Move all contextual card related classes.

... from homepage to contextualcards.

Test: rebuild
Change-Id: Id7889566ce1e7257eb699d963ae996906fdb58ff

src/com/android/settings/homepage/contextualcards/ContextualCardLoader.java

@@ -0,0 +1,171 @@
+/*
+ * 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.contextualcards;
+
+import static android.app.slice.Slice.HINT_ERROR;
+
+import static androidx.slice.widget.SliceLiveData.SUPPORTED_SPECS;
+
+import android.content.ContentProviderClient;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.database.Cursor;
+import android.net.Uri;
+import android.util.Log;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.VisibleForTesting;
+import androidx.slice.Slice;
+
+import com.android.settings.homepage.contextualcards.deviceinfo.BatterySlice;
+import com.android.settings.homepage.contextualcards.deviceinfo.DataUsageSlice;
+import com.android.settings.homepage.contextualcards.deviceinfo.DeviceInfoSlice;
+import com.android.settingslib.utils.AsyncLoaderCompat;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class ContextualCardLoader extends AsyncLoaderCompat<List<ContextualCard>> {
+    private static final String TAG = "ContextualCardLoader";
+    static final int CARD_CONTENT_LOADER_ID = 1;
+
+    private Context mContext;
+
+    public interface CardContentLoaderListener {
+        void onFinishCardLoading(List<ContextualCard> contextualCards);
+    }
+
+    ContextualCardLoader(Context context) {
+        super(context);
+        mContext = context.getApplicationContext();
+    }
+
+    @Override
+    protected void onDiscardResult(List<ContextualCard> result) {
+
+    }
+
+    @NonNull
+    @Override
+    public List<ContextualCard> loadInBackground() {
+        final List<ContextualCard> result = new ArrayList<>();
+        try (Cursor cursor = getContextualCardsFromProvider()) {
+            if (cursor.getCount() == 0) {
+                result.addAll(createStaticCards());
+            } else {
+                for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
+                    final ContextualCard card = new ContextualCard(cursor);
+                    if (card.isCustomCard()) {
+                        //TODO(b/114688391): Load and generate custom card,then add into list
+                    } else {
+                        result.add(card);
+                    }
+                }
+            }
+        }
+        return filterEligibleCards(result);
+    }
+
+    @VisibleForTesting
+    Cursor getContextualCardsFromProvider() {
+        return CardDatabaseHelper.getInstance(mContext).getContextualCards();
+    }
+
+    @VisibleForTesting
+    List<ContextualCard> createStaticCards() {
+        final long appVersionCode = getAppVersionCode();
+        final String packageName = mContext.getPackageName();
+        final double rankingScore = 0.0;
+        final List<ContextualCard> result = new ArrayList();
+        result.add(new ContextualCard.Builder()
+                .setSliceUri(DataUsageSlice.DATA_USAGE_CARD_URI)
+                .setName(DataUsageSlice.PATH_DATA_USAGE)
+                .setPackageName(packageName)
+                .setRankingScore(rankingScore)
+                .setAppVersion(appVersionCode)
+                .setCardType(ContextualCard.CardType.SLICE)
+                .setIsHalfWidth(false)
+                .build());
+        result.add(new ContextualCard.Builder()
+                .setSliceUri(BatterySlice.BATTERY_CARD_URI)
+                .setName(BatterySlice.PATH_BATTERY_INFO)
+                .setPackageName(packageName)
+                .setRankingScore(rankingScore)
+                .setAppVersion(appVersionCode)
+                .setCardType(ContextualCard.CardType.SLICE)
+                .setIsHalfWidth(false)
+                .build());
+        result.add(new ContextualCard.Builder()
+                .setSliceUri(DeviceInfoSlice.DEVICE_INFO_CARD_URI)
+                .setName(DeviceInfoSlice.PATH_DEVICE_INFO)
+                .setPackageName(packageName)
+                .setRankingScore(rankingScore)
+                .setAppVersion(appVersionCode)
+                .setCardType(ContextualCard.CardType.SLICE)
+                .setIsHalfWidth(false)
+                .build());
+        return result;
+    }
+
+    @VisibleForTesting
+    List<ContextualCard> filterEligibleCards(List<ContextualCard> candidates) {
+        return candidates.stream().filter(card -> isCardEligibleToDisplay(card))
+                .collect(Collectors.toList());
+    }
+
+    @VisibleForTesting
+    boolean isCardEligibleToDisplay(ContextualCard card) {
+        if (card.isCustomCard()) {
+            return true;
+        }
+
+        final Uri uri = card.getSliceUri();
+
+        if (!ContentResolver.SCHEME_CONTENT.equals(uri.getScheme())) {
+            return false;
+        }
+
+        //check if the uri has a provider associated with.
+        final ContentProviderClient provider =
+                mContext.getContentResolver().acquireContentProviderClient(uri);
+        if (provider == null) {
+            return false;
+        }
+        //release contentProviderClient to prevent from memory leak.
+        provider.release();
+
+        final Slice slice = Slice.bindSlice(mContext, uri, SUPPORTED_SPECS);
+        if (slice == null || slice.hasHint(HINT_ERROR)) {
+            Log.w(TAG, "Failed to bind slice, not eligible for display " + uri);
+            return false;
+        }
+
+        return true;
+    }
+
+    private long getAppVersionCode() {
+        try {
+            return mContext.getPackageManager().getPackageInfo(mContext.getPackageName(),
+                    0 /* flags */).getLongVersionCode();
+        } catch (PackageManager.NameNotFoundException e) {
+            Log.e(TAG, "Invalid package name for context", e);
+        }
+        return -1L;
+    }
+}