Introduce boolean flag to show/hide Reset Options.

This adds one new flag:
config_show_reset_dashboard

Which when set to false, will hide Reset Options from System settings.

Bug: 74127210
Test: Updated robotests
Change-Id: I42b14a0abde575f5c4e51985125e8543716d206a
(cherry picked from commit bd180a62ec)

res/values/bools.xml

@@ -153,6 +153,9 @@
     <!-- Whether assist_and_voice_input should be shown or not. -->
     <bool name="config_show_assist_and_voice_input">true</bool>
 
+    <!-- Whether reset_dashboard should be shown or not. -->
+    <bool name="config_show_reset_dashboard">true</bool>
+
     <!-- Whether system_update_settings should be shown or not. -->
     <bool name="config_show_system_update_settings">true</bool>
 

res/xml/system_dashboard_fragment.xml

@@ -46,7 +46,8 @@
         android:summary="@string/reset_dashboard_summary"
         android:icon="@drawable/ic_restore"
         android:order="-50"
-        android:fragment="com.android.settings.system.ResetDashboardFragment" />
+        android:fragment="com.android.settings.system.ResetDashboardFragment"
+        settings:controller="com.android.settings.system.ResetPreferenceController"/>
 
     <!-- System updates -->
     <Preference

src/com/android/settings/system/ResetPreferenceController.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2018 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.system;
+
+import android.content.Context;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+public class ResetPreferenceController extends BasePreferenceController {
+
+    public ResetPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return mContext.getResources().getBoolean(R.bool.config_show_reset_dashboard)
+                ? AVAILABLE
+                : DISABLED_UNSUPPORTED;
+    }
+}

tests/robotests/res/values-mcc999/config.xml

@@ -54,6 +54,7 @@
     <bool name="config_show_tts_settings_summary">false</bool>
     <bool name="config_show_pointer_speed">false</bool>
     <bool name="config_show_vibrate_input_devices">false</bool>
+    <bool name="config_show_reset_dashboard">false</bool>
     <bool name="config_show_system_update_settings">false</bool>
     <bool name="config_wifi_support_connected_mac_randomization">false</bool>
     <bool name="config_show_device_model">false</bool>

tests/robotests/src/com/android/settings/system/ResetPreferenceControllerTest.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2016 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.system;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+public class ResetPreferenceControllerTest {
+
+    private static final String KEY_RESET_DASHBOARD = "reset_dashboard";
+
+    private Context mContext;
+    private ResetPreferenceController mController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = RuntimeEnvironment.application;
+        mController = new ResetPreferenceController(mContext, KEY_RESET_DASHBOARD);
+    }
+
+    @Test
+    public void isAvailable_byDefault_true() {
+        assertThat(mController.isAvailable()).isTrue();
+    }
+
+    @Test
+    @Config(qualifiers = "mcc999")
+    public void isAvailable_ifNotVisible_false() {
+        assertThat(mController.isAvailable()).isFalse();
+    }
+}