diff --git a/java/res/values/strings.xml b/java/res/values/strings.xml
index 8822e8d..bab612b 100644
--- a/java/res/values/strings.xml
+++ b/java/res/values/strings.xml
@@ -313,6 +313,10 @@
     <!-- TODO: remove translatable=false attribute once text is stable -->
     <string name="research_log_uploader_name" translatable="false">Research Uploader Service</string>
 
+    <!-- Name for the research replaying service to be displayed to users.  [CHAR LIMIT=50] -->
+    <!-- TODO: remove translatable=false attribute once text is stable -->
+    <string name="research_log_replayer_name" translatable="false">Research Replayer Service</string>
+
     <!-- Preference for input language selection -->
     <string name="select_language">Input languages</string>
 
diff --git a/java/src/com/android/inputmethod/research/Replayer.java b/java/src/com/android/inputmethod/research/Replayer.java
index 4cc2a58..611abb2 100644
--- a/java/src/com/android/inputmethod/research/Replayer.java
+++ b/java/src/com/android/inputmethod/research/Replayer.java
@@ -1,22 +1,23 @@
 /*
  * Copyright (C) 2012 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
+ * 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
+ *      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.
+ * 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 com.android.inputmethod.research;
 
 import android.os.Handler;
+import android.os.Looper;
 import android.os.Message;
 import android.os.SystemClock;
 import android.util.Log;
@@ -40,6 +41,14 @@
     private boolean mIsReplaying = false;
     private KeyboardSwitcher mKeyboardSwitcher;
 
+    private Replayer() {
+    }
+
+    private static final Replayer sInstance = new Replayer();
+    public static Replayer getInstance() {
+        return sInstance;
+    }
+
     public void setKeyboardSwitcher(final KeyboardSwitcher keyboardSwitcher) {
         mKeyboardSwitcher = keyboardSwitcher;
     }
@@ -49,7 +58,7 @@
     private static final int COMPLETION_TIME_MS = 500;
 
     // TODO: Support historical events and multi-touch.
-    public void replay(final ReplayData replayData) {
+    public void replay(final ReplayData replayData, final Runnable callback) {
         if (mIsReplaying) {
             return;
         }
@@ -72,7 +81,7 @@
         // The adjustment needed to translate times from the original recorded time to the current
         // time.
         final long timeAdjustment = currentStartTime - origStartTime;
-        final Handler handler = new Handler() {
+        final Handler handler = new Handler(Looper.getMainLooper()) {
             // Track the time of the most recent DOWN event, to be passed as a parameter when
             // constructing a MotionEvent.  It's initialized here to the origStartTime, but this is
             // only a precaution.  The value should be overwritten by the first ACTION_DOWN event
@@ -113,8 +122,12 @@
                 Log.d(TAG, "queuing event at " + msgTime);
             }
         }
+
         final long presentDoneTime = replayData.mTimes.get(numActions - 1) + timeAdjustment
                 + COMPLETION_TIME_MS;
         handler.sendMessageAtTime(Message.obtain(handler, MSG_DONE), presentDoneTime);
+        if (callback != null) {
+            handler.postAtTime(callback, presentDoneTime + 1);
+        }
     }
 }
diff --git a/java/src/com/android/inputmethod/research/ReplayerService.java b/java/src/com/android/inputmethod/research/ReplayerService.java
new file mode 100644
index 0000000..88d9033
--- /dev/null
+++ b/java/src/com/android/inputmethod/research/ReplayerService.java
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2012 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 com.android.inputmethod.research;
+
+import android.app.IntentService;
+import android.content.Intent;
+import android.util.Log;
+
+import com.android.inputmethod.research.MotionEventReader.ReplayData;
+
+import java.io.File;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Provide a mechanism to invoke the replayer from outside.
+ *
+ * In particular, makes access from a host possible through {@code adb am startservice}.
+ */
+public class ReplayerService extends IntentService {
+    private static final String TAG = ReplayerService.class.getSimpleName();
+    private static final String EXTRA_FILENAME = "com.android.inputmethod.research.extra.FILENAME";
+    private static final long MAX_REPLAY_TIME = TimeUnit.SECONDS.toMillis(60);
+
+    public ReplayerService() {
+        super(ReplayerService.class.getSimpleName());
+    }
+
+    @Override
+    protected void onHandleIntent(final Intent intent) {
+        final String filename = intent.getStringExtra(EXTRA_FILENAME);
+        if (filename == null) return;
+
+        final ReplayData replayData = new MotionEventReader().readMotionEventData(
+                new File(filename));
+        synchronized (this) {
+            Replayer.getInstance().replay(replayData, new Runnable() {
+                @Override
+                public void run() {
+                    synchronized (ReplayerService.this) {
+                        ReplayerService.this.notify();
+                    }
+                }
+            });
+            try {
+                wait(MAX_REPLAY_TIME);
+            } catch (InterruptedException e) {
+                Log.e(TAG, "Timeout while replaying.", e);
+            }
+        }
+    }
+}
diff --git a/java/src/com/android/inputmethod/research/ResearchLogger.java b/java/src/com/android/inputmethod/research/ResearchLogger.java
index 096f032..d9849bd 100644
--- a/java/src/com/android/inputmethod/research/ResearchLogger.java
+++ b/java/src/com/android/inputmethod/research/ResearchLogger.java
@@ -187,7 +187,7 @@
     private LatinIME mLatinIME;
     private final Statistics mStatistics;
     private final MotionEventReader mMotionEventReader = new MotionEventReader();
-    private final Replayer mReplayer = new Replayer();
+    private final Replayer mReplayer = Replayer.getInstance();
 
     private Intent mUploadIntent;
     private Intent mUploadNowIntent;
@@ -783,7 +783,7 @@
                 public void run() {
                     final ReplayData replayData =
                             mMotionEventReader.readMotionEventData(mUserRecordingFile);
-                    mReplayer.replay(replayData);
+                    mReplayer.replay(replayData, null);
                 }
             }, 1000);
         }