Convert location settings to DashboardFragment.

- change LocationMode, LocationSettings, and ScanningSettings to be
DashboardFragment.
- remove LocationSettingsBase and moved base logics into base
controller.
- add controllers for the preferences under the 3 location settings
pages.

Fixes: 68719207
Test: make RunSettingsRoboTests
Change-Id: Icedf691c2a9f7989faebee39ea9da672209b7957

src/com/android/settings/location/WifiScanningPreferenceController.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2017 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.location;
+
+import android.content.Context;
+import android.provider.Settings;
+import android.support.v14.preference.SwitchPreference;
+import android.support.v7.preference.Preference;
+
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.core.AbstractPreferenceController;
+
+public class WifiScanningPreferenceController extends AbstractPreferenceController
+        implements PreferenceControllerMixin {
+
+    private static final String KEY_WIFI_SCAN_ALWAYS_AVAILABLE = "wifi_always_scanning";
+
+    public WifiScanningPreferenceController(Context context) {
+        super(context);
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return true;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_WIFI_SCAN_ALWAYS_AVAILABLE;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        ((SwitchPreference) preference).setChecked(
+                Settings.Global.getInt(mContext.getContentResolver(),
+                        Settings.Global.WIFI_SCAN_ALWAYS_AVAILABLE, 0) == 1);
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        if (KEY_WIFI_SCAN_ALWAYS_AVAILABLE.equals(preference.getKey())) {
+            Settings.Global.putInt(mContext.getContentResolver(),
+                    Settings.Global.WIFI_SCAN_ALWAYS_AVAILABLE,
+                    ((SwitchPreference) preference).isChecked() ? 1 : 0);
+            return true;
+        }
+        return false;
+    }
+}