Revert "Do not relaunch bg activities when application info changes"

This reverts commit 8b5afd93b6.

Reason for revert: b/186367826

Bug: 185301309
Change-Id: I7a68f1a32aff194d68af1c3ef55dc60ffbde5df9

core/java/android/app/ActivityThread.java

@@ -5961,6 +5961,20 @@ public final class ActivityThread extends ClientTransactionHandler
             // Update all affected Resources objects to use new ResourcesImpl
             mResourcesManager.applyNewResourceDirsLocked(ai, oldResDirs);
         }
+
+        ApplicationPackageManager.configurationChanged();
+
+        // Trigger a regular Configuration change event, only with a different assetsSeq number
+        // so that we actually call through to all components.
+        // TODO(adamlesinski): Change this to make use of ActivityManager's upcoming ability to
+        // store configurations per-process.
+        final Configuration config = mConfigurationController.getConfiguration();
+        Configuration newConfig = new Configuration();
+        newConfig.assetsSeq = (config != null ? config.assetsSeq : 0) + 1;
+        mConfigurationController.handleConfigurationChanged(newConfig, null /* compat */);
+
+        // Preserve windows to avoid black flickers when overlays change.
+        relaunchAllActivities(true /* preserveWindows */, "handleApplicationInfoChanged");
     }
 
     /**

core/tests/coretests/src/android/app/activity/ActivityThreadTest.java

@@ -184,6 +184,15 @@ public class ActivityThreadTest {
         });
     }
 
+    @Test
+    public void testHandleActivity_assetsChanged() {
+        relaunchActivityAndAssertPreserveWindow(activity -> {
+            // Relaunches all activities.
+            activity.getActivityThread().handleApplicationInfoChanged(
+                    activity.getApplicationInfo());
+        });
+    }
+
     @Test
     public void testRecreateActivity() {
         relaunchActivityAndAssertPreserveWindow(Activity::recreate);

services/core/java/com/android/server/am/ProcessList.java

@@ -77,7 +77,6 @@ import android.content.IntentFilter;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.IPackageManager;
 import android.content.pm.PackageManagerInternal;
-import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.graphics.Point;
 import android.net.LocalSocket;
@@ -4644,12 +4643,6 @@ public final class ProcessList {
                 }
             });
         }
-
-        // Update the global configuration and increase the assets sequence number.
-        Configuration currentConfig = mService.mActivityTaskManager.getConfiguration();
-        Configuration newConfig = new Configuration();
-        newConfig.assetsSeq = (currentConfig != null ? currentConfig.assetsSeq : 0) + 1;
-        mService.mActivityTaskManager.updateConfiguration(newConfig);
     }
 
     @GuardedBy("mService")