Android 判断网络状态实例详解

android 判断网络状态实例详解

实例代码

package com.example.android; 
 
import java.io.ioexception; 
import java.net.httpurlconnection; 
import java.net.inetaddress; 
import java.net.networkinterface; 
import java.net.socketexception; 
import java.net.url; 
import java.util.enumeration; 
 
import android.content.context; 
import android.net.connectivitymanager; 
import android.net.networkinfo; 
import android.telephony.telephonymanager; 
 
public class netstatus { 
 
  public static int net_cnnt_baidu_ok = 1; // 正常访问因特网状态 
  public static int net_cnnt_baidu_timeout = 2; // 无法访问因特网状态 
  public static int net_not_prepare = 3; // 网络未准备好 
  public static int net_error = 4; 
  private static int timeout = 3000; 
 
  /** 
   * 返回当前网络状态 
   * 
   * @param context 
   * @return 
   */ 
  public static int getnetstate(context context) { 
  try { 
    connectivitymanager connectivity = (connectivitymanager) context.getsystemservice(context.connectivity_service); 
    if (connectivity != null) { 
    networkinfo networkinfo = connectivity.getactivenetworkinfo(); 
    if (networkinfo != null) { 
      if (networkinfo.isavailable() && networkinfo.isconnected()) { 
      if (!connectionnetwork()) 
        return net_cnnt_baidu_timeout; 
      else 
        return net_cnnt_baidu_ok; 
      } else { 
      return net_not_prepare; 
      } 
    } 
    } 
  } catch (exception e) { 
  } 
  return net_error; 
  } 
 
  /** 
   * 拼百度地址 
   * 
   * @return 
   */ 
  private static boolean connectionnetwork() { 
  boolean result = false; 
  httpurlconnection httpurl = null; 
  try { 
    httpurl = (httpurlconnection) new url("http://www.baidu.com").openconnection(); 
    httpurl.setconnecttimeout(timeout); 
    httpurl.connect(); 
    result = true; 
  } catch (ioexception e) { 
  } finally { 
    if (null != httpurl) { 
    httpurl.disconnect(); 
    } 
    httpurl = null; 
  } 
  return result; 
  } 
 
  /** 
   * 判断当前网络是否是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; 
  } 
 
  /** 
   * 判断当前网络是否是wifi网络 
   * 
   * @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; 
  } 
 
  /** 
   * 判断当前网络是否是2g网络 
   * 
   * @param context 
   * @return boolean 
   */ 
  public static boolean is2g(context context) { 
  connectivitymanager connectivitymanager = (connectivitymanager) context.getsystemservice(context.connectivity_service); 
  networkinfo activenetinfo = connectivitymanager.getactivenetworkinfo(); 
  if (activenetinfo != null && (activenetinfo.getsubtype() == telephonymanager.network_type_edge 
      || activenetinfo.getsubtype() == telephonymanager.network_type_gprs  
      || activenetinfo.getsubtype() == telephonymanager.network_type_cdma)) { 
    return true; 
  } 
  return false; 
  } 
 
  /** 
   * 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); 
  } 
 
  /** 
   * 获得本机ip地址 
   * 
   * @return 
   */ 
  public static string gethostip() { 
  try { 
    for (enumeration<networkinterface> en = networkinterface.getnetworkinterfaces(); en.hasmoreelements();) { 
    networkinterface intf = en.nextelement(); 
    for (enumeration<inetaddress> ipaddr = intf.getinetaddresses(); ipaddr.hasmoreelements();) { 
      inetaddress inetaddress = ipaddr.nextelement(); 
      if (!inetaddress.isloopbackaddress()) { 
      return inetaddress.gethostaddress(); 
      } 
    } 
    } 
  } catch (socketexception ex) { 
  } catch (exception e) { 
  } 
  return null; 
  } 
 
  /** 
   * 获取本机串号imei 
   * 
   * @param context 
   * @return 
   */ 
  public static string getimei(context context) { 
  telephonymanager telephonymanager = (telephonymanager) context.getsystemservice(context.telephony_service); 
  return telephonymanager.getdeviceid(); 
  } 
} 

添加权限：访问网络权限

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

感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！