Android的/爪哇 - 如何从Web服务中检索图像并显示它 [英] Android/Java - How to retrieve image from web service and show it

问题描述

我使用一个Web服务通常返回JSON阶跃响应，而是一个服务的一些服务，当我发送用户的ID返回一个静态的GIF图像（非动态）。

I'm using some services of a web service which usually returns JSON respones, but one service when I send the ID of a user returns a static GIF image (Not animated).

这是我做的程序是：

使用1.连接到Web服务DefaultHttpClient结果
2.Convert InputStream的接收到字符串与此utilitary方法：

1.Connect to web service using DefaultHttpClient
2.Convert the InputStream received to a String with this utilitary method:

public static String inputStreamToStringScanner(InputStream in) {

  Scanner fileScanner = new Scanner(in);
  StringBuilder inputStreamString = new StringBuilder();
  while(fileScanner.hasNextLine())
    inputStreamString.append(fileScanner.nextLine()).append("\n");
  fileScanner.close();

  return inputStreamString.toString();
}

3.Storage转换后收到的字串来处理服务器响应。

3.Storage the converted received String to process the server response.

有关影像服务，当我看到转换的字符串，它是这样开始的：
的GIF89a ?? ......

For the Image Service, when I see the string converted, it begins like this: "GIF89a?��?�� ..."

这是一个静态的GIF文件。

It's a static GIF file.

我不能够显示在ImageView的形象，我已经试过，我在网上找到不同的东西：

I'm not being able to show the image in a ImageView, I have tried different things that I found in the web:

public void onPhotoFinished (String responseData) {

  InputStream is = new ByteArrayInputStream(responseData.getBytes());
  Bitmap bm = BitmapFactory.decodeStream(is);
  userImage.setImageBitmap(bm);
}

这是别的东西，我自己也尝试：

This is something else that I have also tried:

public void onPhotoFinished (String responseData) {

  InputStream is = new ByteArrayInputStream(responseData.getBytes());
  final Bitmap bm = BitmapFactory.decodeStream(new BufferedInputStream(is));
  userImage.setImageBitmap(bm);
}

这也没有工作：

public void onPhotoFinished (String responseData) {

  InputStream is = new ByteArrayInputStream(responseData.getBytes());
  Drawable d = Drawable.createFromStream(is, "src name");
  userImage.setImageDrawable(d);
}

最后，这并不工作之一：

Finally, this doesn't work either:

public void onPhotoFinished (String responseData) {

  Bitmap bm = BitmapFactory.decodeByteArray(responseData.getBytes(), 0, responseData.getBytes().length);
  userImage.setImageBitmap(bm);
}

在LogCat中我收到去codeR->德code返回false

In Logcat I receive "decoder->decode returned false"

似乎没有任何工作...的什么是错的任何想法？

Nothing seems to work... any ideas of what is wrong?

谢谢！

推荐答案

最后，我FlushedInputStream并使用直接输入流解决它，避免了转换为字符串：

Finally, I resolved it with FlushedInputStream and using directly the Input Stream, avoiding the conversion to String:

static class FlushedInputStream extends FilterInputStream { 

public FlushedInputStream(InputStream inputStream) {
    super(inputStream);
}

@Override
public long skip(long n) throws IOException { 

  long totalBytesSkipped = 0L;
  while (totalBytesSkipped < n) { 
    long bytesSkipped = in.skip(n - totalBytesSkipped);
    if (bytesSkipped == 0L) { 
      int byteReaded = read();
      if (byteReaded < 0) {
          break; 
      } else {
          bytesSkipped = 1;
      }
    }
    totalBytesSkipped += bytesSkipped;
  }
  return totalBytesSkipped;
}

}

和

Bitmap bitmapResponseData = BitmapFactory.decodeStream(new FlushedInputStream(is));

问候

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