java - 如何在数组列表中添加选定的值并从数组列表中删除未选定的值

Question

我有一个带有一个按钮的“ListView”。当用户单击按钮时，我在数组列表中添加了选定的位置值。但是当用户第二次单击同一个按钮时，我想从数组列表中删除此按钮条目如何执行此操作。这是我的代码 fragment

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    if (convertView == null) {
        LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
        convertView = layoutInflater.inflate(R.layout.single_row, null);


    }
    TextView msg = (TextView) convertView.findViewById(R.id.tv_wishdata);
    msg.setText(al.get(position));
    ArrayList arrayList = new ArrayList();

    final ArrayList list = new ArrayList<String>();
    final   ImageView   iv = (ImageView) convertView.findViewById(R.id.iv_myImageview);
    final ListView lis = (ListView) convertView.findViewById(R.id.listView);
    Boolean click = true;
    iv.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            List<String> listOfFavoritePhrases = new ArrayList<String>();
            //check boolean value
            if (click) {
                iv.setBackgroundResource(R.drawable.thirdwish);
                /*TinyDB tinyDB = new TinyDB(context);
                tinyDB.putString("msg", al  .get(position));
*/            // al.add(al.get(position))

                temp.add(al.get(position));

                Log.d("ARRAY DATA", "" + temp);
                Log.d("ARRAY SIZE", "" + temp.size());

                /*ContentValues contentValues = new ContentValues();
                contentValues.put("item",al.get(position));
                Log.d("Contentvalues",""+contentValues.toString());
                db.insert("favorite",null,contentValues);*/

                sp = context.getSharedPreferences("mypref",Context.MODE_APPEND);
                SharedPreferences.Editor editor = sp.edit();
                editor.putString("phrases", TextUtils.join(",", temp.toArray()));
                Log.d("Shared Data", "" + sp.getString("phrases", ""));
                editor.commit();
                click = false;

            }
            else {
                click = true;
                temp.remove(al.get(position));
                iv.setBackgroundResource(R.drawable.onewish);
               // db.rawQuery("delete from favorite where item like'%" + al.get(position) + "%'", null);
                Log.d("QUERY", "" + al.get(position));
                // al.remove(position);
                notifyDataSetChanged();
            }
            // Toast.makeText(context, "imageview clicked", Toast.LENGTH_LONG).show();
        }
    });
    return convertView;
}

Answer 1

根据你的问题猜测，我做了如下的解决方案。

初始化ArrayList:

ArrayList<String> selectedString = new ArrayList<>();

现在onClick:

if(selectedString.contains(al.get(position))){
   selectedString.remove(al.get(position));
}else {
   selectedString.add(al.get(position));
}

希望这有意义。