Add StrikethroughSpan support to SpannedToHtmlConverter

PiperOrigin-RevId: 310332708

library/ui/src/main/java/com/google/android/exoplayer2/ui/SpannedToHtmlConverter.java

@@ -23,6 +23,7 @@ import android.text.style.AbsoluteSizeSpan;
 import android.text.style.BackgroundColorSpan;
 import android.text.style.ForegroundColorSpan;
 import android.text.style.RelativeSizeSpan;
+import android.text.style.StrikethroughSpan;
 import android.text.style.StyleSpan;
 import android.text.style.TypefaceSpan;
 import android.text.style.UnderlineSpan;
@@ -128,7 +129,9 @@ import java.util.regex.Pattern;
 
   @Nullable
   private static String getOpeningTag(Object span, float displayDensity) {
-    if (span instanceof ForegroundColorSpan) {
+    if (span instanceof StrikethroughSpan) {
+      return "<span style='text-decoration:line-through;'>";
+    } else if (span instanceof ForegroundColorSpan) {
       ForegroundColorSpan colorSpan = (ForegroundColorSpan) span;
       return Util.formatInvariant(
           "<span style='color:%s;'>", HtmlUtils.toCssRgba(colorSpan.getForegroundColor()));
@@ -186,7 +189,8 @@ import java.util.regex.Pattern;
 
   @Nullable
   private static String getClosingTag(Object span) {
-    if (span instanceof ForegroundColorSpan
+    if (span instanceof StrikethroughSpan
+        || span instanceof ForegroundColorSpan
         || span instanceof BackgroundColorSpan
         || span instanceof HorizontalTextInVerticalContextSpan
         || span instanceof AbsoluteSizeSpan

library/ui/src/test/java/com/google/android/exoplayer2/ui/SpannedToHtmlConverterTest.java

@@ -26,6 +26,7 @@ import android.text.style.AbsoluteSizeSpan;
 import android.text.style.BackgroundColorSpan;
 import android.text.style.ForegroundColorSpan;
 import android.text.style.RelativeSizeSpan;
+import android.text.style.StrikethroughSpan;
 import android.text.style.StyleSpan;
 import android.text.style.TypefaceSpan;
 import android.text.style.UnderlineSpan;
@@ -177,6 +178,22 @@ public class SpannedToHtmlConverterTest {
   }
 
   @Test
+  public void convert_supportsStrikethroughSpan() {
+    SpannableString spanned = new SpannableString("String with crossed-out section");
+    spanned.setSpan(
+        new StrikethroughSpan(),
+        "String with ".length(),
+        "String with crossed-out".length(),
+        Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+
+    String html = SpannedToHtmlConverter.convert(spanned, displayDensity);
+
+    assertThat(html)
+        .isEqualTo(
+            "String with <span style='text-decoration:line-through;'>crossed-out</span> section");
+  }
+
+  @Test
   public void convert_supportsStyleSpan() {
     SpannableString spanned =
         new SpannableString("String with bold, italic and bold-italic sections.");