Question

我需要阅读我的Android应用程序中的联系人列表，并使用多项选项向用户显示。我刚看到带有ListView.CHOICE_MODE_MULTIPLE的android示例，但我需要一些不同的东西，我想要一个custm布局。我需要向bot显示联系人的姓名和号码，以便我创建自己的适配器。首先，我创建了一个myown类来创建一个Contact：

 //Contacts class   
public class Contatto {


    private String nome; //The name
    private String numero;//number

    public String getNome(){ //Get Name
        return nome;
    }

    public String getNumero(){ //Get number
        return numero;
    }

    public void setNome(String n){ //Set name
        this.nome = n;
    }

    public void setNumero(String n){ //Set number
        this.numero = n;
    }

}

然后我使用一个cicle来获取所有contatcs使用一个线程来通知用户该应用程序正在运行...

import java.util.ArrayList;

import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Context;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class RecuperaRubrica extends ListActivity{


private ProgressDialog m_ProgressDialog = null;
private ArrayList<Contatto> arrayContatti = null;
private ContattoAdapter m_adapter;
private Runnable viewContatti;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.recupera_rubrica);

    arrayContatti = new ArrayList<Contatto>();
    this.m_adapter = new ContattoAdapter(this, R.layout.riga, arrayContatti);
    setListAdapter(this.m_adapter);

    viewContatti = new Runnable(){
        @Override
        public void run() {
            getContatti();
        }
    };
    Thread thread =  new Thread(null, viewContatti, "MagentoBackground");
    thread.start();
    m_ProgressDialog = ProgressDialog.show(RecuperaRubrica.this,    
          "ATTENDI...", "Recupero contatti in corso ...", true);
}
private Runnable returnRes = new Runnable() {

    @Override
    public void run() {
        if(arrayContatti != null && arrayContatti.size() > 0){
            m_adapter.notifyDataSetChanged();
            for(int i=0;i<arrayContatti.size();i++)
            m_adapter.add(arrayContatti.get(i));
        }
        m_ProgressDialog.dismiss();
        m_adapter.notifyDataSetChanged();
    }
};
private void getContatti(){
      try{
          arrayContatti = new ArrayList<Contatto>();
          Cursor cursor = getContentResolver().query(ContactsContract.Contacts.CONTENT_URI,null, null, null, null); //Cursore della rubrica
          while (cursor.moveToNext()) { //Entro nel ciclo se trovo almeno un contatto
              try{
                //Recupero tutte le info dell'utente corrente
              String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID)); 
              String name=cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
              String hasPhone = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER));

              //Se è disponibile almeno un numero di telefono lo recupero
              if (Integer.parseInt(hasPhone) > 0) {
                  Cursor phones = getContentResolver().query( ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = "+ contactId, null, null);
                  while (phones.moveToNext()) { 
                      String phoneNumber = phones.getString(phones.getColumnIndex( ContactsContract.CommonDataKinds.Phone.NUMBER));

                      phoneNumber = str_replace("-","",phoneNumber);
                      phoneNumber = str_replace("+39","",phoneNumber);

                      Contatto contatto = new Contatto();
                      contatto.setNome(name.trim());
                      contatto.setNumero(phoneNumber.trim());

                      if(!arrayContatti.contains(contatto)){
                          arrayContatti.add(contatto);
                      }
                  } 
                  phones.close(); //Chiudo la rubrica
              }
          }catch(Exception e){}
         }

        } catch (Exception e) {
          Log.e("BACKGROUND_PROC", e.getMessage());
        }
        runOnUiThread(returnRes);
    }
private class ContattoAdapter extends ArrayAdapter<Contatto> {

    private ArrayList<Contatto> items;

    public ContattoAdapter(Context context, int textViewResourceId, ArrayList<Contatto> items) {
            super(context, textViewResourceId, items);
            this.items = items;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
            View v = convertView;
            if (v == null) {
                LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                v = vi.inflate(R.layout.riga, null);
            }
            Contatto o = items.get(position);
            if (o != null) {
                    TextView tt = (TextView) v.findViewById(R.id.NomeElenco);
                    TextView bt = (TextView) v.findViewById(R.id.NumeroElenco);
                    if (tt != null) {
                          tt.setText(o.getNome());                            
                    }
                    if(bt != null){
                          bt.setText(o.getNumero());
                    }
            }
            return v;
    }
}

public String str_replace (String search, String replace, String subject)
{
  StringBuffer  result = new StringBuffer (subject);
  int  pos = 0;
  while (true)
  {
    pos = result.indexOf (search, pos);
    if (pos != -1)
      result.replace (pos, pos + search.length (), replace);
    else
      break;
  }
  return result.toString ();
}
}

这是简单的xml布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
>
    <ListView 
        android:id="@+id/android:list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
      ></ListView>  

</LinearLayout>

这项工作，但当我运行应用程序，如果我检查第一个结果然后滚动页面也检查新页面中的第一个结果等等...你能帮我理解为什么？

Answer 1

我之前遇到过这样的问题，下面就是我发现它的原因。

由于列表视图使用视图对象回收来节省内存，我们需要使用某种机制来存储每个列表项的选择状态，然后在get view方法中使用它来检查或取消选中（imp）选择时正在检索视图。

我希望它有所帮助

Android - 用于多选列表视图的自定义适配器

1 个答案: