Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

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

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;

public class Main {
    /** Gets Bitmap from inputStream downsampled.
     *
     * @param bis
     * @param reqWidth
     * @param reqHeight
     * @return
     */
    public static Bitmap decodeSampledBitmapFromStream(InputStream bis, int reqWidth, int reqHeight) {

        InputStream is = new BufferedInputStream(bis);

        try {
            is.mark(is.available());
        } catch (IOException e) {
            e.printStackTrace();
        }

        // First decode with inJustDecodeBounds=true to check dimensions
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        Bitmap bmp0 = BitmapFactory.decodeStream(is, null, options);

        try {
            is.reset();
        } catch (IOException e) {
            e.printStackTrace();
        }

        // Calculate inSampleSize
        //options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
        // Decode bitmap with inSampleSize set
        options.inJustDecodeBounds = false;
        Bitmap bmp = BitmapFactory.decodeStream(is, null, options);
        return bmp;
    }

    /**
     * Calculates sample size
     *
     * @param options
     * @param reqWidth
     * @param reqHeight
     * @return
     */
    public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
        // Raw height and width of image
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {

            final int halfHeight = height / 2;
            final int halfWidth = width / 2;

            // Calculate the largest inSampleSize value that is a power of 2 and keeps both
            // height and width larger than the requested height and width.
            while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) {
                inSampleSize *= 2;
            }
        }

        return inSampleSize;
    }
}