如何拍照并发送到Android的HTTP POST请求？

Question

我知道这里有答案,但我不能让它们中的任何一个起作用.有人知道一个很好的参考,或者这方面的教程,也许也发布在这里？

我需要做的是:

1)提供一个按钮,打开相机应用程序.我这样做了startResultActivity()

2)用户拍摄照片,并返回应用程序,保存照片,最好在ImageView中预览.我尝试了一些东西,但我无法在模拟设备中进行测试.

3)按下"发送"按钮,应用程序将图片发送到HTTP POST.随着"多部分",无论是什么.php开发人员不希望我将图片作为从位图数组转换的字符串发送.

任何帮助将不胜感激.谢谢 !

Answer 1

此链接应足以单击,保存和获取图像路径: 捕获图像

这是我写的用于通过HTTP POST上传图像的类:

public class MultipartServer {

private static final String TAG = "MultipartServer";
private static String crlf = "\r\n";
private static String twoHyphens = "--";
private static String boundary =  "*****";
private static String avatarPath = null;

public static String postData(URL url, List<NameValuePair> nameValuePairs) throws IOException {

    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setReadTimeout(10000);
    connection.setConnectTimeout(15000);
    connection.setRequestMethod("POST");
    connection.setUseCaches(false);
    connection.setDoInput(true);
    connection.setDoOutput(true);

    connection.setRequestProperty("Connection", "Keep-Alive");
    connection.setRequestProperty("Cache-Control", "no-cache");
    connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);

    String avatarName = null;
    StringBuilder query = new StringBuilder();
    boolean first = true;
    for (NameValuePair pair : nameValuePairs) {
        if (first)
            first = false;
        else
            query.append("&");
        query.append(URLEncoder.encode(pair.getName(), "UTF-8"));
        query.append("=");
        query.append(URLEncoder.encode(pair.getValue(), "UTF-8"));
        if ((avatarName = pair.getName()).equals("avatar")) {
            avatarPath = pair.getValue();
        }

    }

    FileInputStream inputStream;
    OutputStream outputStream = connection.getOutputStream();
    DataOutputStream dataOutputStream = new DataOutputStream(outputStream);

    dataOutputStream.writeBytes(query.toString());

    // Write Avatar (if any)
    if(avatarName != null && avatarPath != null) {
        dataOutputStream.writeBytes(twoHyphens + boundary + crlf);
        dataOutputStream.writeBytes("Content-Disposition: form-data; name=\"" + avatarName + "\";filename=\"" + new File(avatarPath).getName() + "\";" + crlf);
        dataOutputStream.writeBytes(crlf);

        /*Bitmap avatar = BitmapFactory.decodeFile(avatarPath);
        avatar.compress(CompressFormat.JPEG, 75, outputStream);
        outputStream.flush();*/

        inputStream = new FileInputStream(avatarPath);
        byte[] data = new byte[1024];
        int read;
        while((read = inputStream.read(data)) != -1)
            dataOutputStream.write(data, 0, read);
        inputStream.close();

        dataOutputStream.writeBytes(crlf);
        dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens + crlf);
    }

    dataOutputStream.flush();
    dataOutputStream.close();

    String responseMessage = connection.getResponseMessage();
    Log.d(TAG, responseMessage);

    InputStream in = connection.getInputStream();
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in, "UTF-8"));

    StringBuilder response = new StringBuilder();
    char []b = new char[512];
    int read;
    while((read = bufferedReader.read(b))!=-1) {
        response.append(b, 0, read);
    }

    connection.disconnect();
    Log.d(TAG, response.toString());
    return response.toString();
}
}

用法非常简单:调用此静态方法并传递图像的路径,如:

List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("avatar", imagePath));

最后:

MultipartServer.postData(url, nameValuePairs);

并且不要忘记在单独的线程中调用此函数,否则您将获得NetworkOnMainThreadException .. :)

更新

我建议不要重新发明轮子并使用OkHttp.检查食谱页面.免责声明:我不是该项目的贡献者,但我喜欢它.感谢Square团队.