extends Application : Application « Core Class « Android

1. Android
2. Core Class
3. Application

extends Application

  


package app.test;

import org.apache.http.HttpVersion;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
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.BasicResponseHandler;
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;

import android.app.Activity;
import android.app.Application;
import android.os.Bundle;
class MyHttpClient extends Application {
  private HttpClient httpClient;
  @Override
  public void onCreate() {
    super.onCreate();
    httpClient = createHttpClient();
  }
  private HttpClient createHttpClient() {
    HttpParams params = new BasicHttpParams();
    HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
    HttpProtocolParams.setContentCharset(params,HTTP.DEFAULT_CONTENT_CHARSET);
    HttpProtocolParams.setUseExpectContinue(params, true);

    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);

    return new DefaultHttpClient(conMgr, params);
  }

  public HttpClient getHttpClient() {
    if (httpClient == null)
      httpClient = createHttpClient();
    return httpClient;
  }

  @Override
  public void onLowMemory() {
    super.onLowMemory();
    shutdownHttpClient();
  }

  @Override
  public void onTerminate() {
    super.onTerminate();
    shutdownHttpClient();
  }

  private void shutdownHttpClient() {
    if (httpClient != null && httpClient.getConnectionManager() != null) {
      httpClient.getConnectionManager().shutdown();
      httpClient = null;
    }
  }
}

public class Test extends Activity {
  private MyHttpClient app;
  private HttpClient httpClient;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    app = (MyHttpClient) this.getApplication();
    httpClient = app.getHttpClient();
    getHttpContent();
  }

  public void getHttpContent() {
    try {
      HttpGet request = new HttpGet("http://www.google.com/");
      HttpParams params = request.getParams();
      HttpConnectionParams.setSoTimeout(params, 60000); // 1 minute
      request.setParams(params);
      String page = httpClient.execute(request,
          new BasicResponseHandler());
      System.out.println(page);
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

   
    
  

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