如何获取特定值的选定用户的列表视图数据？

Question

如何获取特定值android的所选用户的listview数据。 我有列表视图包含用户。我想选择用户从Arraylist获取其名称和电话。上面的代码告诉我如何获取列表中的数据结果和data.below代码从列表中获取数据。但它显示相同的电话号码对于每个选定的用户。我想这样做：

    final Query query = mRef.orderByChild("blood_Group").equalTo(bloodgrp);

    query.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

            Iterable<DataSnapshot> children = dataSnapshot.getChildren();
            for (DataSnapshot child : children) {

                User value = child.getValue(User.class);

                if(value.equals(city)){


                    data.add(value);

                    adapter.notifyDataSetChanged();

                }else {

                    Toast.makeText(Searchview.this,"Donors not found!",Toast.LENGTH_SHORT).show();

                }
            }
        }


        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });



above code tells how i got data in lists result and data.below code about getting data from lists.but it shows same phone number for every selected user.

    //List Listener

    listResult.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long l) {


           User user = adapter.getItem(position);
            String name = (String) parent.getItemAtPosition(position);



            final Dialog dialog = new Dialog(Searchview.this);


            dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
            dialog.setContentView(R.layout.activity_user_details);
            dialog.setTitle("Call Donor");

            //adding text dynamically

            TextView t1 = (TextView) dialog.findViewById(R.id.txtname);
            TextView t2 = (TextView) dialog.findViewById(R.id.txtBldtype);
            TextView t3 = (TextView) dialog.findViewById(R.id.txtphone);
            TextView t4 = (TextView) dialog.findViewById(R.id.txtcity);

            t1.setText(name);
            t2.setText(bloodgrp);
            t3.setText(phone);
            t4.setText(city);

现在新的错误是：   Error image

Answer 1

谢谢大家最终通过实现这一目标而解决。

query.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

            Iterable<DataSnapshot> children = dataSnapshot.getChildren();
            for (DataSnapshot child : children) {

                if (dataSnapshot.getValue() != null) {

                User value = child.getValue(User.class);

                if(value.getCity().equals(city)){


                    data.add(value);

                    adapter.notifyDataSetChanged();

                }

                }
            }
        }


        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });