Android的与MatrixCursor的listView不更新 - futureTask

Question

我正在写一个简单的xmpp客户端在android和我有一个更新问题contactList。我使用MatrixCursor与SimpleCursorAdapter来做到这一点。当编更新列表时，它启动futureTask的线程。数据是好的，但屏幕上的列表不刷新，因为（我认为）这个futureTask的线程正在等待执行？

drawContactList当任何联系人更改状态时，从一个监听器调用方法。例如，当我将呼叫复制到main时，它可以很好地工作。

任何想法如何解决它？

代码：

static ListView contactList; 
static MatrixCursor clCursor; 
static SimpleCursorAdapter adapterList; 

private final String[] matrixCols = new String[] { "_id", "username", "description", "icon" }; 
private final String[] menuCols = new String[] {"username", "description", "icon" }; 
private final int[] toWhatId = new int[] { R.id.clUsername, R.id.clDescription, R.id.clStatusIcon }; 

... 
public void drawContactList(ArrayList<Contact> contacts, Context context) { 

    clCursor = new MatrixCursor(matrixCols); 

    startManagingCursor(clCursor); 
    if(contacts != null){ 
     for (Contact contact : contacts) {   
      clCursor.addRow(new Object[] { contact.id, contact.name, contact.description, contact.icon }); 
     } 
    } 
    adapterList = new SimpleCursorAdapter(getApplicationContext(), R.layout.contactlist, clCursor, menuCols, toWhatId); 
    //in this line futureTask starts 

    contactList.setAdapter(adapterList); 
} 

Answer 1

我找到了解决办法。我使用Handler来调用这个方法。它完美的作品:)

private Handler contactListHandler = new Handler(); 

contactListHandler.post(new Runnable() { 
    public void run() { 
     System.out.println("Presence changed: " + presence.getFrom() + " " + presence); 
     drawContactList(xmppConnection.updateContacts(presence), context); 
    } 
});