TAG, "Background activity start for " + callingPackage+ " allowed because SYSTEM_ALERT_WINDOW permission is granted.");return false;}// anything that has fallen through would currently be abortedSlog.w(TAG, "Background activity start [callingPackage: " + callingPackage+ "; callingUid: " + callingUid+ "; isCallingUidForeground: " + isCallingUidForeground+ "; isCallingUidPersistentSystemProcess: " + isCallingUidPersistentSystemProcess+ "; realCallingUid: " + realCallingUid+ "; isRealCallingUidForeground: " + isRealCallingUidForeground+ "; isRealCallingUidPersistentSystemProcess: "+ isRealCallingUidPersistentSystemProcess+ "; originatingPendingIntent: " + originatingPendingIntent+ "; isBgStartWhitelisted: " + allowBackgroundActivityStart+ "; intent: " + intent+ "; callerApp: " + callerApp+ "]");// log aborted activity start to TRONif (mService.isActivityStartsLoggingEnabled()) {mSupervisor.getActivityMetricsLogger().logAbortedBgActivityStart(intent, callerApp,callingUid, callingPackage, callingUidProcState, callingUidHasAnyVisibleWindow,realCallingUid, realCallingUidProcState, realCallingUidHasAnyVisibleWindow,(originatingPendingIntent != null));}return true;}

从此方法可以看出，有如下打印，就是此方法返回true,拦截启动

Slog.w(TAG, "Background activity start [callingPackage: " + callingPackage

查看官方文档，在android q版本上增加了对后台启动Activity的限制
https://developer.android.google.cn/guide/components/activities/background-starts

新增加了一个权限定义在

frameworks/base/core/res/AndroidManifest.xml

具体定义如下：

<permission android:name="android.permission.START_ACTIVITIES_FROM_BACKGROUND"android:protectionLevel="signature|privileged|vendorPrivileged|oem|verifier" />

应用预制在system/app下是不满足条件的，修改到system/priv-app/目录下，满足privileged这个条件，不会拦截

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android Q版本START_ACTIVITIES_FROM_BACKGROUND

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