Create the main architecture for Settings Dynamic Homepage

Create an architecture for the homepage to enable card adding
and displaying.

Bug: 111676964
Test: robotests
Change-Id: I06efe3d16585060a8e99313586ae29bbde7fe3e8

res/layout/dashboard.xml

@@ -26,5 +26,4 @@
     android:paddingEnd="@dimen/dashboard_padding_end"
     android:paddingTop="@dimen/dashboard_padding_top"
     android:paddingBottom="@dimen/dashboard_padding_bottom"
-    android:scrollbars="vertical"/>
+    android:scrollbars="vertical"/>
-

src/com/android/settings/homepage/CardContentLoader.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2018 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.homepage;
+
+import android.content.Context;
+
+import androidx.annotation.Nullable;
+
+import com.android.settingslib.utils.AsyncLoaderCompat;
+
+import java.util.List;
+
+//TODO(b/112521307): Implement this to make it work with the card database.
+public class CardContentLoader {
+
+    private static final String TAG = "CardContentLoader";
+
+    private CardContentLoaderListener mListener;
+
+    public interface CardContentLoaderListener {
+        void onFinishCardLoading(List<HomepageCard> homepageCards);
+    }
+
+    public CardContentLoader() {
+    }
+
+    void setListener(CardContentLoaderListener listener) {
+        mListener = listener;
+    }
+
+    private static class CardLoader extends AsyncLoaderCompat<List<HomepageCard>> {
+
+        public CardLoader(Context context) {
+            super(context);
+        }
+
+        @Override
+        protected void onDiscardResult(List<HomepageCard> result) {
+
+        }
+
+        @Nullable
+        @Override
+        public List<HomepageCard> loadInBackground() {
+            return null;
+        }
+    }
+}

src/com/android/settings/homepage/ControllerRendererPool.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2018 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.homepage;
+
+import android.content.Context;
+import android.util.Log;
+
+import androidx.collection.ArraySet;
+
+import java.util.Set;
+
+/**
+ * This is a fragment scoped singleton holding a set of {@link HomepageCardController} and
+ * {@link HomepageCardRenderer}.
+ */
+public class ControllerRendererPool {
+
+    private static final String TAG = "ControllerRendererPool";
+
+    private final Set<HomepageCardController> mControllers;
+    private final Set<HomepageCardRenderer> mRenderers;
+
+    public ControllerRendererPool() {
+        mControllers = new ArraySet<>();
+        mRenderers = new ArraySet<>();
+    }
+
+    public <T extends HomepageCardController> T getController(Context context,
+            @HomepageCard.CardType int cardType) {
+        final Class<? extends HomepageCardController> clz =
+                HomepageCardLookupTable.getCardControllerClass(cardType);
+        for (HomepageCardController controller : mControllers) {
+            if (controller.getClass() == clz) {
+                Log.d(TAG, "Controller is already there.");
+                return (T) controller;
+            }
+        }
+
+        final HomepageCardController controller = createCardController(context, clz);
+        if (controller != null) {
+            mControllers.add(controller);
+        }
+        return (T) controller;
+    }
+
+    public Set<HomepageCardController> getControllers() {
+        return mControllers;
+    }
+
+    public HomepageCardRenderer getRenderer(Context context, @HomepageCard.CardType int cardType) {
+        final Class<? extends HomepageCardRenderer> clz =
+                HomepageCardLookupTable.getCardRendererClasses(cardType);
+        for (HomepageCardRenderer renderer : mRenderers) {
+            if (renderer.getClass() == clz) {
+                Log.d(TAG, "Renderer is already there.");
+                return renderer;
+            }
+        }
+
+        final HomepageCardRenderer renderer = createCardRenderer(context, clz);
+        if (renderer != null) {
+            mRenderers.add(renderer);
+        }
+        return renderer;
+    }
+
+    private HomepageCardController createCardController(Context context,
+            Class<? extends HomepageCardController> clz) {
+        /*
+        if (ConditionHomepageCardController.class == clz) {
+            return new ConditionHomepageCardController(context);
+        }
+        */
+        return null;
+    }
+
+    private HomepageCardRenderer createCardRenderer(Context context, Class<?> clz) {
+        //if (ConditionHomepageCardRenderer.class == clz) {
+        //    return new ConditionHomepageCardRenderer(context, this /*controllerRendererPool*/);
+        //}
+
+        return null;
+    }
+
+}

