Question

编辑：我认为该帖子正在变得混乱所有这些编辑。我将尝试从一开始就解释这个问题。

我有一个带有ListView的活动和一个添加新项目的按钮。列表视图中的每个项目都由EditText和两个按钮进行竞争。问题是如果我添加一个新项目，那么EditTexts中的文本将恢复到它们的初始值......

我正在添加新项目：

adapter.add(new Contacto(""));
adapter.notifyDataSetChanged();

“Contacto”是我在arrayList中使用的类的名称。

@Iftikar Urrhman Khan建议我使用addTextChangedListener，但我不知道如何。

这是我的惯例的代码：

import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.provider.ContactsContract;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;

public class ContactsArrayAdapter extends ArrayAdapter<Contacto>{

    private ArrayList<Contacto> contactos;
    private Activity activity;

    public ContactsArrayAdapter(Activity a, int textViewResourceId, ArrayList<Contacto> contactos) {
        super(a, textViewResourceId, contactos);
        this.contactos = contactos;
        this.activity = a;
    }

    public static class ViewHolder{
        public EditText mail;
        public Button btn_contactos;
        public Button btn_delete;
    }

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

        View v = convertView;
        ViewHolder holder;

        final Contacto item = contactos.get(position);

        if (v == null) {
            LayoutInflater vi =
                (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = vi.inflate(R.layout.contacto, null);
            holder = new ViewHolder();
            holder.mail = (EditText) v.findViewById(R.id.txt_to);
            holder.btn_contactos = (Button) v.findViewById(R.id.btn_contacts);
            holder.btn_delete = (Button) v.findViewById(R.id.btn_delete);            
            v.setTag(holder);

            //Delete;
            holder.btn_delete.setTag(position);
            holder.btn_delete.setOnClickListener(new OnClickListener(){
                @Override
                public void onClick(View v){
                    int posicion = (Integer)v.getTag();
                    contactos.remove(posicion);
                    notifyDataSetChanged();
                }
            });

            //Add contacts
            holder.btn_contactos.setTag(position);
            holder.btn_contactos.setOnClickListener(new OnClickListener(){
                @Override
                public void onClick(View v){
                    //Log.d("TAG", "Botón contactos pulsado, pos: "+Integer.toString(pos));
                    ((Contactos)getContext()).setPosicion((Integer)v.getTag());

                    Intent intent =new Intent(Intent.ACTION_PICK,ContactsContract.CommonDataKinds.Email.CONTENT_URI);
                    ((Activity) v.getContext()).startActivityForResult(intent, MainActivity.act_pick_contact_mail);
                }
            });    

            //TextEdit Listener 
            holder.mail.addTextChangedListener(new TextWatcher(){
            @Override
            public void afterTextChanged(Editable arg0) {

                //holder.mail.setText(item.mail);
                //item.mail=arg0.toString();

                //int posi = (Integer)v.getTag();
                //contactos.set(posi, new Contacto(arg0.toString()));

                //contactos.get(pos).setMail(arg0.toString());

            }
            @Override
            public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {

            }
            @Override
            public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {

            }           
            });

        }
        else holder=(ViewHolder)v.getTag();

        holder.mail.setTag(position);

        if (item != null) {
            holder.mail.setText(item.getMail());
        }

        return v;
    }
}

Answer 1

问题出现在您的代码中，当editText值更改为未在arraylist contactos中更新时。

当您向数组列表中再添加一个项目时，它具有相同的旧值。

您可以将addTextChangedListener添加到您的编辑文字

holder.mail.addTextChangedListener(new TextWatcher(){
@Override
public void afterTextChanged(Editable arg0) {

}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {


}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {

}});

向ListView添加新项目：无法修改内容

1 个答案: