src/com/android/settings/display/BatteryPercentagePreferenceController.java

/*
 * 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.display;

import android.content.Context;
import android.provider.Settings;
import android.support.v7.preference.Preference;
import android.support.v14.preference.SwitchPreference;

import com.android.settings.core.PreferenceController;

import static android.provider.Settings.System.SHOW_BATTERY_PERCENT;

/**
 * A controller to manage the switch for showing battery percentage in the status bar.
 */

public class BatteryPercentagePreferenceController extends PreferenceController
        implements Preference.OnPreferenceChangeListener {

    private static final String KEY_BATTERY_PERCENTAGE = "battery_percentage";

    public BatteryPercentagePreferenceController(Context context) {
        super(context);
    }

    @Override
    public boolean isAvailable() {
        return true;
    }

    @Override
    public String getPreferenceKey() {
        return KEY_BATTERY_PERCENTAGE;
    }

    @Override
    public void updateState(Preference preference) {
        int setting = Settings.System.getInt(mContext.getContentResolver(),
                SHOW_BATTERY_PERCENT, 0);

        ((SwitchPreference) preference).setChecked(setting == 1);
    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        boolean showPercentage = (Boolean) newValue;
        Settings.System.putInt(mContext.getContentResolver(), SHOW_BATTERY_PERCENT,
                showPercentage ? 1 : 0);
        return true;
    }
}