获取网络状态

首先在AndroidManifest.xml添加权限

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

1,判断是否有网络连接

 1     public boolean isNetworkConnected(Context context) {
 2         if (context != null) {
 3             ConnectivityManager mConnectivityManager = (ConnectivityManager) context
 4                     .getSystemService(Context.CONNECTIVITY_SERVICE);
 5             NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
 6             if (mNetworkInfo != null) {
 7                 return mNetworkInfo.isAvailable();
 8             }
 9         }
10 
11         return false;
12     }

2.判断WIFI网络是否可用

 1     public boolean isWifiConnected(Context context) {
 2         if (context != null) {
 3             ConnectivityManager mConnectivityManager = (ConnectivityManager) context
 4                     .getSystemService(Context.CONNECTIVITY_SERVICE);
 5             NetworkInfo mWiFiNetworkInfo = mConnectivityManager
 6                     .getNetworkInfo(ConnectivityManager.TYPE_WIFI);
 7             if (mWiFiNetworkInfo != null) {
 8                 return mWiFiNetworkInfo.isAvailable();
 9             }
10         }
11         return false;
12     }

3.判断MOBILE网络是否可用

 1     public boolean isMobileConnected(Context context) {
 2         if (context != null) {
 3             ConnectivityManager mConnectivityManager = (ConnectivityManager) context
 4                     .getSystemService(Context.CONNECTIVITY_SERVICE);
 5             NetworkInfo mMobileNetworkInfo = mConnectivityManager
 6                     .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
 7             if (mMobileNetworkInfo != null) {
 8                 return mMobileNetworkInfo.isAvailable();
 9             }
10         }
11         return false;
12     }

4.判断网络类型

 1  //返回值 -1：没有网络  1：WIFI网络2：wap网络3：net网络  
 2     public static int GetNetype(Context context) {
 3         int netType = -1;
 4         ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
 5         NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
 6         if (networkInfo == null) {
 7             return netType;
 8         }
 9         int nType = networkInfo.getType();
10         if (nType == ConnectivityManager.TYPE_MOBILE) {
11             if (networkInfo.getExtraInfo().toLowerCase().equals("cmnet")) {
12                 netType = 3;
13             } else {
14                 netType = 2;
15             }
16         } else if (nType == ConnectivityManager.TYPE_WIFI) {
17             netType = 1;
18         }
19         return netType;
20     }

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原文地址：https://www.cnblogs.com/lizhanqi/p/5715362.html