如何重新设置bimpat的大小?

问答小助手 2013-04-26 10:37:30

加精

原问题来自于CSDN问答频道，更多解决方案见：http://ask.csdn.net/questions/2244

问题描述：

在我的程序中我需要重新设置 bitmap的大小，设置成imageview的大小，下面的代码报错了，如何改正，重新设置 bitmap的大小？

Bitmap bmp = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), aMatrix, false);

Bitmap.createScaledBitmap(bmp, MyImageview_wt, MyImageview_ht, false);

MyImageview.setImageBitmap(bmp);

解决方案：
使用下面的代码试试：

public static Bitmap resizeBitMapImage1(String filePath, int targetWidth,

            int targetHeight) {

        Bitmap bitMapImage = null;

        // First, get the dimensions of the image

        Options options = new Options();

        options.inJustDecodeBounds = true;

        BitmapFactory.decodeFile(filePath, options);

        double sampleSize = 0;

        // Only scale if we need to

        // (16384 buffer for img processing)

        Boolean scaleByHeight = Math.abs(options.outHeight - targetHeight) >= Math

                .abs(options.outWidth - targetWidth);

            if (options.outHeight * options.outWidth * 2 >= 1638) {

            // Load, scaling to smallest power of 2 that'll get it <= desired

            // dimensions

            sampleSize = scaleByHeight ? options.outHeight / targetHeight

                    : options.outWidth / targetWidth;

            sampleSize = (int) Math.pow(2d,

                    Math.floor(Math.log(sampleSize) / Math.log(2d)));

        }

        // Do the actual decoding

        options.inJustDecodeBounds = false;

        options.inTempStorage = new byte[128];

        while (true) {

            try {

                options.inSampleSize = (int) sampleSize;

                bitMapImage = BitmapFactory.decodeFile(filePath, options);

                  break;

            } catch (Exception ex) {

                try {

                    sampleSize = sampleSize * 2;

                } catch (Exception ex1) {

                  }

            }

        }

        return bitMapImage;

    }