[黑马show] android 判断网络状态

android 判断网络状态

[java] view plaincopy
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

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

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[黑马show] android 判断网络状态

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