0. 前言
无论是移动、联通还是电信,都至少提供了两种类型的的APN,WAP方式和NET方式。
其中NET方式跟WIFI方式一样,无需任何设置,可*访问所有类型网站,而WAP方式需要手机先设置代理服务器和端口号等信息,并且只能访问HTTP协议类型的网站。本篇将介绍如何在代码中实现WAP方式联网。
1. 准备知识
国内三大运营商关于WAP和NET的信息如下:
(1)移动的WAP名称是CMWAP,NET名称是CMNET;
(2)联通的WAP名称是UNIWAP,NET名称是UNINET;联通3G的WAP名称是3GWAP,NET名称是3GNET;
(3)电信的WAP名称是CTWAP,NET名称是CTNET;
其中三家运营商WAP端口均为80,移动和联通的WAP代理服务器都是10.0.0.172,电信的WAP代理服务器是10.0.0.200。
在Android系统中,对于获取手机的APN设置,需要通过ContentProvider来进行数据库查询,查询的URI地址如下。
//取得全部的APN列表:content://telephony/carriers;
//取得当前设置的APN:content://telephony/carriers/preferapn;
//取得current=1的APN:content://telephony/carriers/current;
2. 代码中实现WAP联网
下面我们的代码就是使用APNManager类获取当前首选的APN设置,并继承HttpClient实现我们自己的代理ProxyHttpClient类。
首先来看下APNManager类的实现,这个类的主要功能是获得APN的代理服务器和端口号。
import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri; public class APNManager { public static final Uri PREFERRED_APN_URI; private String mApn; // 接入点名称 private String mPort; // 端口号 private String mProxy; // 代理服务器 private boolean mUseWap; // 是否正在使用WAP static { //取得当前设置的APN
PREFERRED_APN_URI = Uri.parse("content://telephony/carriers/preferapn");
} public APNManager(Context context) {
checkNetworkType(context);
} /**
* 获得当前设置的APN相关参数
* @param context
*/
private void checkApn(Context context) {
ContentResolver contentResolver = context.getContentResolver();
Uri uri = PREFERRED_APN_URI;
String[] apnInfo = new String[3];
apnInfo[0] = "apn";
apnInfo[1] = "proxy";
apnInfo[2] = "port";
//使用ContentResolver获得游标对象,之后就是查询操作了
//分别查询当前手机所设置的APN、Proxy和Port
//如果手机的Proxy没有设置,则需要根据APN来决定当前应该连接的代理服务器地址和端口号
Cursor cursor = contentResolver.query(uri, apnInfo, null, null, null);
if (cursor != null) {
while (cursor.moveToFirst()) {
this.mApn = cursor.getString(cursor.getColumnIndex("apn"));
this.mProxy = cursor.getString(cursor.getColumnIndex("proxy"));
this.mPort = cursor.getString(cursor.getColumnIndex("port")); // 代理为空
if ((this.mProxy == null) || (this.mProxy.length() <= 0)) {
String apn = this.mApn.toUpperCase(); // 中国移动WAP设置:APN:CMWAP;代理:10.0.0.172;端口:80
// 中国联通WAP设置:APN:UNIWAP;代理:10.0.0.172;端口:80
// 中国联通WAP设置(3G):APN:3GWAP;代理:10.0.0.172;端口:80
if ((apn.equals("CMWAP")) || (apn.equals("UNIWAP")) || (apn.equals("3GWAP"))) {
this.mUseWap = true;
this.mProxy = "10.0.0.172";
this.mPort = "80";
break;
} // 中国电信WAP设置:APN(或者接入点名称):CTWAP;代理:10.0.0.200;端口:80
if (apn.equals("CTWAP")) {
this.mUseWap = true;
this.mProxy = "10.0.0.200";
this.mPort = "80";
break;
} }
this.mPort = "80";
this.mUseWap = true;
break;
} } this.mUseWap = false;
cursor.close();
} /**
* 检测当前使用的网络类型是WIFI还是WAP
* @param context
*/
private void checkNetworkType(Context context) {
NetworkInfo networkInfo = ((ConnectivityManager) context
.getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE)).getActiveNetworkInfo();
if (networkInfo != null) {
if (!"wifi".equals(networkInfo.getTypeName().toLowerCase())) {
checkApn(context);
return;
}
this.mUseWap = false;
}
} /**
* 判断当前网络连接状态
* @param context
* @return
*/
public static boolean isNetworkConnected(Context context) {
NetworkInfo networkInfo = ((ConnectivityManager) context
.getApplicationContext().getSystemService("connectivity"))
.getActiveNetworkInfo();
if (networkInfo != null) {
return networkInfo.isConnectedOrConnecting();
}
return false;
} public String getApn() {
return this.mApn;
} public String getProxy() {
return this.mProxy;
} public String getProxyPort() {
return this.mPort;
} public boolean isWapNetwork() {
return this.mUseWap;
}
}
通过APNManager类获取到或者设置好当前手机的WAP设置的代理和端口之后,就可以构造我们自己的代理类了,这个类定义为ProxyHttpClient,在该类的构造函数中,首先获得APNManager的实例,然后获取到APNManager类中的信息,即获取代理服务器proxy和端口值port,通过这两个参数构造HttpHost实例,并将host实例设置为ConnRouteParams.DEFAULT_PROXY的值。具体实现如下:
import android.content.Context;
import android.text.TextUtils;
import android.util.Log; import org.apache.http.HttpHost;
import org.apache.http.conn.params.ConnRouteParams;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams; public class ProxyHttpClient extends DefaultHttpClient { private static final int HTTP_TIMEOUT_MS = 30 * 1000; private static final int BUFFER_SIZE = 1024 * 8; private static final String TAG = ProxyHttpClient.class.getSimpleName(); private RuntimeException mLeakedException = new IllegalStateException("ProxyHttpClient created and never closed"); private String mPort; private String mProxy; private boolean mUseWap; public ProxyHttpClient(Context context) {
this(context, null, null);
} public ProxyHttpClient(Context context, APNManager manager) {
this(context, null, manager);
} public ProxyHttpClient(Context context, String userAgent) {
this(context, userAgent, null);
} public ProxyHttpClient(Context context, String userAgent, APNManager manager) {
if (manager == null) {
manager = new APNManager(context);
} this.mUseWap = manager.isWapNetwork();
this.mProxy = manager.getProxy();
this.mPort = manager.getProxyPort();
if (this.mUseWap) {
HttpHost host = new HttpHost(this.mProxy, Integer.valueOf(this.mPort).intValue());
getParams().setParameter(ConnRouteParams.DEFAULT_PROXY, host); // 设置代理
}
HttpConnectionParams.setConnectionTimeout(getParams(), HTTP_TIMEOUT_MS);
HttpConnectionParams.setSoTimeout(getParams(), HTTP_TIMEOUT_MS);
HttpConnectionParams.setSocketBufferSize(getParams(), BUFFER_SIZE);
if (!TextUtils.isEmpty(userAgent)) {
HttpProtocolParams.setUserAgent(getParams(), userAgent);
}
} public void close() {
if (this.mLeakedException != null) {
getConnectionManager().shutdown();
this.mLeakedException = null;
}
} protected HttpParams createHttpParams() {
HttpParams params = super.createHttpParams();
HttpProtocolParams.setUseExpectContinue(params, false);
return params;
} protected void finalize() throws Throwable {
super.finalize();
if (this.mLeakedException != null) {
Log.e(TAG, "Leak found", this.mLeakedException);
}
}
}