Cara Membuat Http Connection pada Android

Cara Membuat Http Connection pada Android

Pada projeck ini kita akan menggunakan 1 file.xml dan 1 file.java

-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"

    android:scrollbars="vertical">

    <Button 

android:id="@+id/Button01" 

android:text="@string/button01" 

android:layout_height="wrap_content" 

android:layout_width="wrap_content">

</Button>

<Button android:id="@+id/Button02" 

android:layout_height="wrap_content" 

android:text="@string/button02" 

android:layout_width="wrap_content">

</Button>

<ImageView 

android:id="@+id/imageview01" 

android:layout_width="wrap_content" 

android:layout_height="wrap_content" 

android:cropToPadding="true" >

</ImageView>

<TextView  

    android:id="@+id/textview01"

    android:layout_width="fill_parent" 

    android:layout_height="wrap_content" />

</LinearLayout>

-HttpURLConnectionA.java

package com.bogotobogo.httpconnecta;

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.net.URLConnection;

import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class HttpURLConnectionA extends Activity {
    
private ProgressDialog progressDialog;
private Bitmap bitmap = null;
private String text = null;

/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        Button imageBtn = (Button)findViewById(R.id.Button01);
        Button textBtn = (Button)findViewById(R.id.Button02);
        
        imageBtn.setOnClickListener( new OnClickListener() {
public void onClick(View v) {
downloadImage("http://www.bogotobogo.com/images/smalltiger.gif");
}
        });
        
        textBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
downloadText("http://www.bogotobogo.com/android.html");
}
        });
    }
    
private void downloadImage(String urlStr) {
progressDialog = ProgressDialog.show(this, "", 
"Downloading Image from " + urlStr);
final String url = urlStr;

new Thread() {
public void run() {
InputStream in = null;
Message msg = Message.obtain();
msg.what = 1;
try {
    in = openHttpConnection(url);
    bitmap = BitmapFactory.decodeStream(in);
    Bundle b = new Bundle();
    b.putParcelable("bitmap", bitmap);
    msg.setData(b);
    in.close();
} catch (IOException e1) {
    e1.printStackTrace();
}
messageHandler.sendMessage(msg);
}
  }.start();
}

private void downloadText(String urlStr) {
progressDialog = ProgressDialog.show(this, "", 
"Download Text from " + urlStr);
final String url = urlStr;

new Thread () {
public void run() {
int BUFFER_SIZE = 2000;
        InputStream in = null;
        Message msg = Message.obtain();
        msg.what=2;
        try {
         in = openHttpConnection(url);
            
            InputStreamReader isr = new InputStreamReader(in);
            int charRead;
              text = "";
              char[] inputBuffer = new char[BUFFER_SIZE];

                  while ((charRead = isr.read(inputBuffer))>0)
                  {                    
                      String readString = 
                          String.copyValueOf(inputBuffer, 0, charRead);                    
                      text += readString;
                      inputBuffer = new char[BUFFER_SIZE];
                  }
                 Bundle b = new Bundle();
    b.putString("text", text);
    msg.setData(b);
                  in.close();
                  
}catch (IOException e2) {
                e2.printStackTrace();
            }
messageHandler.sendMessage(msg);
}
}.start();    
}

private InputStream openHttpConnection(String urlStr) {
InputStream in = null;
int resCode = -1;

try {
URL url = new URL(urlStr);
URLConnection urlConn = url.openConnection();

if (!(urlConn instanceof HttpURLConnection)) {
throw new IOException ("URL is not an Http URL");
}

HttpURLConnection httpConn = (HttpURLConnection)urlConn;
httpConn.setAllowUserInteraction(false);
            httpConn.setInstanceFollowRedirects(true);
            httpConn.setRequestMethod("GET");
            httpConn.connect(); 

            resCode = httpConn.getResponseCode();                 
            if (resCode == HttpURLConnection.HTTP_OK) {
                in = httpConn.getInputStream();                                 
            }         
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return in;
}

private Handler messageHandler = new Handler() {

public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case 1:
ImageView img = (ImageView) findViewById(R.id.imageview01);
img.setImageBitmap((Bitmap)(msg.getData().getParcelable("bitmap")));
break;
case 2:
TextView text = (TextView) findViewById(R.id.textview01);
text.setText(msg.getData().getString("text"));
break;
}
progressDialog.dismiss();
}
};
}

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