Android操作系统服务（Context.getSystemService() ）

getSystemService是Android很重要的一个API，它是Activity的一个方法，根据传入的NAME来取得对应的Object，然后转换成相应的服务对象。下面介绍系统相应的服务：

传入的Name	返回的对象	说明
WINDOW_SERVICE	WindowManager	管理打开的窗口程序
LAYOUT_INFLATER_SERVICE	LayoutInflater	取得xml里定义的view
ACTIVITY_SERVICE	ActivityManager	管理应用程序的系统状态
POWER_SERVICE	PowerManger	电源的服务
ALARM_SERVICE	AlarmManager	闹钟的服务
NOTIFICATION_SERVICE	NotificationManager	状态栏的服务
KEYGUARD_SERVICE	KeyguardManager	键盘锁的服务
LOCATION_SERVICE	LocationManager	位置的服务，如GPS
SEARCH_SERVICE	SearchManager	搜索的服务
VEBRATOR_SERVICE	Vebrator	手机震动的服务
CONNECTIVITY_SERVICE	Connectivity	网络连接的服务
WIFI_SERVICE	WifiManager	Wi-Fi服务
TELEPHONY_SERVICE	TeleponyManager	电话服务

代码示例，使用判断网络连接是否可用，并判断是否是wifi：

    protected int checkNetworkInfo() {        ConnectivityManager con = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo networkinfo = con.getActiveNetworkInfo();        if (networkinfo == null || !networkinfo.isAvailable()) {            // 当前网络不可用            return 1;        }        boolean wifi = con.getNetworkInfo(ConnectivityManager.TYPE_WIFI)                .isConnectedOrConnecting();        if (wifi) {            // 使用wifi上网            return 2;        }        return 3;    }

转载：获取Android正在运行的任务和服务

检测某ActivityUpdate是否在当前Task的栈顶

public static boolean isTopActivy(String cmdName, Context context)    {        ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);        List<RunningTaskInfo> runningTaskInfos = manager.getRunningTasks(Integer.MAX_VALUE);        String cmpNameTemp = null;        if (null != runningTaskInfos)        {            cmpNameTemp = (runningTaskInfos.get(0).topActivity).toString();        }        if (null == cmpNameTemp)        {            return false;        }                return cmpNameTemp.equals(cmdName);    }

判断Android应用是否在前台

public static boolean isAppOnForeground(Context context)    {        ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);        String packageName = context.getPackageName();        List<RecentTaskInfo> appTask = activityManager.getRecentTasks(Integer.MAX_VALUE, 1);                if (appTask == null)        {            return false;        }                if (appTask.get(0).baseIntent.toString().contains(packageName))        {            return true;        }        return false;    }

获取Android手机内安装的所有桌面

private static List<String> getAllTheLauncher(Context context)    {        List<String> names = null;        PackageManager pkgMgt = context.getPackageManager();        Intent it = new Intent(Intent.ACTION_MAIN);        it.addCategory(Intent.CATEGORY_HOME);        List<ResolveInfo> ra = pkgMgt.queryIntentActivities(it, 0);        if (ra.size() != 0)        {            names = new ArrayList<String>();        }        for (int i = 0; i < ra.size(); i++)        {            String packageName = ra.get(i).activityInfo.packageName;            names.add(packageName);        }        return names;    }

Android 判断程序前后台状态

public static boolean isLauncherRunnig(Context context)    {        boolean result = false;        List<String> names = getAllTheLauncher(context);        ActivityManager mActivityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);        List<ActivityManager.RunningAppProcessInfo> appList = mActivityManager.getRunningAppProcesses();        for (RunningAppProcessInfo running : appList)        {            if (running.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND)            {                for (int i = 0; i < names.size(); i++)                {                    if (names.get(i).equals(running.processName))                    {                        result = true;                        break;                    }                }            }        }        return result;    }

转载：获取Android正在运行的任务和服务

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