代号一:将图像保存到存储并创建小的四舍五入预览 [英] Codename One: Save Image to Storage and create small rounded preview

问题描述

我现在必须对图像有疑问:

I have to problem with Images currently:

1)我无法将图像保存到存储中，因为不支持将图像直接存储到存储中.我希望用户能够使用相机拍摄照片，然后将创建的照片保存在某个地方，以便稍后再次检索.

1) I can't save an Image to Storage because it is not supported to store it directly to the storage. I want users to be able to take a photo with the camera and then the created Photo has to be saved somewhere, so I can retrieve it later on again.

你能告诉我如何a)保存图像b)如何找回

Could you tell me how a) To save an Image b) How to retrieve it

我在Stackoverflow中找到了Shai制作的这段代码，另一个用户询问如何将图像保存到存储中.

I found this Code piece made by Shai in Stackoverflow where another user asked how to save Images to Storage also.

InputStream stream = FileSystemStorage.getInstance().openInputStream(i);
OutputStream out = Storage.getInstance().createOutputStream("MyImage");
Util.copy(stream, out);
Util.cleanup(stream);
Util.cleanup(out);

但是我不明白.如何从中获得图像"对象?以及"Image"对象到底存储在哪里呢?你能在这里给我一个完整的例子吗?这对于我的应用程序确实至关重要.

But I don't understand it. How can I get an "Image" Object out of this? And how exactly is the "Image" Object stored there? Could you give me a full example here? This is really essential for my app.

2)

这个问题可能很简单，但是我找不到答案.我想重新缩放所拍摄的相机图片，并在其周围制作一个圆形的蒙版.我试过了:

This question might be trivial, but I couldn't find an answer to it though. I want to rescale the taken camera picture and make a rounded mask around it. I tried this:

        Image capturedImage = Image.createImage(Capture.capturePhoto());
        int width = capturedImage.getWidth();
        int hight = capturedImage.getHeight();
        Image rounded = Image.createImage(width, capturedImage.getHeight(), 0xff000000);
        Graphics gr = rounded.getGraphics();
        gr.setColor(0xffffff);
        gr.fillArc(0, 0, width, hight, 0, 360);
        Object mask = rounded.createMask();
        Image ImagePreview = capturedImage.applyMask(mask);

但是它没有成功，ImagePreview甚至都不会显示.无论如何，此预览都是原始大小的，之后我如何将其调整为较小的预览大小?

But it did not work out, the ImagePreview wont even show up. This preview would be original-sized anyway, how would I resize it to a small preview for the user afterwards?

谢谢.

我尝试了以下方法来保存图像:

I have tried the following to save the image:

            Image capturedImage = Image.createImage(Capture.capturePhoto());
String imageFile = FileSystemStorage.getInstance().getAppHomePath() + "test.png";
            try(OutputStream os = FileSystemStorage.getInstance().openOutputStream(imageFile)) {
                ImageIO.getImageIO().save(capturedImage, os, ImageIO.FORMAT_PNG, 1);
            } catch(IOException err) {
                Log.e(err);
            }
            songList.setImage(imageFile); 

并在以后尝试检索它:

if(songList.getImage() != null){
        try {
            Image img = Image.createImage(Storage.getInstance().createInputStream(songList.getImage()));
            Label test = new Label();
            test.setIcon(img);
            listCont.add(test);
        } catch(Exception ex){
            Dialog.show("Error", "Error during image loading: " + ex, "OK", null);
        }
    }

但是我收到一个错误，他找不到该文件.(设备模拟器).我在做错什么吗?

But I am getting an error that he can't find the file. (Device Simulator). Am I doing something wrong?

推荐答案

这是为遇到麻烦的任何人存储和加载图像的完整工作示例:

Here is a complete working example of storing and loading an image for anyone who also had trouble:

保存图像:

        String filePath = Capture.capturePhoto();
        if (filePath != null) {
            try {
                String pathToBeStored = FileSystemStorage.getInstance().getAppHomePath() + System.currentTimeMillis() +  ".jpg");
                Image img = Image.createImage(filePath);
                OutputStream os = FileSystemStorage.getInstance().openOutputStream(pathToBeStored );
                ImageIO.getImageIO().save(img, os, ImageIO.FORMAT_JPEG, 0.9f);
                os.close();
            }
            catch (Exception e) {
                e.printStackTrace();
            }
        }

加载图像:

        if(pathToImage != null){
            try {
                Image img = Image.createImage(FileSystemStorage.getInstance().openInputStream(pathToImage));
            } catch(Exception ex){
                Dialog.show("Error", "Error during image loading: " + ex, "OK", null);
            }
        }

这篇关于代号一:将图像保存到存储并创建小的四舍五入预览的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！