Clear preferred activities when home process crashes

If the "default" Home application has been replaced with
a third-party app that is repeatedly crashing at start-up,
there is no way for the user to clear the preferred activities
or uninstall the bad application. If we clear the package
preferred activities when the application crashes, the user
will be prompted with the ResolverActivity at the next boot
and can try using the app again or choose to use another
Home application.

Change-Id: I8ba8e95e6752916d50515d96c117d3084fa980fd

1 files changed, 22 insertions, 1 deletions

diff --git a/services/java/com/android/server/am/ActivityManagerService.java b/services/java/com/android/server/am/ActivityManagerService.java
index a388311..804af9c 100644
--- a/services/java/com/android/server/am/ActivityManagerService.java
+++ b/services/java/com/android/server/am/ActivityManagerService.java
@@ -9047,7 +9047,28 @@ public final class ActivityManagerService extends ActivityManagerNative implemen
                 sr.crashCount++;
             }
         }
-        
+
+        // If the crashing process is what we consider to be the "home process" and it has been
+        // replaced by a third-party app, clear the package preferred activities from packages
+        // with a home activity running in the process to prevent a repeatedly crashing app
+        // from blocking the user to manually clear the list.
+        if (app == mHomeProcess && mHomeProcess.activities.size() > 0
+                    && (mHomeProcess.info.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {
+            Iterator it = mHomeProcess.activities.iterator();
+            while (it.hasNext()) {
+                HistoryRecord r = (HistoryRecord)it.next();
+                if (r.isHomeActivity) {
+                    Log.i(TAG, "Clearing package preferred activities from " + r.packageName);
+                    try {
+                        ActivityThread.getPackageManager()
+                                .clearPackagePreferredActivities(r.packageName);
+                    } catch (RemoteException c) {
+                        // pm is in same process, this will never happen.
+                    }
+                }
+            }
+        }
+
         mProcessCrashTimes.put(app.info.processName, app.info.uid, now);
         return true;
     }