Utils.java

package com.bourke.finch.lazylist;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.OutputStream;

public class Utils {

    public static void CopyStream(InputStream is, OutputStream os) {
        final int buffer_size=1024;
        try {
            byte[] bytes=new byte[buffer_size];
            for(;;) {
                int count=is.read(bytes, 0, buffer_size);
                if(count==-1)
                    break;
                os.write(bytes, 0, count);
            }
        }
        catch(Exception ex) {
            ex.printStackTrace();
        }
    }

    /* Decodes image and scales it to reduce memory consumption */
    public static Bitmap decodeFile(File f) {
        try {
            // recode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            BitmapFactory.decodeStream(new FileInputStream(f),null,o);

            // Find the correct scale value. It should be the power of 2.
            final int REQUIRED_SIZE = 100;
            int width_tmp=o.outWidth, height_tmp=o.outHeight;
            int scale=1;
            while(true){
                if(width_tmp/2<REQUIRED_SIZE || height_tmp/2<REQUIRED_SIZE)
                    break;
                width_tmp/=2;
                height_tmp/=2;
                scale*=2;
            }

            // Decode with inSampleSize
            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize=scale;
            return BitmapFactory.decodeStream(new FileInputStream(f), null,
                    o2);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }
}