Dream settings refactor.

We will be re-using the grid UI for the dream complication picker, so
this change refactors some of that logic so it can be re-used in the
complication controller.

We also update some of the UI here to match the most recent UX
decisions.

http://screen/BxhAwZwQSVoxUmN.png

Test: locally on device
Test: make -j64 RunSettingsRoboTests ROBOTEST_FILTER="com.android.settings.dream.DreamPickerControllerTest"
Bug: 214250590
Bug: 215703483
Change-Id: I9fbfa0f0cd31ae3d119c7cd1a9562d4cdb203d6c

src/com/android/settings/dream/DreamAdapter.java

@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.dream;
+
+import android.content.Context;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.VectorDrawable;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.android.settings.R;
+import com.android.settingslib.Utils;
+
+import java.util.List;
+
+/**
+ * RecyclerView adapter which displays list of items for the user to select.
+ */
+class DreamAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
+    private final List<IDreamItem> mItemList;
+
+    /**
+     * View holder for each {@link IDreamItem}.
+     */
+    private static class DreamViewHolder extends RecyclerView.ViewHolder {
+        private final ImageView mIconView;
+        private final TextView mTitleView;
+        private final ImageView mPreviewView;
+        private final Button mCustomizeButton;
+        private final Context mContext;
+
+        DreamViewHolder(View view, Context context) {
+            super(view);
+            mContext = context;
+            mPreviewView = view.findViewById(R.id.preview);
+            mIconView = view.findViewById(R.id.icon);
+            mTitleView = view.findViewById(R.id.title_text);
+            mCustomizeButton = view.findViewById(R.id.customize_button);
+        }
+
+        /**
+         * Bind the view at the given position, populating the view with the provided data.
+         */
+        public void bindView(IDreamItem item) {
+            mTitleView.setText(item.getTitle());
+            mPreviewView.setImageDrawable(item.getPreviewImage());
+
+            final Drawable icon = item.getIcon();
+            if (icon instanceof VectorDrawable) {
+                icon.setTint(Utils.getColorAttrDefaultColor(mContext,
+                        com.android.internal.R.attr.colorAccentPrimaryVariant));
+            }
+            mIconView.setImageDrawable(icon);
+            if (item.allowCustomization()) {
+                mCustomizeButton.setVisibility(View.VISIBLE);
+                mCustomizeButton.setOnClickListener(v -> item.onCustomizeClicked());
+            } else {
+                mCustomizeButton.setVisibility(View.GONE);
+            }
+            itemView.setOnClickListener(v -> item.onItemClicked());
+            itemView.setActivated(item.isActive());
+        }
+    }
+
+    DreamAdapter(List<IDreamItem> itemList) {
+        mItemList = itemList;
+    }
+
+    @NonNull
+    @Override
+    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int viewType) {
+        View view = LayoutInflater.from(viewGroup.getContext())
+                .inflate(R.layout.dream_preference_layout, viewGroup, false);
+        return new DreamViewHolder(view, viewGroup.getContext());
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int i) {
+        ((DreamViewHolder) viewHolder).bindView(mItemList.get(i));
+    }
+
+    @Override
+    public int getItemCount() {
+        return mItemList.size();
+    }
+}