Make Splitter.splitToStream available to Android users.

RELNOTES=`base`: Made `Splitter.splitToStream` available to Android users.
PiperOrigin-RevId: 687039853

Author: cpovirk

android/guava-tests/test/com/google/common/base/SplitterTest.java

@@ -17,6 +17,7 @@
 package com.google.common.base;
 
 import static com.google.common.base.ReflectionFreeAssertThrows.assertThrows;
+import static com.google.common.collect.ImmutableList.toImmutableList;
 import static com.google.common.truth.Truth.assertThat;
 
 import com.google.common.annotations.GwtCompatible;
@@ -63,6 +64,12 @@ public void testCharacterSimpleSplitToList() {
     assertThat(letters).containsExactly("a", "b", "c").inOrder();
   }
 
+  public void testCharacterSimpleSplitToStream() {
+    String simple = "a,b,c";
+    List<String> letters = COMMA_SPLITTER.splitToStream(simple).collect(toImmutableList());
+    assertThat(letters).containsExactly("a", "b", "c").inOrder();
+  }
+
   public void testToString() {
     assertEquals("[]", COMMA_SPLITTER.split("").toString());
     assertEquals("[a, b, c]", COMMA_SPLITTER.split("a,b,c").toString());

android/guava/src/com/google/common/base/Splitter.java

@@ -26,6 +26,8 @@
 import java.util.List;
 import java.util.Map;
 import java.util.regex.Pattern;
+import java.util.stream.Stream;
+import java.util.stream.StreamSupport;
 import javax.annotation.CheckForNull;
 
 /**
@@ -423,6 +425,23 @@ public List<String> splitToList(CharSequence sequence) {
     return Collections.unmodifiableList(result);
   }
 
+  /**
+   * Splits {@code sequence} into string components and makes them available through an {@link
+   * Stream}, which may be lazily evaluated. If you want an eagerly computed {@link List}, use
+   * {@link #splitToList(CharSequence)}.
+   *
+   * @param sequence the sequence of characters to split
+   * @return a stream over the segments split from the parameter
+   * @since NEXT (but since 28.2 in the JRE flavor)
+   */
+  @SuppressWarnings("Java7ApiChecker")
+  // If users use this when they shouldn't, we hope that NewApi will catch subsequent Stream calls.
+  @IgnoreJRERequirement
+  public Stream<String> splitToStream(CharSequence sequence) {
+    // Can't use Streams.stream() from base
+    return StreamSupport.stream(split(sequence).spliterator(), false);
+  }
+
   /**
    * Returns a {@code MapSplitter} which splits entries based on this splitter, and splits entries
    * into keys and values using the specified separator.

guava/src/com/google/common/base/Splitter.java

@@ -432,7 +432,7 @@ public List<String> splitToList(CharSequence sequence) {
    *
    * @param sequence the sequence of characters to split
    * @return a stream over the segments split from the parameter
-   * @since 28.2
+   * @since 28.2 (but only since 33.4.0 in the Android flavor)
    */
   public Stream<String> splitToStream(CharSequence sequence) {
     // Can't use Streams.stream() from base