Question

我有一个自定义列表视图，我在列表中选择了多个项目，现在我需要在单击按钮时调用listfunction（）方法获取这些项目名称，您可以在下面的代码中看到这一点。 / p>

public class Places extends Activity {

    private ListView listView;

    private static int selectedListItem = -1;
    private Handler mHandler = new Handler();
    private static Vector<String> data; 

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.places_custom_list_view);
        data = new Vector<String>();

        // Add data as per your requirement   
        data.add("one");
        data.add("two");
        data.add("three");
        data.add("four");
        data.add("five");
        data.add("six");

        listView = (ListView)findViewById(R.id.ListView01);
        listView.setDivider(null);

        listView.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //System.out.println(EfficientAdapter.saveState.get(position));
                selectedListItem = position;
                ((EfficientAdapter)listView.getAdapter()).notifyDataSetChanged();
                if(EfficientAdapter.saveState.get(position)=="selected"){
                    EfficientAdapter.saveState.put(position,"unselected");
                }else
                EfficientAdapter.saveState.put(position,"selected");  
                mHandler.postDelayed(new Runnable() {

                    @Override
                    public void run() {
                        // call any new activity here or do any thing you want here         

                    }
               }, 200L);
            }
        });

        listView.setAdapter(new EfficientAdapter(getApplicationContext()));   
    }

    private static class EfficientAdapter extends BaseAdapter {
        private LayoutInflater mInflater;
        static HashMap<Integer,String> saveState=new HashMap<Integer,String>();

        public EfficientAdapter(Context context) {
            mInflater = LayoutInflater.from(context);
            for(int i=0;i<data.size();i++)
            {
               saveState.put(i,"unselected");
            }

        }

        public int getCount() {
            return data.size();
        }

        public Object getItem(int position) {
            return position;
        }

        public long getItemId(int position) {
            return position;
        }

        public View getView(int position, View convertView, ViewGroup parent) {

            ViewHolder holder;

            if (convertView == null || convertView.getTag() == null) {
                convertView = mInflater.inflate(R.layout.places_custom_row_view, null);
                holder = new ViewHolder();

                holder.txtName = (TextView) convertView
                    .findViewById(R.id.name);

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


            if(saveState.get(position).equals("selected"))
                holder.txtName.setBackgroundResource(R.drawable.cellbghover);  

             else
                holder.txtName.setBackgroundResource(R.drawable.cellbgnew);

            holder.txtName.setText(data.get(position)); 

            return convertView;
        }
    }

    static class ViewHolder {
        TextView txtName;
    }

    public void listfunction(View button) {
        System.out.println("listfunction items are::::"+selectedListItem);

    }
    }

Answer 1

自定义列表视图应该有自定义适配器。在自定义适配器中，您可以找到名为getView（）的方法以及视图，位置和父组。当您尝试单击事件时，position将表示当前所选项目的索引。

public class MyArrayAdapter extends ArrayAdapter<String> {
    @Override
    public View getView(final int position, View convertView,ViewGroup parent) {
            }
}

Answer 2

使用全局数组存储使用以下内容在列表视图中单击或触摸的所有项目的索引：

listview.setOnItemClickListener(
  new AdapterView.OnItemClickListener() {
    public void onItemClick(AdapterView<?> p, View view, int position,long id) {}
  }
);

其中position将是从0开始的项目的索引。然后单击按钮使用数组来检索单击的项目的位置

单击按钮时如何从列表视图中获取所选项目

2 个答案: