1 files changed, 17 insertions, 0 deletions
diff --git a/core/java/android/util/SparseArray.java b/core/java/android/util/SparseArray.java
index 6e6609051aae..6e168a8b4ccd 100644
--- a/core/java/android/util/SparseArray.java
+++ b/core/java/android/util/SparseArray.java
@@ -39,6 +39,12 @@ import com.android.internal.util.ArrayUtils;
  * a single garbage collection step of all removed entries.  This garbage collection will
  * need to be performed at any time the array needs to be grown or the the map size or
  * entry values are retrieved.</p>
+ *
+ * <p>It is possible to iterate over the items in this container using
+ * {@link #keyAt(int)} and {@link #valueAt(int)}. Iterating over the keys using
+ * <code>keyAt(int)</code> with ascending values of the index will return the
+ * keys in ascending order, or the values corresponding to the keys in ascending
+ * order in the case of <code>valueAt(int)<code>.</p>
  */
 public class SparseArray<E> implements Cloneable {
     private static final Object DELETED = new Object();
@@ -251,6 +257,11 @@ public class SparseArray<E> implements Cloneable {
      * Given an index in the range <code>0...size()-1</code>, returns
      * the key from the <code>index</code>th key-value mapping that this
      * SparseArray stores.
+     *
+     * <p>The keys corresponding to indices in ascending order are guaranteed to
+     * be in ascending order, e.g., <code>keyAt(0)</code> will return the
+     * smallest key and <code>keyAt(size()-1)</code> will return the largest
+     * key.</p>
      */
     public int keyAt(int index) {
         if (mGarbage) {
@@ -264,6 +275,12 @@ public class SparseArray<E> implements Cloneable {
      * Given an index in the range <code>0...size()-1</code>, returns
      * the value from the <code>index</code>th key-value mapping that this
      * SparseArray stores.
+     *
+     * <p>The values corresponding to indices in ascending order are guaranteed
+     * to be associated with keys in ascending order, e.g.,
+     * <code>valueAt(0)</code> will return the value associated with the
+     * smallest key and <code>valueAt(size()-1)</code> will return the value
+     * associated with the largest key.</p>
      */
     @SuppressWarnings("unchecked")
     public E valueAt(int index) {