在 Android 中使用 Azure 必应搜索 API

Question

我正在尝试制作一个执行图像搜索并在网格中显示图像结果的应用程序。由于 Google Image Search API 已弃用且很快将不再可用，因此我正在尝试使用 Bing Search API。

但是，我收到以下错误：

java.io.IOException: No authentication challenges found
    at libcore.net.http.HttpURLConnectionImpl.getAuthorizationCredentials(HttpURLConnectionImpl.java:427)
    at libcore.net.http.HttpURLConnectionImpl.processAuthHeader(HttpURLConnectionImpl.java:407)
    at libcore.net.http.HttpURLConnectionImpl.processResponseHeaders(HttpURLConnectionImpl.java:356)
    at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:292)
    at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:168)
    at libcore.net.http.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:271)

我按照http://learn-it-stuff.blogspot.com/2012/09/using-bing-custom-search-inside-your.html 中的示例进行操作。如果有人遇到过这个问题，或者可以帮助我，那将不胜感激。谢谢！

到目前为止，这是我的代码：

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        AsyncTask <Void, Void, Void> task = new AsyncTask <Void, Void, Void> () {

            protected Void doInBackground(Void... args) {

                //  Uri uri = Uri.parse("https://www.google.com/search?tbm=isch&q=penguin");
                //  Intent intent = new Intent(Intent.ACTION_VIEW, uri);
                //  startActivity(intent);

                /*-------------------------Bing search-------------------------*/
                String searchText = "Hello World";
                searchText = searchText.replace(" ", "%20");
                String accountKey = "MY_APP_ID";
                accountKey = accountKey.replace("+", "%2B");

                byte[] accountKeyBytes = Base64.encodeBase64((accountKey + ":" + accountKey).getBytes());
                String accountKeyEnc = new String(accountKeyBytes);
                URL url;
                try {

                    url = new URL(
                            "https://api.datamarket.azure.com/Bing/Search/v1/"
                                    + "Image?Query=%27" + searchText + "%27");

                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                    conn.setRequestMethod("GET");
                    conn.setRequestProperty("Accept", "application/json");
                    conn.setRequestProperty("Authorization", "Basic " + accountKeyEnc);
                    BufferedReader br = new BufferedReader(new InputStreamReader(
                            (conn.getInputStream())));
                    StringBuilder sb = new StringBuilder();
                    String output;
                    System.out.println("Output from Server .... \n");
                    while ((output = br.readLine()) != null) {
                        sb.append(output);
                    }

                    conn.disconnect();

                    System.out.println(sb);

                } catch (MalformedURLException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }

                return null;
            }
        };

        task.execute();
    }
}

Answer 1

以下代码对我有用：

public class SearchAsyncTask extends AsyncTask<Void, Void, Void> {

private final String TAG = getClass().getName();

private String mSearchStr;
private int mNumOfResults = 0;

private Callback mCallback;
private BingSearchResults mBingSearchResults;
private Error mError;

public SearchAsyncTask(String searchStr, int numOfResults, Callback callback) {
    mSearchStr = searchStr;
    mNumOfResults = numOfResults;
    mCallback = callback;
}

@Override
protected Void doInBackground(Void... params) {
    try {
        String searchStr = URLEncoder.encode(mSearchStr);
        String numOfResultsStr = mNumOfResults <= 0 ? "" : "&$top=" + mNumOfResults;
        String bingUrl = "https://api.datamarket.azure.com/Bing/SearchWeb/v1/Web?Query=%27" + searchStr + "%27" + numOfResultsStr + "&$format=json";
        String accountKey = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
        byte[] accountKeyBytes = Base64.encodeBase64((accountKey + ":" + accountKey).getBytes());
        String accountKeyEnc = new String(accountKeyBytes);

        URL url = null;
        url = new URL(bingUrl);

        URLConnection urlConnection = url.openConnection();
        urlConnection.setRequestProperty("Authorization", "Basic " + accountKeyEnc);
        InputStream response = urlConnection.getInputStream();
        String res = readStream(response);

        Gson gson = (new GsonBuilder()).create();
        mBingSearchResults = gson.fromJson(res, BingSearchResults.class);

        Log.d(TAG, res);
        //conn.disconnect();

    } catch (Exception e) {
        e.printStackTrace();
        mError = new Error(e.getMessage(), e);
        //Log.e(TAG, e.getMessage());
    }

    return null;
}

@Override
protected void onPostExecute(Void result) {
    super.onPostExecute(result);

    if (mCallback != null) {
        mCallback.onComplete(mBingSearchResults, mError);
    }

}

private String readStream(InputStream in) {
    BufferedReader reader = null;
    StringBuilder sb = new StringBuilder();
    try {
        reader = new BufferedReader(new InputStreamReader(in));
        String line = "";
        while ((line = reader.readLine()) != null) {
            //System.out.println(line);
            sb.append(line + "\n");
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (reader != null) {
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return sb.toString();


}
public interface Callback {
void onComplete(Object o, Error error);
}
    }

解析结果：

public class BingSearchResults {

public ResultsContent d;

public static class ResultsContent {
    public Result[] results;
    public String __next;
}

public static class Result {
    public String ID;
    public String Title;
    public String Description;
    public String DisplayUrl;
    public String Url;
    public Metadata __metadata;

}

public static class Metadata {
    public String uri;
    public String type;
}

public Result[] getResults(){
    if (d == null)
        return null;
    return d.results;
}

public String getNextUrl(){
    if (d == null)
        return null;
    return d.__next;
}

public boolean isEmpty(){
    return (d == null || d.results == null || d.results.length == 0);
}

public int size(){
    if (d == null || d.results == null)
        return 0;
    return d.results.length;
}
}

您还需要包含外部 jars commons-codec-1.9.jar 和 gson-2.2.4.jar

Answer 2

这段代码会发生一点点变化，有时编码器的编译错误会产生问题byte[] accountKeyBytes = Base64.encodeBase64((accountKey + ":" + accountKey).getBytes());