如何使用必应翻译服务在安卓上播放特定单词的音频

Question

我正在尝试将我的WP7应用程序移植到Android。 我正在使用Bing翻译服务下载和播放特定单词/短语的音频。 如何在安卓中执行此操作？在必应中，流以.wav文件的形式出现。这是我的WP7代码：

private void button1_Click(object sender, RoutedEventArgs e)  
    {  
        this.Speak();  
    }  
    public void Speak()  
    {  
        string appId = "Your ID";  
        string text = "Speak this for me";  
        string language = "en";  
        string uri = "http://api.microsofttranslator.com/v2/Http.svc/Speak?appId=" + appId +  
                "&text=" + text + "&language=" + language + "&file=speak.wav";  
        WebClient client = new WebClient();  
        client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);  
        client.OpenReadAsync(new Uri(uri));  
    }  
    void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)  
    {  
        if (e.Error != null) return;  
        var sound = e.Result;  
        Player.Source = null;  
        string filename = "MyAudio";  
        using (IsolatedStorageFile userStoreForApplication = IsolatedStorageFile.GetUserStoreForApplication())  
        {  
            bool fileExists = userStoreForApplication.FileExists(filename);  
            if (fileExists)  
            {  
                userStoreForApplication.DeleteFile(filename);  
            }  
            var isolatedStorageFileStream = userStoreForApplication.CreateFile(filename);  
            using (isolatedStorageFileStream)  
            {  
                SaveFile(e.Result, isolatedStorageFileStream);  
                if (e.Error == null)  
                {  
                    Player.SetSource(isolatedStorageFileStream);  
                }  
            }  
        }    
    }  
    public static void SaveFile(System.IO.Stream input, System.IO.Stream output)  
    {  
        try 
        {  
            byte[] buffer = new byte[32768];  
            while (true)  
            {  
                int read = input.Read(buffer, 0, buffer.Length);  
                if (read <= 0)  
                {  
                    return;  
                }  
                output.Write(buffer, 0, read);  
            }  
        }  
        catch (Exception ex)  
        {  
            MessageBox.Show(ex.ToString());  
        }  
    }   

    void mysound_MediaFailed(object sender, ExceptionRoutedEventArgs e)  
    {  
        MessageBox.Show(e.ErrorException.Message);  
    }  
    void mysound_MediaOpened(object sender, RoutedEventArgs e)  
    {  
        Player.Play();  
    } 

Answer 1

我以为我只会删除有关执行HTTP请求和下载文件的通用响应，但是我遇到的更麻烦的事情是Azure想要如何进行身份验证Microsoft。显然，不推荐使用应用程序 ID，他们的 API 对请求标头和参数非常挑剔。

无论如何，我建议从编写处理执行HttpURLConnection的AsyncTask开始。我最终得到：

/**
 * Tailor-made HTTP request for Microsoft Azure, downloading a file to a
 * specified location.
 */
private class HttpDownloadFile extends AsyncTask<String, Integer, String> {
    private String mDir;
    @Override
    protected String doInBackground(String... params) {
        if (params.length < 2) {
            throw new IllegalArgumentException(
                    "Two arguments required for "
                            + getClass().getSimpleName());
        }
        String response = null;
        String uri = params[0];
        String query = params[1];
        try {
            if (query.length() > 0) {
                uri += "?" + query;
            }
            URL url = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) url
                    .openConnection();
            connection.setRequestProperty("Content-Type",
                    "application/x-www-form-urlencoded");
            if (params.length > 2) {
                connection.setRequestProperty("Authorization", "Bearer "
                        + params[2]);
            }
            connection.connect();
            int fileLength = connection.getContentLength();
            String charset = PREFERRED_CHARSET;
            if (connection.getContentEncoding() != null) {
                charset = connection.getContentEncoding();
            }
            InputStream input;
            OutputStream output;
            boolean isError = false;
            try {
                input = connection.getInputStream();
                output = new FileOutputStream(mDir);
            } catch (IOException e) {
                input = connection.getErrorStream();
                output = new ByteArrayOutputStream();
                isError = true;
            }
            byte data[] = new byte[1024];
            long total = 0;
            int count;
            while ((count = input.read(data)) != -1) {
                total += count;
                publishProgress((int) (total * 100 / fileLength));
                output.write(data, 0, count);
            }
            output.flush();
            if (!isError) {
                response = mDir;
            } else {
                response = ((ByteArrayOutputStream) output).toString(charset);
                Log.e(TAG, response);
                response = null;
            }
            output.close();
            input.close();
        } catch (Exception e) {
            Log.e(TAG, "Failed requesting " + uri, e);
        }
        return response;
    }
}

然后，您可以使用正确的参数执行任务：

HttpDownloadFile task = new HttpDownloadFile();
task.execute(
        getString(R.string.url_speak),
        getString(R.string.url_speak_query,
                text, toLanguage, file),
        accessToken,
        Environment.getExternalStorageDirectory().getPath()
                + "/temp.wav");

我的strings.xml包含：

<string 
    name="url_speak" 
    formatted="false" 
    translate="false">http://api.microsofttranslator.com/v2/Http.svc/Speak</string>
<string 
    name="url_speak_query" 
    formatted="false" 
    translate="false">text=%s&amp;language=%s&amp;file=%s</string>

不幸的是，这意味着您必须编写代码才能获取已完成的身份验证令牌。不用担心！我也为所有这些编写了完整的代码：

1. MainActivity.java
2. strings.xml

Answer 2

这

对我来说似乎很简单，首先使用HttpUrlConnection若要调用 Web 服务，然后将响应作为 WAV 文件处理，可以先将文件保存在本地，然后将其加载到Mediaplayer实例中，也可以直接将其作为实时流加载。