src/com/android/settings/homepage/HomepageAdapter.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2018 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.homepage;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.recyclerview.widget.RecyclerView;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class HomepageAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements
+        HomepageCardUpdateListener {
+
+    private static final String TAG = "HomepageAdapter";
+
+    private final Context mContext;
+    private final ControllerRendererPool mControllerRendererPool;
+
+    private List<HomepageCard> mHomepageCards;
+    private RecyclerView mRecyclerView;
+
+    public HomepageAdapter(Context context, HomepageManager manager) {
+        mContext = context;
+        mHomepageCards = new ArrayList<>();
+        mControllerRendererPool = manager.getControllerRendererPool();
+        setHasStableIds(true);
+    }
+
+    @Override
+    public long getItemId(int position) {
+        return mHomepageCards.get(position).hashCode();
+    }
+
+    @Override
+    public int getItemViewType(int position) {
+        return mHomepageCards.get(position).getCardType();
+    }
+
+    @Override
+    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int cardType) {
+        final HomepageCardRenderer renderer = mControllerRendererPool.getRenderer(mContext, cardType);
+        final int viewType = renderer.getViewType();
+        final View view = LayoutInflater.from(parent.getContext()).inflate(viewType, parent, false);
+
+        return renderer.createViewHolder(view);
+    }
+
+    @Override
+    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
+        final int cardType = mHomepageCards.get(position).getCardType();
+        final HomepageCardRenderer renderer = mControllerRendererPool.getRenderer(mContext, cardType);
+
+        renderer.bindView(holder, mHomepageCards.get(position));
+    }
+
+    @Override
+    public int getItemCount() {
+        return mHomepageCards.size();
+    }
+
+    @Override
+    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
+        super.onAttachedToRecyclerView(recyclerView);
+        mRecyclerView = recyclerView;
+    }
+
+    @Override
+    public void onHomepageCardUpdated(int cardType, List<HomepageCard> homepageCards) {
+        //TODO(b/112245748): Should implement a DiffCallback so we can use notifyItemChanged()
+        // instead.
+        if (homepageCards == null) {
+            mHomepageCards.clear();
+        } else {
+            mHomepageCards = homepageCards;
+        }
+        notifyDataSetChanged();
+    }
+}

