สอบถาม การดึงรูปภาพ android online image loader ภาพไม่ขึ้น

mainActivity.java

package com.present.rmutll;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.Menu;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {
	private Context context;
	private ImageView image;
	private String imageURL;
	
	@SuppressLint("HandlerLeak")
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		//context
		context = this;
		//View Maching
		image=(ImageView) findViewById(R.id.main_imagehistory);
		image=(ImageView) findViewById(R.id.main_imagenews);
		image=(ImageView) findViewById(R.id.main_imagefaculty);
		image=(ImageView) findViewById(R.id.main_imagestudent);
		
		//Define ImageURL
		imageURL = "http://www.newsrealtionsthailand.com/android/btu_history.jpg";
		imageURL = "http://www.newsrealtionsthailand.com/android/btu_news.jpg";
		imageURL = "http://www.newsrealtionsthailand.com/android/btu_faculty.jpg";
		imageURL = "http://www.newsrealtionsthailand.com/android/btu_student.jpg";
		
		//method load
		URL url;
		try {
	   url=new URL(imageURL);
  	image.setImageBitmap(BitmapFactory.decodeStream(url.openStream()));
	} catch (MalformedURLException e){
	e.printStackTrace();
	} catch (IOException e) {
		    e.printStackTrace();
		}
		
		//method 2- use thread handler
		final Handler handler = new Handler() {
			@Override
			public void handleMessage(Message msg) {
				switch (msg.what) {
				case 0:
					Toast.makeText(context,"Failed to load an image", Toast.LENGTH_SHORT).show();
					break;
					
				case 1:
					Toast.makeText(context, "Loaded image.", Toast.LENGTH_SHORT).show();
					image.setImageBitmap((Bitmap)msg.obj);
					break;
				}
				super.handleMessage(msg);
			}
			
		};
		Thread thread = new Thread() {
			@Override
			public void run() {
				URL url;
				Message message = new Message();
				try {
			   url=new URL(imageURL);
			   Bitmap bitmap = BitmapFactory.decodeStream(url.openStream());
		  	   message.what = 1;
		  	   message.obj = bitmap;
			   handler.sendMessage(message);
			} catch (MalformedURLException e){
				e.printStackTrace();
				message.what = 0;
				handler.sendMessage(message);
			} catch (IOException e) {
				message.what = 0;
				handler.sendMessage(message);				
				e.printStackTrace();
				}
			}
		};
		thread.start();
	}

}

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/TableLayout1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/bg"
    tools:context=".MainActivity" >

    <TableLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="0.46" >

        <TableRow
            android:id="@+id/tableRow1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >

            <ImageButton
                android:id="@+id/main_imagehistory"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/btu_history" />

            <ImageButton
                android:id="@+id/main_imagenews"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/btu_news" />

        </TableRow>

        <TableRow
            android:id="@+id/tableRow2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >

            <ImageButton
                android:id="@+id/main_imagefaculty"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/btu_faculty" />

            <ImageButton
                android:id="@+id/main_imagestudent"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/btu_student" />

        </TableRow>

        <TableRow
            android:id="@+id/tableRow3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >
        </TableRow>

        <TableRow
            android:id="@+id/tableRow4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >
        </TableRow>
    </TableLayout>

</TableLayout>