add an accessor for Context for use by subclasses

core/java/android/accounts/AccountAuthenticatorCache.java

@@ -21,6 +21,7 @@ import android.content.pm.RegisteredServicesCache;
 import android.content.res.TypedArray;
 import android.content.Context;
 import android.util.AttributeSet;
+import android.text.TextUtils;
 
 /**
  * A cache of services that export the {@link IAccountAuthenticator} interface. This cache
@@ -48,6 +49,9 @@ import android.util.AttributeSet;
                     com.android.internal.R.styleable.AccountAuthenticator_label, 0);
             final int iconId = sa.getResourceId(
                     com.android.internal.R.styleable.AccountAuthenticator_icon, 0);
+            if (TextUtils.isEmpty(accountType)) {
+                return null;
+            }
             return new AuthenticatorDescription(accountType, packageName, labelId, iconId);
         } finally {
             sa.recycle();

core/java/android/accounts/AuthenticatorDescription.java

@@ -10,6 +10,8 @@ public class AuthenticatorDescription implements Parcelable {
     final public String packageName;
 
     public AuthenticatorDescription(String type, String packageName, int labelId, int iconId) {
+        if (type == null) throw new IllegalArgumentException("type cannot be null");
+        if (packageName == null) throw new IllegalArgumentException("packageName cannot be null");
         this.type = type;
         this.packageName = packageName;
         this.labelId = labelId;
@@ -17,6 +19,7 @@ public class AuthenticatorDescription implements Parcelable {
     }
 
     public static AuthenticatorDescription newKey(String type) {
+        if (type == null) throw new IllegalArgumentException("type cannot be null");
         return new AuthenticatorDescription(type);
     }
 

core/java/android/content/AbstractThreadedSyncAdapter.java

@@ -64,6 +64,10 @@ public abstract class AbstractThreadedSyncAdapter {
         mAutoInitialize = autoInitialize;
     }
 
+    public Context getContext() {
+        return mContext;
+    }
+
     class ISyncAdapterImpl extends ISyncAdapter.Stub {
         public void startSync(ISyncContext syncContext, String authority, Account account,
                 Bundle extras) {