Question

在我的应用程序中，我需要将位图的大小调整为imageview大小。我尝试了以下代码，但我得到了例外。

Bitmap bmp = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), aMatrix, false);
Bitmap.createScaledBitmap(bmp, MyImageview_wt, MyImageview_ht, false);
MyImageview.setImageBitmap(bmp);

请帮忙

由于 Monali

Answer 1

尝试使用以下代码

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;
    }

Answer 2

我认为您正在尝试获取Bitmap本身的宽度和高度，但您希望获得ImageView的高度和宽度，并相应地调整Bitmap的大小。

Answer 3

试试这个：

Bitmap bmp = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), aMatrix, false);
bmp = Bitmap.createScaledBitmap(bmp, MyImageview_wt, MyImageview_ht, false);
MyImageview.setImageBitmap(bmp);

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