Android Retrofit - 用于显示进度通知的 onProgressUpdate [英] Android Retrofit - onProgressUpdate for showing Progress Notification

问题描述

我目前正在使用 Square 的 Retrofit 进行 Android 网络通信.有没有办法在任务期间获取进度以创建进度通知，类似于 Facebook 在上传图片时使用的通知?

I'm currently using Retrofit by Square for Android network communications. Is there a way to get its progress during a task to create a progress notification, something similar to that which Facebook uses when uploading an image?

用例是在不压缩或缩放的情况下加载希望具有完整图像质量的图像.

Use Case would be to load an image hopefully of full image quality without compression or scaling.

我看到异步任务是如何实现的，但这会破坏使用 Retrofit 的目的.然而，这可能是我必须走的路线.

I see how it is possible with an asynctask but that would defeat the purpose of using Retrofit. However that might be the route I would have to take.

推荐答案

此答案适用于 Retrofit 1.对于与 Retrofit 2 兼容的解决方案 看这个答案.

我遇到了同样的问题，最后设法做到了.我之前使用过 spring lib，我在下面展示的内容适用于 Spring，但不一致，因为我在将它用于 InputStream 时犯了一个错误.我移动了我所有的 API 来使用改造，上传是列表中的最后一个，我只是覆盖了 TypedFile writeTo() 来更新我读取到 OutputStream 的字节.也许这可以改进，但正如我所说，我是在使用 Spring 时制作的，所以我只是重用了它.这是上传代码，它在我的应用程序上对我有用，如果你想要下载反馈，那么你可以使用@Streaming 并阅读 inputStream.

I had the same problem and finally managed to do it. I was using spring lib before and what I show below kind worked for Spring but was inconsistent since I made a mistake on using it for the InputStream. I moved all my API's to use retrofit and upload was the last one on the list, I just override TypedFile writeTo() to update me on the bytes read to the OutputStream. Maybe this can be improved but as I said I made it when I was using Spring so I just reused it. This is the code for upload and it's working for me on my app, if you want download feedback then you can use @Streaming and read the inputStream.

进度监听器

public interface ProgressListener {
 void transferred(long num);
}

CountingTypedFile

public class CountingTypedFile extends TypedFile {

 private static final int BUFFER_SIZE = 4096;

 private final ProgressListener listener;

 public CountingTypedFile(String mimeType, File file, ProgressListener listener) {
    super(mimeType, file);
    this.listener = listener;
 }

 @Override public void writeTo(OutputStream out) throws IOException {
    byte[] buffer = new byte[BUFFER_SIZE];
    FileInputStream in = new FileInputStream(super.file());
    long total = 0;
    try {
        int read;
        while ((read = in.read(buffer)) != -1) {
            total += read;
            this.listener.transferred(total);
            out.write(buffer, 0, read);
        }
    } finally {
        in.close();
    }
 }
}

MyApiService

public interface MyApiService {
 @Multipart
 @POST("/files")
 ApiResult uploadFile(@Part("file") TypedFile resource, @Query("path") String path);
}

发送文件任务

private class SendFileTask extends AsyncTask<String, Integer, ApiResult> {
    private ProgressListener listener;
    private String filePath;
    private FileType fileType;

    public SendFileTask(String filePath, FileType fileType) {
        this.filePath = filePath;
        this.fileType = fileType;
    }

    @Override
    protected ApiResult doInBackground(String... params) {
        File file = new File(filePath);
        totalSize = file.length();
        Logger.d("Upload FileSize[%d]", totalSize);
        listener = new ProgressListener() {
            @Override
            public void transferred(long num) {
                publishProgress((int) ((num / (float) totalSize) * 100));
            }
        };
        String _fileType = FileType.VIDEO.equals(fileType) ? "video/mp4" : (FileType.IMAGE.equals(fileType) ? "image/jpeg" : "*/*");
        return MyRestAdapter.getService().uploadFile(new CountingTypedFile(_fileType, file, listener), "/Mobile Uploads");
    }

    @Override
    protected void onProgressUpdate(Integer... values) {
        Logger.d(String.format("progress[%d]", values[0]));
        //do something with values[0], its the percentage so you can easily do
        //progressBar.setProgress(values[0]);
    }
}

CountingTypedFile 只是 TypedFile 的副本，但包括 ProgressListener.

The CountingTypedFile is just a copy of TypedFile but including the ProgressListener.

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