Access a Web service using GET : Service « Network « Android

1. Android
2. Network
3. Service

Access a Web service using GET

  

package app.test;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class Test extends Activity {
  ImageView img;

  private class BackgroundTask extends AsyncTask<String, Void, Bitmap> {
    protected Bitmap doInBackground(String... url) {
      // ---download an image---
      Bitmap bitmap = DownloadImage(url[0]);
      try {
        Thread.sleep(3000);
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
      return bitmap;
    }

    protected void onPostExecute(Bitmap bitmap) {
      ImageView img = (ImageView) findViewById(R.id.img);
      img.setImageBitmap(bitmap);
    }
  }

  private InputStream OpenHttpConnection(String urlString) throws IOException {
    InputStream in = null;
    int response = -1;

    URL url = new URL(urlString);
    URLConnection conn = url.openConnection();

    if (!(conn instanceof HttpURLConnection))
      throw new IOException("Not an HTTP connection");
    try {
      HttpURLConnection httpConn = (HttpURLConnection) conn;
      httpConn.setAllowUserInteraction(false);
      httpConn.setInstanceFollowRedirects(true);
      httpConn.setRequestMethod("GET");
      httpConn.connect();
      response = httpConn.getResponseCode();
      if (response == HttpURLConnection.HTTP_OK) {
        in = httpConn.getInputStream();
      }
    } catch (Exception ex) {
      throw new IOException("Error connecting");
    }
    return in;
  }

  private Bitmap DownloadImage(String URL) {
    Bitmap bitmap = null;
    InputStream in = null;
    try {
      in = OpenHttpConnection(URL);
      bitmap = BitmapFactory.decodeStream(in);
      in.close();
    } catch (IOException e1) {
      Toast.makeText(this, e1.getLocalizedMessage(), Toast.LENGTH_LONG)
          .show();
      e1.printStackTrace();
    }
    return bitmap;
  }

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    Button btnOpen = (Button) findViewById(R.id.Button01);
    btnOpen.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        new BackgroundTask().execute("http://yourHost.com/1.jpg");
        String str = DownloadText("http://yourHost.com/a.rss");
        Toast.makeText(getBaseContext(), str, Toast.LENGTH_SHORT)
            .show();
        
        WordDefinition("Apple");
      }
    });
  }

  private String DownloadText(String URL) {
    int BUFFER_SIZE = 2000;
    InputStream in = null;
    try {
      in = OpenHttpConnection(URL);
    } catch (IOException e1) {
      e1.printStackTrace();
      return "";
    }

    InputStreamReader isr = new InputStreamReader(in);
    int charRead;
    String str = "";
    char[] inputBuffer = new char[BUFFER_SIZE];
    try {
      while ((charRead = isr.read(inputBuffer)) > 0) {
        String readString = String.copyValueOf(inputBuffer, 0, charRead);
        str += readString;
        inputBuffer = new char[BUFFER_SIZE];
      }
      in.close();
    } catch (IOException e) {
      e.printStackTrace();
      return "";
    }
    return str;
  }

  private void WordDefinition(String word) {
    InputStream in = null;
    try {
      in = OpenHttpConnection("http://services.aonaware.com/DictService/DictService.asmx/Define?word="+ word);
      Document doc = null;
      DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
      DocumentBuilder db;
      try {
        db = dbf.newDocumentBuilder();
        doc = db.parse(in);
      } catch (Exception e) {
        e.printStackTrace();
      }
      doc.getDocumentElement().normalize();
      // ---retrieve all the <Definition> nodes---
      NodeList definitionElements = doc.getElementsByTagName("Definition");
      String strDefinition = "";
      for (int i = 0; i < definitionElements.getLength(); i++) {
        Node itemNode = definitionElements.item(i);
        if (itemNode.getNodeType() == Node.ELEMENT_NODE) {
          Element definitionElement = (Element) itemNode;
          NodeList wordDefinitionElements = (definitionElement)
              .getElementsByTagName("WordDefinition");
          strDefinition = "";
          for (int j = 0; j < wordDefinitionElements.getLength(); j++) {
            Element wordDefinitionElement = (Element) wordDefinitionElements
                .item(j);
            NodeList textNodes = ((Node) wordDefinitionElement)
                .getChildNodes();
            strDefinition += ((Node) textNodes.item(0))
                .getNodeValue() + ". ";
          }
          Toast.makeText(getBaseContext(), strDefinition,
              Toast.LENGTH_SHORT).show();
        }
      }
    } catch (IOException e1) {
      e1.printStackTrace();
    }
  }
}
//main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >

<ImageView 
    android:id="@+id/img"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center" />    

<Button 
    android:text="Download Content" 
    android:id="@+id/Button01" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" />

</LinearLayout>

   
    
  

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