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\n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<headers.length; 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();            }}

在Android上建立GPRS连接

    private boolean openDataConnection() {        // Set up data connection.        DataConnection conn = DataConnection.getInstance();                    if (connectMode == 0) {                ret = conn.openConnection(mContext, "cmwap", "cmwap", "cmwap");            } else {                ret = conn.openConnection(mContext, "cmnet", "", "");            }    }

android下实现WAP和NET的自适应

import java.net.HttpURLConnection;import java.net.InetSocketAddress;import java.net.URL;/** *  下载器 */public class DownloadUtil { private static final String TAG = "Downloader"; /**  * @return InputStream 下载  */ public static HttpURLConnection download(String url) {  HttpURLConnection conn = null;  try {   String proxyHost = android.net.Proxy.getDefaultHost();   if (proxyHost != null) {//如果是wap方式，要加网关    java.net.Proxy p = new java.net.Proxy(java.net.Proxy.Type.HTTP, new InetSocketAddress(      android.net.Proxy.getDefaultHost(), android.net.Proxy.getDefaultPort()));    conn = (HttpURLConnection) new URL(url).openConnection(p);   } else {    conn = (HttpURLConnection) new URL(url).openConnection();   }   // conn.setReadTimeout(5000);   conn.setConnectTimeout(10000);   conn.setRequestMethod("GET");   conn.setRequestProperty(     "Accept",     "image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*");   conn.setRequestProperty("Accept-Language", "zh-CN");   conn.setRequestProperty("Referer", url);   conn.setRequestProperty("Charset", "UTF-8");   conn.setRequestProperty(     "User-Agent",     "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)");   conn.setRequestProperty("Connection", "Keep-Alive");   conn.connect();   if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {    return conn;   }  } catch (Exception e) {   e.printStackTrace();  }  return null; }}

Android 判断网络状态
在使用Android连接网络的时候，并不是每次都能连接到网络，在这个时候，我们最好是在程序启动的时候对网络的状态进行一下判断，如果没有网络则进行即时提醒用户进行设置。
要判断网络状态，首先需要有相应的权限，下面为权限代码：
即允许访问网络状态：
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
下面为判断代码：

private boolean NetWorkStatus() {boolean netSataus = false;        ConnectivityManager cwjManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);        cwjManager.getActiveNetworkInfo();if (cwjManager.getActiveNetworkInfo() != null) {            netSataus = cwjManager.getActiveNetworkInfo().isAvailable();        }if (netSataus) {            Builder b = new AlertDialog.Builder(this).setTitle("没有可用的网络")                    .setMessage("是否对网络进行设置？");            b.setPositiveButton("是", new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog, int whichButton) {                    Intent mIntent = new Intent("/");                    ComponentName comp = new ComponentName("com.android.settings","com.android.settings.WirelessSettings");                    mIntent.setComponent(comp);                    mIntent.setAction("android.intent.action.VIEW");                    startActivityForResult(mIntent,0);  // 如果在设置完成后需要再次进行操作，可以重写操作代码，在这里不再重写                }            }).setNeutralButton("否", new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog, int whichButton) {                    dialog.cancel();                }            }).show();        }return netSataus;    }//通过上面的代码即可完成对网络状态的判断！具体怎么自己选择网络进行设置，还没有弄明白，等弄明白了，再写！