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"/>  

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