Android Open Source - android-http Http Example Activity

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2012, 2013 the diamond:dogs|group
 *//from ww w.  ja  v  a  2s. c om
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
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.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
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.HttpService;
import at.diamonddogs.service.net.HttpService.HttpServiceBinder;
import at.diamonddogs.service.processor.HeadRequestProcessor;
import at.diamonddogs.service.processor.ServiceProcessorMessageUtil;

/**
 * Basic HTTP request example
 */
public class HttpExampleActivity extends Activity {

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

  /**
   * The service connection that will be used to connect with
   * {@link HttpService}
   */
  private HttpExampleConnection serviceConnection;

  /**
   * An instance of {@link HttpService} that can be used to run web requests
   */
  private HttpService httpService;

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

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

  /**
   * {@inheritDoc}
   */
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.httpexampleactivity);
    text = (TextView) findViewById(R.id.httpexampleactivity_text);
    temperature = (TextView) findViewById(R.id.httpexampleactivity_temperature);
  }

  /**
   * Binds the {@link HttpService} if the {@link HttpExampleConnection} is
   * null
   */
  @Override
  protected void onResume() {
    super.onResume();
    if (serviceConnection == null) {
      Intent i = new Intent(this, HttpService.class);
      bindService(i, serviceConnection = new HttpExampleConnection(), BIND_AUTO_CREATE);
    }
  }

  /**
   * Unbinds the {@link HttpService} if the {@link HttpExampleConnection} is
   * not null
   */
  @Override
  protected void onPause() {
    super.onPause();
    if (serviceConnection != null) {
      unbindService(serviceConnection);
      serviceConnection = null;
    }
  }

  /**
   * Constructs and runs the weather web request
   */
  @SuppressWarnings("unchecked")
  private void runWebRequest() {
    String weatherUrl = getWeatherUrl("Austria", "Vienna");
    LOGGER.info("URL: " + weatherUrl);
    // --- SYNC WEB REQUEST

    // sync webrequest POC, usually you should not execute synchronous web
    // requests on the main thread. The result of this call will be logged,
    // but not displayed in the UI

    WebRequest syncWebRequest = new WebRequest();
    syncWebRequest.setUrl(weatherUrl);
    syncWebRequest.setRequestType(Type.HEAD);

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

    Map<String, List<String>> headers = (Map<String, List<String>>) httpService.runSynchronousWebRequest(syncWebRequest).getPayload();
    if (headers != null) {
      for (String key : headers.keySet()) {
        LOGGER.error("KEY -> " + key);
        for (String value : headers.get(key)) {
          LOGGER.error("    VALUE -> " + value);
        }
      }
    } else {
      Toast.makeText(this, "Error while optaining headers", Toast.LENGTH_SHORT).show();
    }

    // --- ASYNC WEB REQUEST

    WebRequest asyncRequest = new WebRequest();
    // takes a String or URL object!
    asyncRequest.setUrl(weatherUrl);

    // The processorid tells HttpService what to do once a web reply has
    // been received.
    // You MUST set a processor id and the processor needs to be registered
    // with HttpService.
    // You may use DummyProcessor.ID to circumvent processor implementation
    asyncRequest.setProcessorId(WeatherProcessor.ID);

    // run the web request, WeatherHandler will receive a callback once the
    // web request has been finished
    httpService.runWebRequest(new WeatherHandler(), asyncRequest);
  }

  /**
   * 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();
  }

  /**
   * A Simple {@link ServiceConnection} to be used in conjunction with
   * {@link HttpService}
   */
  private final class HttpExampleConnection implements ServiceConnection {

    /**
     * {@inheritDoc}
     */
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
      if (service instanceof HttpServiceBinder) {
        // gaining access to the HttpService
        httpService = ((HttpServiceBinder) service).getHttpService();

        // registering the WeatherProcessor that will take care of
        // parsing the XML and returning a POJO containing weather
        // information
        if (!httpService.isProcessorRegistered(WeatherProcessor.ID)) {
          httpService.registerProcessor(new WeatherProcessor());
        }

        // registering the DummyProcessor, we need this processor for
        // our HEAD request
        if (!httpService.isProcessorRegistered(HeadRequestProcessor.ID)) {
          httpService.registerProcessor(new HeadRequestProcessor());
        }

        // run the webrequest once the processor has been registered
        runWebRequest();
      }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onServiceDisconnected(ComponentName name) {
    }

  }

  /**
   * This handler receives a callback once the web request has been processed.
   */
  private class WeatherHandler extends Handler {
    /**
     * {@inheritDoc}
     */
    @Override
    public void handleMessage(Message msg) {
      super.handleMessage(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()));

          // getting the http status code
          LOGGER.info("The HTTP status code is: " + ServiceProcessorMessageUtil.getHttpStatusCode(msg));
        } else {
          LOGGER.error("Error while fetching weather.", ServiceProcessorMessageUtil.getThrowable(msg));
          Toast.makeText(HttpExampleActivity.this, "Error fetching weather", Toast.LENGTH_LONG).show();
        }
      }

    }
  }
}

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