Android URLConnection, Image download example

안드로이드에서 URLConnection을 이용하여 웹사이트의 이미지를 다운로드하고 보여주는 예

res/layout/main.xml

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

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher" />

</LinearLayout>

AndroidManifest.xml 에는 다음과 같이 권한을 설정하는 부분이 있어야 한다

<uses-permission android:name="android.permission.INTERNET"/>

MainActivity.java

package com.example.androidapp;
import java.io.*;
import java.net.*;

import android.app.*;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.*;
import android.util.*;
import android.widget.*;

public class MainActivity extends Activity {
	
	ImageView iv;
	Handler handler = new Handler();
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        iv = (ImageView) findViewById(R.id.imageView1);
        new Thread() {
        	public void run() {
        		connect();
        	}
        }.start();
    }
    
    Bitmap bitmap;
    private void connect() {
    	try{
    		URL url = new URL("http://t1.gstatic.com/images?q=tbn:ANd9GcS6RG0nsiyrUwKy3aB_cxASREkk7tO3fEbxE7w2YHxYzeZTTUBn");
    		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    		if(conn!=null) {
    			conn.setConnectTimeout(10000);
    			conn.setRequestMethod("GET");
    			conn.setDoInput(true);
    			conn.setDoOutput(true);
    			int resCode = conn.getResponseCode();
    			if(resCode == HttpURLConnection.HTTP_OK) {
    				InputStream is = conn.getInputStream();
    				bitmap = BitmapFactory.decodeStream(is);
    				is.close();
    				conn.disconnect();
    			}
    		}
    		handler.post(new Runnable() {
    			public void run() {
    				iv.setImageBitmap(bitmap);
    			}
    		});
    	}catch(Exception ex) {
    		ex.printStackTrace();
    		Log.e("접속오류", ex.toString());
    	}
    }
}