Merge "Add a filter to take out unnecessary homepage data."

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

@@ -16,13 +16,21 @@
 
 package com.android.settings.homepage;
 
+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.deviceinfo.DataUsageSlice;
 import com.android.settings.homepage.deviceinfo.DeviceInfoSlice;
@@ -31,6 +39,7 @@ import com.android.settingslib.utils.AsyncLoaderCompat;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.stream.Collectors;
 
 public class CardContentLoader extends AsyncLoaderCompat<List<ContextualCard>> {
     private static final String TAG = "CardContentLoader";
@@ -59,18 +68,18 @@ public class CardContentLoader extends AsyncLoaderCompat<List<ContextualCard>> {
         try (Cursor cursor = getContextualCardsFromProvider()) {
             if (cursor.getCount() == 0) {
                 result.addAll(createStaticCards());
-                return result;
-            }
-            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);
+            } 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 result;
+        return filter(result);
     }
 
     @VisibleForTesting
@@ -95,15 +104,15 @@ public class CardContentLoader extends AsyncLoaderCompat<List<ContextualCard>> {
                     .build());
             //TODO(b/115971399): Will change following values of SliceUri and Name
             // after landing these slice cards.
-            add(new ContextualCard.Builder()
-                    .setSliceUri("content://com.android.settings.slices/intent/battery_card")
-                    .setName(packageName + "/" + "battery_card")
-                    .setPackageName(packageName)
-                    .setRankingScore(rankingScore)
-                    .setAppVersion(appVersionCode)
-                    .setCardType(ContextualCard.CardType.SLICE)
-                    .setIsHalfWidth(true)
-                    .build());
+//            add(new ContextualCard.Builder()
+//                    .setSliceUri("content://com.android.settings.slices/battery_card")
+//                    .setName(packageName + "/" + "battery_card")
+//                    .setPackageName(packageName)
+//                    .setRankingScore(rankingScore)
+//                    .setAppVersion(appVersionCode)
+//                    .setCardType(ContextualCard.CardType.SLICE)
+//                    .setIsHalfWidth(true)
+//                    .build());
             add(new ContextualCard.Builder()
                     .setSliceUri(DeviceInfoSlice.DEVICE_INFO_CARD_URI.toString())
                     .setName(packageName + "/" + DeviceInfoSlice.PATH_DEVICE_INFO_CARD)
@@ -126,6 +135,41 @@ public class CardContentLoader extends AsyncLoaderCompat<List<ContextualCard>> {
         return result;
     }
 
+    @VisibleForTesting
+    List<ContextualCard> filter(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)) {
+            return false;
+        }
+
+        return true;
+    }
+
     private long getAppVersionCode() {
         try {
             return mContext.getPackageManager().getPackageInfo(mContext.getPackageName(),