如何獲取點擊gridview項目時自定義gridview適配器hashmap的數據？

Question

在我的應用我想保存使用下面ArrayList<HashMap<String, String>> 數據是我的代碼：

JsonArrayRequest req = new JsonArrayRequest(Constants.DARSHAN_URL+Constants.MAIN_CATEGORY, 
       new Response.Listener<JSONArray>() { 
        @Override 
        public void onResponse(JSONArray response) { 
         Log.d(TAG, response.toString()); 

         try { 
          // Parsing json array response 
          // loop through each json object 
          for (int i = 0; i < response.length(); i++) { 

           JSONObject person = (JSONObject) response.get(i); 

           String material_id = person.getString("material_id"); 
           String material_desc = person.getString("material_desc"); 

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

           maim_category_array.put("material_id", material_id); 
           maim_category_array.put("material_desc", material_desc); 

           categoryName.add(maim_category_array); 

          } 

          adapter = new GridviewAdapter(MainCategoryActivity.this, categoryName); 
          grid.setAdapter(adapter); 

而下面是我的GridViewCoustomAdapter：

public class GridviewAdapter extends BaseAdapter 
{ 
    private ArrayList<HashMap<String, String>> listCountry; 
    private Activity activity; 

    public GridviewAdapter(Activity activity, ArrayList<HashMap<String, String>> listCountry) { 
     super(); 
     this.listCountry = listCountry; 
     this.activity = activity; 
    } 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return listCountry.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     // TODO Auto-generated method stub 
     return listCountry.get(position); 
    } 

    @Override 
    public long getItemId(int position) { 
     // TODO Auto-generated method stub 
     return 0; 
    } 

    public static class ViewHolder 
    { 
     public TextView txtViewTitle; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     // TODO Auto-generated method stub 
     ViewHolder view; 
     LayoutInflater inflator = activity.getLayoutInflater(); 

     if(convertView==null) 
     { 
      view = new ViewHolder(); 
      convertView = inflator.inflate(R.layout.button_layout, null); 

      view.txtViewTitle = (TextView) convertView.findViewById(R.id.btn_select); 

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

     HashMap<String, String> map = new HashMap<String, String>(); 
     map = listCountry.get(position); 
     view.txtViewTitle.setText(map.get("material_desc")); 

     return convertView; 
    }} 

現在我想要得到的material_Id發送到下一個活動。即我想matrial_Id onItemClick GridView控件 的例如：

grid.setOnItemClickListener(new OnItemClickListener() { 
          @Override 
          public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) { 

           Toast.makeText(MainCategoryActivity.this, adapter.getItem(position), Toast.LENGTH_SHORT).show(); 
           Intent i = new Intent(MainCategoryActivity.this, ProductNameActivity.class); 

           i.putExtra("MATERIAL_ID", <material_id>); 
           i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP); 
           startActivity(i); 
          } 
         }); 

我怎樣才能做到這一點？

請幫忙!!

Answer 1

在onItemClick

HashMap<String, String> map = (HashMap<String, String>)arg0.getItemAtPosition(position); 

然後

String id = map.get("material_id");