Update dropdown colors and list readability for SearchView.

Dismiss IME on launching suggestion.

core/java/android/widget/ListPopupWindow.java

@@ -1119,6 +1119,8 @@ public class ListPopupWindow {
         public DropDownListView(Context context, boolean hijackFocus) {
             super(context, null, com.android.internal.R.attr.dropDownListViewStyle);
             mHijackFocus = hijackFocus;
+            // TODO: Add an API to control this
+            setCacheColorHint(0); // Transparent, since the background drawable could be anything.
         }
 
         /**

core/java/android/widget/SearchView.java

@@ -717,6 +717,7 @@ public class SearchView extends LinearLayout {
             if (mOnSuggestionListener == null
                     || !mOnSuggestionListener.onSuggestionClicked(position)) {
                 launchSuggestion(position, KeyEvent.KEYCODE_UNKNOWN, null);
+                setImeVisibility(false);
                 dismissSuggestions();
             }
         }