使用谷歌图书API [英] Using Google Book API

问题描述

您好我是新来的Andr​​oid和使用Web的API。我目前正在写，可以从一本书扫描酒吧code，然后搜索谷歌图书为它的应用程序。

Hi I'm new to Android and using web APIs. I'm currently writing an application that can scan a barcode from a book and then search Google Books for it.

到目前为止，我实现Scandit到我的申请，注册，并得到了来自谷歌API控制台图书API的API密钥。从那里，我不知道如何继续，并开始对其进行编码。因此，从我的理解到目前为止，它要求我通过URI发出请求的数据，但我卡在如何实际code吧。我想知道如果任何人都可以点我朝着正确的方向或提供样品code，它展示了如何使用URI来获取数据。

So far I implemented Scandit into my application and I registered and got the API key from Google API console for Books API. From there I do not know how to continue and start coding it. So far from my understanding it requires me make a request data via uri but I'm stuck on how to actually code it. I'm wondering if anyone could point me to the right direction or provide a sample code that shows how to fetch data using URI.

我也下载了的压缩图书API的jar包库，我需要利用这个？我问这个，因为从这个网站在谷歌Places API的一个问题，答案中的一个说，你需要的是使用谷歌API作为构建目标，它不需要任何Jar文件，但这并不适用于书籍API作为呢？

I also downloaded the zipped Book API Jar libraries do I need to make use of this? I ask this because from a question on Google Places API on this website, one of the answer said that all you need is to use Google API as the build target and it doesn't require any Jar files but does this apply to Books API as well?

另外我使用Eclipse，我应该把我的构建目标是谷歌API的16？我猜这是对的，因为我计划在未来使用谷歌地图与此应用程序。

Also I'm using Eclipse, should I set my build target to be Google APIs 16? I'm guessing this is right since I plan to use Google Maps in future with this app.

由于这是第一次我问一个问题就在这里。

Thanks this is first time I asked a question on here.

推荐答案

我刚刚完成这样做我自己。这就是我如何实现它使用 HttpURLConnection类和的AsyncTask （我只需要调用的 https://www.googleapis.com/books/v1/volumes?q=isbn ：+ yourISBN并解析JSON）：

I just finished doing this myself. This is how I implemented it using an HttpURLConnection and an AsyncTask (I just call "https://www.googleapis.com/books/v1/volumes?q=isbn:"+yourISBN and parse the JSON):

// Received ISBN from Barcode Scanner. Send to GoogleBooks to obtain book information.
class GoogleApiRequest extends AsyncTask<String, Object, JSONObject>{

    @Override
    protected void onPreExecute() {
        // Check network connection.
        if(isNetworkConnected() == false){
            // Cancel request.
            Log.i(getClass().getName(), "Not connected to the internet");
            cancel(true);
            return;
        }
    }
    @Override
    protected JSONObject doInBackground(String... isbns) {
        // Stop if cancelled
        if(isCancelled()){
            return null;
        }

        String apiUrlString = "https://www.googleapis.com/books/v1/volumes?q=isbn:" + isbns[0];
        try{
            HttpURLConnection connection = null;
            // Build Connection.
            try{
                URL url = new URL(apiUrlString);
                connection = (HttpURLConnection) url.openConnection();
                connection.setRequestMethod("GET");
                connection.setReadTimeout(5000); // 5 seconds
                connection.setConnectTimeout(5000); // 5 seconds
            } catch (MalformedURLException e) {
                // Impossible: The only two URLs used in the app are taken from string resources.
                e.printStackTrace();
            } catch (ProtocolException e) {
                // Impossible: "GET" is a perfectly valid request method.
                e.printStackTrace();
            }
            int responseCode = connection.getResponseCode();
            if(responseCode != 200){
                Log.w(getClass().getName(), "GoogleBooksAPI request failed. Response Code: " + responseCode);
                connection.disconnect();
                return null;
            }

            // Read data from response.
            StringBuilder builder = new StringBuilder();
            BufferedReader responseReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line = responseReader.readLine();
            while (line != null){
                builder.append(line);
                line = responseReader.readLine();
            }
            String responseString = builder.toString();
            Log.d(getClass().getName(), "Response String: " + responseString);
            JSONObject responseJson = new JSONObject(responseString);
            // Close connection and return response code.
            connection.disconnect();
            return responseJson;
        } catch (SocketTimeoutException e) {
            Log.w(getClass().getName(), "Connection timed out. Returning null");
            return null;
        } catch(IOException e){
            Log.d(getClass().getName(), "IOException when connecting to Google Books API.");
            e.printStackTrace();
            return null;
        } catch (JSONException e) {
            Log.d(getClass().getName(), "JSONException when connecting to Google Books API.");
            e.printStackTrace();
            return null;
        }
    }
    @Override
    protected void onPostExecute(JSONObject responseJson) {
        if(isCancelled()){
            // Request was cancelled due to no network connection.
            showNetworkDialog();
        } else if(responseJson == null){
            showSimpleDialog(getResources().getString(R.string.dialog_null_response));
        }
        else{
            // All went well. Do something with your new JSONObject.
        }
    }
}

protected boolean isNetworkConnected(){

    // Instantiate mConnectivityManager if necessary
    if(mConnectivityManager == null){
        mConnectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    }
    // Is device connected to the Internet?
    NetworkInfo networkInfo = mConnectivityManager.getActiveNetworkInfo();
    if(networkInfo != null && networkInfo.isConnected()){
        return true;
    } else {
        return false;
    }
}

我省略了code为我的对话方法，因为它们是不相关的。希望这有助于。

I've omitted the code for my dialog methods as they are not relevant. Hope this helps.

这篇关于使用谷歌图书API的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！