diff --git a/api/current.xml b/api/current.xml
index 75746c99329ae..ee0a90acfc1ad 100644
--- a/api/current.xml
+++ b/api/current.xml
@@ -115374,6 +115374,144 @@
 >
 </field>
 </class>
+<class name="TextToSpeech.Engine"
+ extends="java.lang.Object"
+ abstract="false"
+ static="false"
+ final="false"
+ deprecated="not deprecated"
+ visibility="public"
+>
+<constructor name="TextToSpeech.Engine"
+ type="android.speech.tts.TextToSpeech.Engine"
+ static="false"
+ final="false"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</constructor>
+<field name="CHECK_VOICE_DATA_BAD_DATA"
+ type="int"
+ transient="false"
+ volatile="false"
+ value="-1"
+ static="true"
+ final="true"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</field>
+<field name="CHECK_VOICE_DATA_FAIL"
+ type="int"
+ transient="false"
+ volatile="false"
+ value="0"
+ static="true"
+ final="true"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</field>
+<field name="CHECK_VOICE_DATA_MISSING_DATA"
+ type="int"
+ transient="false"
+ volatile="false"
+ value="-2"
+ static="true"
+ final="true"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</field>
+<field name="CHECK_VOICE_DATA_MISSING_VOLUME"
+ type="int"
+ transient="false"
+ volatile="false"
+ value="-3"
+ static="true"
+ final="true"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</field>
+<field name="CHECK_VOICE_DATA_PASS"
+ type="int"
+ transient="false"
+ volatile="false"
+ value="1"
+ static="true"
+ final="true"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</field>
+<field name="TTS_DEFAULT_STREAM"
+ type="int"
+ transient="false"
+ volatile="false"
+ value="3"
+ static="true"
+ final="true"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</field>
+<field name="TTS_KEY_PARAM_STREAM"
+ type="java.lang.String"
+ transient="false"
+ volatile="false"
+ value="&quot;streamType&quot;"
+ static="true"
+ final="true"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</field>
+<field name="TTS_KEY_PARAM_UTTERANCE_ID"
+ type="java.lang.String"
+ transient="false"
+ volatile="false"
+ value="&quot;utteranceId&quot;"
+ static="true"
+ final="true"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</field>
+<field name="VOICE_DATA_FILES"
+ type="java.lang.String"
+ transient="false"
+ volatile="false"
+ value="&quot;dataFiles&quot;"
+ static="true"
+ final="true"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</field>
+<field name="VOICE_DATA_FILES_INFO"
+ type="java.lang.String"
+ transient="false"
+ volatile="false"
+ value="&quot;dataFilesInfo&quot;"
+ static="true"
+ final="true"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</field>
+<field name="VOICE_DATA_ROOT_DIRECTORY"
+ type="java.lang.String"
+ transient="false"
+ volatile="false"
+ value="&quot;dataRoot&quot;"
+ static="true"
+ final="true"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</field>
+</class>
 <interface name="TextToSpeech.OnInitListener"
  abstract="true"
  static="true"
diff --git a/core/java/android/speech/tts/TextToSpeech.java b/core/java/android/speech/tts/TextToSpeech.java
index a2e70b8193f7b..db9f8d85295da 100755
--- a/core/java/android/speech/tts/TextToSpeech.java
+++ b/core/java/android/speech/tts/TextToSpeech.java
@@ -113,43 +113,131 @@ public class TextToSpeech {
     /**
      * Internal constants for the TTS functionality
      *
-     * {@hide}
      */
     public class Engine {
         // default values for a TTS engine when settings are not found in the provider
+        /**
+         * {@hide}
+         */
         public static final int FALLBACK_TTS_DEFAULT_RATE = 100; // 1x
+        /**
+         * {@hide}
+         */
         public static final int FALLBACK_TTS_DEFAULT_PITCH = 100;// 1x
+        /**
+         * {@hide}
+         */
         public static final int FALLBACK_TTS_USE_DEFAULTS = 0; // false
+        /**
+         * {@hide}
+         */
         public static final String FALLBACK_TTS_DEFAULT_SYNTH = "com.svox.pico";
 
         // default values for rendering
         public static final int TTS_DEFAULT_STREAM = AudioManager.STREAM_MUSIC;
 
