Helper class to conveniently get a handle to a system-level service by class, similar to android.content.Context#getSystemService(Class)} that was introduced in API level 23

ContextCompat.java

package com.deveddy.contextcompat;

import android.annotation.SuppressLint;
import android.app.ActivityManager;
import android.app.AlarmManager;
import android.app.DownloadManager;
import android.app.KeyguardManager;
import android.app.NotificationManager;
import android.app.SearchManager;
import android.app.UiModeManager;
import android.app.job.JobScheduler;
import android.content.Context;
import android.location.LocationManager;
import android.media.AudioManager;
import android.media.MediaRouter;
import android.net.ConnectivityManager;
import android.net.wifi.WifiManager;
import android.os.BatteryManager;
import android.os.Build;
import android.os.PowerManager;
import android.os.Vibrator;
import android.support.annotation.Nullable;
import android.telephony.SubscriptionManager;
import android.telephony.TelephonyManager;
import android.view.LayoutInflater;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;


/**
 * Helper class to conveniently get a handle to a system-level service by class, similar to
 * {@link android.content.Context#getSystemService(Class)} that was introduced in API level 23
 */
public class ContextCompat {

    private final Context mContext;

    private ContextCompat(Context context) {
        mContext = context;
    }

    /**
     * Create a new instance of this helper class
     *
     * @param context The context to use for getting system-level services
     */
    public static ContextCompat with(Context context) {
        return new ContextCompat(context);
    }

    /**
     * Return the handle to a system-level service by class.
     * <p>
     * Currently available classes are:
     * {@link android.view.WindowManager}, {@link android.view.LayoutInflater},
     * {@link android.app.ActivityManager}, {@link android.os.PowerManager},
     * {@link android.app.AlarmManager}, {@link android.app.NotificationManager},
     * {@link android.app.KeyguardManager}, {@link android.location.LocationManager},
     * {@link android.app.SearchManager}, {@link android.os.Vibrator},
     * {@link android.net.ConnectivityManager},
     * {@link android.net.wifi.WifiManager},
     * {@link android.media.AudioManager}, {@link android.media.MediaRouter},
     * {@link android.telephony.TelephonyManager}, {@link android.telephony.SubscriptionManager},
     * {@link android.view.inputmethod.InputMethodManager},
     * {@link android.app.UiModeManager}, {@link android.app.DownloadManager},
     * {@link android.os.BatteryManager}, {@link android.app.job.JobScheduler},
     * {@link android.app.usage.NetworkStatsManager}.
     * </p><p>
     * Note: System services obtained via this API may be closely associated with
     * the Context in which they are obtained from.  In general, do not share the
     * service objects between various different contexts (Activities, Applications,
     * Services, Providers, etc.)
     * </p>
     *
     * @param serviceClass The class of the desired service.
     * @return The service or null if the class is not a supported system service.
     */
    @SuppressWarnings("unchecked")
    public final <T> T getSystemService(Class<T> serviceClass) {
        if (Build.VERSION.SDK_INT >= 23) {
            return mContext.getSystemService(serviceClass);
        }
        String serviceName = getSystemServiceName(serviceClass);
        //noinspection ResourceType
        return serviceName != null ? (T) mContext.getSystemService(serviceName) : null;
    }

    @SuppressLint("InlinedApi")
    @Nullable
    private String getSystemServiceName(Class<?> serviceClass) {
        if (serviceClass == WindowManager.class) {
            return Context.WINDOW_SERVICE;
        }

        if (serviceClass == LayoutInflater.class) {
            return Context.LAYOUT_INFLATER_SERVICE;
        }

        if (serviceClass == ActivityManager.class) {
            return Context.ACTIVITY_SERVICE;
        }

        if (serviceClass == PowerManager.class) {
            return Context.POWER_SERVICE;
        }

        if (serviceClass == AlarmManager.class) {
            return Context.ALARM_SERVICE;
        }

        if (serviceClass == NotificationManager.class) {
            return Context.NOTIFICATION_SERVICE;
        }

        if (serviceClass == KeyguardManager.class) {
            return Context.KEYGUARD_SERVICE;
        }

        if (serviceClass == LocationManager.class) {
            return Context.LOCATION_SERVICE;
        }

        if (serviceClass == SearchManager.class) {
            return Context.SEARCH_SERVICE;
        }

        if (serviceClass == Vibrator.class) {
            return Context.VIBRATOR_SERVICE;
        }

        if (serviceClass == ConnectivityManager.class) {
            return Context.CONNECTIVITY_SERVICE;
        }

        if (serviceClass == WifiManager.class) {
            return Context.WIFI_SERVICE;
        }

        if (serviceClass == AudioManager.class) {
            return Context.AUDIO_SERVICE;
        }

        if (serviceClass == MediaRouter.class) {
            return Context.MEDIA_ROUTER_SERVICE;
        }

        if (serviceClass == TelephonyManager.class) {
            return Context.TELEPHONY_SERVICE;
        }

        if (serviceClass == SubscriptionManager.class) {
            return Context.TELEPHONY_SUBSCRIPTION_SERVICE;
        }

        if (serviceClass == InputMethodManager.class) {
            return Context.INPUT_METHOD_SERVICE;
        }

        if (serviceClass == UiModeManager.class) {
            return Context.UI_MODE_SERVICE;
        }

        if (serviceClass == DownloadManager.class) {
            return Context.DOWNLOAD_SERVICE;
        }

        if (serviceClass == BatteryManager.class) {
            return Context.BATTERY_SERVICE;
        }

        if (serviceClass == JobScheduler.class) {
            return Context.JOB_SCHEDULER_SERVICE;
        }

        return null;
    }
}