AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="org.buffr.Sketch20091125_01"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-permission android:name="android.permission.INTERNET" />
    <application android:label="@string/app_name">
        <activity android:name=".Sketch20091125_01"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest> 

gistfile4.txt

url指定した画像をダウンロードして表示

memo
- ネット接続するためにmanifestファイルいじった
  <uses-permission android:name="android.permission.INTERNET" />
- InputStream一度で最後まで読んでくれないのでEOF(-1)返ってくるまで繰り返す

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"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="20px" 
    android:text="Hello World, Sketch20091125_01"
    />
<ImageView
   android:id="@+id/imageview"
   android:layout_width="fill_parent" 
   android:layout_height="wrap_content" 
   />
</LinearLayout>

Sketch20091125_01.java

package org.buffr.Sketch20091125_01;

import android.app.Activity;
import android.os.Bundle;

import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.widget.ImageView;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import java.io.InputStream;
import android.util.Log;

public class Sketch20091125_01 extends Activity
{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ImageView iv = (ImageView)findViewById(R.id.imageview);
//        drawSquare(iv, 0x00b4f5);
        drawJPEG(iv, "http://www.google.co.jp/intl/en_com/images/logo_plain.png");
    }

    public void drawSquare(ImageView iv, int color) {
        int width = 100;
        int height = 100;
        int[] colors = new int[width * height];
        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                colors[y * width + x] = 0xFF000000 | color;
            }
        }
        Bitmap bmp = Bitmap.createBitmap(colors,width,height, Bitmap.Config.ARGB_8888);
        iv.setImageBitmap(bmp);
    }

    public void drawJPEG(ImageView iv, String url) {
        HttpResponse res = download(url);
        Bitmap bmp = getBitmapFromHttpResponse(res);
        iv.setImageBitmap(bmp);
    }

    public Bitmap getBitmapFromHttpResponse(HttpResponse res) {
        StatusLine status = res.getStatusLine();
        HttpEntity entity = res.getEntity();
        int length = (int)entity.getContentLength();
        InputStream dataStream = null;
        try {
            dataStream = entity.getContent();
        } catch (java.io.IOException e) {
            Log.d("drawJPEG", "IOException get content" + e);
            finish();
        }
        byte[] data = new byte[length];
        try {
            Log.d("drawJPEG", "before read");
            int read_byte = 0;
            int read_offset = 0;
            int read_length = length;
            while (read_byte != -1) {
                read_byte = dataStream.read(data, read_offset, read_length);
                read_offset += read_byte;
                read_length -= read_byte;
                Log.d("drawJPEG", "after read.... " + read_byte);
            }
            Log.d("drawJPEG", "after read " + read_byte);
        } catch (java.io.IOException e) {
            Log.d("drawJPEG", "IOException read" + e);
            finish();
        }
        Log.d("drawJPEG", "before decodeByteArray");
        Bitmap bmp = BitmapFactory.decodeByteArray(data, 0, length);
        Log.d("drawJPEG", "after decodeByteArray " + ((bmp != null) ? "OK" : "NG"));
        return bmp;
    }

    public HttpResponse download(String url) {
        HttpGet req = new HttpGet(url);
        req.addHeader("User-Agent", "Firefox3.5");
        try {
            DefaultHttpClient client = new DefaultHttpClient();
            HttpResponse res = client.execute(req);
            return res;
        }
        catch(Exception e) {
            Log.d("drawJPEG", "Exception download" + e);
            finish();
            return null;
        }
    }

}