Merge "SensorEventListener: Clarify documentation." into nyc-dev

am: 7d3a9e5259

* commit '7d3a9e525943705c7a6dca11929cfba29b2a24c1':
  SensorEventListener: Clarify documentation.

core/java/android/hardware/SensorEventListener.java

@@ -18,28 +18,33 @@ package android.hardware;
 
 /**
  * Used for receiving notifications from the SensorManager when
- * sensor values have changed.
+ * there is new sensor data.
  */
 public interface SensorEventListener {
 
     /**
-     * Called when sensor values have changed.
+     * Called when there is a new sensor event.  Note that "on changed"
+     * is somewhat of a misnomer, as this will also be called if we have a
+     * new reading from a sensor with the exact same sensor values (but a
+     * newer timestamp).
+     *
      * <p>See {@link android.hardware.SensorManager SensorManager}
      * for details on possible sensor types.
      * <p>See also {@link android.hardware.SensorEvent SensorEvent}.
-     * 
+     *
      * <p><b>NOTE:</b> The application doesn't own the
      * {@link android.hardware.SensorEvent event}
      * object passed as a parameter and therefore cannot hold on to it.
      * The object may be part of an internal pool and may be reused by
      * the framework.
      *
-     * @param event the {@link android.hardware.SensorEvent SensorEvent}. 
+     * @param event the {@link android.hardware.SensorEvent SensorEvent}.
      */
     public void onSensorChanged(SensorEvent event);
 
     /**
-     * Called when the accuracy of the registered sensor has changed.
+     * Called when the accuracy of the registered sensor has changed.  Unlike
+     * onSensorChanged(), this is only called when this accuracy value changes.
      *
      * <p>See the SENSOR_STATUS_* constants in
      * {@link android.hardware.SensorManager SensorManager} for details.