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diff --git a/java/com/android/incallui/InCallOrientationEventListener.java b/java/com/android/incallui/InCallOrientationEventListener.java
new file mode 100644
index 000000000..e6b0bc027
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+++ b/java/com/android/incallui/InCallOrientationEventListener.java
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+/*
+ * Copyright (C) 2015 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.incallui;
+
+import android.content.Context;
+import android.content.pm.ActivityInfo;
+import android.support.annotation.IntDef;
+import android.view.OrientationEventListener;
+import com.android.dialer.common.LogUtil;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+/**
+ * This class listens to Orientation events and overrides onOrientationChanged which gets invoked
+ * when an orientation change occurs. When that happens, we notify InCallUI registrants of the
+ * change.
+ */
+public class InCallOrientationEventListener extends OrientationEventListener {
+
+  public static final int SCREEN_ORIENTATION_0 = 0;
+  public static final int SCREEN_ORIENTATION_90 = 90;
+  public static final int SCREEN_ORIENTATION_180 = 180;
+  public static final int SCREEN_ORIENTATION_270 = 270;
+  public static final int SCREEN_ORIENTATION_360 = 360;
+
+  /** Screen orientation angles one of 0, 90, 180, 270, 360 in degrees. */
+  @Retention(RetentionPolicy.SOURCE)
+  @IntDef({
+    SCREEN_ORIENTATION_0,
+    SCREEN_ORIENTATION_90,
+    SCREEN_ORIENTATION_180,
+    SCREEN_ORIENTATION_270,
+    SCREEN_ORIENTATION_360,
+    SCREEN_ORIENTATION_UNKNOWN
+  })
+  public @interface ScreenOrientation {}
+
+  // We use SCREEN_ORIENTATION_USER so that reverse-portrait is not allowed.
+  public static final int ACTIVITY_PREFERENCE_ALLOW_ROTATION = ActivityInfo.SCREEN_ORIENTATION_USER;
+
+  public static final int ACTIVITY_PREFERENCE_DISALLOW_ROTATION =
+      ActivityInfo.SCREEN_ORIENTATION_NOSENSOR;
+
+  /**
+   * This is to identify dead zones where we won't notify others of orientation changed. Say for e.g
+   * our threshold is x degrees. We will only notify UI when our current rotation is within x
+   * degrees right or left of the screen orientation angles. If it's not within those ranges, we
+   * return SCREEN_ORIENTATION_UNKNOWN and ignore it.
+   */
+  public static final int SCREEN_ORIENTATION_UNKNOWN = -1;
+
+  // Rotation threshold is 10 degrees. So if the rotation angle is within 10 degrees of any of
+  // the above angles, we will notify orientation changed.
+  private static final int ROTATION_THRESHOLD = 10;
+
+  /** Cache the current rotation of the device. */
+  @ScreenOrientation private static int sCurrentOrientation = SCREEN_ORIENTATION_0;
+
+  private boolean mEnabled = false;
+
+  public InCallOrientationEventListener(Context context) {
+    super(context);
+  }
+
+  private static boolean isWithinRange(int value, int begin, int end) {
+    return value >= begin && value < end;
+  }
+
+  private static boolean isWithinThreshold(int value, int center, int threshold) {
+    return isWithinRange(value, center - threshold, center + threshold);
+  }
+
+  private static boolean isInLeftRange(int value, int center, int threshold) {
+    return isWithinRange(value, center - threshold, center);
+  }
+
+  private static boolean isInRightRange(int value, int center, int threshold) {
+    return isWithinRange(value, center, center + threshold);
+  }
+
+  @ScreenOrientation
+  public static int getCurrentOrientation() {
+    return sCurrentOrientation;
+  }
+
+  /**
+   * Handles changes in device orientation. Notifies InCallPresenter of orientation changes.
+   *
+   * <p>Note that this API receives sensor rotation in degrees as a param and we convert that to one
+   * of our screen orientation constants - (one of: {@link #SCREEN_ORIENTATION_0}, {@link
+   * #SCREEN_ORIENTATION_90}, {@link #SCREEN_ORIENTATION_180}, {@link #SCREEN_ORIENTATION_270}).
+   *
+   * @param rotation The new device sensor rotation in degrees
+   */
+  @Override
+  public void onOrientationChanged(int rotation) {
+    if (rotation == OrientationEventListener.ORIENTATION_UNKNOWN) {
+      return;
+    }
+
+    final int orientation = toScreenOrientation(rotation);
+
+    if (orientation != SCREEN_ORIENTATION_UNKNOWN && sCurrentOrientation != orientation) {
+      LogUtil.i(
+          "InCallOrientationEventListener.onOrientationChanged",
+          "orientation: %d -> %d",
+          sCurrentOrientation,
+          orientation);
+      sCurrentOrientation = orientation;
+      InCallPresenter.getInstance().onDeviceOrientationChange(sCurrentOrientation);
+    }
+  }
+
+  /**
+   * Enables the OrientationEventListener and notifies listeners of current orientation if notify
+   * flag is true
+   *
+   * @param notify true or false. Notify device orientation changed if true.
+   */
+  public void enable(boolean notify) {
+    if (mEnabled) {
+      Log.v(this, "enable: Orientation listener is already enabled. Ignoring...");
+      return;
+    }
+
+    super.enable();
+    mEnabled = true;
+    if (notify) {
+      InCallPresenter.getInstance().onDeviceOrientationChange(sCurrentOrientation);
+    }
+  }
+
+  /** Enables the OrientationEventListener with notify flag defaulting to false. */
+  @Override
+  public void enable() {
+    enable(false);
+  }
+
+  /** Disables the OrientationEventListener. */
+  @Override
+  public void disable() {
+    if (!mEnabled) {
+      Log.v(this, "enable: Orientation listener is already disabled. Ignoring...");
+      return;
+    }
+
+    mEnabled = false;
+    super.disable();
+  }
+
+  /** Returns true the OrientationEventListener is enabled, false otherwise. */
+  public boolean isEnabled() {
+    return mEnabled;
+  }
+
+  /**
+   * Converts sensor rotation in degrees to screen orientation constants.
+   *
+   * @param rotation sensor rotation angle in degrees
+   * @return Screen orientation angle in degrees (0, 90, 180, 270). Returns -1 for degrees not
+   *     within threshold to identify zones where orientation change should not be trigerred.
+   */
+  @ScreenOrientation
+  private int toScreenOrientation(int rotation) {
+    // Sensor orientation 90 is equivalent to screen orientation 270 and vice versa. This
+    // function returns the screen orientation. So we convert sensor rotation 90 to 270 and
+    // vice versa here.
+    if (isInLeftRange(rotation, SCREEN_ORIENTATION_360, ROTATION_THRESHOLD)
+        || isInRightRange(rotation, SCREEN_ORIENTATION_0, ROTATION_THRESHOLD)) {
+      return SCREEN_ORIENTATION_0;
+    } else if (isWithinThreshold(rotation, SCREEN_ORIENTATION_90, ROTATION_THRESHOLD)) {
+      return SCREEN_ORIENTATION_270;
+    } else if (isWithinThreshold(rotation, SCREEN_ORIENTATION_180, ROTATION_THRESHOLD)) {
+      return SCREEN_ORIENTATION_180;
+    } else if (isWithinThreshold(rotation, SCREEN_ORIENTATION_270, ROTATION_THRESHOLD)) {
+      return SCREEN_ORIENTATION_90;
+    }
+    return SCREEN_ORIENTATION_UNKNOWN;
+  }
+}