src/com/android/settings/homepage/HomepageCard.java

@@ -0,0 +1,296 @@
+/*
+ * Copyright (C) 2018 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.homepage;
+
+import android.annotation.IntDef;
+import android.graphics.drawable.Drawable;
+import android.net.Uri;
+import android.text.TextUtils;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+/**
+ * Data class representing a {@link HomepageCard}.
+ */
+public class HomepageCard {
+
+    /**
+     * Flags indicating the type of the HomepageCard.
+     */
+    @IntDef({CardType.INVALID, CardType.SLICE, CardType.SUGGESTION, CardType.CONDITIONAL})
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface CardType {
+        int INVALID = -1;
+        int SLICE = 1;
+        int SUGGESTION = 2;
+        int CONDITIONAL = 3;
+    }
+
+    private final String mName;
+    @CardType
+    private final int mCardType;
+    private final double mScore;
+    private final String mSliceUri;
+    private final int mCategory;
+    private final String mLocalizedToLocale;
+    private final String mPackageName;
+    private final String mAppVersion;
+    private final String mTitleResName;
+    private final String mTitleText;
+    private final String mSummaryResName;
+    private final String mSummaryText;
+    private final String mIconResName;
+    private final int mIconResId;
+    private final String mCardAction;
+    private final long mExpireTimeMS;
+    private final Drawable mDrawable;
+    private final boolean mSupportHalfWidth;
+
+    String getName() {
+        return mName;
+    }
+
+    int getCardType() {
+        return mCardType;
+    }
+
+    double getScore() {
+        return mScore;
+    }
+
+    String getTextSliceUri() {
+        return mSliceUri;
+    }
+
+    Uri getSliceUri() {
+        return Uri.parse(mSliceUri);
+    }
+
+    int getCategory() {
+        return mCategory;
+    }
+
+    String getLocalizedToLocale() {
+        return mLocalizedToLocale;
+    }
+
+    String getPackageName() {
+        return mPackageName;
+    }
+
+    String getAppVersion() {
+        return mAppVersion;
+    }
+
+    String getTitleResName() {
+        return mTitleResName;
+    }
+
+    String getTitleText() {
+        return mTitleText;
+    }
+
+    String getSummaryResName() {
+        return mSummaryResName;
+    }
+
+    String getSummaryText() {
+        return mSummaryText;
+    }
+
+    String getIconResName() {
+        return mIconResName;
+    }
+
+    int getIconResId() {
+        return mIconResId;
+    }
+
+    String getCardAction() {
+        return mCardAction;
+    }
+
+    long getExpireTimeMS() {
+        return mExpireTimeMS;
+    }
+
+    Drawable getDrawable() {
+        return mDrawable;
+    }
+
+    boolean getSupportHalfWidth() {
+        return mSupportHalfWidth;
+    }
+
+    HomepageCard(Builder builder) {
+        mName = builder.mName;
+        mCardType = builder.mCardType;
+        mScore = builder.mScore;
+        mSliceUri = builder.mSliceUri;
+        mCategory = builder.mCategory;
+        mLocalizedToLocale = builder.mLocalizedToLocale;
+        mPackageName = builder.mPackageName;
+        mAppVersion = builder.mAppVersion;
+        mTitleResName = builder.mTitleResName;
+        mTitleText = builder.mTitleText;
+        mSummaryResName = builder.mSummaryResName;
+        mSummaryText = builder.mSummaryText;
+        mIconResName = builder.mIconResName;
+        mIconResId = builder.mIconResId;
+        mCardAction = builder.mCardAction;
+        mExpireTimeMS = builder.mExpireTimeMS;
+        mDrawable = builder.mDrawable;
+        mSupportHalfWidth = builder.mSupportHalfWidth;
+    }
+
+    @Override
+    public int hashCode() {
+        return mName.hashCode();
+    }
+
+    /**
+     * Note that {@link #mName} is treated as a primary key for this class and determines equality.
+     */
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (!(obj instanceof HomepageCard)) {
+            return false;
+        }
+        final HomepageCard that = (HomepageCard) obj;
+
+        return TextUtils.equals(mName, that.mName);
+    }
+
+    static class Builder {
+        private String mName;
+        private int mCardType;
+        private double mScore;
+        private String mSliceUri;
+        private int mCategory;
+        private String mLocalizedToLocale;
+        private String mPackageName;
+        private String mAppVersion;
+        private String mTitleResName;
+        private String mTitleText;
+        private String mSummaryResName;
+        private String mSummaryText;
+        private String mIconResName;
+        private int mIconResId;
+        private String mCardAction;
+        private long mExpireTimeMS;
+        private Drawable mDrawable;
+        private boolean mSupportHalfWidth;
+
+        public Builder setName(String name) {
+            mName = name;
+            return this;
+        }
+
+        public Builder setCardType(int cardType) {
+            mCardType = cardType;
+            return this;
+        }
+
+        public Builder setScore(double score) {
+            mScore = score;
+            return this;
+        }
+
+        public Builder setSliceUri(String sliceUri) {
+            mSliceUri = sliceUri;
+            return this;
+        }
+
+        public Builder setCategory(int category) {
+            mCategory = category;
+            return this;
+        }
+
+        public Builder setLocalizedToLocale(String localizedToLocale) {
+            mLocalizedToLocale = localizedToLocale;
+            return this;
+        }
+
+        public Builder setPackageName(String packageName) {
+            mPackageName = packageName;
+            return this;
+        }
+
+        public Builder setAppVersion(String appVersion) {
+            mAppVersion = appVersion;
+            return this;
+        }
+
+        public Builder setTitleResName(String titleResName) {
+            mTitleResName = titleResName;
+            return this;
+        }
+
+        public Builder setTitleText(String titleText) {
+            mTitleText = titleText;
+            return this;
+        }
+
+        public Builder setSummaryResName(String summaryResName) {
+            mSummaryResName = summaryResName;
+            return this;
+        }
+
+        public Builder setSummaryText(String summaryText) {
+            mSummaryText = summaryText;
+            return this;
+        }
+
+        public Builder setIconResName(String iconResName) {
+            mIconResName = iconResName;
+            return this;
+        }
+
+        public Builder setIconResId(int iconResId) {
+            mIconResId = iconResId;
+            return this;
+        }
+
+        public Builder setCardAction(String cardAction) {
+            mCardAction = cardAction;
+            return this;
+        }
+
+        public Builder setExpireTimeMS(long expireTimeMS) {
+            mExpireTimeMS = expireTimeMS;
+            return this;
+        }
+
+        public Builder setDrawable(Drawable drawable) {
+            mDrawable = drawable;
+            return this;
+        }
+
+        public Builder setSupportHalfWidth(boolean supportHalfWidth) {
+            mSupportHalfWidth = supportHalfWidth;
+            return this;
+        }
+
+        public HomepageCard build() {
+            return new HomepageCard(this);
+        }
+    }
+}

