Create a new apps page for silky home

- Change recent apps to the list view.
- Remove Conversations, Notifications and Permission manager.
- Remove Wireless emergency alerts and Special app access.
- Show App info preference if there's no recent apps.
- Show general category with recent apps.
- Use this page as the new apps entry on homepage for silky home.
- Make old apps page unsearchable when silky home is enabled.
- Exported new apps page in AndroidManifest.

Bug: 168166015
Bug: 174964405
Test: robotest & visual
Change-Id: I50d35a9d4723612214fce45a9e129fc175bc6831

tests/robotests/src/com/android/settings/applications/AppDashboardFragmentTest.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2021 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.applications;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+
+import com.android.settings.testutils.XmlTestUtils;
+import com.android.settings.testutils.shadow.ShadowUserManager;
+import com.android.settingslib.core.AbstractPreferenceController;
+import com.android.settingslib.drawer.CategoryKey;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@RunWith(RobolectricTestRunner.class)
+public class AppDashboardFragmentTest {
+
+    private Context mContext;
+    private AppDashboardFragment mFragment;
+
+    @Before
+    public void setUp() {
+        mContext = RuntimeEnvironment.application;
+        mFragment = new AppDashboardFragment();
+    }
+
+    @Test
+    public void testCategory_isApps() {
+        assertThat(mFragment.getCategoryKey()).isEqualTo(CategoryKey.CATEGORY_APPS);
+    }
+
+    @Test
+    @Config(shadows = ShadowUserManager.class)
+    public void testPreferenceControllers_existInPreferenceScreen() {
+        final List<String> preferenceScreenKeys = XmlTestUtils.getKeysFromPreferenceXml(mContext,
+                mFragment.getPreferenceScreenResId());
+        final List<String> preferenceKeys = new ArrayList<>();
+
+        for (AbstractPreferenceController controller : mFragment.createPreferenceControllers(
+                mContext)) {
+            preferenceKeys.add(controller.getPreferenceKey());
+        }
+
+        assertThat(preferenceScreenKeys).containsAtLeastElementsIn(preferenceKeys);
+    }
+}