NetUtils网络连接工具类

import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class NetUtils {

   /**
    * 获得网络连接是否可用
    * @param context
    * @return
    */
   public static boolean hasNetwork(Context context) {
      ConnectivityManager con = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
      NetworkInfo workinfo = con.getActiveNetworkInfo();
      if (workinfo == null || !workinfo.isAvailable()) {
         return false;
      }
      return true;
   }

   /**
    * 判断是否是wifi连接
    */
   public static boolean checkWifiState(Context context) {
      boolean isWifiConnect = true;
      ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
      NetworkInfo[] networkInfos = cm.getAllNetworkInfo();
      for (int i = 0; i < networkInfos.length; i++) {
         if (networkInfos[i].getState() == NetworkInfo.State.CONNECTED) {
            if (networkInfos[i].getType() == cm.TYPE_MOBILE) {
               isWifiConnect = false;
            }
            if (networkInfos[i].getType() == cm.TYPE_WIFI) {
               isWifiConnect = true;
            }
         }
      }
      return isWifiConnect;
   }

   /**
    * 打开网络设置界面
    */
   public static void openNet(Activity activity) {
      Intent intent = new Intent("/");
      ComponentName cm = new ComponentName("com.android.settings", "com.android.settings.WirelessSettings");
      intent.setComponent(cm);
      intent.setAction("android.intent.action.VIEW");
      activity.startActivityForResult(intent, 0);
   }
}