Add 12dp padding above the first slice item

-Add an extra padding in adapter for dedicated panels
-Add test cases

Bug: 154181365
Test: manual test
make -j50 RunSettingsRoboTests
"adb shell am start -a android.settings.panel.action.INTERNET_CONNECTIVITY"

Change-Id: I65bc26c23ca5a7f1b433c36ac7ddf1a658793719

res/layout/panel_slice_slider_row.xml

@@ -16,6 +16,7 @@
 -->
 <LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/slice_slider_layout"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:orientation="vertical">

res/values/dimens.xml

@@ -427,4 +427,7 @@
 
     <!-- Developer options shared data screens related dimensions -->
     <dimen name="list_preferred_item_padding">16dp</dimen>
+
+    <!-- Output switcher panel related dimensions -->
+    <dimen name="output_switcher_slice_padding_top">12dp</dimen>
 </resources>

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

@@ -16,7 +16,9 @@
 
 package com.android.settings.panel;
 
+import static com.android.settings.slices.CustomSliceRegistry.MEDIA_OUTPUT_GROUP_SLICE_URI;
 import static com.android.settings.slices.CustomSliceRegistry.MEDIA_OUTPUT_INDICATOR_SLICE_URI;
+import static com.android.settings.slices.CustomSliceRegistry.MEDIA_OUTPUT_SLICE_URI;
 
 import android.app.settings.SettingsEnums;
 import android.content.Context;
@@ -24,6 +26,7 @@ import android.net.Uri;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.LinearLayout;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.VisibleForTesting;
@@ -81,7 +84,7 @@ public class PanelSlicesAdapter
 
     @Override
     public void onBindViewHolder(@NonNull SliceRowViewHolder sliceRowViewHolder, int position) {
-        sliceRowViewHolder.onBind(mSliceLiveData.get(position));
+        sliceRowViewHolder.onBind(mSliceLiveData.get(position), position);
     }
 
     /**
@@ -116,15 +119,21 @@ public class PanelSlicesAdapter
 
         @VisibleForTesting
         final SliceView sliceView;
+        @VisibleForTesting
+        final LinearLayout mSliceSliderLayout;
 
         public SliceRowViewHolder(View view) {
             super(view);
             sliceView = view.findViewById(R.id.slice_view);
             sliceView.setMode(SliceView.MODE_LARGE);
             sliceView.setShowTitleItems(true);
+            mSliceSliderLayout = view.findViewById(R.id.slice_slider_layout);
         }
 
-        public void onBind(LiveData<Slice> sliceLiveData) {
+        /**
+         * Called when the view is displayed.
+         */
+        public void onBind(LiveData<Slice> sliceLiveData, int position) {
             sliceLiveData.observe(mPanelFragment.getViewLifecycleOwner(), sliceView);
 
             // Do not show the divider above media devices switcher slice per request
@@ -133,6 +142,16 @@ public class PanelSlicesAdapter
                 mDividerAllowedAbove = false;
             }
 
+            // Customize output switcher slice top padding
+            if (position == 0 && (slice.getUri().equals(MEDIA_OUTPUT_SLICE_URI)
+                    || slice.getUri().equals(MEDIA_OUTPUT_GROUP_SLICE_URI))) {
+                final int paddingTop = mPanelFragment.getResources().getDimensionPixelSize(
+                        R.dimen.output_switcher_slice_padding_top);
+                mSliceSliderLayout.setPadding(mSliceSliderLayout.getPaddingLeft(), paddingTop,
+                        mSliceSliderLayout.getPaddingRight(),
+                        mSliceSliderLayout.getPaddingBottom());
+            }
+
             // Log Panel interaction
             sliceView.setOnSliceActionListener(
                     ((eventInfo, sliceItem) -> {

tests/robotests/src/com/android/settings/panel/PanelSlicesAdapterTest.java

@@ -18,7 +18,9 @@ package com.android.settings.panel;
 
 import static com.android.settings.panel.PanelContent.VIEW_TYPE_SLIDER;
 import static com.android.settings.panel.PanelSlicesAdapter.MAX_NUM_OF_SLICES;
+import static com.android.settings.slices.CustomSliceRegistry.MEDIA_OUTPUT_GROUP_SLICE_URI;
 import static com.android.settings.slices.CustomSliceRegistry.MEDIA_OUTPUT_INDICATOR_SLICE_URI;
+import static com.android.settings.slices.CustomSliceRegistry.MEDIA_OUTPUT_SLICE_URI;
 
 import static com.google.common.truth.Truth.assertThat;
 
@@ -139,6 +141,58 @@ public class PanelSlicesAdapterTest {
         assertThat(viewHolder.isDividerAllowedAbove()).isFalse();
     }
 
+    @Test
+    public void outputSwitcherSlice_shouldAddFirstItemPadding() {
+        addTestLiveData(MEDIA_OUTPUT_SLICE_URI);
+
+        final PanelSlicesAdapter adapter =
+                new PanelSlicesAdapter(mPanelFragment, mData, 0 /* metrics category */);
+        final int position = 0;
+        final ViewGroup view = new FrameLayout(mContext);
+        final SliceRowViewHolder viewHolder =
+                adapter.onCreateViewHolder(view, 0 /* view type*/);
+
+        adapter.onBindViewHolder(viewHolder, position);
+
+        assertThat(viewHolder.mSliceSliderLayout.getPaddingTop()).isEqualTo(
+                mPanelFragment.getResources().getDimensionPixelSize(
+                        R.dimen.output_switcher_slice_padding_top));
+    }
+
+    @Test
+    public void outputSwitcherGroupSlice_shouldAddFirstItemPadding() {
+        addTestLiveData(MEDIA_OUTPUT_GROUP_SLICE_URI);
+
+        final PanelSlicesAdapter adapter =
+                new PanelSlicesAdapter(mPanelFragment, mData, 0 /* metrics category */);
+        final int position = 0;
+        final ViewGroup view = new FrameLayout(mContext);
+        final SliceRowViewHolder viewHolder =
+                adapter.onCreateViewHolder(view, 0 /* view type*/);
+
+        adapter.onBindViewHolder(viewHolder, position);
+
+        assertThat(viewHolder.mSliceSliderLayout.getPaddingTop()).isEqualTo(
+                mPanelFragment.getResources().getDimensionPixelSize(
+                        R.dimen.output_switcher_slice_padding_top));
+    }
+
+    @Test
+    public void mediaOutputIndicatorSlice_shouldNotAddFirstItemPadding() {
+        addTestLiveData(MEDIA_OUTPUT_INDICATOR_SLICE_URI);
+
+        final PanelSlicesAdapter adapter =
+                new PanelSlicesAdapter(mPanelFragment, mData, 0 /* metrics category */);
+        final int position = 0;
+        final ViewGroup view = new FrameLayout(mContext);
+        final SliceRowViewHolder viewHolder =
+                adapter.onCreateViewHolder(view, 0 /* view type*/);
+
+        adapter.onBindViewHolder(viewHolder, position);
+
+        assertThat(viewHolder.mSliceSliderLayout.getPaddingTop()).isEqualTo(0);
+    }
+
     @Test
     public void onCreateViewHolder_viewTypeSlider_verifyLayout() {
         final PanelSlicesAdapter adapter =