Handle Aware sensor status for Always On

- "Always On" preference will be hiden when aware
sensor is available
- Extract NavModeCandidateInfo from SystemNavigationGestureSettings

Bug: 136610131
Test: robotest & manual
Change-Id: If58c70549339b66116f19df7193d85bb04e3f1b7

src/com/android/settings/utils/CandidateInfoExtra.java

@@ -0,0 +1,54 @@
+/*
+ * 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.utils;
+
+import android.graphics.drawable.Drawable;
+
+import com.android.settingslib.widget.CandidateInfo;
+
+public class CandidateInfoExtra extends CandidateInfo {
+    private final CharSequence mLabel;
+    private final CharSequence mSummary;
+    private final String mKey;
+
+    public CandidateInfoExtra(CharSequence label, CharSequence summary, String key,
+            boolean enabled) {
+        super(enabled);
+        mLabel = label;
+        mSummary = summary;
+        mKey = key;
+    }
+
+    @Override
+    public CharSequence loadLabel() {
+        return mLabel;
+    }
+
+    public CharSequence loadSummary() {
+        return mSummary;
+    }
+
+    @Override
+    public Drawable loadIcon() {
+        return null;
+    }
+
+    @Override
+    public String getKey() {
+        return mKey;
+    }
+}