Separate text contrast preference controller from accessibility

Bug: 135056871
Test: manual, robotests
Change-Id: Ia28d8038f341a1a74385d168f78da8a10cca8fcd

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

@@ -0,0 +1,46 @@
+/*
+ * 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 com.android.settings.core.TogglePreferenceController;
+
+public class HighTextContrastPreferenceController extends TogglePreferenceController {
+
+    public HighTextContrastPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public boolean isChecked() {
+        return Settings.Secure.getInt(mContext.getContentResolver(),
+                Settings.Secure.ACCESSIBILITY_HIGH_TEXT_CONTRAST_ENABLED, 0) == 1;
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        return Settings.Secure.putInt(mContext.getContentResolver(),
+                Settings.Secure.ACCESSIBILITY_HIGH_TEXT_CONTRAST_ENABLED, (isChecked ? 1 : 0));
+    }
+}