java - 填充Listview时Arraylist和Hashmap的问题

Question

我正在尝试将数据从 JSON 文件获取到 HashMap，然后获取到我的 Arraylist，它应该显示在 Listview 中。但它没有显示任何东西。你能帮我吗？

公共(public)类 SendPostRequest 扩展 AsyncTask {

    String data ="";
    protected void onPreExecute(){}

    protected String doInBackground(String... arg0) {

       try{


                JSONArray json = new JSONArray(data);
                ArrayList<HashMap<String, String>>  arrayList = new ArrayList<HashMap<String, String>>();

                HashMap<String, String> map = new HashMap<String, String>();

                try {
                for(int i=0;i<json.length();i++){
                    JSONObject e =json.getJSONObject(i);

                    map.put("id", String.valueOf(i));
                    map.put("Name", "Vorname: " + e.getString("meta_value"));
                    map.put("orderid", "id: " + e.getString("post_id"));
                    arrayList.add(map);
                    //return map.toString();
                }

                    ArrayAdapter arrayAdapter = new ArrayAdapter(activity2.this, android.R.layout.simple_list_item_1,arrayList);

                }catch (JSONException e){
                    Log.e(this.getClass().getName(), "Some JSON error occurred" + e.getMessage());

                }
                return data;


            }
            else {
                return new String("false : "+responseCode);
            }
        }
        catch(Exception e){
            return new String("Exception: " + e.getMessage());
        }

    }

Answer 1

要填充 ListView ，您需要在创建数组适配器后添加这段代码

ListView myListView = (ListView) findViewById(R.id.idOfYourListView)

runOnUiThread(new Runnable() 
{
    @Override
    public void run()
    {
     myListView.setAdapter( arrayAdapter );
    }
});