如何修复我的android照片上传以发送更大的数据流

我有一个android应用程序试图通过API接口将照片上传到web服务器。只要图像大小不太大(在1280x800左右的某个地方失败),该方法就可以很好地工作。在这里,可以工作的代码将缩小图像,但对于较大的图像则会失败。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太大。 10-20 04:16:26.658:错误/dalvikvm(20213):内存不足:堆大小=4551KB,已分配=3039KB,位图大小=9496KB 10-20 04:16:26.658:错误/(20213):虚拟机不允许我们分配8957952字节