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我有 2 个活动用于从 .jsp 文件获取数据到 android 设备。我为此使用 GSON。我的项目包括 gson 库。问题是，当我启动活动时，应用程序失败了，并向我显示：不幸的是，应用程序停止了。

主要活动：

public class MainActivity extends Activity {

    TextView capitalTextView;
    ProgressDialog progressDialog;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);    
        setContentView(R.layout.main);
        capitalTextView = (TextView) findViewById(R.id.capital_textview);

        this.retrieveCapitals();
    }

    void retrieveCapitals() {

        progressDialog = ProgressDialog.show(this,
                "Please wait...", "Retrieving data...", true, true);

        CapitalsRetrieverAsyncTask task = new CapitalsRetrieverAsyncTask();
        task.execute();
        progressDialog.setOnCancelListener(new CancelListener(task));       
    }

    private class CapitalsRetrieverAsyncTask extends AsyncTask<Void, Void, Void> {

        Response response;

        @Override
        protected Void doInBackground(Void... params) {
            String url = "http://192.168.1.3:8080/Dochadzka/jsp/Android/GSON.jsp";

            HttpGet getRequest = new HttpGet(url);

            try {
                DefaultHttpClient httpClient = new DefaultHttpClient();
                HttpResponse getResponse = httpClient.execute(getRequest);
                final int statusCode = getResponse.getStatusLine().getStatusCode();

                if (statusCode != HttpStatus.SC_OK) { 
                    Log.w(getClass().getSimpleName(), "Error " + statusCode + " for URL " + url); 
                    return null;
                }

                HttpEntity getResponseEntity = getResponse.getEntity();
                InputStream httpResponseStream = getResponseEntity.getContent();
                Reader inputStreamReader = new InputStreamReader(httpResponseStream);

                Gson gson = new Gson();
                this.response = gson.fromJson(inputStreamReader, Response.class);
            } 
            catch (IOException e) {
                getRequest.abort();
                Log.w(getClass().getSimpleName(), "Error for URL " + url, e);
            }

            return null;
        }

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

            StringBuilder builder = new StringBuilder();
            for (Country country : this.response.data) {

                builder.append(String.format("<br>Country: <b>%s</b><br>Capital: <b>%s</b><br><br>", country.getCountry(), country.getCapital()));

            }

            capitalTextView.setText(Html.fromHtml(builder.toString()));
            progressDialog.cancel();
        }

    }

    private class CancelListener implements OnCancelListener {

        AsyncTask<?, ?, ?> cancellableTask;

        public CancelListener(AsyncTask<?, ?, ?> task) {
            cancellableTask = task;
        }

        @Override
        public void onCancel(DialogInterface dialog) {
            cancellableTask.cancel(true);
        }

    }

}

响应.java：

public class Response {

    ArrayList<Country> data;

    public Response() {
        data = new ArrayList<Country>();
    }

}

我的jsp文件是：

{"data":
   [
     {"country":"Angola", "capital": "Luanda"},
     {"country":"Botswana", "capital": "Gaborone"},
     {"country":"Democratic Republic of the Congo", "capital": "Kinshasa"},
     {"country":"Lesotho", "capital": "Maseru"},
     {"country":"Madagascar", "capital": "Antananarivo"},
     {"country":"Malawi", "capital": "Lilongwe"},
     {"country":"Mauritius", "capital": "Port Louis"},
     {"country":"Mozambique", "capital": "Maputo"},
     {"country":"Namibia", "capital": "Windhoek"},
     {"country":"South Africa", "capital": "Pretoria"},
     {"country":"Swaziland", "capital": "Lobamba"},
     {"country":"Tanzania", "capital": "Dodoma"},
     {"country":"Zambia", "capital": "Lusaka"},
     {"country":"Zimbabwe", "capital": "Harare"}   
   ]
 }

这是错误日志：http: //pastebin.com/K5Qjh6h4

谢谢你。

4

1 回答 1

1

Caused by: java.lang.NoClassDefFoundError: com.google.gson.Gson

GSON 没有与您的项目一起打包和部署。

有关如何将其添加到项目中的说明，请参阅文档。

于 2013-03-20T20:11:11.667 回答