Protect against assumptions of a top focused stack.
RootWindowContainer#getTopDisplayFocusedStack() has the potential to
return null when there are no focusable stacks. This guards against
many assumptions that a top focused stack exists.
Bug: 144085050
Bug: 148125390
Bug: 150754510
Fixes: 144085050
Test: ActivityStarterTests
Test: ActivityStackTests
Test: ActivityTaskManagerServiceTests
Test: RootWindowContainerTests
Change-Id: Ibefc3a802aba5a90898837359ec59a48f39834dc
diff --git a/services/core/java/com/android/server/wm/ActivityTaskManagerService.java b/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
index 770dabf..4688187 100644
--- a/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
+++ b/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
@@ -1104,8 +1104,8 @@
// If this is coming from the currently resumed activity, it is
// effectively saying that app switches are allowed at this point.
final ActivityStack stack = getTopDisplayFocusedStack();
- if (stack.mResumedActivity != null &&
- stack.mResumedActivity.info.applicationInfo.uid == Binder.getCallingUid()) {
+ if (stack != null && stack.mResumedActivity != null
+ && stack.mResumedActivity.info.applicationInfo.uid == Binder.getCallingUid()) {
mAppSwitchesAllowedTime = 0;
}
}
@@ -1951,8 +1951,13 @@
public boolean isTopActivityImmersive() {
enforceNotIsolatedCaller("isTopActivityImmersive");
synchronized (mGlobalLock) {
- final ActivityRecord r = getTopDisplayFocusedStack().topRunningActivity();
- return (r != null) ? r.immersive : false;
+ final ActivityStack topFocusedStack = getTopDisplayFocusedStack();
+ if (topFocusedStack == null) {
+ return false;
+ }
+
+ final ActivityRecord r = topFocusedStack.topRunningActivity();
+ return r != null && r.immersive;
}
}
@@ -1981,7 +1986,8 @@
public int getFrontActivityScreenCompatMode() {
enforceNotIsolatedCaller("getFrontActivityScreenCompatMode");
synchronized (mGlobalLock) {
- final ActivityRecord r = getTopDisplayFocusedStack().topRunningActivity();
+ final ActivityStack stack = getTopDisplayFocusedStack();
+ final ActivityRecord r = stack != null ? stack.topRunningActivity() : null;
if (r == null) {
return ActivityManager.COMPAT_MODE_UNKNOWN;
}
@@ -1995,7 +2001,8 @@
"setFrontActivityScreenCompatMode");
ApplicationInfo ai;
synchronized (mGlobalLock) {
- final ActivityRecord r = getTopDisplayFocusedStack().topRunningActivity();
+ final ActivityStack stack = getTopDisplayFocusedStack();
+ final ActivityRecord r = stack != null ? stack.topRunningActivity() : null;
if (r == null) {
Slog.w(TAG, "setFrontActivityScreenCompatMode failed: no top activity");
return;
@@ -2383,7 +2390,10 @@
synchronized (mGlobalLock) {
final long origId = Binder.clearCallingIdentity();
try {
- getTopDisplayFocusedStack().unhandledBackLocked();
+ final ActivityStack topFocusedStack = getTopDisplayFocusedStack();
+ if (topFocusedStack != null) {
+ topFocusedStack.unhandledBackLocked();
+ }
} finally {
Binder.restoreCallingIdentity(origId);
}
@@ -3622,7 +3632,8 @@
"enqueueAssistContext()");
synchronized (mGlobalLock) {
- ActivityRecord activity = getTopDisplayFocusedStack().getTopNonFinishingActivity();
+ final ActivityStack stack = getTopDisplayFocusedStack();
+ ActivityRecord activity = stack != null ? stack.getTopNonFinishingActivity() : null;
if (activity == null) {
Slog.w(TAG, "getAssistContextExtras failed: no top activity");
return null;
@@ -7043,9 +7054,9 @@
mRootWindowContainer.dumpDisplayConfigs(pw, " ");
}
if (dumpAll) {
- if (dumpPackage == null) {
- pw.println(" mConfigWillChange: "
- + getTopDisplayFocusedStack().mConfigWillChange);
+ final ActivityStack topFocusedStack = getTopDisplayFocusedStack();
+ if (dumpPackage == null && topFocusedStack != null) {
+ pw.println(" mConfigWillChange: " + topFocusedStack.mConfigWillChange);
}
if (mCompatModePackages.getPackages().size() > 0) {
boolean printed = false;
@@ -7126,7 +7137,10 @@
synchronized (mGlobalLock) {
if (dumpPackage == null) {
getGlobalConfiguration().dumpDebug(proto, GLOBAL_CONFIGURATION);
- proto.write(CONFIG_WILL_CHANGE, getTopDisplayFocusedStack().mConfigWillChange);
+ final ActivityStack topFocusedStack = getTopDisplayFocusedStack();
+ if (topFocusedStack != null) {
+ proto.write(CONFIG_WILL_CHANGE, topFocusedStack.mConfigWillChange);
+ }
writeSleepStateToProto(proto, wakeFullness, testPssMode);
if (mRunningVoice != null) {
final long vrToken = proto.start(