src/com/android/settings/homepage/HomepageCardController.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2018 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.homepage;
+
+import com.android.settingslib.core.lifecycle.Lifecycle;
+
+import java.util.List;
+
+//TODO(b/111821137): add test cases
+/**
+ * Data controller for {@link HomepageCard}.
+ */
+public interface HomepageCardController {
+
+    @HomepageCard.CardType
+    int getCardType();
+
+    /**
+     * When data is updated or changed, the new data should be passed to HomepageManager for list
+     * updating.
+     */
+    void onDataUpdated(List<HomepageCard> cardList);
+
+    void onPrimaryClick(HomepageCard card);
+
+    void onActionClick(HomepageCard card);
+
+    void setLifecycle(Lifecycle lifecycle);
+
+    void setHomepageCardUpdateListener(HomepageCardUpdateListener listener);
+}

src/com/android/settings/homepage/HomepageCardLookupTable.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2018 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.homepage;
+
+import com.android.settings.homepage.HomepageCard.CardType;
+
+import java.util.Set;
+import java.util.TreeSet;
+
+public class HomepageCardLookupTable {
+
+    static class HomepageMapping implements Comparable<HomepageMapping> {
+        @CardType
+        private final int mCardType;
+        private final Class<? extends HomepageCardController> mControllerClass;
+        private final Class<? extends HomepageCardRenderer> mRendererClass;
+
+        private HomepageMapping(@CardType int cardType,
+                Class<? extends HomepageCardController> controllerClass,
+                Class<? extends HomepageCardRenderer> rendererClass) {
+            mCardType = cardType;
+            mControllerClass = controllerClass;
+            mRendererClass = rendererClass;
+        }
+
+        @Override
+        public int compareTo(HomepageMapping other) {
+            return Integer.compare(this.mCardType, other.mCardType);
+        }
+    }
+
+    private static final Set<HomepageMapping> LOOKUP_TABLE = new TreeSet<HomepageMapping>() {
+        {
+            //add(new HomepageMapping(CardType.CONDITIONAL, ConditionHomepageCardController.class,
+                   // ConditionHomepageCardRenderer.class));
+        }
+    };
+
+    public static Class<? extends HomepageCardController> getCardControllerClass(
+            @CardType int cardType) {
+        for (HomepageMapping mapping : LOOKUP_TABLE) {
+            if (mapping.mCardType == cardType) {
+                return mapping.mControllerClass;
+            }
+        }
+        return null;
+    }
+
+    //TODO(b/112578070): Implement multi renderer cases.
+    public static Class<? extends HomepageCardRenderer> getCardRendererClasses(
+            @CardType int cardType) {
+        for (HomepageMapping mapping : LOOKUP_TABLE) {
+            if (mapping.mCardType == cardType) {
+                return mapping.mRendererClass;
+            }
+        }
+        return null;
+    }
+}

