HttpSingleton.java

package com.google.mcommerce.sample.android.chapter11.http;

// This file is CustomHttpClient.java
import org.apache.http.HttpVersion;
import org.apache.http.client.HttpClient;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.params.ConnManagerParams;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.HTTP;

public class HttpSingleton {
	private static HttpClient customHttpClient;

	/** A private Constructor prevents any other class from instantiating. */
	private HttpSingleton() {
	}

	public static synchronized HttpClient getHttpClient() {
		if (customHttpClient == null) {
			HttpParams params = new BasicHttpParams();
			HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
			HttpProtocolParams.setContentCharset(params,
					HTTP.DEFAULT_CONTENT_CHARSET);
			HttpProtocolParams.setUseExpectContinue(params, true);

			HttpProtocolParams
					.setUserAgent(
							params,
							"Mozilla/5.0 (Linux; U; Android 2.2.1; en-us; Nexus One Build/FRG83) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1");

			ConnManagerParams.setTimeout(params, 1000);

			HttpConnectionParams.setConnectionTimeout(params, 5000);
			HttpConnectionParams.setSoTimeout(params, 10000);

			SchemeRegistry schReg = new SchemeRegistry();
			schReg.register(new Scheme("http", PlainSocketFactory
					.getSocketFactory(), 80));
			schReg.register(new Scheme("https", SSLSocketFactory
					.getSocketFactory(), 443));
			ClientConnectionManager conMgr = new ThreadSafeClientConnManager(
					params, schReg);

			customHttpClient = new DefaultHttpClient(conMgr, params);
		}
		return customHttpClient;
	}

	public Object clone() throws CloneNotSupportedException {
		throw new CloneNotSupportedException();
	}
}