feat(force invert): add force invert Settings preference in A11y > Color and Motion

Bug: 312289375
Test: atest packages/apps/Settings/tests/robotests/src/com/android/settings/accessibility/ColorAndMotionFragmentTest.java
  && atest packages/apps/Settings/tests/robotests/src/com/android/settings/accessibility/ToggleForceInvertPreferenceControllerTest.java
Flag: android.view.accessibility.Flags.forceInvertColor

Change-Id: I2739a1dfecbbddcd240a3113344987ade2b7c717

res/values/strings.xml

@@ -4805,6 +4805,10 @@
     <string name="accessibility_toggle_large_pointer_icon_title">Large mouse pointer</string>
     <!-- Summary for the accessibility preference for enabling/disabling large icons for mouse/trackpad pointers. [CHAR LIMIT=60] -->
     <string name="accessibility_toggle_large_pointer_icon_summary">Make the mouse pointer more noticeable</string>
+    <!-- Title for the accessibility preference for forcing all apps to use dark theme. [CHAR LIMIT=35] -->
+    <string name="accessibility_force_invert_title">Make all apps dark</string>
+    <!-- Summary for the accessibility preference for forcing all apps to use dark theme. [CHAR LIMIT=100] -->
+    <string name="accessibility_force_invert_summary">Applies to apps without their own dark theme. Some apps may have display issues, like inverted colors.</string>
     <!-- Title for the accessibility preference for disabling animations. [CHAR LIMIT=35] -->
     <string name="accessibility_disable_animations">Remove animations</string>
     <!-- Summary for the accessibility preference for disabling animations. [CHAR LIMIT=60] -->

res/xml/accessibility_color_and_motion.xml

@@ -49,6 +49,14 @@
         settings:controller="com.android.settings.display.DarkUIPreferenceController"
         settings:searchable="false"/>
 
+    <SwitchPreferenceCompat
+        android:icon="@drawable/ic_dark_ui"
+        android:key="toggle_force_invert"
+        android:persistent="false"
+        android:summary="@string/accessibility_force_invert_summary"
+        android:title="@string/accessibility_force_invert_title"
+        settings:controller="com.android.settings.accessibility.ToggleForceInvertPreferenceController"/>
+
     <SwitchPreferenceCompat
         android:icon="@drawable/ic_accessibility_animation"
         android:key="toggle_disable_animations"

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

@@ -21,11 +21,13 @@ import android.hardware.display.ColorDisplayManager;
 import android.os.Bundle;
 import android.os.Handler;
 import android.provider.Settings;
+import android.view.accessibility.Flags;
 
 import androidx.preference.Preference;
 import androidx.preference.PreferenceCategory;
 import androidx.preference.TwoStatePreference;
 
+import com.android.internal.annotations.VisibleForTesting;
 import com.android.settings.R;
 import com.android.settings.dashboard.DashboardFragment;
 import com.android.settings.search.BaseSearchIndexProvider;
@@ -47,6 +49,8 @@ public class ColorAndMotionFragment extends DashboardFragment {
     private static final String DISPLAY_DALTONIZER_PREFERENCE_SCREEN = "daltonizer_preference";
     private static final String TOGGLE_DISABLE_ANIMATIONS = "toggle_disable_animations";
     private static final String TOGGLE_LARGE_POINTER_ICON = "toggle_large_pointer_icon";
+    @VisibleForTesting
+    static final String TOGGLE_FORCE_INVERT = "toggle_force_invert";
 
     private Preference mDisplayDaltonizerPreferenceScreen;
     private TwoStatePreference mToggleDisableAnimationsPreference;
@@ -70,6 +74,9 @@ public class ColorAndMotionFragment extends DashboardFragment {
         mShortcutFeatureKeys.add(Settings.Secure.ACCESSIBILITY_DISPLAY_DALTONIZER_ENABLED);
         mShortcutFeatureKeys.add(Settings.Secure.ACCESSIBILITY_SHORTCUT_TARGET_SERVICE);
         mShortcutFeatureKeys.add(Settings.Secure.ACCESSIBILITY_BUTTON_TARGETS);
+        if (Flags.forceInvertColor()) {
+            mShortcutFeatureKeys.add(ToggleForceInvertPreferenceController.SETTINGS_KEY);
+        }
 
         mSettingsContentObserver = new AccessibilitySettingsContentObserver(new Handler());
         mSettingsContentObserver.registerKeysToObserverCallback(mShortcutFeatureKeys,

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

@@ -0,0 +1,63 @@
+/*
+ * 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.accessibility;
+
+import android.content.Context;
+import android.provider.Settings;
+import android.view.accessibility.Flags;
+
+import androidx.annotation.VisibleForTesting;
+
+import com.android.settings.R;
+import com.android.settings.core.TogglePreferenceController;
+
+/** A toggle preference controller for force invert (force dark). */
+public class ToggleForceInvertPreferenceController extends TogglePreferenceController {
+
+    public static final String SETTINGS_KEY =
+            Settings.Secure.ACCESSIBILITY_FORCE_INVERT_COLOR_ENABLED;
+
+    @VisibleForTesting
+    static final int ON = 1;
+    @VisibleForTesting
+    static final int OFF = 0;
+
+    public ToggleForceInvertPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public boolean isChecked() {
+        return Settings.Secure.getInt(mContext.getContentResolver(), SETTINGS_KEY, OFF) != OFF;
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        return Settings.Secure.putInt(mContext.getContentResolver(),
+                SETTINGS_KEY, isChecked ? ON : OFF);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return Flags.forceInvertColor() ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
+    }
+
+    @Override
+    public int getSliceHighlightMenuRes() {
+        return R.string.menu_key_accessibility;
+    }
+}

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

@@ -16,10 +16,16 @@
 
 package com.android.settings.accessibility;
 
+import static android.view.accessibility.Flags.FLAG_FORCE_INVERT_COLOR;
+
 import static com.google.common.truth.Truth.assertThat;
 
 import android.app.settings.SettingsEnums;
 import android.content.Context;
+import android.platform.test.annotations.RequiresFlagsDisabled;
+import android.platform.test.annotations.RequiresFlagsEnabled;
+import android.platform.test.flag.junit.CheckFlagsRule;
+import android.platform.test.flag.junit.DeviceFlagsValueProvider;
 
 import androidx.test.core.app.ApplicationProvider;
 
@@ -27,6 +33,7 @@ import com.android.settings.R;
 import com.android.settings.testutils.XmlTestUtils;
 
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.robolectric.RobolectricTestRunner;
@@ -37,6 +44,9 @@ import java.util.List;
 @RunWith(RobolectricTestRunner.class)
 public class ColorAndMotionFragmentTest {
 
+    @Rule
+    public final CheckFlagsRule mCheckFlagsRule = DeviceFlagsValueProvider.createCheckFlagsRule();
+
     private final Context mContext = ApplicationProvider.getApplicationContext();
     private ColorAndMotionFragment mFragment;
 
@@ -63,6 +73,20 @@ public class ColorAndMotionFragmentTest {
     }
 
     @Test
+    @RequiresFlagsEnabled(FLAG_FORCE_INVERT_COLOR)
+    public void forceInvertEnabled_getNonIndexableKeys_existInXmlLayout() {
+        final List<String> niks = ColorAndMotionFragment.SEARCH_INDEX_DATA_PROVIDER
+                .getNonIndexableKeys(mContext);
+        final List<String> keys =
+                XmlTestUtils.getKeysFromPreferenceXml(mContext,
+                        R.xml.accessibility_color_and_motion);
+
+        assertThat(niks).doesNotContain(ColorAndMotionFragment.TOGGLE_FORCE_INVERT);
+        assertThat(keys).containsAtLeastElementsIn(niks);
+    }
+
+    @Test
+    @RequiresFlagsDisabled(FLAG_FORCE_INVERT_COLOR)
     public void getNonIndexableKeys_existInXmlLayout() {
         final List<String> niks = ColorAndMotionFragment.SEARCH_INDEX_DATA_PROVIDER
                 .getNonIndexableKeys(mContext);
@@ -70,6 +94,7 @@ public class ColorAndMotionFragmentTest {
                 XmlTestUtils.getKeysFromPreferenceXml(mContext,
                         R.xml.accessibility_color_and_motion);
 
