Android Open Source - infinite-grid H T T P Request

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License

The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2014 Kenneth Maffei/*w ww .ja v a  2s  .com*/
 *
 * 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 com.kennethmaffei.infinitegrid;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Map;

import javax.net.ssl.HttpsURLConnection;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

/**
 * 
 * @author Kenneth Maffei
 * General Purpose class for several types of HTTP requests
 *
 */

public class HTTPRequest {
  
  public boolean isNetworkAvailable() {
      ConnectivityManager cm  = (ConnectivityManager)MainActivity.context.getSystemService(Context.CONNECTIVITY_SERVICE);
      NetworkInfo[] info = cm.getAllNetworkInfo();
      
      //If no network is available networkInfo will be null
      //Otherwise check if we are connected
      if (info != null) {
        for (int i = 0; i<info.length; i++){
          if (info[i].getState() == NetworkInfo.State.CONNECTED)
            return true;
        }
      }
      return false;
  }

  /**
   * Makes a REST GET call
   * 
   * @param properties - Associated array of header properties
   * @return JSON String
   */
  public String RESTGet(HashMap<String, String> properties) {
    /**
    * -H "X-Parse-Application-Id: kU0ija2xJOPy61EHr8uCCV5gyXkr7tpK4b8VCX5j" \
    * -H "X-Parse-REST-API-Key: LvvOSjEX4r0fvHWIJRzR1CcueHZLRWZOqUcRPxSW" \
    * -H "Content-Type: application/json" \     
    **/
    
    String result = "";
      
    if(!isNetworkAvailable()) {
      return null;
    }
    
    InputStream is = null;
    HttpsURLConnection urc = null;
    try {
       URL url = new URL(Constants.RECORD_URL);
       urc = (HttpsURLConnection)url.openConnection();
       for(Map.Entry<String, String> entry:properties.entrySet())
         urc.setRequestProperty((String)entry.getKey(), (String)entry.getValue());
       
       urc.setConnectTimeout(Constants.CONNECTION_TIMEOUT);
       urc.setReadTimeout(Constants.REQUEST_TIMEOUT);
       urc.setRequestMethod("GET");
           urc.setDoInput(true);
           urc.connect();
           is = urc.getInputStream();

           BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8") );
           String data = null;
           while ((data = reader.readLine()) != null)
             result+= data;

       is.close();
     }
     catch (Exception e) {
       try {
        if(is != null)
          is.close();
      }
      catch(IOException io) {
        
      }
     } 
    finally {
      if(urc != null)
        urc.disconnect();
    }
    return result;
  }
  
  /**
   * Gets the image from a url
   * 
   * @param urlString - the url where the image resides
   * @return a Bitmap object for the image
   */
  public Bitmap getImage(String urlString) {
    Bitmap image = null;
      try {
          image = BitmapFactory.decodeStream(new URL(urlString).openConnection().getInputStream());
      } 
      catch (Exception e) {
          
      }
      return image;
  }
  
  /**
   * Gets arbitrary data from a url
   * 
   * @param urlString - the url we are retrieving data from
   */
  public byte[] getData(String urlString) {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    
    InputStream is = null;
    URLConnection urc = null;
    try {
      URL url = new URL(urlString);
      urc = url.openConnection();
      urc.setConnectTimeout(Constants.CONNECTION_TIMEOUT);
      urc.setReadTimeout(Constants.REQUEST_TIMEOUT);
      is = urc.getInputStream();
      
      int size = 1024;           
      byte[] buf = new byte[size];
      
      int len = 0;
      while(((len = is.read(buf, 0, size)) > 0))                 
        baos.write(buf, 0, len);
      
      is.close();
    }
    catch (Exception e) {
       try {
        if(is != null)
          is.close();
      }
      catch(IOException io) {
        
      }
     } 

    //Return buffer
    return baos.toByteArray();
  }
}

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