decode Sampled Bitmap From File - Android android.graphics

Android examples for android.graphics:Bitmap Load Save

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Description

decode Sampled Bitmap From File

Demo Code

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

public class Main {

  public static Bitmap decodeSampledBitmapFromFile(String pathFile, int reqWidth, int reqHeight) {

    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;/*w ww  .  j  a va 2 s . c o  m*/
    BitmapFactory.decodeFile(pathFile, options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeFile(pathFile, 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) {

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

      // Calculate the largest inSampleSize value that is a power of 2 and
      // keeps both
      // height and width larger than the requested height and width.
      while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) {
        inSampleSize *= 2;
      }
    }

    return inSampleSize;
  }

}

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