KeyChain API refinements

Change-Id: I177ab4642e6cd1aa13526c14f0a707175fd79655

keystore/java/android/security/KeyChainAliasCallback.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.security;
+
+import android.content.Intent;
+import java.security.PrivateKey;
+import java.security.cert.X509Certificate;
+
+/**
+ * The KeyChainAliasCallback is the callback for {@link
+ * KeyChain#choosePrivateKeyAlias}.
+ *
+ * @hide to be unhidden as part of KeyChain API
+ */
+public interface KeyChainAliasCallback {
+
+    /**
+     * Called with the alias of the certificate chosen by the user, or
+     * null if no value was chosen.
+     */
+    public void alias(String alias);
+}