Duplicate dark mode settings to accessibility display settings

Bug: 123227114
Test: Manual
      make RunSettingsRoboTests ROBOTEST_FILTER=AccessibilitySettings
Change-Id: Icb60bc18e31377a2e73780004bd1bdea7bc96eea

res/xml/accessibility_settings.xml

@@ -58,6 +58,14 @@
             android:title="@string/screen_zoom_title"
             settings:searchable="false"/>
 
+        <ListPreference
+            android:key="dark_ui_mode_accessibility"
+            android:title="@string/dark_ui_mode"
+            android:dialogTitle="@string/dark_ui_mode_title"
+            android:entries="@array/dark_ui_mode_entries"
+            android:entryValues="@array/dark_ui_mode_values"
+            settings:searchable="false" />
+
         <Preference
             android:fragment="com.android.settings.accessibility.MagnificationPreferenceFragment"
             android:key="magnification_preference_screen"

src/com/android/settings/accessibility/AccessibilitySettings.java

@@ -57,6 +57,7 @@ import com.android.internal.view.RotationPolicy.RotationPolicyListener;
 import com.android.settings.R;
 import com.android.settings.SettingsPreferenceFragment;
 import com.android.settings.Utils;
+import com.android.settings.display.DarkUIPreferenceController;
 import com.android.settings.display.ToggleFontSizePreferenceFragment;
 import com.android.settings.search.BaseSearchIndexProvider;
 import com.android.settingslib.RestrictedLockUtils.EnforcedAdmin;
@@ -133,6 +134,8 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
             "accessibility_content_timeout_preference_fragment";
     private static final String ACCESSIBILITY_CONTROL_TIMEOUT_PREFERENCE =
             "accessibility_control_timeout_preference_fragment";
+    private static final String DARK_UI_MODE_PREFERENCE =
+            "dark_ui_mode_accessibility";
 
 
     // Extras passed to sub-fragments.
@@ -236,6 +239,8 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
     private SwitchPreference mToggleInversionPreference;
     private ColorInversionPreferenceController mInversionPreferenceController;
     private AccessibilityHearingAidPreferenceController mHearingAidPreferenceController;
+    private ListPreference mDarkUIModePreference;
+    private DarkUIPreferenceController mDarkUIPreferenceController;
 
     private int mLongPressTimeoutDefault;
 
@@ -501,6 +506,13 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
 
         // Vibrations.
         mVibrationPreferenceScreen = findPreference(VIBRATION_PREFERENCE_SCREEN);
+
+        // Dark Mode.
+        mDarkUIModePreference = findPreference(DARK_UI_MODE_PREFERENCE);
+        mDarkUIPreferenceController = new DarkUIPreferenceController(getContext(),
+                DARK_UI_MODE_PREFERENCE);
+        mDarkUIPreferenceController.displayPreference(getPreferenceScreen());
+        mDarkUIModePreference.setSummary(mDarkUIPreferenceController.getSummary());
     }
 
     private void updateAllPreferences() {
@@ -683,6 +695,9 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
         // If the quick setting is enabled, the preference MUST be enabled.
         mInversionPreferenceController.updateState(mToggleInversionPreference);
 
+        // Dark Mode
+        mDarkUIPreferenceController.updateState(mDarkUIModePreference);
+
         // Power button ends calls.
         if (KeyCharacterMap.deviceHasKey(KeyEvent.KEYCODE_POWER)
                 && Utils.isVoiceCapable(getActivity())) {

tests/robotests/src/com/android/settings/accessibility/AccessibilitySettingsTest.java

@@ -21,14 +21,17 @@ import static com.google.common.truth.Truth.assertThat;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.spy;
 
+import android.app.UiModeManager;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.os.Vibrator;
 import android.provider.Settings;
 
+import androidx.preference.ListPreference;
 import androidx.preference.Preference;
 
 import com.android.settings.R;
+import com.android.settings.display.DarkUIPreferenceController;
 import com.android.settings.testutils.XmlTestUtils;
 
 import org.junit.Before;
@@ -47,10 +50,13 @@ public class AccessibilitySettingsTest {
             "accessibility_content_timeout_preference_fragment";
     private static final String ACCESSIBILITY_CONTROL_TIMEOUT_PREFERENCE =
             "accessibility_control_timeout_preference_fragment";
+    private static final String DARK_UI_MODE_PREFERENCE =
+            "dark_ui_mode_accessibility";
 
     private Context mContext;
     private ContentResolver mContentResolver;
     private AccessibilitySettings mSettings;
+    private UiModeManager mUiModeManager;
 
     @Before
     public void setup() {
@@ -59,6 +65,7 @@ public class AccessibilitySettingsTest {
         mContentResolver = mContext.getContentResolver();
         mSettings = spy(new AccessibilitySettings());
         doReturn(mContext).when(mSettings).getContext();
+        mUiModeManager = mContext.getSystemService(UiModeManager.class);
     }
 
     @Test
@@ -146,4 +153,29 @@ public class AccessibilitySettingsTest {
 
         assertThat(preference.getSummary()).isEqualTo(mContext.getResources().getString(resId));
     }
+
+    @Test
+    public void testDarkUIModePreferenceSummary_shouldUpdateSummary() {
+        final ListPreference darkUIModePreference = new ListPreference(mContext);
+        final DarkUIPreferenceController mController;
+        doReturn(darkUIModePreference).when(mSettings).findPreference(
+            DARK_UI_MODE_PREFERENCE);
+        mController = new DarkUIPreferenceController(mContext, DARK_UI_MODE_PREFERENCE);
+        final String darkUIModeDescription = modeToDescription(mUiModeManager.getNightMode());
+        darkUIModePreference.setSummary(mController.getSummary());
+
+        assertThat(darkUIModePreference.getSummary()).isEqualTo(darkUIModeDescription);
+    }
+
+    private String modeToDescription(int mode) {
+        String[] values = mContext.getResources().getStringArray(R.array.dark_ui_mode_entries);
+        switch (mode) {
+            case UiModeManager.MODE_NIGHT_YES:
+                return values[0];
+            case UiModeManager.MODE_NIGHT_NO:
+            case UiModeManager.MODE_NIGHT_AUTO:
+            default:
+                return values[1];
+        }
+    }
 }