Merge "Set upper-limit for the single line edit text." into rvc-qpr-dev

core/java/android/widget/TextView.java

@@ -395,6 +395,9 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
     private static final int EMS = LINES;
     private static final int PIXELS = 2;
 
+    // Maximum text length for single line input.
+    private static final int MAX_LENGTH_FOR_SINGLE_LINE_EDIT_TEXT = 5000;
+
     private static final RectF TEMP_RECTF = new RectF();
 
     /** @hide */
@@ -1633,6 +1636,12 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
             setTransformationMethod(PasswordTransformationMethod.getInstance());
         }
 
+        // For addressing b/145128646
+        // For the performance reason, we limit characters for single line text field.
+        if (bufferType == BufferType.EDITABLE && singleLine && maxlength == -1) {
+            maxlength = MAX_LENGTH_FOR_SINGLE_LINE_EDIT_TEXT;
+        }
+
         if (maxlength >= 0) {
             setFilters(new InputFilter[] { new InputFilter.LengthFilter(maxlength) });
         } else {

core/res/res/values/attrs.xml

@@ -1259,7 +1259,12 @@
         <!-- Can be combined with <var>text</var> and its variations to
              allow multiple lines of text in the field.  If this flag is not set,
              the text field will be constrained to a single line.  Corresponds to
-             {@link android.text.InputType#TYPE_TEXT_FLAG_MULTI_LINE}. -->
+             {@link android.text.InputType#TYPE_TEXT_FLAG_MULTI_LINE}.
+
+             Note: If this flag is not set and the text field doesn't have max length limit, the
+             framework automatically set maximum length of the characters to 5000 for the
+             performance reasons.
+             -->
         <flag name="textMultiLine" value="0x00020001" />
         <!-- Can be combined with <var>text</var> and its variations to
              indicate that though the regular text view should not be multiple