Create a preference controller for "App info"

We try to avoid managing too many preferences in a controller.
So, we create another controller to manage all apps info preference.

RecentAppsPreferenceController and AllAppsInfoPreferenceController
share same state of recent apps in order to improve the performance.

Test: visual, robo test
Fixes: 126134996
Change-Id: I1d8a175b213831415797437c64fd9d432864f9d3

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

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2019 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.android.settings.core.BasePreferenceController.AVAILABLE;
+import static com.android.settings.core.BasePreferenceController.CONDITIONALLY_UNAVAILABLE;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.app.usage.UsageStats;
+import android.content.Context;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@RunWith(RobolectricTestRunner.class)
+public class AllAppsInfoPreferenceControllerTest {
+
+    private AllAppsInfoPreferenceController mController;
+
+    @Before
+    public void setUp() {
+        final Context context = RuntimeEnvironment.application;
+        mController = new AllAppsInfoPreferenceController(context, "test_key");
+    }
+
+    @Test
+    public void getAvailabilityStatus_hasRecentApps_shouldReturnConditionallyUnavailable() {
+        final List<UsageStats> stats = new ArrayList<>();
+        final UsageStats stat1 = new UsageStats();
+        stat1.mLastTimeUsed = System.currentTimeMillis();
+        stat1.mPackageName = "pkg.class";
+        stats.add(stat1);
+        mController.setRecentApps(stats);
+
+        assertThat(mController.getAvailabilityStatus()).isEqualTo(CONDITIONALLY_UNAVAILABLE);
+    }
+
+    @Test
+    public void getAvailabilityStatus_noRecentApps_shouldReturnAvailable() {
+        // No data
+        assertThat(mController.getAvailabilityStatus()).isEqualTo(AVAILABLE);
+    }
+}