Revert "Revert "Replace dynamic summary text for SettingPref""

This reverts commit 8061aaef62.
Test: make RunSettingsRoboTests
Fixes: 36101902
Change-Id: Ide74780153fc7f36d897f559c7a3c138190e3320

src/com/android/settings/notification/SettingPref.java

@@ -121,6 +121,19 @@ public class SettingPref {
         if (mTwoState != null) {
             mTwoState.setChecked(val != 0);
         } else if (mDropDown != null) {
+            if (mValues != null) {
+                int index = 0;
+                for (int len = mValues.length; index < len; index++) {
+                    if (mValues[index] == val) {
+                        break;
+                    }
+                }
+
+                if (index < mValues.length) {
+                    CharSequence entry = mDropDown.getEntries()[index];
+                    mDropDown.setSummary(entry);
+                }
+            }
             mDropDown.setValue(Integer.toString(val));
         }
     }