Make number in dialog highlighted

Bug: 28787910

Change-Id: Idf6767156c0a3dafffb62b9a41ee81f6a9712a2f
(cherry picked from commit c54973b8d838b97f508fd519444d954fdb30dd4f)
diff --git a/src/com/android/settings/datausage/BillingCycleSettings.java b/src/com/android/settings/datausage/BillingCycleSettings.java
index e9aa8c9..482703b 100644
--- a/src/com/android/settings/datausage/BillingCycleSettings.java
+++ b/src/com/android/settings/datausage/BillingCycleSettings.java
@@ -198,10 +198,16 @@
             final long limitDisabled = isLimit ? LIMIT_DISABLED : WARNING_DISABLED;
 
             if (bytes > 1.5f * GB_IN_BYTES) {
-                bytesPicker.setText(formatText(bytes / (float) GB_IN_BYTES));
+                final String bytesText = formatText(bytes / (float) GB_IN_BYTES);
+                bytesPicker.setText(bytesText);
+                bytesPicker.setSelection(0, bytesText.length());
+
                 type.setSelection(1);
             } else {
-                bytesPicker.setText(formatText(bytes / (float) MB_IN_BYTES));
+                final String bytesText = formatText(bytes / (float) MB_IN_BYTES);
+                bytesPicker.setText(bytesText);
+                bytesPicker.setSelection(0, bytesText.length());
+
                 type.setSelection(0);
             }
         }