Question

我正在尝试将用户选择的图片上传到Parse.com中的阵列上。我无法做到这一点。问题是如何保存以及如何将这些照片取回？这是我上传图片的代码（这是一个例子，所以我使用了drawable的图片：

       Button btnadd = (Button) findViewById(R.id.btnadd);
    btnadd.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Bitmap bitmap;
            bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.one);
            myArrayOfParseFiles.add(add(bitmap));
            bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.two);
            myArrayOfParseFiles.add(add(bitmap));
            bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.three);
            myArrayOfParseFiles.add(add(bitmap));

            ParseObject object = ParseObject.create("Pictures");
            object.add("pic", myArrayOfParseFiles);
            object.put("username", ParseUser.getCurrentUser().getUsername());
            object.saveInBackground();
        }
    });
    Button btnnext = (Button) findViewById(R.id.btnnext);
    btnnext.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intentObj = new Intent(Welcome.this, Show.class);
            startActivity(intentObj);
            finish();
        }
    });
}
    public ParseFile add(Bitmap pic){
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        pic.compress(Bitmap.CompressFormat.PNG, 100, stream);
        byte[] image = stream.toByteArray();
        ParseFile file = new ParseFile(image);
        file.saveInBackground();
    return file;

}

这是获取数组和图片的代码。我得到了空，我无法得到照片。而且，我如何在循环中为解析的整个数组（在特定的原始数据中）执行此操作并将其放在位图列表中。

ParseQuery<ParseObject> query = ParseQuery.getQuery("Pictures");
            query.whereEqualTo("username", ParseUser.getCurrentUser().getUsername());
            query.getFirstInBackground(new GetCallback<ParseObject>() {
                @Override
                public void done(ParseObject object, ParseException e) {
                    List<ParseFile> list = object.getList("pic");
                    try {
                        URL url = new URL(list.get(0).getUrl());
                        Bitmap bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
                        picone.setImageBitmap(bmp);
                    } catch (MalformedURLException e1) {
                        e1.printStackTrace();
                    } catch (IOException e1) {
                        e1.printStackTrace();
                    }
                }
            });

Answer 1

将位图转换为字符串以进行上传：

    private String getStringFromBitmap(Bitmap bitmapPicture) {

        final int COMPRESSION_QUALITY = 100;
        String encodedImage;
        ByteArrayOutputStream byteArrayBitmapStream = new ByteArrayOutputStream();
        bitmapPicture.compress(Bitmap.CompressFormat.PNG, COMPRESSION_QUALITY,
                byteArrayBitmapStream);
        byte[] b = byteArrayBitmapStream.toByteArray();
        encodedImage = Base64.encodeToString(b, Base64.DEFAULT);
        return encodedImage;
    }

并将您的字符串转换为位图：

private Bitmap getBitmapFromString(String jsonString) {
    byte[] decodedString = Base64.decode(jsonString, Base64.DEFAULT);
    Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
    return decodedByte;
}

你可以将你的字符串保存在文件中并将其保存在服务器端或...然后下载字符串并再次将其转换为位图...

Parse.com从阵列中获取图片

1 个答案: