Android Open Source - Android-CleanArchitecture Api Connection

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License

The source code is released under:

Apache License

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Java Source Code

/**
 * Copyright (C) 2014 android10.org. All rights reserved.
 * @author Fernando Cejas (the android10 coder)
 *///w w w. j ava  2  s. co  m
package com.fernandocejas.android10.sample.data.net;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.concurrent.Callable;

/**
 * Api Connection class used to retrieve data from the cloud.
 * Implements {@link java.util.concurrent.Callable} so when executed asynchronously can
 * return a value.
 */
public class ApiConnection implements Callable<String> {

  private static final String CONTENT_TYPE_LABEL = "Content-Type";
  private static final String CONTENT_TYPE_VALUE_JSON = "application/json; charset=utf-8";

  public static final String REQUEST_METHOD_GET = "GET";

  private URL url;
  private String requestVerb;
  private int responseCode = 0;
  private String response = "";

  private ApiConnection(String url, String requestVerb) throws MalformedURLException {
    this.url = new URL(url);
    this.requestVerb = requestVerb;
  }

  public static ApiConnection createGET(String url) throws MalformedURLException {
    return new ApiConnection(url, REQUEST_METHOD_GET);
  }

  /**
   * Do a request to an api asynchronously.
   * It should not be executed in the main thread of the application.
   *
   * @return A string response
   */
  public String requestSyncCall() {
    connectToApi();
    return response;
  }

  private void connectToApi() {
    HttpURLConnection urlConnection = null;

    try {
      urlConnection = (HttpURLConnection) url.openConnection();
      setupConnection(urlConnection);

      responseCode = urlConnection.getResponseCode();
      if (responseCode == HttpURLConnection.HTTP_OK) {
        response = getStringFromInputStream(urlConnection.getInputStream());
      } else { response = getStringFromInputStream(urlConnection.getErrorStream()); }
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      if (urlConnection != null) { urlConnection.disconnect(); }
    }
  }

  private String getStringFromInputStream(InputStream inputStream) {

    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
    StringBuilder stringBuilderResult = new StringBuilder();

    String line;
    try {
      while ((line = bufferedReader.readLine()) != null) {
        stringBuilderResult.append(line);
      }
      return stringBuilderResult.toString();
    } catch (IOException e) {
      e.printStackTrace();
      return "";
    }
  }

  private void setupConnection(HttpURLConnection connection) throws IOException {
    if (connection != null) {
      connection.setRequestMethod(requestVerb);
      connection.setReadTimeout(10000);
      connection.setConnectTimeout(15000);
      connection.setDoInput(true);
      connection.setRequestProperty(CONTENT_TYPE_LABEL, CONTENT_TYPE_VALUE_JSON);
    }
  }

  @Override public String call() throws Exception {
    return requestSyncCall();
  }
}

Java Source Code List