UiTranslation: Temporary fix for crash due to length increases.

Ellipsizes the translated text if it's longer than the view text. This
fixes a crash in apps that operate on the view text based on layout
calculations made on the transformed text.

A proper fix will follow to modify the UiTranslationManger API to make
this compat behavior happen only on request, and probably change the
behavior to instead add padding to the view text to make it match the
translated text length.

Bug: 179693024
Test: atest CtsTranslationTestCases
Change-Id: I685ae4a9752c817db81f0d736f1d746b2e4a9839

1 files changed, 13 insertions, 0 deletions

diff --git a/core/java/android/text/method/TranslationTransformationMethod.java b/core/java/android/text/method/TranslationTransformationMethod.java
index 54c0ffcdbb65..7db999a89fbe 100644
--- a/core/java/android/text/method/TranslationTransformationMethod.java
+++ b/core/java/android/text/method/TranslationTransformationMethod.java
@@ -78,11 +78,24 @@ public class TranslationTransformationMethod implements TransformationMethod2 {
         if (TextUtils.isEmpty(translatedText) || isWhitespace(translatedText.toString())) {
             return source;
         } else {
+            // TODO(b/179693024): Remove this once we have the fix to pad the view text instead.
+            translatedText = ellipsize(translatedText, ((TextView) view).getText().length());
             // TODO(b/174283799): apply the spans to the text
             return translatedText;
         }
     }
 
+    private static CharSequence ellipsize(CharSequence text, int newLength) {
+        if (text.length() <= newLength) {
+            return text;
+        }
+        String ellipsis = String.valueOf('\u2026');
+        if (newLength == 1) {
+            return ellipsis;
+        }
+        return TextUtils.concat(TextUtils.trimToSize(text, newLength - 1), ellipsis);
+    }
+
     @Override
     public void onFocusChanged(View view, CharSequence sourceText,
             boolean focused, int direction,