Android功能模块化之网络连接状态判断

有些时候在程序中需要判断网络连接状态、GPS连接状态等，主要是通过调用context.getSystemService(String name)来获取系统相应的服务，再通过相应的服务去判断其状态信息。

传入Name	返回对象	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	PowerManager	电源服务
ALARM_SERVICE	AlarmManager	闹钟服务
NOTIFICATION_SERVICE	NotificationManager	状态栏服务
KEYGUARD_SERVICE	KeyguardManager	键盘锁服务
LOCATION_SERVICE	LocationManager	位置服务，如GPS
SEARCH_SERVICE	SearchManager	搜索服务
VERATOR_SERVICE	Vebrator	手机震动的服务
CONNECTIVITY_SERVICE	Connectivity	网络连接服务
WIFI_SERVICE	WifiManager	WiFi服务
TELEPHONY_SERVICE	TelephonyManager	电话服务

（1）判断网络是否可用

public static boolean isNetworkAvailable(Context context) {
boolean flag = false;
ConnectivityManager cManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (cManager != null) {
NetworkInfo[] infos = cManager.getAllNetworkInfo();
if (infos != null) {
for (int i = 0; i < infos.length; i++) {
if (infos[i].getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
}
}
return flag;
}

（2）判断GPS是否打开

public static boolean isGpsEnabled(Context context) {
LocationManager locationManager = (LocationManager) context
.getSystemService(Context.LOCATION_SERVICE);
List<String> accessibleProviders = locationManager.getAllProviders();
return accessibleProviders != null && accessibleProviders.size() > 0;
}

（3）判断Wifi是否连接

public static boolean isWifiEnabled(Context context) {
ConnectivityManager cManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
TelephonyManager tManager = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
return ((cManager.getActiveNetworkInfo() != null && cManager
.getActiveNetworkInfo().getState() == NetworkInfo.State.CONNECTED) || tManager
.getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS);
}

（4）判断3G网络是否连接

public static boolean is3GEnabled(Context context) {
ConnectivityManager cManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = cManager.getActiveNetworkInfo();
return (networkInfo != null && networkInfo.getType() == ConnectivityManager.TYPE_MOBILE);
}

（5）判断当前网络是wifi还是3G

public static boolean isWifiOr3G(Context context) {
ConnectivityManager cManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = cManager.getActiveNetworkInfo();
if (networkInfo != null
&& networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
return true;
}
return false;
}

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