如何在ListView中获得第n个元素

Question

I have a listView with two items inside each row, a TextView and a Switch button.

This is how I created the List View:

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);

I used the layout fragment_list_view.xml which has the listView and then in the SimpleAdapter I used a List> (aList) and the layout player_list.xml which has a TextView and a Switch. I don't know if it is the right way to do this but it works.

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" />

As you can see the ListView works and I see on the screen what I want : the list of the players and the switches for each player:

Screenshot --> Image

Now, if I do a getItem() from the adapter I see the first element of the row (Player1, Player2,...)

My question is: how can I get the Switch Id of each row (each player) to see if it's checked or not? And if I did the ListView in the wrong way can you explain me what is the best way to do that? Thank you

Answer 1

You may take a look of my answer to this, Spannable String only working for last Item in ListView .

You can replace that ArrayAdapter with SimpleAdapter, like this:

    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);

Hope that help!