src/com/android/settings/homepage/HomepageCardRenderer.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2018 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.homepage;
+
+import android.view.View;
+
+import androidx.recyclerview.widget.RecyclerView;
+
+/**
+ * UI renderer for {@link HomepageCard}.
+ */
+public interface HomepageCardRenderer {
+
+    /**
+     * The layout type of the controller.
+     */
+    int getViewType();
+
+    /**
+     * When {@link HomepageAdapter} calls {@link HomepageAdapter#onCreateViewHolder(ViewGroup,
+     * int)}, this method will be called to retrieve the corresponding
+     * {@link androidx.recyclerview.widget.RecyclerView.ViewHolder}.
+     */
+    RecyclerView.ViewHolder createViewHolder(View view);
+
+    /**
+     * When {@link HomepageAdapter} calls {@link HomepageAdapter#onBindViewHolder(RecyclerView
+     * .ViewHolder, int)}, this method will be called to bind data to the
+     * {@link androidx.recyclerview.widget.RecyclerView.ViewHolder}.
+     */
+    void bindView(RecyclerView.ViewHolder holder, HomepageCard card);
+}

src/com/android/settings/homepage/HomepageCardUpdateListener.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2018 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.homepage;
+
+import java.util.List;
+
+/**
+ * When {@link HomepageCardController} detects changes, it will notify the listeners registered. In
+ * our case, {@link HomepageManager} gets noticed.
+ *
+ * After the list of {@link HomepageCard} gets updated in{@link HomepageManager},
+ * {@link HomepageManager} will notify the listeners registered, {@link HomepageAdapter} in this
+ * case.
+ */
+interface HomepageCardUpdateListener {
+    void onHomepageCardUpdated(int cardType, List<HomepageCard> updateList);
+}

src/com/android/settings/homepage/HomepageFragment.java

@@ -48,6 +48,7 @@ public class HomepageFragment extends InstrumentedFragment {
     private static final String SAVE_BOTTOM_FRAGMENT_LOADED = "bottom_fragment_loaded";
 
     private RecyclerView mCardsContainer;
+    private HomepageAdapter mHomepageAdapter;
     private LinearLayoutManager mLayoutManager;
 
     private FloatingActionButton mSearchButton;
@@ -55,6 +56,14 @@ public class HomepageFragment extends InstrumentedFragment {
     private View mBottomBar;
     private View mSearchBar;
     private boolean mBottomFragmentLoaded;
+    private HomepageManager mHomepageManager;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        mHomepageManager = new HomepageManager(getContext(), getSettingsLifecycle());
+        mHomepageManager.startCardContentLoading();
+    }
 
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
@@ -65,6 +74,9 @@ public class HomepageFragment extends InstrumentedFragment {
         //TODO(b/111822407): May have to swap to GridLayoutManager
         mLayoutManager = new LinearLayoutManager(getActivity());
         mCardsContainer.setLayoutManager(mLayoutManager);
+        mHomepageAdapter = new HomepageAdapter(getContext(), mHomepageManager);
+        mCardsContainer.setAdapter(mHomepageAdapter);
+        mHomepageManager.setListener(mHomepageAdapter);
 
