Update settings for app hibernation

Created an preference in Apps & Notifcations page as the entry point for
apps that are hibernated. Also added a switch preference in AppInfo page
for users to exempt an app from hibernation.

Bug: 181172051
Test: HibernatedAppsPreferenceControllerTest;
HibernationSwitchPreferenceControllerTest;
AppInfoDashboardFragmentTest

Change-Id: I72a90ab391cd521150fc155a6d9c67c846b7360d

tests/unit/src/com/android/settings/applications/HibernatedAppsPreferenceControllerTest.java

@@ -0,0 +1,63 @@
+/*
+ * 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 android.provider.DeviceConfig.NAMESPACE_APP_HIBERNATION;
+
+import static com.android.settings.Utils.PROPERTY_APP_HIBERNATION_ENABLED;
+import static com.android.settings.core.BasePreferenceController.AVAILABLE;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.spy;
+
+import android.content.Context;
+import android.provider.DeviceConfig;
+
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/**
+ * TODO(b/181172051): test getNumberHibernated() when the API implemented
+ */
+@RunWith(AndroidJUnit4.class)
+public class HibernatedAppsPreferenceControllerTest {
+
+    private static final String KEY = "key";
+    private Context mContext;
+    private HibernatedAppsPreferenceController mController;
+
+    @Before
+    public void setUp() {
+        DeviceConfig.setProperty(NAMESPACE_APP_HIBERNATION, PROPERTY_APP_HIBERNATION_ENABLED,
+                "true", false);
+        mContext = spy(ApplicationProvider.getApplicationContext());
+        mController = new HibernatedAppsPreferenceController(mContext, KEY);
+    }
+
+    @Test
+    public void getAvailabilityStatus_featureDisabled_shouldNotReturnAvailable() {
+        DeviceConfig.setProperty(NAMESPACE_APP_HIBERNATION, PROPERTY_APP_HIBERNATION_ENABLED,
+                "false", true);
+
+        assertThat((mController).getAvailabilityStatus()).isNotEqualTo(AVAILABLE);
+    }
+}

tests/unit/src/com/android/settings/applications/appinfo/HibernationSwitchPreferenceControllerTest.java

@@ -0,0 +1,146 @@
+/*
+ * 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.appinfo;
+
+import static android.app.AppOpsManager.MODE_ALLOWED;
+import static android.app.AppOpsManager.MODE_DEFAULT;
+import static android.app.AppOpsManager.MODE_IGNORED;
+import static android.app.AppOpsManager.OPSTR_AUTO_REVOKE_PERMISSIONS_IF_UNUSED;
+import static android.provider.DeviceConfig.NAMESPACE_APP_HIBERNATION;
+
+import static com.android.settings.Utils.PROPERTY_APP_HIBERNATION_ENABLED;
+import static com.android.settings.core.BasePreferenceController.AVAILABLE;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.app.AppOpsManager;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.provider.DeviceConfig;
+
+import androidx.preference.SwitchPreference;
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+@RunWith(AndroidJUnit4.class)
+public class HibernationSwitchPreferenceControllerTest {
+    private static final int PACKAGE_UID = 1;
+    private static final String INVALID_PACKAGE_NAME = "invalid_package";
+    private static final String KEY = "key";
+    private static final String VALID_PACKAGE_NAME = "package";
+    private static final String EXEMPTED_PACKAGE_NAME = "exempted_package";
+    private static final String UNEXEMPTED_PACKAGE_NAME = "unexempted_package";
+    @Mock
+    private AppOpsManager mAppOpsManager;
+    @Mock
+    private PackageManager mPackageManager;
+    @Mock
+    private SwitchPreference mPreference;
+
+    private HibernationSwitchPreferenceController mController;
+    private Context mContext;
+
+    @Before
+    public void setUp() throws PackageManager.NameNotFoundException {
+        MockitoAnnotations.initMocks(this);
+        mContext = spy(ApplicationProvider.getApplicationContext());
+        when(mContext.getSystemService(Context.APP_OPS_SERVICE)).thenReturn(mAppOpsManager);
+        when(mPackageManager.getPackageUidAsUser(eq(VALID_PACKAGE_NAME), anyInt()))
+                .thenReturn(PACKAGE_UID);
+        when(mPackageManager.getPackageUidAsUser(eq(INVALID_PACKAGE_NAME), anyInt()))
+                .thenThrow(new PackageManager.NameNotFoundException());
+        when(mPackageManager.getTargetSdkVersion(eq(EXEMPTED_PACKAGE_NAME)))
+                .thenReturn(android.os.Build.VERSION_CODES.Q);
+        when(mPackageManager.getTargetSdkVersion(eq(UNEXEMPTED_PACKAGE_NAME)))
+                .thenReturn(android.os.Build.VERSION_CODES.S);
+        when(mContext.getPackageManager()).thenReturn(mPackageManager);
+        DeviceConfig.setProperty(NAMESPACE_APP_HIBERNATION, PROPERTY_APP_HIBERNATION_ENABLED,
+                "true", true /* makeDefault */);
+        mController = new HibernationSwitchPreferenceController(mContext, KEY);
+        when(mPreference.getKey()).thenReturn(mController.getPreferenceKey());
+    }
+
+    @Test
+    public void getAvailabilityStatus_featureNotEnabled_shouldNotReturnAvailable() {
+        mController.setPackage(VALID_PACKAGE_NAME);
+        DeviceConfig.setProperty(NAMESPACE_APP_HIBERNATION, PROPERTY_APP_HIBERNATION_ENABLED,
+                "false", true /* makeDefault */);
+
+        assertThat(mController.getAvailabilityStatus()).isNotEqualTo(AVAILABLE);
+    }
+
+    @Test
+    public void getAvailabilityStatus_invalidPackage_shouldReturnNotAvailable() {
+        mController.setPackage(INVALID_PACKAGE_NAME);
+
+        assertThat(mController.getAvailabilityStatus()).isNotEqualTo(AVAILABLE);
+    }
+
+    @Test
+    public void getAvailabilityStatus_validPackage_shouldReturnAvailable() {
+        mController.setPackage(VALID_PACKAGE_NAME);
+
+        assertThat(mController.getAvailabilityStatus()).isEqualTo(AVAILABLE);
+    }
+
+    @Test
+    public void updateState_exemptedByDefaultPackage_shouldNotCheck() {
+        when(mAppOpsManager.unsafeCheckOpNoThrow(
+                eq(OPSTR_AUTO_REVOKE_PERMISSIONS_IF_UNUSED), anyInt(), eq(EXEMPTED_PACKAGE_NAME)))
+                .thenReturn(MODE_DEFAULT);
+        mController.setPackage(EXEMPTED_PACKAGE_NAME);
+
+        mController.updateState(mPreference);
+
+        verify(mPreference).setChecked(false);
+    }
+
+    @Test
+    public void updateState_exemptedPackageOverrideByUser_shouldCheck() {
+        when(mAppOpsManager.unsafeCheckOpNoThrow(
+                eq(OPSTR_AUTO_REVOKE_PERMISSIONS_IF_UNUSED), anyInt(), eq(EXEMPTED_PACKAGE_NAME)))
+                .thenReturn(MODE_ALLOWED);
+        mController.setPackage(EXEMPTED_PACKAGE_NAME);
+
+        mController.updateState(mPreference);
+
+        verify(mPreference).setChecked(true);
+    }
+
+    @Test
+    public void updateState_unexemptedPackageOverrideByUser_shouldNotCheck() {
+        when(mAppOpsManager.unsafeCheckOpNoThrow(
+                eq(OPSTR_AUTO_REVOKE_PERMISSIONS_IF_UNUSED), anyInt(), eq(UNEXEMPTED_PACKAGE_NAME)))
+                .thenReturn(MODE_IGNORED);
+        mController.setPackage(UNEXEMPTED_PACKAGE_NAME);
+
+        mController.updateState(mPreference);
+
+        verify(mPreference).setChecked(false);
+    }
+}