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似乎无法弄清楚为什么我会收到此错误“ArrayList<HashMap<String,String>>, int, String[], int[])未定义”

 // THE ERROR IS RIGHT HERE TO
           ListAdapter adapter = new SimpleAdapter(this, contactList,
                    R.layout.main,
                    new String[] { TAG_FIRSTNAME, TAG_EMAIL, TAG_PHONE }, new int[] {
                            R.id.nameFirst, R.id.email, R.id.mobile });
           //HERE

这是我的代码。这个想法是从应用引擎数据存储中获取 JSON，然后将其划分为列表视图。

package com.indeeditis; 




public class FinderActivity extends ListActivity   {


private static final String TAG_ID = "id";
private static final String TAG_FIRSTNAME = "nameFirst";
private static final String TAG_LASTNAME = "nameLast";
private static final String TAG_EMAIL = "emailAddress";
private static final String TAG_ADDRESS = "address";
private static final String TAG_STATE = "state";

private static final String TAG_PHONE = "phone";
JSONArray contacts = null;

ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.finder);

   // Button start = (Button)findViewById(R.id.button9000);
    //start.setOnClickListener(this);
    new EndpointsTask().execute(getApplicationContext());

}



public class EndpointsTask extends AsyncTask<Context, Integer, Long> {

    public Long doInBackground(Context... contexts) {

      Contactinfoendpoint.Builder endpointBuilder = new Contactinfoendpoint.Builder(
          AndroidHttp.newCompatibleTransport(),
          new JacksonFactory(),
          new HttpRequestInitializer() {
          public void initialize(HttpRequest httpRequest) { }
          });
  Contactinfoendpoint endpoint = CloudEndpointUtils.updateBuilder(
  endpointBuilder).build();

  try {

     // final TextView detail = (TextView)findViewById(R.id.textView100);

    String apples = endpoint.listContactInfo().execute().toString();

    JSONObject jObject = new JSONObject(apples);

           try{
        //Get the element that holds the earthquakes ( JSONArray )
        JSONArray  contacts = jObject.getJSONArray("item");

        for(int i = 0; i < contacts.length(); i++){
            JSONObject c = contacts.getJSONObject(i);

            // Storing each json item in variable
            String id = c.getString(TAG_ID);
            String nameFirst = c.getString(TAG_FIRSTNAME);
            String nameLast = c.getString(TAG_LASTNAME);
            String email = c.getString(TAG_EMAIL);
            String address = c.getString(TAG_ADDRESS);
            String phone = c.getString(TAG_PHONE);

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

            // adding each child node to HashMap key => value
            map.put(TAG_ID, id);
            map.put(TAG_FIRSTNAME, nameFirst);
            map.put(TAG_EMAIL, email);
            map.put(TAG_PHONE, phone);

            // adding HashList to ArrayList
            contactList.add(map);



        }

           }catch(JSONException e)        {
             Log.e("log_tag", "Error parsing data "+e.toString());
           }


             // THE ERROR IS RIGHT HERE TO
           ListAdapter adapter = new SimpleAdapter(this, contactList,
                    R.layout.main,
                    new String[] { TAG_FIRSTNAME, TAG_EMAIL, TAG_PHONE }, new int[] {
                            R.id.nameFirst, R.id.email, R.id.mobile });
           //HERE
           setListAdapter(adapter);

            // selecting single ListView item
            ListView lv = getListView();

  } catch (IOException e) {
    e.printStackTrace();
  } catch (JSONException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}
      return (long) 0;
    }


    }

}
4

2 回答 2

2

SimpleAdapter只有一个构造函数。

public SimpleAdapter (Context context, List<? extends Map<String, ?>> data, int resource, String[] from, int[] to)

您正在使用

new SimpleAdapter(this, // not a Context
                contactList, // List
                R.layout.main, // int
                new String[] { TAG_FIRSTNAME, TAG_EMAIL, TAG_PHONE }, // String[]
                new int[] {R.id.nameFirst, R.id.email, R.id.mobile }); // int[]

wherethis不是 a Context，而是对EndpointsTask实例的引用。使用FinderActivity.thisifEndpointsTask是 的内部类FinderActivity。

于 2013-08-31T14:49:26.320 回答
1

从 Android 文档，

public SimpleAdapter (Context context, List<? extends Map<String, ?>> data, int 
      resource, String[] from, int[] to)

Added in API level 1

Constructor
Parameters
context     The context where the View associated with this SimpleAdapter 
            is running

data        A List of Maps. Each entry in the List corresponds to one row 
            in the list. The Maps contain the data for each row, and should 
            include all the entries specified in "from"

resource    Resource identifier of a view layout that defines the views for this 
            list item. The layout file should include at least those named views
            defined in "to"

from        A list of column names that will be added to the Map associated with 
            each item.

to          The views that should display column in the "from" parameter. 
            These should all be TextViews. The first N views in this list are 
            given the values of the first N columns in the from parameter.

但是在您的代码中，这不是context构造函数的规范。

使用FinderActivity.this . 它会起作用的

于 2013-08-31T14:59:01.540 回答