diff --git a/packages/MediaComponents/src/com/android/media/MediaController2Impl.java b/packages/MediaComponents/src/com/android/media/MediaController2Impl.java
index edba88a..6567cd0 100644
--- a/packages/MediaComponents/src/com/android/media/MediaController2Impl.java
+++ b/packages/MediaComponents/src/com/android/media/MediaController2Impl.java
@@ -341,27 +341,28 @@
 
     @Override
     public void prepare_impl() {
-        // TODO(jaewan): Implement
+        sendTransportControlCommand(MediaSession2.COMMAND_CODE_PLAYBACK_PREPARE);
     }
 
     @Override
     public void fastForward_impl() {
-        // TODO(jaewan): Implement
+        sendTransportControlCommand(MediaSession2.COMMAND_CODE_PLAYBACK_FAST_FORWARD);
     }
 
     @Override
     public void rewind_impl() {
-        // TODO(jaewan): Implement
+        sendTransportControlCommand(MediaSession2.COMMAND_CODE_PLAYBACK_REWIND);
     }
 
     @Override
     public void seekTo_impl(long pos) {
-        // TODO(jaewan): Implement
+        sendTransportControlCommand(MediaSession2.COMMAND_CODE_PLAYBACK_SEEK_TO, pos);
     }
 
     @Override
     public void setCurrentPlaylistItem_impl(int index) {
-        // TODO(jaewan): Implement
+        sendTransportControlCommand(
+                MediaSession2.COMMAND_CODE_PLAYBACK_SET_CURRENT_PLAYLIST_ITEM, index);
     }
 
     @Override
diff --git a/packages/MediaComponents/src/com/android/media/MediaSession2Impl.java b/packages/MediaComponents/src/com/android/media/MediaSession2Impl.java
index 29b6785..28834a3 100644
--- a/packages/MediaComponents/src/com/android/media/MediaSession2Impl.java
+++ b/packages/MediaComponents/src/com/android/media/MediaSession2Impl.java
@@ -273,27 +273,37 @@
 
     @Override
     public void prepare_impl() {
-        // TODO(jaewan): Implement
+        ensureCallingThread();
+        ensurePlayer();
+        mPlayer.prepare();
     }
 
     @Override
     public void fastForward_impl() {
-        // TODO(jaewan): Implement
+        ensureCallingThread();
+        ensurePlayer();
+        mPlayer.fastForward();
     }
 
     @Override
     public void rewind_impl() {
-        // TODO(jaewan): Implement
+        ensureCallingThread();
+        ensurePlayer();
+        mPlayer.rewind();
     }
 
     @Override
     public void seekTo_impl(long pos) {
-        // TODO(jaewan): Implement
+        ensureCallingThread();
+        ensurePlayer();
+        mPlayer.seekTo(pos);
     }
 
     @Override
     public void setCurrentPlaylistItem_impl(int index) {
-        // TODO(jaewan): Implement
+        ensureCallingThread();
+        ensurePlayer();
+        mPlayer.setCurrentPlaylistItem(index);
     }
 
     ///////////////////////////////////////////////////
diff --git a/packages/MediaComponents/src/com/android/media/MediaSession2Stub.java b/packages/MediaComponents/src/com/android/media/MediaSession2Stub.java
index 64c8571..69e8498 100644
--- a/packages/MediaComponents/src/com/android/media/MediaSession2Stub.java
+++ b/packages/MediaComponents/src/com/android/media/MediaSession2Stub.java
@@ -187,6 +187,21 @@
                 case MediaSession2.COMMAND_CODE_PLAYBACK_SKIP_NEXT_ITEM:
                     session.getInstance().skipToNext();
                     break;
+                case MediaSession2.COMMAND_CODE_PLAYBACK_PREPARE:
+                    session.getInstance().prepare();
+                    break;
+                case MediaSession2.COMMAND_CODE_PLAYBACK_FAST_FORWARD:
+                    session.getInstance().fastForward();
+                    break;
+                case MediaSession2.COMMAND_CODE_PLAYBACK_REWIND:
+                    session.getInstance().rewind();
+                    break;
+                case MediaSession2.COMMAND_CODE_PLAYBACK_SEEK_TO:
+                    session.getInstance().seekTo(arg);
+                    break;
+                case MediaSession2.COMMAND_CODE_PLAYBACK_SET_CURRENT_PLAYLIST_ITEM:
+                    session.getInstance().setCurrentPlaylistItem((int) arg);
+                    break;
                 default:
                     // TODO(jaewan): Resend unknown (new) commands through the custom command.
             }
diff --git a/packages/MediaComponents/test/src/android/media/MediaController2Test.java b/packages/MediaComponents/test/src/android/media/MediaController2Test.java
index 8e7b7f8..3e39f40 100644
--- a/packages/MediaComponents/test/src/android/media/MediaController2Test.java
+++ b/packages/MediaComponents/test/src/android/media/MediaController2Test.java
@@ -101,7 +101,6 @@
         assertTrue(mPlayer.mPauseCalled);
     }
 
-
     @Test
     public void testSkipToPrevious() throws InterruptedException {
         mController.skipToPrevious();
@@ -136,6 +135,65 @@
     }
 
