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如何在ListView中獲得第n個元素

[英]How can I get the n-th element in a ListView

我有一個listView,每行中有兩個項目,一個TextView和一個Switch按鈕。

這就是我創建列表視圖的方式:

rootView = inflater.inflate(R.layout.fragment_list_view, container,false);

ListView list = (ListView) rootView.findViewById(R.id.listViewFragment);

rootView.findViewById(R.id.buttonSubmitPlayersTrainingAttendances) ;

String[] from = { "namePlayer", "switch" };
int[] to = { R.id.textViewPlayerName, R.id.switchAttendance };
List<HashMap<String,String>> aList = new ArrayList<HashMap<String,String>>();


for(int a=0; a < totalPlayers ;a++)
{
HashMap<String, String> hm = new HashMap<String,String>();
             hm.put("namePlayer", playersSurnames.get(a) + " " + playersNames.get(a) );
             aList.add(hm);        
    }


SimpleAdapter adapter = new SimpleAdapter(getActivity().getBaseContext(), aList, R.layout.player_list, from, to);       
list.setAdapter(adapter);

我使用具有listView的layoutfragment_list_view.xml,然后在SimpleAdapter中使用List>(aList)和具有TextView和Switch的player_list.xml布局。 我不知道這是否是正確的方法,但是可以。

fragment_list_view.xml

<ListView
    android:id="@+id/listViewFragment"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true" >
</ListView> 

player_list.xml

<TextView
        android:id="@+id/textViewPlayerName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="TextView" />

<Switch
        android:id="@+id/switchAttendance"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

如您所見,ListView正常運行,並且在屏幕上看到我想要的東西:播放器列表和每個播放器的開關:

截圖-> 圖片

現在,如果我從適配器執行getItem(),我會看到該行的第一個元素(Player1,Player2,...)

我的問題是:如何獲取每行(每個玩家)的切換ID,以查看是否已選中? 而且,如果我以錯誤的方式處理了ListView,您能否解釋一下這樣做的最佳方法是什么? 謝謝

您可能會看一下我對此的回答,即Spannable String僅適用於ListView中的最后一個Item

您可以使用SimpleAdapter替換該ArrayAdapter,如下所示:

    String[] from = {ITEM_ID, ITEM_NAME, ITEM_CHECKED};
    int[] to = {R.id.tvId, R.id.tvDescription, R.id.cb};
    mSimpleAdapter = new SimpleAdapter(this, mDataList, R.layout.custom_list_items, from, to){
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            // Prepare views ready for data
            convertView = super.getView(position, convertView, parent);
            CheckBox cb = (CheckBox) convertView.findViewById(R.id.cb);
            TextView tvDescription = (TextView) convertView.findViewById(R.id.tvDescription);

            cb.setOnClickListener(new OnClickListener(){
                @SuppressWarnings("unchecked")
                @Override
                public void onClick(View view) {
                    CheckBox buttonView = (CheckBox) view;
                    // Get view, position and DataList(position)
                    int pos = (int) buttonView.getTag();
                    HashMap<String, Object> selectedItem = new HashMap<String, Object>();
                    selectedItem = (HashMap<String, Object>) getItem(pos);

                    // Update DataList
                    mDataList.remove(selectedItem);
                    selectedItem.remove(ITEM_CHECKED);
                    if(buttonView.isChecked()){
                        selectedItem.put(ITEM_CHECKED, true);
                        mDataList.add(pos, selectedItem);
                    }else{
                        selectedItem.put(ITEM_CHECKED, false);
                        mDataList.add(pos, selectedItem);
                    }

                    // Update all UI views by
                    Toast.makeText(getApplicationContext(), ""+pos+" Changed", Toast.LENGTH_SHORT).show();
                    notifyDataSetChanged();
                }
            });
            // Get data from DataList
            @SuppressWarnings("unchecked")
            HashMap<String, Object> currentItem = (HashMap<String, Object>) getItem(position);
            toggleLineThrough(tvDescription, (String)currentItem.get(ITEM_NAME), (boolean)currentItem.get(ITEM_CHECKED));

            // Save position to CheckBox, so position can be retrieved when CheckBox is clicked
            cb.setTag(position);

            return convertView;
        }
    };
    mListView.setAdapter(mSimpleAdapter);

希望對您有所幫助!

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