Question

我想使用OnItemLongClickListener从ListView中删除一个项目这是我在OnLongClick项目时出现AlertDialog的代码我还需要在删除项目时使用哪些代码

public class DeleteItem extends Activity {

 ListView list;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

        list = (ListView) findViewById(R.id.listView);
        list.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {

            @Override
            public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
                    int arg2, long arg3) {
                AlertDialog.Builder alert = new AlertDialog.Builder(DeleteItem.this);
                alert.setMessage("Are you sure you want to delete this?");
                alert.setCancelable(false);
                alert.setPositiveButton("Yes", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        //Here I need the delete code
                    }
                });
                alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.cancel();

                    }
                });


                return false;

            }
        });

       }
    }

Answer 1

ArrayAdapter的方法为remove(int index)：

list.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {

        @Override
        public boolean onItemLongClick(final AdapterView<?> arg0, View arg1,
                final int position, long arg3) {
            AlertDialog.Builder alert = new AlertDialog.Builder(DeleteItem.this);
            alert.setMessage("Are you sure you want to delete this?");
            alert.setCancelable(false);
            alert.setPositiveButton("Yes", new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int which) {
                    ArrayAdapter yourArrayAdapter = (ArrayAdapter) arg0.getAdapter();
                    yourArrayAdapter.remove(position);
                    yourArrayAdapter.notifyDataSetChanged();
                }
            });
            alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();

                }
            });


            return false;

        }
    });

使用适配器的通用类型调整强制转换。仅当您向适配器提供元素集合时，它才有效。如果你提供了一个数组，它将抛出异常

使用OnItemLongClickListener删除项目

1 个答案: