NotificationUtils.java

package com.juanpabloprado.util;

import android.app.ActivityManager;
import android.content.ComponentName;
import android.content.Context;
import android.os.Build;
import java.util.List;

public class NotificationUtils {

  public static boolean isAppInBackground(Context context) {
    boolean isInBackground = true;
    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT_WATCH) {
      List<ActivityManager.RunningAppProcessInfo> runningProcesses = am.getRunningAppProcesses();
      for (ActivityManager.RunningAppProcessInfo processInfo : runningProcesses) {
        if (processInfo.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
          for (String activeProcess : processInfo.pkgList) {
            if (activeProcess.equals(context.getPackageName())) {
              isInBackground = false;
            }
          }
        }
      }
    } else {
      List<ActivityManager.RunningTaskInfo> taskInfo = am.getRunningTasks(1);
      ComponentName componentInfo = taskInfo.get(0).topActivity;
      if (componentInfo.getPackageName().equals(context.getPackageName())) {
        isInBackground = false;
      }
    }

    return isInBackground;
  }
}