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.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

public class Main {
    public static Bitmap bitmapLoad(Resources res, int resId, int width, int height) {

        // calc scale, load appropriately sampled bitmap from given resource

        BitmapFactory.Options resOptions = new BitmapFactory.Options();
        resOptions.inJustDecodeBounds = true;
        BitmapFactory.decodeResource(res, resId, resOptions);

        int resHeight = resOptions.outHeight;
        int resWidth = resOptions.outWidth;

        float xScale = (float) width / (float) resWidth;
        float yScale = (float) height / (float) resHeight;
        float scale = Math.max(xScale, yScale);
        if (scale > 1)

            if (width == 0)
                width = Math.round(resWidth / scale);
            else if (height == 0)
                height = Math.round(resHeight / scale);

        resOptions.inSampleSize = sampleSize(scale);
        resWidth /= resOptions.inSampleSize;
        resHeight /= resOptions.inSampleSize;
        resOptions.inJustDecodeBounds = false;

        Bitmap rawBitmap = BitmapFactory.decodeResource(res, resId, resOptions);

        // compare aspect ratio and crop

        rawBitmap = bitmapCrop(rawBitmap, width, height, resWidth, resHeight);

        // scale to desired size

        return Bitmap.createScaledBitmap(rawBitmap, width, height, true);
    }

    private static int sampleSize(float scale) {

        int size = 1;

        while (scale < 0.5f) {

            size *= 2;
            scale *= 2;
        }

        return size;
    }

    private static Bitmap bitmapCrop(Bitmap rawBitmap, int width, int height, int resWidth, int resHeight) {

        int cropX, cropY, cropWidth, cropHeight;

        float xScale = (float) width / (float) resWidth;
        float yScale = (float) height / (float) resHeight;
        float scale = Math.max(xScale, yScale);

        if (xScale >= yScale) {
            cropWidth = Math.round(resWidth);
            cropX = 0;
            cropHeight = Math.round(height / scale);
            cropY = (resHeight - cropHeight) / 2;
        } else {
            cropWidth = Math.round(width / scale);
            cropX = (resWidth - cropWidth) / 2;
            cropHeight = Math.round(resHeight);
            cropY = 0;
        }

        return Bitmap.createBitmap(rawBitmap, cropX, cropY, cropWidth, cropHeight);
    }
}