Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

public class Main {

    public static Bitmap urlToBitmap(String siteUrl, int requireSize) {
        //Log.d(LOG_TAG, "call the urlToBitmap " + ++callTime); // called 8 times..

        if (siteUrl == null) {
            //Log.d(LOG_TAG, "the url is null, throw Exception");
            return null;
        }

        URL url;
        try {
            url = new URL(siteUrl);
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inJustDecodeBounds = true;
            BitmapFactory.decodeStream(url.openStream(), null, options);

            // determinte the scale size
            int scale = 1;
            //Log.d(Constant.LOG_TAG, "the outHeight is " + options.outHeight + ", the outWidth is " + options.outWidth);

            scale = computeSampleSize(options, -1, requireSize * requireSize);
            options.inJustDecodeBounds = false;
            //Log.d(Constant.LOG_TAG, "the scale is " + scale);
            options.inSampleSize = scale;
            Bitmap bitmap = BitmapFactory.decodeStream(url.openStream(), null, options);
            //Log.d(LOG_TAG, "get the bitmap in urltobitmap " + callTime);
            return bitmap;
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //Log.d(LOG_TAG, "return null in urltobitmap " + callTime);
        return null;

    }

    public static int computeSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) {
        int initialSize = computeInitialSampleSize(options, minSideLength, maxNumOfPixels);

        int roundedSize;
        if (initialSize <= 8) {
            roundedSize = 1;
            while (roundedSize < initialSize) {
                roundedSize <<= 1;
            }
        } else {
            roundedSize = (initialSize + 7) / 8 * 8;
        }

        return roundedSize;
    }

    private static int computeInitialSampleSize(BitmapFactory.Options options, int minSideLength,
            int maxNumOfPixels) {
        double w = options.outWidth;
        double h = options.outHeight;

        int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math.sqrt(w * h / maxNumOfPixels));
        int upperBound = (minSideLength == -1) ? 128
                : (int) Math.min(Math.floor(w / minSideLength), Math.floor(h / minSideLength));

        if (upperBound < lowerBound) {
            // return the larger one when there is no overlapping zone.  
            return lowerBound;
        }

        if ((maxNumOfPixels == -1) && (minSideLength == -1)) {
            return 1;
        } else if (minSideLength == -1) {
            return lowerBound;
        } else {
            return upperBound;
        }
    }
}