我正在尝试使用警告对话框动态地将项添加到列表适配器。该项目将添加到用于显示的列表中，但添加新项目时列表适配器不会更改。以下是我的一些代码：
public class ContactEdit extends Activity implements View.OnClickListener, OnItemSelectedListener
{
private Button btnAdd = null;
/**
* Used as a flag to indicate if the Activity is being used to create a new
* contact (0) or update an old contact (1).
*/
public static boolean isEdit = false;
/**
* The adapter that holds the contacts numbers
*/
public NumberListAdapter numberListAdapter;
/**
* A Contact containing all the details of the contact to be edited by this
* Activity
*/
private Contact contact = null;
/**
* This method creates the NewContact activity.
*
* @param i
* This Method gets passed the bundle to be created.
* @see android.app.Activity#onCreate(android.os.Bundle)
*/
@Override
public final void onCreate(final Bundle i)
{
// Used to temporarily store the nameID passed to this Activity when it
// is called to
// edit a contact.
isEdit = false;
try
{
super.onCreate(i);
this.setContentView(R.layout.contactedit);
// Add number button
this.btnAdd = (Button) findViewById(R.id.form_button);
this.btnAdd.setOnClickListener(ContactEdit.this);
final Bundle extras = this.getIntent().getExtras();
if (extras != null)
{
// sets value
contact = extras.getParcelable(BlackbookUtils.CONTACT);
final List<Number> contactNumbersList = contact.getNumbers();
ListView numberListView = (ListView) this.findViewById(R.id.numberListView);
numberListAdapter = new NumberListAdapter(this, R.layout.row, contactNumbersList);
numberListView.setAdapter(numberListAdapter);
isEdit = true;
}
Log.d(TAG, "new contact oncreate successful");
}
catch (Exception e)
{
Log.d(TAG, "newcontact oncreate failed");
e.printStackTrace();
}
}
/**
* This method sets the program to watch for any button or textbox to be
* pressed.
*
* @param view
* This is the current focused item, in this case a textbox.
* @see android.view.View.OnClickListener#onClick(android.view.View)
*/
public final void onClick(final View view) // change this to use new delim
// methods
{
try
{
if (view == btnAdd)
{
//TODO: Guard to check if it is a new contact
//Add number from the edit text to the list
if (!isEdit)
{
contact = new Contact();
numberListAdapter = new NumberListAdapter(this, R.layout.row, contact.getNumbers());
}
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("Contact edit");
alert.setMessage("Add a new number");
// Set an EditText view to get user input
final EditText input = new EditText(this);
alert.setView(input);
alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
Editable value = input.getText();
//TODO: This will notify there is a change in the list and reload it
Number tempNumber = new Number();
tempNumber.setphoneNumber(value.toString());
contact.getNumbers().add(tempNumber);
numberListAdapter.notifyDataSetChanged();
}
});
alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// Canceled.
}
});
alert.show();
}
}
}
}
catch (Exception e)
{
Log.d(TAG, "Names, Numbers and Emails failed to set ");
e.printStackTrace();
}
}
private static class NumberListAdapter extends ArrayAdapter<Number>
{
/**
* Used to create the initial views that populate the list.
*/
private LayoutInflater mInflater = null;
/**
* List of stations after the filter has been applied.
*/
public List<Number> filteredItems;
/**
* List of all stations.
*/
public ArrayList<Number> originalItems = new ArrayList<Number>();
/**
* Used to search the stations and update the list appropriately.
*/
private Filter filter;
public NumberListAdapter(Context context, int textViewResourceId,
List<Number> contactNumbersList) {
super(context, textViewResourceId, contactNumbersList);
// Cache the LayoutInflate to avoid asking for a new one each time.
mInflater = LayoutInflater.from(context);
// keep track of the list of provided Station objects and a copy for
// applying filters
this.filteredItems = contactNumbersList;
cloneItems(contactNumbersList);
}
protected void cloneItems(List<Number> contactNumbersList) {
for (Iterator<Number> iterator = contactNumbersList.iterator(); iterator
.hasNext();) {
Number s = (Number) iterator.next();
originalItems.add(s);
}
}
static class ViewHolder
{
TextView number;
//TODO: Will need to possibly assign function of this
Button deleteBTN;
}
/**
* Populates each row of the custom list with data
*/
/*
* (non-Javadoc)
* @see android.widget.ArrayAdapter#getView(int, android.view.View,
* android.view.ViewGroup)
*/
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
// this will hold onto the widgets associated with a particular list
// entry
ViewHolder holder;
if (convertView == null)
{
// if there's no views to recycle, inflate a new one
convertView = mInflater.inflate(R.layout.row, null);
// store the widgets in the holder
holder = new ViewHolder();
// holder.number = (TextView) convertView.findViewById(R.id.rowTextView);
// holder. = (Button) convertView.findViewById(R.id.rowButton);
holder.number = (TextView) convertView.findViewById(R.id.rowTextView);
holder.deleteBTN = (Button) convertView.findViewById(R.id.rowButton);
// tag the holder to the view so that they can be retrieved next
// time
convertView.setTag(holder);
}
else
{
// retrieved the tagged ViewHolder
holder = (ViewHolder) convertView.getTag();
}
// retrieve the current Station object
Number temp = filteredItems.get(position);
if (temp != null)
{
try
{
holder.number.setText(temp.getnumber());
}
catch (Exception e)
{
Log.d(TAG, "getView - failed");
e.printStackTrace();
}
}
return convertView;
}
}
}
感谢任何帮助。
答案 0 :(得分：1)
首先在onCreate时间设置
final List<Number> contactNumbersList = contact.getNumbers();
之后您没有将此联系人分配给contactNumbersList
此contactNumbersList已设置到您的适配器中，因此无论何时此更新都会像添加/删除一样，您可以收到通知
您需要创建此contactNumbersList声明为onCreate方法之外的联系对象，这样您可以在联系时将联系人值重新分配给此对象，然后添加此对象
contactNumbersList = contact.getNumbers();
numberListView.setAdapter(numberListAdapter);