Add swipe to see notification to "Notification preferences"

Bug: 31799948
Test: RunSettingsRoboTests
Change-Id: Ib892ca4d5596c1c89e1efaf636a3eefd7cee371a

src/com/android/settings/gestures/SwipeToNotificationPreferenceController.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2016 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.gestures;
+
+import android.content.Context;
+import android.provider.Settings;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.TwoStatePreference;
+
+import com.android.settings.core.PreferenceController;
+
+public class SwipeToNotificationPreferenceController extends PreferenceController
+        implements Preference.OnPreferenceChangeListener {
+
+    private static final String PREF_KEY_SWIPE_DOWN_FINGERPRINT = "gesture_swipe_down_fingerprint";
+
+    public SwipeToNotificationPreferenceController(Context context) {
+        super(context);
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        return false;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return PREF_KEY_SWIPE_DOWN_FINGERPRINT;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        super.updateState(preference);
+        if (preference != null && preference instanceof TwoStatePreference) {
+            ((TwoStatePreference) preference).setChecked(isSystemUINavigationEnabled());
+        }
+    }
+
+    @Override
+    protected boolean isAvailable() {
+        return mContext.getResources().getBoolean(
+                com.android.internal.R.bool.config_supportSystemNavigationKeys);
+    }
+
+    private boolean isSystemUINavigationEnabled() {
+        return Settings.Secure.getInt(mContext.getContentResolver(),
+                Settings.Secure.SYSTEM_NAVIGATION_KEYS_ENABLED, 0)
+                == 1;
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        Settings.Secure.putInt(mContext.getContentResolver(),
+                Settings.Secure.SYSTEM_NAVIGATION_KEYS_ENABLED, (boolean) newValue ? 1 : 0);
+        return true;
+    }
+}