java source code of DarkThemeApplication

/*
 * 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.example.android.darktheme;

import android.app.Application;
import android.content.SharedPreferences;

import androidx.preference.PreferenceManager;

public class DarkThemeApplication extends Application {

    public void onCreate() {
        super.onCreate();
        SharedPreferences sharedPreferences =
                PreferenceManager.getDefaultSharedPreferences(this);
        String themePref = sharedPreferences.getString("themePref", ThemeHelper.DEFAULT_MODE);
        ThemeHelper.applyTheme(themePref);
    }
}