//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", ""); 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 resourceshttpclient.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 .HttpURLConnection;import .InetSocketAddress;import .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 = .Proxy.getDefaultHost();if (proxyHost != null) {//如果是wap方式，要加网关.Proxy p = new .Proxy(.Proxy.Type.HTTP, new InetSocketAddress(.Proxy.getDefaultHost(), .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！