         // return codes for a TTS engine's check data activity
+        /**
+         * Indicates success when checking the installation status of the resources used by the
+         * text-to-speech engine with the android.intent.action.CHECK_TTS_DATA intent.
+         */
         public static final int CHECK_VOICE_DATA_PASS = 1;
+        /**
+         * Indicates failure when checking the installation status of the resources used by the
+         * text-to-speech engine with the android.intent.action.CHECK_TTS_DATA intent.
+         */
         public static final int CHECK_VOICE_DATA_FAIL = 0;
+        /**
+         * Indicates erroneous data when checking the installation status of the resources used by
+         * the text-to-speech engine with the android.intent.action.CHECK_TTS_DATA intent.
+         */
         public static final int CHECK_VOICE_DATA_BAD_DATA = -1;
+        /**
+         * Indicates missing resources when checking the installation status of the resources used
+         * by the text-to-speech engine with the android.intent.action.CHECK_TTS_DATA intent.
+         */
         public static final int CHECK_VOICE_DATA_MISSING_DATA = -2;
-        public static final int CHECK_VOICE_DATA_MISSING_DATA_NO_SDCARD = -3;
+        /**
+         * Indicates missing storage volume when checking the installation status of the resources
+         * used by the text-to-speech engine with the android.intent.action.CHECK_TTS_DATA intent.
+         */
+        public static final int CHECK_VOICE_DATA_MISSING_VOLUME = -3;
 
         // return codes for a TTS engine's check data activity
+        /**
+         * Extra information received with the android.intent.action.CHECK_TTS_DATA intent where
+         * the text-to-speech engine specifies the path to its resources.
+         */
         public static final String VOICE_DATA_ROOT_DIRECTORY = "dataRoot";
+        /**
+         * Extra information received with the android.intent.action.CHECK_TTS_DATA intent where
+         * the text-to-speech engine specifies the file names of its resources under the
+         * resource path.
+         */
         public static final String VOICE_DATA_FILES = "dataFiles";
+        /**
+         * Extra information received with the android.intent.action.CHECK_TTS_DATA intent where
+         * the text-to-speech engine specifies the locale associated with each resource file.
+         */
         public static final String VOICE_DATA_FILES_INFO = "dataFilesInfo";
 
-        // keys for the parameters passed with speak commands
+        // keys for the parameters passed with speak commands. Hidden keys are used internally
+        // to maintain engine state for each TextToSpeech instance.
+        /**
+         * {@hide}
+         */
         public static final String TTS_KEY_PARAM_RATE = "rate";
+        /**
+         * {@hide}
+         */
         public static final String TTS_KEY_PARAM_LANGUAGE = "language";
+        /**
+         * {@hide}
+         */
         public static final String TTS_KEY_PARAM_COUNTRY = "country";
+        /**
+         * {@hide}
+         */
         public static final String TTS_KEY_PARAM_VARIANT = "variant";
+        /**
+         * Parameter key to specify the audio stream type to be used when speaking text
+         * or playing back a file.
+         */
         public static final String TTS_KEY_PARAM_STREAM = "streamType";
+        /**
+         * Parameter key to identify an utterance in the completion listener after text has been
+         * spoken, a file has been played back or a silence duration has elapsed.
+         */
         public static final String TTS_KEY_PARAM_UTTERANCE_ID = "utteranceId";
+
+        // key positions in the array of cached parameters
+        /**
+         * {@hide}
+         */
         protected static final int TTS_PARAM_POSITION_RATE = 0;
+        /**
+         * {@hide}
+         */
         protected static final int TTS_PARAM_POSITION_LANGUAGE = 2;
+        /**
+         * {@hide}
+         */
         protected static final int TTS_PARAM_POSITION_COUNTRY = 4;
+        /**
+         * {@hide}
+         */
         protected static final int TTS_PARAM_POSITION_VARIANT = 6;
+        /**
+         * {@hide}
+         */
         protected static final int TTS_PARAM_POSITION_STREAM = 8;
+        /**
+         * {@hide}
+         */
         protected static final int TTS_PARAM_POSITION_UTTERANCE_ID = 10;
+        /**
+         * {@hide}
+         */
         protected static final int TTS_NB_CACHED_PARAMS = 6;
     }