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！