Exception when performing the global gestrue to enable accessibility.

1. If there is a non-speaking accessibility service installed and the
   global gesture is performed an exception is thrown since an attempt
   is made to modify the list with services returned by the accessibility
   manager (to remove the non-speaking ones) but this list is immutable.
   Now the returned services are put into a mutable list before removing
   the non-speaking ones.

bug:7280996

Change-Id: I2852a3e169c1d34d942b50fb439e0961394c92bc

1 files changed, 4 insertions, 2 deletions

diff --git a/policy/src/com/android/internal/policy/impl/EnableAccessibilityController.java b/policy/src/com/android/internal/policy/impl/EnableAccessibilityController.java
index 889463b7eec0..71b0d53572d2 100644
--- a/policy/src/com/android/internal/policy/impl/EnableAccessibilityController.java
+++ b/policy/src/com/android/internal/policy/impl/EnableAccessibilityController.java
@@ -40,6 +40,7 @@ import android.view.accessibility.IAccessibilityManager;
 
 import com.android.internal.R;
 
+import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
 
@@ -131,8 +132,9 @@ public class EnableAccessibilityController {
 
     private static List<AccessibilityServiceInfo> getInstalledSpeakingAccessibilityServices(
             Context context) {
-        List<AccessibilityServiceInfo> services = AccessibilityManager.getInstance(
-                context).getInstalledAccessibilityServiceList();
+        List<AccessibilityServiceInfo> services = new ArrayList<AccessibilityServiceInfo>();
+        services.addAll(AccessibilityManager.getInstance(context)
+                .getInstalledAccessibilityServiceList());
         Iterator<AccessibilityServiceInfo> iterator = services.iterator();
         while (iterator.hasNext()) {
             AccessibilityServiceInfo service = iterator.next();