的ArrayList HashMap的是未定义

似乎无法找出为什么我得到这个错误“ArrayList<HashMap<String,String>>, int, String[], int[])是不确定的”的ArrayList HashMap的是未定义

// 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

这里是我的代码。这个想法是从应用程序引擎数据存储中获取JSON，然后将其分成列表视图。

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; 
    } 


    } 

}

来源

2013-08-31 johnsonjp34

你从哪里得到这个错误？并且请从那里删除不相关的代码。特别是进口。 –

粘贴确切完整的错误信息，并告诉我们它指的是哪一行。 –

@JBNizet构造函数SimpleAdapter（FinderActivity.EndpointsTask，ArrayList >，int，String []，int []）未定义 – johnsonjp34

SimpleAdapter只有一个constructor。

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[]

其中this不是Context，但对EndpointsTask实例的引用。如果EndpointsTask是FinderActivity的内部类别，则使用FinderActivity.this。

来源

2013-08-31 14:49:26

修复它。谢谢！ – johnsonjp34

@ coconuts4eva不客气。考虑在可以的时候接受答案。 –

从Android的文档，

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.

但在你的代码这不是context按构造的规范。

使用FinderActivity.this。它会工作

来源

2013-08-31 14:59:01 Prateek

的ArrayList HashMap的是未定义

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