跳过60帧！应用程序可能在其主线程上做了太多工作 [英] Skipped 60 frames! The application may be doing too much work on its main thread

问题描述

我正在开发一个应用程序，它应该从网络服务获取 JSON 响应并将每个元素写入 listview，我已经读到我应该使用 AsyncTask获取 HTTP 响应，我做到了，我可以从网络服务中检索数据并将它们显示在 TextViews 中.但是，当我尝试在列表视图中显示元素时，它不显示任何内容 并在 logcat 中给我以下消息:06-05 19:44:27.418: I/Choreographer(20731): 跳过了 60 帧！应用程序可能在其主线程上做了太多工作.

I'm working on a App that should get a JSON response from a webservice and write every element in a listview, I have read that I should work with AsyncTask to get the HTTP Response and I did it and I could retrieve data from the webservice and display them in TextViews. But when I try to display elements in a listview it doesn't display anything and gives me the following message in the logcat : 06-05 19:44:27.418: I/Choreographer(20731): Skipped 60 frames! The application may be doing too much work on its main thread.

这是我的主要代码:

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);
                }
            }   
        }   
    }
    }

我的列表适配器:

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;
    }
}

最后，SearchResults.java:

and finally, SearchResults.java :

public class SearchResults {
    private String address = "";

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

    public String getAddress() {
        return address;
    }
}

那么，我做错了什么?你对此有什么想法吗?

So, what do I do wrong ? Do you have an idea about this ?

谢谢.

推荐答案

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);

    }   
}
}

在所有其他全局变量的 oncreate 之前添加这一行

add this line before the oncreate with all your other global var

   //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)

将此粘贴​​到您的 oncreate 方法上(替换它)

paste this over your oncreate method (replace it)

//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);

}

并将此方法添加到适配器(MyCustomnBaseAdapter 类)代码中

and add this method to the adapter(MyCustomnBaseAdapter class) code

public void setListItems(ArrayList<SearchResult> newList) {
     searchArrayList = newList;
     notifyDataSetChanged();
}

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