Select multiple items from the list and change the color of only the selected item.

Question

I want to make a view where I can select several items from the list, and also side by side changes the color of the selected list item and saves this item in my arraylist. My list is shown below:

But when I used it to scroll ... It shows me another element, even I do not select it:

But I want only the color of the list item to change when I click ...

I use code like:

     private class ItemsAdapter extends ArrayAdapter<String> {
 List<String> items;
  Context context;
  private LayoutInflater inflater;
  public ItemsAdapter(Context context, List<String> part_array_list) {
     super( context, R.layout.part_list, R.id.label,part_array_list );

     inflater = LayoutInflater.from(context) ;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
      TextView textView ; 
    String item = (String) this.getItem( position ); 

      if ( convertView == null ) {
        convertView = inflater.inflate(R.layout.part_list, null);

        // Find the child views.
        textView = (TextView) convertView.findViewById( R.id.label );


        // Optimization: Tag the row with it child views, so we don't have to 
        // call findViewById() later when we reuse the row.
        convertView.setTag( new ListViewHolder(textView) );


      }
      // Reuse existing row view
      else {
        // Because we use a ViewHolder, we avoid having to call findViewById().
        ListViewHolder viewHolder = (ListViewHolder) convertView.getTag();

        textView = viewHolder.getTextView() ;

      }


      textView.setText( part_array_list.get(position) );      

      return convertView;


      }
      }
        /** Holds child views for one row. */
           private class ListViewHolder {

 private TextView textView ;
 public ListViewHolder() {}
 public ListViewHolder( TextView textView ) {

   this.textView = textView ;
 }

 public TextView getTextView() {
   return textView;
 }
 public void setTextView(TextView textView) {
   this.textView = textView;
 }    

}

and in the OnCreate () method,

         final ArrayAdapter<String> part_list_adapter=new ItemsAdapter(AssetSearch.this, part_array_list);
        //PartNumber_List.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    PartNumber_List.setAdapter(part_list_adapter);

    PartNumber_List.setOnItemClickListener(new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> parent, View v, int position,
            long id) {
         ListViewHolder viewHolder = (ListViewHolder) v.getTag();
         viewHolder.getTextView().setBackgroundColor(R.color.result_image_border);

        String item=(String) part_list_adapter.getItem((int) id);
        });

Answer 1

, , - convertView. , , .

, , , , . , getView() reset . , , , . , :

textView.setBackgroundColor(android.R.color.transparent);

, , , , . , ArrayList Integer . onItemClick() , ArrayList. , , :

public ArrayList<Integer> selectedIds = new ArrayList<Integer>();

. onItemClick :

@Override
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {

     ArrayList<Integer> selectedIds = ((ItemsAdapter) parent).selectedIds;
     Integer pos = new Integer(position);
     if(selectedIds.contains(pos) {
         selectedIds.remove(pos);
     }
     else {
         selectedIds.add(pos);
     }

     parent.notifyDataChanged();
}

, , getView() :

textView.setBackground(selectedIds.contains(position) ? R.color.result_image_border : androi.R.color.transparent);  

Answer 2

, - , . , , .

@Override
public int getItemViewType(int position) {
    return IGNORE_ITEM_VIEW_TYPE;
}

Answer 3

, View Activity. getView , setBackgroundColor . .

Answer 4

, ConvertView itemClick, - , , , ,

public View getView(final int position, View convertView, ViewGroup parent) {
         System.gc();
         final ViewHolder holder;

         if (convertView == null) {
             convertView = mInflater.inflate(R.layout.albumlist, null);
             holder = new ViewHolder();
             holder.albumName = (TextView) convertView.findViewById(R.id.albumDetails);

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


         holder.albumName.setText(albumData[position][0]);

         holder.albumName.setOnClickListener(new View.OnClickListener() {
             public void onClick(View v) {
                 holder.albumName.setBackgroundColor(R.color.black);


             }});

         return convertView;
 }

     class ViewHolder {

         TextView albumName;


     }

o/p

Answer 5

, - , , getView() .

Answer 6

, @JasonRobinson:

if(selectedIds.contains(pos) {
         selectedIds.remove(pos); -> **selectedIds.remove(selectedIds.indexOf(pos));**
     }
     else {
         selectedIds.add(pos);
     }

Answer 7

() , ! ArrayList !!!
ArrayList.remove(int) item !
ArrayList<Integer > , ot, . :

private int getIndex(int value) {
    int index = -1;

    for(int i=0; i<selectedIds.size(); i++) {
        if(selectedIds.get(i)==value) {
            index = i;
            break;
        }
    }

    return index;
}

Or use the method ArrayList.indexOf(Object)to get the index.

And now, how to get a link to your adapter from FragmenList or ListActivity. Just use the class variable:

public class SimpleFragment extends ListFragment {
    private MyCustomAdapter mAdapter;

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        mAdapter = new MyCustomAdapter(getActivity(), R.layout.row_layout);
        setListAdapter(mAdapter);
    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        // now you have an access to your adapter through class variable mAdapter
    }
}

Answer 8

So what the hell is the solution to this problem ?? The accepted answer with a green tick does not work. Throws an error here:

ArrayList selectedIds = ((listViewAdapter) parent) .selectedIds;

Why is this an accepted answer when it does not work?