scale Image by width and height - Android Graphics

Android examples for Graphics:Bitmap Scale

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Description

scale Image by width and height

Demo Code


//package com.java2s;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.RectF;
import android.util.Log;

public class Main {
    public static void scaleImage(String pathOfInputImage, int dstWidth,
            int dstHeight, String pathOfOutputImage) {
        InputStream in = null;/*from www . ja  v  a  2s .  c o  m*/
        FileOutputStream out = null;
        try {
            int inWidth = 0;
            int inHeight = 0;

            in = new FileInputStream(pathOfInputImage);

            // decode image size (decode metadata only, not the whole image)
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inJustDecodeBounds = true;
            BitmapFactory.decodeStream(in, null, options);
            in.close();
            in = null;

            // save width and height
            inWidth = options.outWidth;
            inHeight = options.outHeight;

            // decode full image pre-resized
            in = new FileInputStream(pathOfInputImage);
            options = new BitmapFactory.Options();
            // calc rought re-size (this is no exact resize)
            options.inSampleSize = Math.max(inWidth / dstWidth, inHeight
                    / dstHeight);
            // decode full image
            Bitmap roughBitmap = BitmapFactory.decodeStream(in, null,
                    options);

            // calc exact destination size
            Matrix m = new Matrix();
            RectF inRect = new RectF(0, 0, roughBitmap.getWidth(),
                    roughBitmap.getHeight());
            RectF outRect = new RectF(0, 0, dstWidth, dstHeight);
            m.setRectToRect(inRect, outRect, Matrix.ScaleToFit.CENTER);
            float[] values = new float[9];
            m.getValues(values);

            // resize bitmap
            Bitmap resizedBitmap = Bitmap.createScaledBitmap(roughBitmap,
                    (int) (roughBitmap.getWidth() * values[0]),
                    (int) (roughBitmap.getHeight() * values[4]), true);

            // save image
            try {
                out = new FileOutputStream(pathOfOutputImage);
                resizedBitmap.compress(Bitmap.CompressFormat.JPEG, 80, out);
            } catch (Exception e) {
                Log.e("Image", e.getMessage(), e);
            }
        } catch (IOException e) {
            Log.e("Image", e.getMessage(), e);
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }
}

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