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

/*
 * Copyright 2021 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.net.wifi.WifiManager;
import android.widget.Switch;

import androidx.preference.PreferenceScreen;

import com.android.settings.R;
import com.android.settings.core.TogglePreferenceController;
import com.android.settingslib.widget.MainSwitchPreference;
import com.android.settingslib.widget.OnMainSwitchChangeListener;

/**
 * Preference controller for Wi-Fi scanning main switch.
 */
public class WifiScanningMainSwitchPreferenceController extends TogglePreferenceController
        implements OnMainSwitchChangeListener {

    private static final String KEY_WIFI_SCANNING_SWITCH = "wifi_always_scanning_switch";
    private final WifiManager mWifiManager;

    public WifiScanningMainSwitchPreferenceController(Context context) {
        super(context, KEY_WIFI_SCANNING_SWITCH);
        mWifiManager = context.getSystemService(WifiManager.class);
    }

    @Override
    public void displayPreference(PreferenceScreen screen) {
        super.displayPreference(screen);

        MainSwitchPreference pref = screen.findPreference(getPreferenceKey());
        pref.addOnSwitchChangeListener(this);
        pref.updateStatus(isChecked());
    }

    @Override
    public int getAvailabilityStatus() {
        return mContext.getResources().getBoolean(R.bool.config_show_location_scanning)
                ? AVAILABLE
                : UNSUPPORTED_ON_DEVICE;
    }

    @Override
    public boolean isChecked() {
        return mWifiManager.isScanAlwaysAvailable();
    }

    @Override
    public boolean setChecked(boolean isChecked) {
        mWifiManager.setScanAlwaysAvailable(isChecked);
        // Returning true means the underlying setting is updated.
        return true;
    }

    @Override
    public void onSwitchChanged(Switch switchView, boolean isChecked) {
        if (isChecked != isChecked()) {
            setChecked(isChecked);
        }
    }
}