如何重新设置bimpat的大小?

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);

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;
    }

public static Bitmap createBitmap (Bitmap source, int x, int y, int width, int height, Matrix m, boolean filter) 

第一个参数是个资源图片，直接用bmp哪有图片
这是高级方式裁剪图片

http://blog.csdn.net/tf576776047/article/details/8143456 看一下