Move a11y indexing from DynamicContentMonitor to loader

This is necessary to kill DynamicContentMonitor later

- Removed all logic related to indexing accesiblitysetting from the
  monitor class and AccessibilitySetting page itself
- Created a loader to search against A11yServices at runtime

I noticed adding a loader in SearchResultsAdapter is rather manual. It's
something we should consider refactor in the future.

Bug: 64310452
Test: robotests
Change-Id: Iff31aff65ce000991229433f294e2ec69af99da2

src/com/android/settings/search/AccessibilityServiceResultLoader.java

@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2017 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.search;
+
+import static com.android.settings.search.InstalledAppResultLoader.getWordDifference;
+
+import android.accessibilityservice.AccessibilityServiceInfo;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.content.pm.ServiceInfo;
+import android.graphics.drawable.Drawable;
+import android.support.annotation.VisibleForTesting;
+import android.support.v4.content.ContextCompat;
+import android.view.accessibility.AccessibilityManager;
+
+import com.android.settings.R;
+import com.android.settings.accessibility.AccessibilitySettings;
+import com.android.settings.dashboard.SiteMapManager;
+import com.android.settings.utils.AsyncLoader;
+
+import java.util.HashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+
+public class AccessibilityServiceResultLoader extends AsyncLoader<Set<? extends SearchResult>> {
+
+    private static final int NAME_NO_MATCH = -1;
+
+    private List<String> mBreadcrumb;
+    private SiteMapManager mSiteMapManager;
+    @VisibleForTesting
+    final String mQuery;
+    private final AccessibilityManager mAccessibilityManager;
+    private final PackageManager mPackageManager;
+
+
+    public AccessibilityServiceResultLoader(Context context, String query,
+            SiteMapManager mapManager) {
+        super(context);
+        mSiteMapManager = mapManager;
+        mPackageManager = context.getPackageManager();
+        mAccessibilityManager =
+                (AccessibilityManager) context.getSystemService(Context.ACCESSIBILITY_SERVICE);
+        mQuery = query;
+    }
+
+    @Override
+    public Set<? extends SearchResult> loadInBackground() {
+        final Set<SearchResult> results = new HashSet<>();
+        final Context context = getContext();
+        final List<AccessibilityServiceInfo> services = mAccessibilityManager
+                .getInstalledAccessibilityServiceList();
+        final String screenTitle = context.getString(R.string.accessibility_settings);
+        for (AccessibilityServiceInfo service : services) {
+            if (service == null) {
+                continue;
+            }
+            final ResolveInfo resolveInfo = service.getResolveInfo();
+            if (service.getResolveInfo() == null) {
+                continue;
+            }
+            final ServiceInfo serviceInfo = resolveInfo.serviceInfo;
+            final CharSequence title = resolveInfo.loadLabel(mPackageManager);
+            final int wordDiff = getWordDifference(title.toString(), mQuery);
+            if (wordDiff == NAME_NO_MATCH) {
+                continue;
+            }
+            final Drawable icon;
+            if (resolveInfo.getIconResource() == 0) {
+                icon = ContextCompat.getDrawable(context, R.mipmap.ic_accessibility_generic);
+            } else {
+                icon = resolveInfo.loadIcon(mPackageManager);
+            }
+            final String componentName = new ComponentName(serviceInfo.packageName,
+                    serviceInfo.name).flattenToString();
+            final Intent intent = DatabaseIndexingUtils.buildSubsettingIntent(context,
+                    AccessibilitySettings.class.getName(), componentName, screenTitle);
+
+            results.add(new SearchResult.Builder()
+                    .setTitle(title)
+                    .addBreadcrumbs(getBreadCrumb())
+                    .setPayload(new ResultPayload(intent))
+                    .setRank(wordDiff)
+                    .setIcon(icon)
+                    .setStableId(Objects.hash(screenTitle, componentName))
+                    .build());
+        }
+        return results;
+    }
+
+    private List<String> getBreadCrumb() {
+        if (mBreadcrumb == null || mBreadcrumb.isEmpty()) {
+            final Context context = getContext();
+            mBreadcrumb = mSiteMapManager.buildBreadCrumb(
+                    context, AccessibilitySettings.class.getName(),
+                    context.getString(R.string.accessibility_settings));
+        }
+        return mBreadcrumb;
+    }
+
+    @Override
+    protected void onDiscardResult(Set<? extends SearchResult> result) {
+
+    }
+}