Adding the ability to customize the subtitle on an unavailable slice

When a slice is depending on some setting and the setting is off,
it shows "depends on another setting".
Add an new attribute for Preference to customize the subtitle when
a slice is unavailable.

Bug: 118399193
Test: Robo test on com.android.settings.slices, com.android.settings.core
Change-Id: I84a8400295b36abb357e5baf98e9be3a8d6ea897

src/com/android/settings/slices/SlicesDatabaseAccessor.java

@@ -50,6 +50,7 @@ public class SlicesDatabaseAccessor {
             IndexColumns.PLATFORM_SLICE,
             IndexColumns.SLICE_TYPE,
             IndexColumns.ALLOW_DYNAMIC_SUMMARY_IN_SLICE,
+            IndexColumns.UNAVAILABLE_SLICE_SUBTITLE,
     };
 
     // Cursor value for boolean true
@@ -167,6 +168,8 @@ public class SlicesDatabaseAccessor {
                 cursor.getColumnIndex(IndexColumns.ALLOW_DYNAMIC_SUMMARY_IN_SLICE)) == TRUE;
         int sliceType = cursor.getInt(
                 cursor.getColumnIndex(IndexColumns.SLICE_TYPE));
+        final String unavailableSliceSubtitle = cursor.getString(
+                cursor.getColumnIndex(IndexColumns.UNAVAILABLE_SLICE_SUBTITLE));
 
         if (isIntentOnly) {
             sliceType = SliceData.SliceType.INTENT;
@@ -185,6 +188,7 @@ public class SlicesDatabaseAccessor {
                 .setPlatformDefined(isPlatformDefined)
                 .setSliceType(sliceType)
                 .setDynamicSummaryAllowed(isDynamicSummaryAllowed)
+                .setUnavailableSliceSubtitle(unavailableSliceSubtitle)
                 .build();
     }