Android - 无法打开堆栈跟踪文件

时间:2013-01-02 09:34:25

标签: android android-asynctask gson stack-trace

我是一名新手Android开发人员,我正在尝试使用GSON和AsynTask从RESTful Web服务获取数据。但是,当调用包含AsynTask类的活动时,我在LogCat中遇到的唯一错误是:

  

01-02 11:17:58.275:E / dalvikvm(807):无法打开堆栈跟踪文件   '/data/anr/traces.txt':是一个目录

然后无法调用doInBackground方法,因此无法从Web服务获得响应。 我已经搜索了这个问题,但大多数人都得到了permission denied或者其他东西,而不是is a directory。因此,如果您对如何解决此问题有任何建议,请帮助我!

如果有人要求包含AsynTask的类的代码,我将其包含在此处:

public class PlaceListActivity extends Activity{

    private ListView m_vwPlaceLayout;
    private ArrayList<Place> m_arrPlaceList;
    private PlaceAdapter m_placeListAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.place_list);
        m_vwPlaceLayout = (ListView) findViewById(R.id.spotListView);
        m_arrPlaceList = new ArrayList<Place>();
        m_placeListAdapter = new PlaceAdapter(this, R.layout.place_view, m_arrPlaceList);
        m_vwPlaceLayout.setAdapter(m_placeListAdapter);
        populateList();
    }

    public void populateList(){
        Intent intent = getIntent();
        String key = intent.getStringExtra("KEYWORD");
        new GetSpots().execute(key);
    }

    private class GetSpots extends AsyncTask<String, Integer, ArrayList<Place>>{

        protected ArrayList<Place> doInBackground(String... keys){
            ArrayList<Place> list = null;
            String url = "http://10.0.2.2:81/HGourmet/getPlaces?key=" + keys[0].trim();
            try{
                RestClient client = new RestClient(url);
                try{
                    client.Execute(RequestMethod.GET);
                }catch(Exception e){
                    e.printStackTrace();
                }

                String json = client.getResponse();
                Gson gson = new Gson();
                Type listType = new TypeToken<ArrayList<Place>>(){}.getType();
                list = gson.fromJson(json, listType);
            }catch(Exception e){}
            return list;
        }

        protected void onProgressUpdate(Integer... progress){

        }

        protected void onPreExecute(){

        }

        protected void onPostExecute(ArrayList<Place> placeList){
            if (placeList != null){
                for (Place place : placeList){
                    m_arrPlaceList.add(place);
                }
                m_placeListAdapter.notifyDataSetChanged();
            }
            else{
                Toast.makeText(PlaceListActivity.this, "No Results!", Toast.LENGTH_LONG).show();
            }
        }
    }

}

1 个答案:

答案 0 :(得分:1)

哦,无论什么时候显示,都会发现堆栈跟踪错误问题。我注意到在doInBackground方法中捕获异常时忘记了打印错误,当我添加它时,我发现错误在于JSON请求的URL。嗯,承认这很令人尴尬,但无论如何我都解决了。