Add a separate line at the bottom of list area in output switcher

-Bottom divider is not showed when there are more than 7 devices exist in output switcher
-Check panel type in isDividerAllowedBelow()
-Hide the Slice bottom divider of Output switcher panel
-Show divider in panel layout only for output switcher panel

Bug: 159177275
Test: make -j42 RunSettingsRoboTests

Change-Id: I49396a0ee0543b494a2b3d714ec248ebab08e7ba

src/com/android/settings/panel/PanelFragment.java

@@ -96,6 +96,7 @@ public class PanelFragment extends Fragment {
     private TextView mHeaderTitle;
     private TextView mHeaderSubtitle;
     private int mMaxHeight;
+    private View mFooterDivider;
 
     private final Map<Uri, LiveData<Slice>> mSliceLiveData = new LinkedHashMap<>();
 
@@ -187,6 +188,7 @@ public class PanelFragment extends Fragment {
         mTitleIcon = mLayoutView.findViewById(R.id.title_icon);
         mHeaderTitle = mLayoutView.findViewById(R.id.header_title);
         mHeaderSubtitle = mLayoutView.findViewById(R.id.header_subtitle);
+        mFooterDivider = mLayoutView.findViewById(R.id.footer_divider);
 
         // Make the panel layout gone here, to avoid janky animation when updating from old panel.
         // We will make it visible once the panel is ready to load.
@@ -241,6 +243,13 @@ public class PanelFragment extends Fragment {
                 mTitleIcon.setLayoutParams(new LinearLayout.LayoutParams(size, size));
             }
         }
+
+        if (mPanel.getViewType() == PanelContent.VIEW_TYPE_SLIDER_LARGE_ICON) {
+            mFooterDivider.setVisibility(View.VISIBLE);
+        } else {
+            mFooterDivider.setVisibility(View.GONE);
+        }
+
         mSeeMoreButton.setOnClickListener(getSeeMoreListener());
         mDoneButton.setOnClickListener(getCloseListener());