Fix admin enable/disable of Bluetooth file sharing

This is an extremely partial fix for a mostly-broken feature. For
fully-managed devices, this fixes the toggle for the file sharing
option, by detecting which Bluetooth package should be used rather than
just guessing.

However, on work profiles, the file sharing option does not really work
anyway, it just infinitely loads. In addition, it is not correctly
disabled when Bluetooth stops, so the icon just remains but doesn't
do anything.

A full fix would add the enable/disable sequence for *work* UserHandles
to BluetoothOppManager, so the LAUNCHER_ACTIVITY is properly enabled and
disabled. In addition, it would fix the issue described in the linked
bug to prevent infinite loading (dedicated bug: b/112625123).

Tag: #stability
Ignore-AOSP-First: For T?
Bug: 237389774
Test: Manual, verifying the *badged* BT file sharing icon appears/disappears as needed

Change-Id: I070987bc884947246c372c65691c4866ebd1e7c7
(cherry picked from commit 36362f254b029bd96d00705a141eff3345864b5b)
Merged-In: I070987bc884947246c372c65691c4866ebd1e7c7

service/java/com/android/server/bluetooth/BluetoothManagerService.java

@@ -56,6 +56,7 @@
 import android.content.IntentFilter;
 import android.content.ServiceConnection;
 import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
 import android.database.ContentObserver;
@@ -2892,24 +2893,56 @@ private boolean isBluetoothDisallowed() {
      */
     private void updateOppLauncherComponentState(UserHandle userHandle,
             boolean bluetoothSharingDisallowed) {
-        final ComponentName oppLauncherComponent = new ComponentName(
-                mContext.getPackageManager().getPackagesForUid(Process.BLUETOOTH_UID)[0],
-                "com.android.bluetooth.opp.BluetoothOppLauncherActivity");
-        int newState;
-        if (bluetoothSharingDisallowed) {
-            newState = PackageManager.COMPONENT_ENABLED_STATE_DISABLED;
-        } else if (BluetoothProperties.isProfileOppEnabled().orElse(false)) {
-            newState = PackageManager.COMPONENT_ENABLED_STATE_ENABLED;
-        } else {
-            newState = PackageManager.COMPONENT_ENABLED_STATE_DEFAULT;
-        }
         try {
-            mContext.createContextAsUser(userHandle, 0)
-                .getPackageManager()
-                .setComponentEnabledSetting(oppLauncherComponent, newState,
-                        PackageManager.DONT_KILL_APP);
+            int newState;
+            if (bluetoothSharingDisallowed) {
+                newState = PackageManager.COMPONENT_ENABLED_STATE_DISABLED;
+            } else if (BluetoothProperties.isProfileOppEnabled().orElse(false)) {
+                newState = PackageManager.COMPONENT_ENABLED_STATE_ENABLED;
+            } else {
+                newState = PackageManager.COMPONENT_ENABLED_STATE_DEFAULT;
+            }
+
+            String launcherActivity = "com.android.bluetooth.opp.BluetoothOppLauncherActivity";
+
+            PackageManager packageManager = mContext.createContextAsUser(userHandle, 0)
+                                                        .getPackageManager();
+            var allPackages = packageManager.getPackagesForUid(Process.BLUETOOTH_UID);
+            for (String candidatePackage : allPackages) {
+                PackageInfo packageInfo;
+                try {
+                    // note: we need the package manager for the SYSTEM user, not our userHandle
+                    packageInfo = mContext.getPackageManager().getPackageInfo(
+                        candidatePackage,
+                        PackageManager.PackageInfoFlags.of(PackageManager.GET_ACTIVITIES));
+                } catch (PackageManager.NameNotFoundException e) {
+                    // ignore, try next package
+                    Log.e(TAG, "Could not find package " + candidatePackage);
+                    continue;
+                } catch (Exception e) {
+                    Log.e(TAG, "Error while loading package" + e);
+                    continue;
+                }
+                if (packageInfo.activities == null) {
+                    continue;
+                }
+                for (var activity : packageInfo.activities) {
+                    if (launcherActivity.equals(activity.name)) {
+                        final ComponentName oppLauncherComponent = new ComponentName(
+                                candidatePackage, launcherActivity
+                        );
+                        packageManager.setComponentEnabledSetting(
+                                oppLauncherComponent, newState, PackageManager.DONT_KILL_APP
+                        );
+                        return;
+                    }
+                }
+            }
+
+            Log.e(TAG,
+                    "Cannot toggle BluetoothOppLauncherActivity, could not find it in any package");
         } catch (Exception e) {
-            // The component was not found, do nothing.
+            Log.e(TAG, "updateOppLauncherComponentState failed: " + e);
         }
     }