network: Android 网络推断（wifi、3G与其它）

public class NetworkProber { 



/** 

* 网络是否可用 

* 

* @param activity 

* @return 

*/ 

public static boolean isNetworkAvailable(Context context) { 

ConnectivityManager connectivity = (ConnectivityManager) context 

.getSystemService(Context.CONNECTIVITY_SERVICE); 

if (connectivity == null) { 

} else { 

NetworkInfo[] info = connectivity.getAllNetworkInfo(); 

if (info != null) { 

for (int i = 0; i < info.length; i++) { 

if (info[i].getState() == NetworkInfo.State.CONNECTED) { 

return true; 

} 

} 

} 

} 

return false; 

} 



/** 

* Gps是否打开 

* 

* @param context 

* @return 

*/ 

public static boolean isGpsEnabled(Context context) { 

LocationManager locationManager = ((LocationManager) context 

.getSystemService(Context.LOCATION_SERVICE)); 

List<String> accessibleProviders = locationManager.getProviders(true); 

return accessibleProviders != null && accessibleProviders.size() > 0; 

} 



/** 

* wifi是否打开 

*/ 

public static boolean isWifiEnabled(Context context) { 

ConnectivityManager mgrConn = (ConnectivityManager) context 

.getSystemService(Context.CONNECTIVITY_SERVICE); 

TelephonyManager mgrTel = (TelephonyManager) context 

.getSystemService(Context.TELEPHONY_SERVICE); 

return ((mgrConn.getActiveNetworkInfo() != null && mgrConn 

.getActiveNetworkInfo().getState() == NetworkInfo.State.CONNECTED) || mgrTel 

.getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS); 

} 



/** 

* 推断当前网络是否是wifi网络 

* if(activeNetInfo.getType()==ConnectivityManager.TYPE_MOBILE) { //推断3G网 

* 

* @param context 

* @return boolean 

*/ 

public static boolean isWifi(Context context) { 

ConnectivityManager connectivityManager = (ConnectivityManager) context 

.getSystemService(Context.CONNECTIVITY_SERVICE); 

NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo(); 

if (activeNetInfo != null 

&& activeNetInfo.getType() == ConnectivityManager.TYPE_WIFI) { 

return true; 

} 

return false; 

} 



/** 

* 推断当前网络是否是3G网络 

* 

* @param context 

* @return boolean 

*/ 

public static boolean is3G(Context context) { 

ConnectivityManager connectivityManager = (ConnectivityManager) context 

.getSystemService(Context.CONNECTIVITY_SERVICE); 

NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo(); 

if (activeNetInfo != null 

&& activeNetInfo.getType() == ConnectivityManager.TYPE_MOBILE) { 

return true; 

} 

return false; 

} 

} 

另外还有两个方法推断网络是否可用：

public static boolean isNetworkAvailable_00(Context context) { 

ConnectivityManager cm = ((ConnectivityManager) context 

.getSystemService(Context.CONNECTIVITY_SERVICE)); 

if (cm != null) { 

NetworkInfo info = cm.getActiveNetworkInfo(); 

if (info != null && info.isConnectedOrConnecting()) { 

return true; 

} 

} 

return false; 

} 



public static boolean isNetworkAvailable_01(Context context) { 

ConnectivityManager cm = (ConnectivityManager) context 

.getSystemService(Context.CONNECTIVITY_SERVICE); 

NetworkInfo network = cm.getActiveNetworkInfo(); 

if (network != null) { 

return network.isAvailable(); 

} 

return false; 

} 

更加严谨的写法： 

public static boolean checkNet(Context context) { 



try { 

ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); 

if (connectivity != null) { 



NetworkInfo info = connectivity.getActiveNetworkInfo(); 

if (info != null && info.isConnected()) { 



if (info.getState() == NetworkInfo.State.CONNECTED) { 

return true; 

} 

} 

} 

} catch (Exception e) { 

return false; 

} 

return false; 

}