Adding sample code to HG

We're adding a simple sample code on how to use the Haptic Generator in the class javadoc.

Bug: 395070772
Flag: EXEMPT updating javadocs
Test: N/A
Change-Id: I07d9a7f62357d3af284e1d204a6a27d81698e6d1
diff --git a/media/java/android/media/audiofx/HapticGenerator.java b/media/java/android/media/audiofx/HapticGenerator.java
index d2523ef..7f94dde 100644
--- a/media/java/android/media/audiofx/HapticGenerator.java
+++ b/media/java/android/media/audiofx/HapticGenerator.java
@@ -36,6 +36,20 @@
  * <p>See {@link android.media.MediaPlayer#getAudioSessionId()} for details on audio sessions.
  * <p>See {@link android.media.audiofx.AudioEffect} class for more details on controlling audio
  * effects.
+ *
+ * <pre>{@code
+ * AudioManager audioManager = context.getSystemService(AudioManager.class);
+ * player = MediaPlayer.create(
+ *         context,
+ *         audioUri,
+ *         new AudioAttributes.Builder().setHapticChannelsMuted(false).build(),
+ *         audioManager.generateAudioSessionId()
+ * );
+ * if (HapticGenerator.isAvailable()) {
+ *     HapticGenerator.create(player.getAudioSessionId()).setEnabled(true);
+ * }
+ * player.start();
+ * }</pre>
  */
 public class HapticGenerator extends AudioEffect implements AutoCloseable {