Android Open Source - WebImageView Img Utils

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Back to project page WebImageView.

License

The source code is released under:

MIT License

Java Source Code

package com.rsv.utils;
/*  w  w  w. j  av a2s  .  c om*/
import java.io.InputStream;
import java.lang.reflect.Field;

import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;

public class ImgUtils {
  public static int[] getImageSizeScaleTo(final ImageView imageView) {
    int width = -1;
    int height = -1;

    // Check maxWidth and maxHeight parameters
    try {
      Field maxWidthField = ImageView.class.getDeclaredField("mMaxWidth");
      Field maxHeightField = ImageView.class.getDeclaredField("mMaxHeight");
      maxWidthField.setAccessible(true);
      maxHeightField.setAccessible(true);
      int maxWidth = (Integer) maxWidthField.get(imageView);
      int maxHeight = (Integer) maxHeightField.get(imageView);

      if (maxWidth >= 0 && maxWidth < Integer.MAX_VALUE) {
        width = maxWidth;
      }
      if (maxHeight >= 0 && maxHeight < Integer.MAX_VALUE) {
        height = maxHeight;
      }
    } catch (Exception e) {
      LogUtils.logException(e);
    }

    if (width < 0 && height < 0) {
      // Get layout width and height parameters
      LayoutParams params = imageView.getLayoutParams();
      width = params.width;
      height = params.height;
    }

    if (width < 0 && height < 0) {

    }

    return new int[] { width, height };
  }

  public static int computeImageScale(final InputStream imageStream, int width, int height,
      boolean fastway) {
    Options options = new Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeStream(imageStream, null, options);

    int scale = 1;

    if (fastway) {
      // Find the correct scale value. It should be the power of 2.
      int width_tmp = options.outWidth;
      int height_tmp = options.outHeight;

      while (true) {
        if (width_tmp / 2 < width || height_tmp / 2 < height)
          break;
        width_tmp /= 2;
        height_tmp /= 2;
        scale *= 2;
      }
    } else {
      int widthScale = (int) (Math.floor(((double) options.outWidth) / width));
      int heightScale = (int) (Math.floor(((double) options.outHeight) / height));
      int minScale = Math.min(widthScale, heightScale);
      if (minScale > 1) {
        scale = minScale;
      }
    }

    return scale;
  }
}

Java Source Code List

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