spinner部分用法

1；让默认的提示值，不出现在下拉列表中

事例代码：

public ArrayList<String> arrList = new ArrayList<String>();private void SelectHistory(){    arrList.add(getString(R.string.Select));    arrList.add(getString(R.string.all_device));    arrList.add(getString(R.string.SelectInvert));    mSpinnerSelect = (Spinner) mActivity.findViewById(R.id.spinner_device);    ArrayAdapter<String> mSpinnerSelectAdapter = new ArrayAdapter<String>(getActivity(), R.layout            .layout_history_report_lv_option_items, arrList) {        @Override        public View getView(int position, View convertView, ViewGroup parent) {            View v = super.getView(position, convertView, parent);            Iterator iter = arrList.iterator();            while (iter.hasNext()) {                if (iter.next().equals(getString(R.string.Select))) {                    iter.remove();                }            }            return v;        }        @Override        public int getCount() {            return arrList.size();        }    };    mSpinnerSelectAdapter.setDropDownViewResource(R.layout            .layout_history_report_lv_option_items);    mSpinnerSelect.setAdapter(mSpinnerSelectAdapter);    mSpinnerSelect.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {        @Override        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {            if ( arrList.get(0).equals(getString(R.string.all_device)))            {                mLvAdapter.selectedAll();            } else if(arrList.get(1).equals(R.string.SelectInvert))            {                if (mLvAdapter.reverseSelected())                {                    refreshState();                }            }        }        @Override        public void onNothingSelected(AdapterView<?> parent) {        }    });}

2：获取点击的值：

1.   //拿到被选择项的值  
2.                 str = (String) sp.getSelectedItem();  

方法二：

        Spinner spinner = (Spinner) adapterView; 


String itemContent = (String) adapterView .getItemAtPosition(position);

注：下拉选择事件能不能重复触发同一项选项内容

解：

1.  @Override  
2.         public void onItemSelected(AdapterView<?> arg0, View arg1,  
3.                 int arg2, long arg3) {  
4.             // TODO Auto-generated method stub  
5.             try {  
6.                 //以下三行代码是解决问题所在  
7.                 Field field = AdapterView.class.getDeclaredField("mOldSelectedPosition");  
8.                 field.setAccessible(true);  //设置mOldSelectedPosition可访问  
9.                 field.setInt(spinner, AdapterView.INVALID_POSITION); //设置mOldSelectedPosition的值  
10.             } catch (Exception e) {  
11.                 e.printStackTrace();  
12.             }  
13.         }  
14.   
15.         @Override  
16.         public void onNothingSelected(AdapterView<?> arg0) {  
17.             // TODO Auto-generated method stub  
18.               
19.         }  
20.     };