Add credential management app preference to Settings

Background
* This is part of the work to support
  a credential management app on
  unmanaged devices.
Changes
* Add a preference controller which will only
  be enabled if there is a credential management app.
* Add a fragment to display details on the credential
  management app and its policy. Add a remove button
  to remove the credential management app.
* Link CredentialManagementAppAdapter to new fragment
  and add expander.

Manual Testing
* Verify preference is disabled if there is no credential
  management app.
* Verify preference summary shows credential mangement
  app name if a credential management app exists.
* Verify fragment details page displays the
  authentication policy correctly.

Bug: 165641221
Test: Manual testing
      make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.security.CredentialManagementAppFragmentTest
      make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.security.CredentialManagementAppControllerTest
Change-Id: I06d6b88d0c89022f7a6cbf3031834defcb54bd51

tests/robotests/src/com/android/settings/security/CredentialManagementAppButtonsControllerTest.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2020 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.security;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+
+import com.android.settings.core.BasePreferenceController;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+
+@RunWith(RobolectricTestRunner.class)
+public class CredentialManagementAppButtonsControllerTest {
+
+    private Context mContext;
+    private CredentialManagementAppButtonsController mController;
+
+    private static final String PREF_KEY_CREDENTIAL_MANAGEMENT_APP = "certificate_management_app";
+
+    @Before
+    public void setUp() {
+        mContext = RuntimeEnvironment.application;
+        mController = new CredentialManagementAppButtonsController(
+                mContext, PREF_KEY_CREDENTIAL_MANAGEMENT_APP);
+    }
+
+    @Test
+    public void getAvailabilityStatus_shouldAlwaysReturnAvailableUnsearchable() {
+        assertThat(mController.getAvailabilityStatus())
+                .isEqualTo(BasePreferenceController.AVAILABLE_UNSEARCHABLE);
+    }
+}

tests/robotests/src/com/android/settings/security/CredentialManagementAppControllerTest.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2020 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.security;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+
+import androidx.preference.Preference;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+
+@RunWith(RobolectricTestRunner.class)
+public class CredentialManagementAppControllerTest {
+
+    private Context mContext;
+    private CredentialManagementAppPreferenceController mController;
+    private Preference mPreference;
+
+    private static final String PREF_KEY_CREDENTIAL_MANAGEMENT_APP = "certificate_management_app";
+
+    @Before
+    public void setUp() {
+        mContext = RuntimeEnvironment.application;
+        mController = new CredentialManagementAppPreferenceController(
+                mContext, PREF_KEY_CREDENTIAL_MANAGEMENT_APP);
+        mPreference = new Preference(mContext);
+    }
+
+    @Test
+    public void getAvailabilityStatus_shouldAlwaysReturnAvailable() {
+        assertThat(mController.getAvailabilityStatus())
+                .isEqualTo(BasePreferenceController.AVAILABLE);
+    }
+
+    @Test
+    public void updateState_noCredentialManagementApp_shouldDisablePreference() {
+        mController.updateState(mPreference);
+
+        assertThat(mPreference.isEnabled()).isEqualTo(false);
+        assertThat(mPreference.getSummary()).isEqualTo(
+                mContext.getText(R.string.no_certificate_management_app));
+    }
+}

tests/robotests/src/com/android/settings/security/CredentialManagementAppFragmentTest.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2020 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.security;
+
+import static android.app.settings.SettingsEnums.CREDENTIAL_MANAGEMENT_APP;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.spy;
+
+import android.content.Context;
+import android.provider.SearchIndexableResource;
+
+import com.android.settings.R;
+import com.android.settings.testutils.shadow.ShadowDashboardFragment;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+import java.util.List;
+
+@RunWith(RobolectricTestRunner.class)
+@Config(shadows = ShadowDashboardFragment.class)
+public class CredentialManagementAppFragmentTest {
+
+    private CredentialManagementAppFragment mFragment;
+    private Context mContext;
+
+    @Before
+    public void setUp() throws Exception {
+        MockitoAnnotations.initMocks(this);
+        mContext = spy(RuntimeEnvironment.application);
+        mFragment = spy(new CredentialManagementAppFragment());
+
+        doReturn(mContext).when(mFragment).getContext();
+    }
+
+    @Test
+    public void searchIndexProvider_shouldIndexResource() {
+        final List<SearchIndexableResource> indexRes =
+                CredentialManagementAppFragment.SEARCH_INDEX_DATA_PROVIDER
+                        .getXmlResourcesToIndex(mContext, true /* enabled */);
+
+        assertThat(indexRes).isNotNull();
+        assertThat(indexRes.get(0).xmlResId).isEqualTo(R.xml.credential_management_app_fragment);
+    }
+
+    @Test
+    public void getMetricsCategory_shouldReturnInstallCertificateFromStorage() {
+        assertThat(mFragment.getMetricsCategory()).isEqualTo(CREDENTIAL_MANAGEMENT_APP);
+    }
+}

tests/robotests/src/com/android/settings/security/CredentialManagementAppHeaderControllerTest.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2020 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.security;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+
+import com.android.settings.core.BasePreferenceController;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+
+@RunWith(RobolectricTestRunner.class)
+public class CredentialManagementAppHeaderControllerTest {
+
+    private Context mContext;
+    private CredentialManagementAppHeaderController mController;
+
+    private static final String PREF_KEY_CREDENTIAL_MANAGEMENT_APP = "certificate_management_app";
+
+    @Before
+    public void setUp() {
+        mContext = RuntimeEnvironment.application;
+        mController = new CredentialManagementAppHeaderController(
+                mContext, PREF_KEY_CREDENTIAL_MANAGEMENT_APP);
+    }
+
+    @Test
+    public void getAvailabilityStatus_shouldAlwaysReturnAvailableUnsearchable() {
+        assertThat(mController.getAvailabilityStatus())
+                .isEqualTo(BasePreferenceController.AVAILABLE_UNSEARCHABLE);
+    }
+}