     @Test
+    public void testPrepare() throws InterruptedException {
+        mController.prepare();
+        try {
+            assertTrue(mPlayer.mCountDownLatch.await(WAIT_TIME_MS, TimeUnit.MILLISECONDS));
+        } catch (InterruptedException e) {
+            fail(e.getMessage());
+        }
+        assertTrue(mPlayer.mPrepareCalled);
+    }
+
+    @Test
+    public void testFastForward() throws InterruptedException {
+        mController.fastForward();
+        try {
+            assertTrue(mPlayer.mCountDownLatch.await(WAIT_TIME_MS, TimeUnit.MILLISECONDS));
+        } catch (InterruptedException e) {
+            fail(e.getMessage());
+        }
+        assertTrue(mPlayer.mFastForwardCalled);
+    }
+
+    @Test
+    public void testRewind() throws InterruptedException {
+        mController.rewind();
+        try {
+            assertTrue(mPlayer.mCountDownLatch.await(WAIT_TIME_MS, TimeUnit.MILLISECONDS));
+        } catch (InterruptedException e) {
+            fail(e.getMessage());
+        }
+        assertTrue(mPlayer.mRewindCalled);
+    }
+
+    @Test
+    public void testSeekTo() throws InterruptedException {
+        final long seekPosition = 12125L;
+        mController.seekTo(seekPosition);
+        try {
+            assertTrue(mPlayer.mCountDownLatch.await(WAIT_TIME_MS, TimeUnit.MILLISECONDS));
+        } catch (InterruptedException e) {
+            fail(e.getMessage());
+        }
+        assertTrue(mPlayer.mSeekToCalled);
+        assertEquals(seekPosition, mPlayer.mSeekPosition);
+    }
+
+    @Test
+    public void testSetCurrentPlaylistItem() throws InterruptedException {
+        final int itemIndex = 9;
+        mController.setCurrentPlaylistItem(itemIndex);
+        try {
+            assertTrue(mPlayer.mCountDownLatch.await(WAIT_TIME_MS, TimeUnit.MILLISECONDS));
+        } catch (InterruptedException e) {
+            fail(e.getMessage());
+        }
+        assertTrue(mPlayer.mSetCurrentPlaylistItemCalled);
+        assertEquals(itemIndex, mPlayer.mItemIndex);
+    }
+
+    @Test
     public void testGetPackageName() {
         assertEquals(mContext.getPackageName(), mController.getSessionToken().getPackageName());
     }
diff --git a/packages/MediaComponents/test/src/android/media/MockPlayer.java b/packages/MediaComponents/test/src/android/media/MockPlayer.java
index aacbe1d..d0d1178 100644
--- a/packages/MediaComponents/test/src/android/media/MockPlayer.java
+++ b/packages/MediaComponents/test/src/android/media/MockPlayer.java
@@ -37,6 +37,14 @@
     public boolean mStopCalled;
     public boolean mSkipToPreviousCalled;
     public boolean mSkipToNextCalled;
+    public boolean mPrepareCalled;
+    public boolean mFastForwardCalled;
+    public boolean mRewindCalled;
+    public boolean mSeekToCalled;
+    public long mSeekPosition;
+    public boolean mSetCurrentPlaylistItemCalled;
+    public int mItemIndex;
+
     public List<PlaybackListenerHolder> mListeners = new ArrayList<>();
     private PlaybackState2 mLastPlaybackState;
 
@@ -84,7 +92,47 @@
         }
     }
 
+    @Override
+    public void prepare() {
+        mPrepareCalled = true;
+        if (mCountDownLatch != null) {
+            mCountDownLatch.countDown();
+        }
+    }
 
+    @Override
+    public void fastForward() {
+        mFastForwardCalled = true;
+        if (mCountDownLatch != null) {
+            mCountDownLatch.countDown();
+        }
+    }
+
+    @Override
+    public void rewind() {
+        mRewindCalled = true;
+        if (mCountDownLatch != null) {
+            mCountDownLatch.countDown();
+        }
+    }
+
+    @Override
+    public void seekTo(long pos) {
+        mSeekToCalled = true;
+        mSeekPosition = pos;
+        if (mCountDownLatch != null) {
+            mCountDownLatch.countDown();
+        }
+    }
+
+    @Override
+    public void setCurrentPlaylistItem(int index) {
+        mSetCurrentPlaylistItemCalled = true;
+        mItemIndex = index;
+        if (mCountDownLatch != null) {
+            mCountDownLatch.countDown();
+        }
+    }
 
     @Nullable
     @Override
@@ -113,23 +161,6 @@
         }
     }
 
-    // No-op. Should be added for test later.
-    @Override
-    public void prepare() {
-    }
-
-    @Override
-    public void seekTo(long pos) {
-    }
-
-    @Override
-    public void fastFoward() {
-    }
-
-    @Override
-    public void rewind() {
-    }
-
     @Override
     public AudioAttributes getAudioAttributes() {
         return null;
@@ -138,8 +169,4 @@
     @Override
     public void setPlaylist(List<MediaItem2> item, PlaylistParams param) {
     }
-
-    @Override
-    public void setCurrentPlaylistItem(int index) {
-    }
 }