Listview与CursorAdapter

Question

我正在开发一个用CursorAdapter显示Phone联系人的应用程序.当我运行它时,我面对一个列表视图,它只重复了一个联系人("david"是我的一个联系人,只是在listview中重复)

大卫017224860

大卫017224860

大卫017224860

大卫017224860

大卫017224860

大卫017224860.

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我的活动看起来像

public class Contacts extends Activity {    
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.contacts);

    Cursor cursor = getContentResolver()
        .query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
               null, null, null, null);

    startManagingCursor(cursor);

    ContactCursorAdapterCT adapter= new ContactCursorAdapterCT(Contacts.this, cursor);
     ListView contactLV = (ListView) findViewById(R.id.listviewblcontactsDB);

    contactLV.setAdapter(adapter);

我的cursorAdapter看起来像:

public class ContactCursorAdapterCT extends CursorAdapter {
       public ContactCursorAdapterCT(Context context, Cursor c) {
    super(context, c);
    // TODO Auto-generated constructor stub
}

@Override
public void bindView(View view, Context context, Cursor cursor) {

    while (cursor.moveToNext()) {

        TextView name = (TextView)view.findViewById(R.id.blacklistDB1);               
          name.setText(cursor.getString(cursor.getColumnIndex
          (ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME)));

        TextView phone = (TextView)view.findViewById(R.id.blacklistDB2); 
          phone.setText(cursor.getString(cursor.getColumnIndex
          (ContactsContract.CommonDataKinds.Phone.NUMBER)));

    }
}

@Override
public View newView(Context context, Cursor cursor, ViewGroup parent)
{
    // TODO Auto-generated method stub

    LayoutInflater inflater = LayoutInflater.from(context);

    View v = inflater.inflate(R.layout.lv, parent, false);
            bindView(v, context, cursor);
           return v;
}

Answer 1

我注意到几点:

1. CursorAdapter为您移动光标,取出您的呼叫cursor.moveToNext().
2. 适配器的getView()调用newView()和bindView()它自己的调用; 你不应该自己调用这些方法.
3. 您应该在Google IO上观看Android开发人员的讲座,以了解有关加速适配器的提示和技巧.提示如下:
   • 使用ViewHolder,而不是findViewById()重复调用.
   • 保存Cursor的索引,而不是getColumnIndex()重复调用.
   • 获取LayoutInflater一次并保留本地引用.