Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2017 Florian Dreier
 *
 * This file is part of MyTargets.
 *
 * MyTargets is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * MyTargets is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

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

import java.io.File;
import java.io.FileInputStream;

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

public class Main {
    public static Bitmap decodeSampledBitmapFromFile(File file, int reqWidth, int reqHeight) throws IOException {
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        InputStream stream = new FileInputStream(file);
        BitmapFactory.decodeStream(stream, null, options);
        stream.close();
        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
        options.inJustDecodeBounds = false;
        stream = new FileInputStream(file);
        Bitmap bmp = BitmapFactory.decodeStream(stream, null, options);
        stream.close();
        return bmp;
    }

    private 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;
        int minSize = Math.max(reqWidth, reqHeight);

        if (height > minSize || width > minSize) {

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

            while ((halfHeight / inSampleSize) > minSize && (halfWidth / inSampleSize) > minSize) {
                inSampleSize *= 2;
            }
        }

        return inSampleSize;
    }
}