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私は Web サービスから JSON 応答を取得し、すべての要素を listview に書き込む必要があるアプリに取り組んでいます。AsyncTaskを使用して HTTP 応答を取得する必要があることを読みました。それを実行したところ、 Web サービスからデータを取得できました。それらをTextViewsに表示します。しかし、リストビューに要素を表示しようとすると、何も表示されず、logcat に次のメッセージが表示されます。06-05 19:44:27.418: I/Choreographer(20731): Skipped 60 frames! The application may be doing too much work on its main thread.

ここに私のメインコードがあります:

public class MainActivity extends Activity {

    private static JsonObject response = new JsonObject();
    private ArrayList<SearchResults> results = new ArrayList<SearchResults>(); 
    private SearchResults sr1 = null;

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

        new LoginAction().execute("");  

        ArrayList<SearchResults> searchResults = results;
        final ListView lv1 = (ListView) findViewById(R.id.ListView01);
        lv1.setAdapter(new MyCustomBaseAdapter(this, searchResults));
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    private class LoginAction extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... params) {

            Map<String, String> callArgs = new HashMap<String, String>(1);

            callArgs.put("suuid", "dtr0bdQGcqwSh3QO7fVwgVfBNWog6mvEbAyljlLX9E642Yfmur");

            try {
                response = EventPulseCloud.call("ListEvents", callArgs);
            } catch (HttpClientException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (JsonException e) {
                e.printStackTrace();
            } 

            return response.get("Type").toString();
        }

        protected void onPostExecute(String result) {

            if(result.equals("success")) {
                JsonArray records = null;
                try {
                    records = response.getObject ("Data").getArray ("Records");
                } catch (JsonException e) {
                    e.printStackTrace();
                }

                for(int i = 0; i < records.count(); i++) {
                    JsonObject record = (JsonObject) records.get(i);
                    sr1 = new SearchResults();
                    sr1.setAddress(record.get("address").toString());
                    results.add(sr1);
                }
            }   
        }   
    }
    }

マイリストアダプター：

public class MyCustomBaseAdapter extends BaseAdapter {
    private static ArrayList<SearchResults> searchArrayList;

    private LayoutInflater mInflater;

    public MyCustomBaseAdapter(Context context, ArrayList<SearchResults> results) {
        searchArrayList = results;
        mInflater = LayoutInflater.from(context);
    }

    public int getCount() {
        return searchArrayList.size();
    }

    public Object getItem(int position) {
        return searchArrayList.get(position);
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.custom_row_view, null);
            holder = new ViewHolder();
            holder.txtAddress = (TextView) convertView.findViewById(R.id.address);

            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.txtAddress.setText(searchArrayList.get(position).getAddress());

        return convertView;
    }

    static class ViewHolder {
        TextView txtAddress;
    }
}

最後に、 SearchResults.java :

public class SearchResults {
    private String address = "";

    public void setAddress(String address) {
        this.address = address;
    }

    public String getAddress() {
        return address;
    }
}

それで、私は何を間違っていますか？これについて何か考えはありますか？

ありがとうございました。

4

2 に答える 2

9 
private class LoginAction extends AsyncTaskList<String, Void, ArrayList<SearchResult>> {

    @Override
    protected ArrayList<SearchResult> doInBackground(String... params) {
        List<SearchResults> resultList =  new ArrayList<SearchResults>();

        Map<String, String> callArgs = new HashMap<String, String>(1);

        callArgs.put("suuid", "dtr0bdQGcqwSh3QO7fVwgVfBNWog6mvEbAyljlLX9E642Yfmur");

        try {
            response = EventPulseCloud.call("ListEvents", callArgs);
        } catch (HttpClientException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JsonException e) {
            e.printStackTrace();
        } 
      //See here I am running the loop in the background so its not on the main thread, then passing the list off to the onpostexecute that way all the main thread does is set the adapter list and notify it of the data update and the list should be updated on the screen
       if( response.get("Type").toString().equals("success")) {
            JsonArray records = null;
            try {
                records = response.getObject ("Data").getArray ("Records");
            } catch (JsonException e) {
                e.printStackTrace();
            }

            for(int i = 0; i < records.count(); i++) {
                JsonObject record = (JsonObject) records.get(i);
                sr1 = new SearchResults();
                sr1.setAddress(record.get("address").toString());
                resultList.add(sr1);
            }
        }  
        return resultList;
    }

    protected void onPostExecute(ArrayList<SearchResult> resultList) {
          setListItems(resultList);

    }   
}
}

他のすべてのグローバル変数とともに oncreate の前にこの行を追加します

   //here you want to create an adapter var with your base adapter so you can set it the updated list later when you have populated data from the internet
         ArrayList<SearchResults> searchResults = new ArrayList<SearchResults>();
         MyCustomBaseAdapter adapter = new MyCustomBaseAdapter(this, searchResults)

これを oncreate メソッドに貼り付けます (置き換えます)

//here is just the code to update your main method to reflect all the changes I made
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    new LoginAction().execute("");  

    final ListView lv1 = (ListView) findViewById(R.id.ListView01);
    lv1.setAdapter(adapter);

}

このメソッドをアダプター (MyCustomnBaseAdapter クラス) コードに追加します。

public void setListItems(ArrayList<SearchResult> newList) {
     searchArrayList = newList;
     notifyDataSetChanged();
}
于 2013-06-05T21:14:20.940 に答える