[1] 在AndroidManifest 添加访问权限
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
[2] 获取当前手机的网络状态
package com.example.administrator.mydemoapp.client;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.telephony.TelephonyManager;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
import java.net.URL;
/**
* Created by Administrator on 2017/9/2
*/
public class NetworkUtil {
public static int NET_CNNT_BAIDU_OK = 1;
public static int NET_CNNT_BAIDU_TIMEOUT = 2;
public static int NET_NOT_PERPARE = 3;
public static int NET_ERROR;
private static int TIMEOUT=3000;
/**
* 检查网络
* @param context
* @return
*/
public static boolean isNetworkAvailable(Context context){
ConnectivityManager manager = (ConnectivityManager)context.getApplicationContext().getSystemService(
Context.CONNECTIVITY_SERVICE);
if (null == manager)
return false;
NetworkInfo info = manager.getActiveNetworkInfo();
if (null == info || info.isAvailable())
return false;
return true;
}
/**
* 获取IP地址
* @return
*/
public static String getLocalIpAddress(){
String ret = "";
try {
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();){
NetworkInterface networkInterface=en.nextElement();
for (Enumeration<InetAddress> enumIpAddr = networkInterface.getInetAddresses(); enumIpAddr.hasMoreElements();){
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress()){
ret = inetAddress.getHostAddress().toString();
}
}
}
}catch (SocketException ex){
ex.printStackTrace();
}
return ret;
}
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_PERPARE;
}
}
}
}catch (Exception e){
e.printStackTrace();
}
return NET_ERROR;
}
/**
* ping "http://www.baidu.com"
* @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;
}
/**
* 判断是否是3g网络
* @param context
* @return
*/
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;
}
/**
* 判断是不是WIFI网络
* @param context
* @return
*/
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;
}
/**
* 判断是不是2G
* @param context
* @return
*/
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是否已连接上
* @param context
* @return
*/
public static boolean isWifiEnabled(Context context){
ConnectivityManager connectivityManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
TelephonyManager telephonyManager = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
return ((connectivityManager.getActiveNetworkInfo() != null
&& connectivityManager.getActiveNetworkInfo().getState() == NetworkInfo.State.CONNECTED
|| telephonyManager.getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS));
}
}
[3] 网络访问前调用
if (NetworkUtil.isNetworkAvailable(context)){
//to do
}else{
//to do
}
[4] 需要对手机网络类别做判断的情形
(1) 下载视频，软件，文档等大文件。
(2) 缓存。
(3) 上传、发送文件给好友。
[5] 总结
大四了，看着新生入校，不知不觉我已走过了3年的青春。面对校招，不慌不乱，稳中求进。
代码学习了大神，感谢分享。