         return rootView;
     }

src/com/android/settings/homepage/HomepageManager.java

@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2018 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.homepage;
+
+import android.content.Context;
+import android.widget.BaseAdapter;
+
+import com.android.settingslib.core.lifecycle.Lifecycle;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * This is a centralized manager of multiple {@link HomepageCardController}.
+ *
+ * {@link HomepageManager} first loads data from {@link CardContentLoader} and gets back a list of
+ * {@link HomepageCard}. All subclasses of {@link HomepageCardController} are loaded here, which
+ * will then trigger the {@link HomepageCardController} to load its data and listen to
+ * corresponding changes. When every single {@link HomepageCardController} updates its data, the
+ * data will be passed here, then going through some sorting mechanisms. The
+ * {@link HomepageCardController} will end up building a list of {@link HomepageCard} for {@link
+ * HomepageAdapter} and {@link BaseAdapter#notifyDataSetChanged()} will be called to get the page
+ * refreshed.
+ */
+public class HomepageManager implements CardContentLoader.CardContentLoaderListener,
+        HomepageCardUpdateListener {
+
+    private static final String TAG = "HomepageManager";
+    //The list for Settings Custom Card
+    @HomepageCard.CardType
+    private static final int[] SETTINGS_CARDS = {HomepageCard.CardType.CONDITIONAL};
+
+    private final Context mContext;
+    private final ControllerRendererPool mControllerRendererPool;
+    private final Lifecycle mLifecycle;
+
+    private List<HomepageCard> mHomepageCards;
+    private HomepageCardUpdateListener mListener;
+
+
+    public HomepageManager(Context context, Lifecycle lifecycle) {
+        mContext = context;
+        mLifecycle = lifecycle;
+        mHomepageCards = new ArrayList<>();
+        mControllerRendererPool = new ControllerRendererPool();
+    }
+
+    void startCardContentLoading() {
+        final CardContentLoader cardContentLoader = new CardContentLoader();
+        cardContentLoader.setListener(this);
+    }
+
+    private void loadCardControllers() {
+        if (mHomepageCards != null) {
+            for (HomepageCard card : mHomepageCards) {
+                setupController(card.getCardType());
+            }
+        }
+
+        //for data provided by Settings
+        for (int cardType : SETTINGS_CARDS) {
+            setupController(cardType);
+        }
+    }
+
+    private void setupController(int cardType) {
+        final HomepageCardController controller = mControllerRendererPool.getController(mContext,
+                cardType);
+        if (controller != null) {
+            controller.setHomepageCardUpdateListener(this);
+            controller.setLifecycle(mLifecycle);
+        }
+    }
+
+    //TODO(b/111822376): implement sorting mechanism.
+    private void sortCards() {
+        //take mHomepageCards as the source and do the ranking based on the rule.
+    }
+
+    @Override
+    public void onHomepageCardUpdated(int cardType, List<HomepageCard> updateList) {
+        //TODO(b/112245748): Should implement a DiffCallback.
+        //Keep the old list for comparison.
+        final List<HomepageCard> prevCards = mHomepageCards;
+
+        //Remove the existing data that matches the certain cardType so as to insert the new data.
+        for (int i = mHomepageCards.size() - 1; i >= 0; i--) {
+            if (mHomepageCards.get(i).getCardType() == cardType) {
+                mHomepageCards.remove(i);
+            }
+        }
+
+        //Append the new data
+        mHomepageCards.addAll(updateList);
+
+        sortCards();
+
+        if (mListener != null) {
+            mListener.onHomepageCardUpdated(HomepageCard.CardType.INVALID, mHomepageCards);
+        }
+    }
+
+    @Override
+    public void onFinishCardLoading(List<HomepageCard> homepageCards) {
+        mHomepageCards = homepageCards;
+
+        //Force card sorting here in case CardControllers of custom view have nothing to update
+        // for the first launch.
+        sortCards();
+
+        loadCardControllers();
+    }
+
+    void setListener(HomepageCardUpdateListener listener) {
+        mListener = listener;
+    }
+
+    public ControllerRendererPool getControllerRendererPool() {
+        return mControllerRendererPool;
+    }
+}