+        assertThat(niks).contains(ColorAndMotionFragment.TOGGLE_FORCE_INVERT);
         assertThat(keys).containsAtLeastElementsIn(niks);
     }
 }

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

@@ -0,0 +1,107 @@
+/*
+ * 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.accessibility;
+
+import static android.view.accessibility.Flags.FLAG_FORCE_INVERT_COLOR;
+
+import static com.android.settings.accessibility.AccessibilityUtil.State.OFF;
+import static com.android.settings.accessibility.AccessibilityUtil.State.ON;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+import android.platform.test.annotations.RequiresFlagsDisabled;
+import android.platform.test.annotations.RequiresFlagsEnabled;
+import android.platform.test.flag.junit.CheckFlagsRule;
+import android.platform.test.flag.junit.DeviceFlagsValueProvider;
+import android.provider.Settings;
+
+import androidx.test.core.app.ApplicationProvider;
+
+import com.android.settings.core.BasePreferenceController;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+
+/** Tests for {@link ToggleForceInvertPreferenceController}. */
+@RunWith(RobolectricTestRunner.class)
+public class ToggleForceInvertPreferenceControllerTest {
+
+    @Rule
+    public final CheckFlagsRule mCheckFlagsRule = DeviceFlagsValueProvider.createCheckFlagsRule();
+
+    private final Context mContext = ApplicationProvider.getApplicationContext();
+    private ToggleForceInvertPreferenceController mController;
+
+    @Before
+    public void setUp() {
+        mController = new ToggleForceInvertPreferenceController(
+                mContext,
+                ColorAndMotionFragment.TOGGLE_FORCE_INVERT
+        );
+    }
+
+    @Test
+    @RequiresFlagsDisabled(FLAG_FORCE_INVERT_COLOR)
+    public void flagOff_getAvailabilityStatus_shouldReturnUnsupported() {
+        assertThat(mController.getAvailabilityStatus())
+                .isEqualTo(BasePreferenceController.UNSUPPORTED_ON_DEVICE);
+    }
+
+    @Test
+    @RequiresFlagsEnabled(FLAG_FORCE_INVERT_COLOR)
+    public void flagOn_getAvailabilityStatus_shouldReturnAvailable() {
+        assertThat(mController.getAvailabilityStatus())
+                .isEqualTo(BasePreferenceController.AVAILABLE);
+    }
+
+    @Test
+    public void settingOff_reflectsCorrectValue() {
+        setEnabled(false);
+        assertThat(mController.isChecked()).isFalse();
+    }
+
+    @Test
+    public void settingOn_reflectsCorrectValue() {
+        setEnabled(true);
+        assertThat(mController.isChecked()).isTrue();
+    }
+
+    @Test
+    public void onCheck_settingChanges() {
+        setEnabled(false);
+
+        mController.setChecked(true);
+        assertThat(isEnabled()).isTrue();
+
+        mController.setChecked(false);
+        assertThat(isEnabled()).isFalse();
+    }
+
+    private boolean isEnabled() {
+        return Settings.Secure.getInt(mContext.getContentResolver(),
+                Settings.Secure.ACCESSIBILITY_FORCE_INVERT_COLOR_ENABLED, /* def=*/ -1) == ON;
+    }
+
+    private void setEnabled(boolean enabled) {
+        Settings.Secure.putInt(mContext.getContentResolver(),
+                Settings.Secure.ACCESSIBILITY_FORCE_INVERT_COLOR_ENABLED, enabled ? ON : OFF);
+    }
+}