Question

我是android的新手。图片以 Base64 格式存储在服务器中。那么如何才能从服务器到我的项目，并使用Json Object设置为我的ImageView。请帮帮我

任何帮助都将获得Appappreciated

Answer 1

试试这个：

首先将Url转换为byte []：

byte[] bitmapdata = getByteArrayImage(url);

方法：

private byte[] getByteArrayImage(String url){
         try {
                 URL imageUrl = new URL(url);
                 URLConnection ucon = imageUrl.openConnection();

                 InputStream is = ucon.getInputStream();
                 BufferedInputStream bis = new BufferedInputStream(is);

                 ByteArrayBuffer baf = new ByteArrayBuffer(500);
                 int current = 0;
                 while ((current = bis.read()) != -1) {
                         baf.append((byte) current);
                 }

                 return baf.toByteArray();
         } catch (Exception e) {
                 Log.d("ImageManager", "Error: " + e.toString());
         }
         return null;
    }

现在将byte []转换为位图

Bitmap bitmap = BitmapFactory.decodeByteArray(bitmapdata , 0, bitmapdata .length);

并将您的位图设置为ImageView：

img= (ImageView) findViewById(R.id.imgView);
img.setImageBitmap(bitmap );

Answer 2

试试这个：

URL u = new URL(content);
openStream = u.openStream();
int contentLength = openStream.available();
byte[] binaryData = new byte[contentLength];
openStream.read(binaryData);
openStream.close();

Answer 3

我找到了简单的解决方案：

byte[] img = Base64.decode(userHeader.GetImage(), Base64.DEFAULT);
                Bitmap bitmap = BitmapFactory.decodeByteArray(img, 0, img.length);
                imageww.setImageBitmap(getCircleBitmap(bitmap));

Answer 4

使用Apache的commons-io-2.5 lib我们可以使用这个函数IOUtils.toByteArray（是）

public static String getByteArrayFromURL(final  String url) {
        String base64Image = "";
        ExecutorService executor = Executors.newSingleThreadExecutor();
        Future<String> result = executor.submit(new Callable<String>() {
            public String call() throws Exception {
                try {

                    URL imageUrl = new URL(url);
                    URLConnection ucon = imageUrl.openConnection();
                    InputStream is = ucon.getInputStream();
                    return Base64.encodeToString(IOUtils.toByteArray(is), Base64.NO_WRAP);
                } catch (Exception e) {

                    e.printStackTrace();
                }
                return null;
            }
        });

        try {
            base64Image = result.get();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
        return base64Image;
    }

如何从Android中的url获取字节图像

4 个答案: