BitmapUtils.java 文件源码

public static Bitmap getSampledBitmap(String filePath, int reqWidth, int reqHeight)
{
    Options options = new Options();
    options.inJustDecodeBounds = true;

    BitmapFactory.decodeFile(filePath, options);

    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth)
    {
        if (width > height)
        {
            inSampleSize = (int)FloatMath.floor(((float)height / reqHeight)+0.5f); //Math.round((float)height / (float)reqHeight);
        }
        else
        {
            inSampleSize = (int)FloatMath.floor(((float)width / reqWidth)+0.5f); //Math.round((float)width / (float)reqWidth);
        }
    }

    options.inSampleSize = inSampleSize;
    options.inJustDecodeBounds = false;

    return BitmapFactory.decodeFile(filePath, options);
}