Android Open Source - android-http Http Ordered Async Assisiter Example Activity

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License

The source code is released under:

Apache License

Java Source Code

/**
 * Copyright 2013, the diamond:dogs|group
 *///from  w ww.j  av  a  2 s. c  o m
package at.diamonddogs.example.http.activity;

import java.util.List;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.os.Message;
import android.widget.TextView;
import android.widget.Toast;
import at.diamonddogs.data.dataobjects.WebRequest;
import at.diamonddogs.data.dataobjects.WebRequest.Type;
import at.diamonddogs.example.http.R;
import at.diamonddogs.example.http.dataobject.Weather;
import at.diamonddogs.example.http.processor.WeatherProcessor;
import at.diamonddogs.service.net.HttpOrderedAsyncAssister;
import at.diamonddogs.service.net.HttpOrderedAsyncAssister.HttpOrderedAsyncHandler2;
import at.diamonddogs.service.net.HttpOrderedAsyncAssister.HttpOrderedAsyncRequest;
import at.diamonddogs.service.net.HttpOrderedAsyncAssister.NextWebRequestDelegate;
import at.diamonddogs.service.net.HttpOrderedAsyncAssister.NoNextWebRequestDelegate;
import at.diamonddogs.service.processor.HeadRequestProcessor;
import at.diamonddogs.service.processor.ServiceProcessorMessageUtil;

/**
 * A simple example that illustrates how asynchronous {@link WebRequest}s can be
 * executed in order, according to certain conditions.
 */
public class HttpOrderedAsyncAssisiterExampleActivity extends Activity {

  private static final Logger LOGGER = LoggerFactory.getLogger(HttpServiceAssisterExampleActivity.class.getSimpleName());

  private HttpOrderedAsyncAssister assister;

  /**
   * Text view to display a weather string
   */
  private TextView text;

  /**
   * Text view to display the temperature
   */
  private TextView temperature;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.httporderedasyncassisterexampleactivity);
    assister = new HttpOrderedAsyncAssister(this);
    text = (TextView) findViewById(R.id.httporderedasyncassisiterexampleactivity_text);
    temperature = (TextView) findViewById(R.id.httporderedasyncassisiterexampleactivity_temperature);
  }

  /**
   * {@inheritDoc}
   */

  @Override
  protected void onResume() {
    super.onResume();
    assister.bindService();
    String weatherUrl = getWeatherUrl("Austria", "Vienna");
    LOGGER.info("URL: " + weatherUrl);
    WebRequest headRequest = getHeadRequest();
    // @formatter:off
    HttpOrderedAsyncRequest initialRequest = new HttpOrderedAsyncRequest(
        headRequest,
        new WeatherHandler(assister),
        new NextWebRequestDelegate() {
          @Override
          public HttpOrderedAsyncRequest getNextWebRequest(Message message) {
            Map<String, List<String>> header = (Map<String, List<String>>) message.obj;
            if (header != null) {
              if (header.containsKey("Content-Type") && header.get("Content-Type").get(0).equals("application/json; charset=utf-8")) {
                LOGGER.error("Content-Type is application/json; charset=utf-8, will run actual WebRequest now!");
                return new HttpOrderedAsyncRequest(
                    getWeatherRequest(),
                    new WeatherHandler(assister),
                    new NoNextWebRequestDelegate(),
                    new WeatherProcessor()
                );
              } else {
              LOGGER.error("Content-Type is notapplication/json; charset=utf-8 but " + header.get("Content-Type") + " not running any successive WebRequests!");
                return null;
              }
            } else {
              LOGGER.error("Headers are null, not sending WebRequest");
              return null;
            }
          }
        },
        new HeadRequestProcessor()
    );
    // @formatter:on
    assister.runRequests(initialRequest);
  }

  private WebRequest getHeadRequest() {
    WebRequest webRequest = new WebRequest();
    webRequest.setUrl(getWeatherUrl("Austria", "Vienna"));
    webRequest.setRequestType(Type.HEAD);

    // default header request processor
    webRequest.setProcessorId(HeadRequestProcessor.ID);

    // required for HEAD request
    webRequest.addHeaderField("Accept-Encoding", "gzip, deflate");
    return webRequest;
  }

  private WebRequest getWeatherRequest() {
    WebRequest webRequest = new WebRequest();
    webRequest.setUrl(getWeatherUrl("Austria", "Vienna"));
    webRequest.setRequestType(Type.GET);

    // default header request processor
    webRequest.setProcessorId(WeatherProcessor.ID);

    return webRequest;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void onPause() {
    super.onPause();
    assister.unbindService();
  }

  /**
   * Formats the openweathermap.org weather URL
   * 
   * @param country
   *            the country
   * @param city
   *            the city
   * @return the weather url for country & city
   */
  private String getWeatherUrl(String country, String city) {
    Uri u = Uri.parse("http://api.openweathermap.org/data/2.5/weather/");
    // @formatter:off
    u = u.buildUpon()
      .appendQueryParameter("q", city + "," + country)
      .appendQueryParameter("units", "metric")
    .build();
    // @formatter:on
    return u.toString();
  }

  /**
   * This handler receives a callback once the web request has been processed.
   */
  private class WeatherHandler extends HttpOrderedAsyncHandler2 {
    /**
     * @param arg0
     */
    public WeatherHandler(HttpOrderedAsyncAssister arg0) {
      super(arg0);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean onNextWebRequestComplete(Message msg) {
      if (ServiceProcessorMessageUtil.isFromProcessor(msg, HeadRequestProcessor.ID)) {
        return ServiceProcessorMessageUtil.isSuccessful(msg);
      } else {
        return false;
      }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onWebRequestChainCompleted(Message msg) {
      if (ServiceProcessorMessageUtil.isFromProcessor(msg, WeatherProcessor.ID)) {
        if (ServiceProcessorMessageUtil.isSuccessful(msg)) {
          Weather w = (Weather) msg.obj;
          text.setText(w.getText());
          temperature.setText(String.valueOf(w.getTemperature()));
        } else {
          Toast.makeText(HttpOrderedAsyncAssisiterExampleActivity.this, "Error fetching weather", Toast.LENGTH_LONG).show();
        }
      }
    }
  }
}

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