Bitmap image Zoom by size - Android Graphics

Android examples for Graphics:Bitmap Zoom

  1. HOME
  2. Android
  3. Graphics
  4. Bitmap Zoom

Description

Bitmap image Zoom by size

Demo Code


//package com.java2s;
import android.graphics.Bitmap;

import android.graphics.Matrix;
import java.io.ByteArrayOutputStream;

public class Main {
    public static Bitmap imageZoom(Bitmap bitmap, double maxSize) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 70, baos);
        byte[] b = baos.toByteArray();
        double mid = (double) (b.length / 1024);
        double i = mid / maxSize;
        if (i > 1.0D) {
            bitmap = scaleWithWH(bitmap,
                    (double) bitmap.getWidth() / Math.sqrt(i),
                    (double) bitmap.getHeight() / Math.sqrt(i));
        }//  ww w. ja  v  a  2  s .  c o m

        return bitmap;
    }

    public static Bitmap scaleWithWH(Bitmap src, double w, double h) {
        if (w != 0.0D && h != 0.0D && src != null) {
            int width = src.getWidth();
            int height = src.getHeight();
            Matrix matrix = new Matrix();
            float scaleWidth = (float) (w / (double) width);
            float scaleHeight = (float) (h / (double) height);
            matrix.postScale(scaleWidth, scaleHeight);
            return Bitmap.createBitmap(src, 0, 0, width, height, matrix,
                    true);
        } else {
            return src;
        }
    }
}

Related Tutorials