如何修复 Android 照片上传以发送更大的数据流

Question

我有一个 Android 应用程序正在尝试通过 API 接口将照片上传到网络服务器。只要图像尺寸不太大（在 1280x800 左右失败），该方法就可以正常工作。下面的代码适用于较小的图像，但适用于较大的图像。有什么建议吗？

public void uploadPhoto(FileInputStream fileInputStream, String session_key) throws IOException, ClientProtocolException {

    URL connectURL = new URL(API_ENDPOINT_URL + "session_key="
            + session_key + "&method=" + ApiMethods.UPLOAD_PHOTO);
    String lineEnd = "\r\n";
    String twoHyphens = "--";
    String boundary = "*****";

    HttpURLConnection conn = (HttpURLConnection) connectURL.openConnection();

    // Allow Inputs
    conn.setDoInput(true);

    // Allow Outputs
    conn.setDoOutput(true);

    // Don't use a cached copy.
    conn.setUseCaches(false);

    // Use a post method.
    conn.setRequestMethod("POST");

    conn.setRequestProperty("Connection", "Keep-Alive");

    conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+ boundary);

    DataOutputStream dos = new DataOutputStream(conn.getOutputStream());

    dos.writeBytes(twoHyphens + boundary + lineEnd);
    // Log.d(TAG, "  dos1: " + dos);
    dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\""+ "file.png" + "\"" + lineEnd);
    // Log.d(TAG, "  dos2: " + dos);
    dos.writeBytes(lineEnd);
    // Log.d(TAG, "  dos3: " + dos);

    // create a buffer of maximum size

    int bytesAvailable = fileInputStream.available();
    int maxBufferSize = 1024;
    int bufferSize = Math.min(bytesAvailable, maxBufferSize);
    byte[] buffer = new byte[bufferSize];

    // read file and write it into form...

    int bytesRead = fileInputStream.read(buffer, 0, bufferSize);
    Log.d(TAG, " BytesREad:" + bytesRead);
    while (bytesRead > 0) {
        Log.d(TAG, " BytesREad in while:" + bytesRead);
        dos.write(buffer, 0, bufferSize);
        // Log.d(TAG, "  dos3: " + dos);
        bytesAvailable = fileInputStream.available();
        bufferSize = Math.min(bytesAvailable, maxBufferSize);
        bytesRead = fileInputStream.read(buffer, 0, bufferSize);
        /*
         * dos.writeBytes(lineEnd); dos.writeBytes(twoHyphens + boundary +
         * twoHyphens + lineEnd);
         */
    }

    // send multipart form data necesssary after file data...

    // dos.write(data);
    dos.writeBytes(lineEnd);
    dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
    // Log.d(TAG, "  dos4 tostring: " + dos.toString());

    // close streams
    // Log.e(Tag,"File is written");
    // fileInputStream.close();
    dos.flush();
    // Log.d(TAG, "  dos5: " + dos.toString());
    InputStream is = conn.getInputStream();
    // retrieve the response from server
    int ch;

    StringBuffer b = new StringBuffer();
    while ((ch = is.read()) != -1) {
        b.append((char) ch);
        // Log.d(TAG, "  b: " + b.toString());
    }
    String s = b.toString();
    Log.i("Response", s);
    // Log.d(TAG, "   response:" + s);
    dos.close();

}

错误包括

10-20 04:16:26.658: ERROR/dalvikvm-heap(20213): 8957952 字节外部分配对于此进程来说太大。 10-20 04：16：26.658：错误/dalvikvm（20213）：内存不足：堆大小= 4551 KB，已分配= 3039 KB，位图大小= 9496 KB 10-20 04:16:26.658: 错误/(20213): VM 不允许我们分配 8957952 字节

Answer 1

我以前遇到过非常类似的问题，结果不是上传图片，而是因为我试图在活动中显示它。

Answer 2

在开发 PhoneKlone 时，我发现上传大照片会在 Android 上导致错误，原因仅仅是因为虚拟机错误限制。

解决方法：使用压缩来减小文件大小或尝试“阻止”图像（分多个步骤上传视频的裁剪部分）