Android Bitmap Decode decodeSampledBitmapFromResource(Resources res, int resId, int reqWidth, int reqHeight)

Description

decode Sampled Bitmap From Resource

Declaration

public static Bitmap decodeSampledBitmapFromResource(Resources res,
            int resId, int reqWidth, int reqHeight) 

Method Source Code

//package com.java2s;

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

public class Main {
    public static Bitmap decodeSampledBitmapFromResource(Resources res,
            int resId, int reqWidth, int reqHeight) {

        // First decode with inJustDecodeBounds=true to check dimensions
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeResource(res, resId, options);

        // Calculate inSampleSize
        options.inSampleSize = calculateInSampleSize(options, reqWidth,
                reqHeight);/*  w  ww. ja v  a 2 s  .  co m*/

        // Decode bitmap with inSampleSize set
        options.inJustDecodeBounds = false;
        return BitmapFactory.decodeResource(res, resId, options);
    }

    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) {

            // Calculate ratios of height and width to requested height and
            // width
            final int heightRatio = Math.round((float) height
                    / (float) reqHeight);
            final int widthRatio = Math.round((float) width
                    / (float) reqWidth);

            // Choose the smallest ratio as inSampleSize value, this will
            // guarantee
            // a final image with both dimensions larger than or equal to the
            // requested height and width.
            inSampleSize = heightRatio < widthRatio ? heightRatio
                    : widthRatio;
        }

        return inSampleSize;
    }
}

Related

1. decodeSampledBitmap(Uri uri, int reqWidth, int reqHeight, Activity act)
2. decodeBitmapFromAssets(Context context, String fileName)
3. decodeImageFile(String strImagePath, BitmapFactory.Options options, boolean checkOrientation)
4. decodeSampledBitmapFromByte(byte[] res, int reqWidth, int reqHeight)
5. decodeSampledBitmapFromFile(String file, int reqWidth, int reqHeight)