问题描述

我知道这里和那里都有答案，但我无法让它们中的任何一个起作用.有没有人知道一个很好的参考，或者这个教程，也许也在这里发布?

I know this has answers here and there, but I couldn't make any of them work. Does anybody know a good reference, or a tutorial for this, maybe also post here?

我需要做的是:

1) 提供一个按钮，用于打开相机应用程序.我已经通过 startResultActivity()

1) provide a button, that opens the camera application. I have done this by a startResultActivity()

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

2) user takes the photo, and returns to the application, with the photo saved, preferably with a preview in an ImageView. I tried something, but I cannot test in an emulated device.

3) 按下发送"按钮，应用程序将图片发送到 HTTP POST.有了多部分"，不管是什么.php 开发人员不希望我将图片作为从位图数组转换而来的字符串发送.

3) presses a "send" button, and the application sends the picture to HTTP POST. With "multipart", whatever that is. The php developer does not want me to send the picture as a string converted from a bitmap array.

对此的任何帮助将不胜感激.谢谢！

Any help for this will be appreciated. Thanks !

推荐答案

这个链接对于图片的点击、保存和获取路径应该绰绰有余:捕获图像

This link should be more than sufficient for clicking, saving and getting path of an image: Capture Images

这是我编写的通过 HTTP POST 上传图片的类:

This is the class i wrote for uploading images via HTTP POST:

public class MultipartServer {

private static final String TAG = "MultipartServer";
private static String crlf = "
";
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();
}
}

用法很简单:调用这个静态方法并传递图片的路径，如下:

Usage is quite simple: call this static method and pass the path of your image like:

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

最后:

MultipartServer.postData(url, nameValuePairs);

别忘了在单独的线程中调用这个函数，否则你会得到 NetworkOnMainThreadException.. :)

and don't forget to call this function in a separate thread or you'll get NetworkOnMainThreadException.. :)

我建议不要重新发明轮子使用 OkHttp 代替.请查看 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.

I'd recommend not to reinvent the wheel & use OkHttp instead. Do checkout the Recipes page. Disclaimer: I'm not a contributor to the project, but I love it. Thanks to Square team.

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