Android 调整位图大小，保持纵横比，无失真和裁剪

有没有办法在不失真的情况下调整位图的大小，使其不超过720*1280？高度和宽度越小越好（宽度或高度越小，空白画布就越好），我试过了，但它会使图像失真。有人能提出更好的解决方案吗

以下是将位图缩小到不超过最大允许分辨率的方法。在您的情况下，

允许的最大分辨率=1280

。它将在不失真和质量损失的情况下缩小尺寸：

private static Bitmap downscaleToMaxAllowedDimension(String photoPath) {
    BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
    bitmapOptions.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(photoPath, bitmapOptions);

    int srcWidth = bitmapOptions.outWidth;
    int srcHeight = bitmapOptions.outHeight;

    int dstWidth = srcWidth;

    float scale = (float) srcWidth / srcHeight;

    if (srcWidth > srcHeight && srcWidth > MAX_ALLOWED_RESOLUTION) {
        dstWidth = MAX_ALLOWED_RESOLUTION;
    } else if (srcHeight > srcWidth && srcHeight > MAX_ALLOWED_RESOLUTION) {
        dstWidth = (int) (MAX_ALLOWED_RESOLUTION * scale);
    }

    bitmapOptions.inJustDecodeBounds = false;
    bitmapOptions.inDensity = bitmapOptions.outWidth;
    bitmapOptions.inTargetDensity = dstWidth;

    return BitmapFactory.decodeFile(photoPath, bitmapOptions);
}

如果您已经有位图对象而不是路径，请使用以下选项：

 private static Bitmap downscaleToMaxAllowedDimension(Bitmap bitmap) {
        int MAX_ALLOWED_RESOLUTION = 1024;
        int outWidth;
        int outHeight;
        int inWidth = bitmap.getWidth();
        int inHeight = bitmap.getHeight();
        if(inWidth > inHeight){
            outWidth = MAX_ALLOWED_RESOLUTION;
            outHeight = (inHeight * MAX_ALLOWED_RESOLUTION) / inWidth;
        } else {
            outHeight = MAX_ALLOWED_RESOLUTION;
            outWidth = (inWidth * MAX_ALLOWED_RESOLUTION) / inHeight;
        }

        Bitmap resizedBitmap = Bitmap.createScaledBitmap(bitmap, outWidth, outHeight, false);

        return resizedBitmap;
    }

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@pskink大小调整Bitmap@pskink给扭曲的图像。。。我想在不失真的情况下缩放位图（保持纵横比或均匀缩放），并将其设置为720大小的画布*1280@pskink您能否回答如何统一缩放任意大小的位图，以便id不超过指定的高度和宽度？