Add disabled checkbox preference

A checkbox preference that users can't change, but with non-disabled
test for legibilty.

Test: make -j RunSettingsRoboTests
Bug: 77657376
Change-Id: Iea9bbcc5efbf80cbc380fb8d5a360fe8386889a0

src/com/android/settings/widget/DisabledCheckBoxPreference.java

@@ -0,0 +1,62 @@
+/*
+ * 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.widget;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.View;
+
+import android.support.v7.preference.CheckBoxPreference;
+import android.support.v7.preference.PreferenceViewHolder;
+
+/**
+ * A CheckboxPreference with a disabled checkbox. Differs from CheckboxPreference.setDisabled()
+ * in that the text is not dimmed.
+ */
+public class DisabledCheckBoxPreference extends CheckBoxPreference {
+
+    public DisabledCheckBoxPreference(Context context, AttributeSet attrs,
+            int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+    }
+
+    public DisabledCheckBoxPreference(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    public DisabledCheckBoxPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public DisabledCheckBoxPreference(Context context) {
+        super(context);
+    }
+
+    @Override
+    public void onBindViewHolder(PreferenceViewHolder holder) {
+        super.onBindViewHolder(holder);
+
+        View view = holder.findViewById(android.R.id.checkbox);
+        view.setEnabled(false);
+        holder.itemView.setEnabled(false);
+    }
+
+    @Override
+    protected void performClick(View view) {
+        // Do nothing
+    }
+}