Android中使用cmwap接入点访问互联网的问题及解决办法

/** * //检查网络 是否正常

*/

private boolean checkNet(){

ConnectivityManager manager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);

netWrokInfo = manager.getActiveNetworkInfo();

if (netWrokInfo == null || !netWrokInfo.isAvailable()) {

Toast.makeText(this, "当前的网络不可用，请开启网络", Toast.LENGTH_LONG).show();

return false;

}

else if(netWrokInfo.getTypeName().equals("MOBILE")& netWrokInfo.getExt raInfo().equals("cmwap")){

Toast.makeText(this, "cmwap网络不可用，请选择cmnet网络", Toast.LENGTH_LONG).show();

return false;

}else{

return true;

}

}

/**

*Android 使用cmwap GPRS 方式联网

*/

CMWAP和CMNET只是中国移动为其划分的两个GPRS接入方式。中国移动对CMWAP作了一定的限制，主要表现在CMWAP接入时只能访问 GPRS网络内的IP(10.*.*.*)，而无法通过路由访问Internet，我们用CMWAP浏览Internet上的网页 就是通过WAP网关协议或它提供的HTTP代理服务实现的。 因此，只有满足以下两个条件的应用 才能在中国移动的CMWAP接入方式下正常工作：

1.应用程序 的网络请求基于HTTP协议。

2.应用程序 支持HTTP代理协议或WAP网关协议。

这也就是为什么我们的G1无法正常用CMWAP的原因。

一句话：CMWAP是移动限制的，理论上只能上WAP网，而CMNET可以用GPRS浏览WWW

方法一:

URL url = new URL("http://10.0.0.172/img/baidu_logo.gif");

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setRequestProperty("X-Online-Host", "www.baidu.com");

conn.setDoInput(true);

conn.connect();

InputStream is = conn.getInputStream();

bitmap = BitmapFactory.decodeStream(is);

is.close();

conn.disconnect();

方法二:

CODE:

package org.apache.http.examp les.client;

import org.apache.http.Header;import org.apache.http.HttpEntity;

import org.apache.http.HttpHost;

import org.apache.http.HttpResponse;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.conn.params.ConnRoutePNames;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.util.EntityUtils;

public class ClientExecuteProxy {

public static void main(String [] args)throws Exception {

HttpHost proxy = new HttpHost( "10.0.0.172", 80, "http");

HttpHost target = new HttpHost("YOUR_TARGET_IP", 80, "http");

DefaultHttpClient httpclient = new DefaultHttpClient();

httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);

HttpGet req = new HttpGet("/");

System.out.println("executing request to " + target + " via " + proxy);

HttpResponse rsp = httpclient.execute(target, req);

HttpEntity entity = rsp.getEntity();

System.out.println("----------------------------------------");

System.out.println(rsp.getStatusLine());

Header[] headers = rsp.getAllHeaders();

for (int i = 0; i< i++)>

System.out.println(headers);

}

System.out.println("----------------------------------------");

if (entity != null) {

System.out.println(EntityUtils.toString(entity));

}

// When HttpClient instance is no longer needed,

// shut down the connection manager to ensure

// immediate deallocation of all system resources

httpclient.getConnectionManager().shutdown();

}

}