如何刷新Android的ListView的UI界面
一般地，正确的自动更新UI界面的方式是通过自动更新Cursor，而实现自动更新Cursor，则是在创建Cursor和和被请求处理之前先调用 Cursor#setNotificationUri，然后在更新Cursor的Uri namespace变化的时候调用ContentResolver#notifyChange。这样就实现了自动更新UI界面，而这些全部都可以在ContentProvider完成。
For example, suppose you were creating a simple mail application and you wanted to update when new mail arrived but also provide various views on the mail. I'd have some basic Uri's defined.
content://org.example/all_mail
content://org.example/labels
content://org.example/messages
Now, say I wanted to get a cursor that gave me all mail and be updated when new mail arrives:
Cursor c;
//code to get data
c.setNotificationUri(getContentResolver(), Uri.parse("content://org.example/all_mail");
Now new mail arrives so I notify:
//Do stuff to store in database
getContentResolver().notifyChange(Uri.parse("content://org.example/all_mail", null);
I should also notify all the Cursors that selected for labels this new message met
for(String label : message.getLabels() {
getContentResolver().notifyChange(Uri.parse("content://org.example/lables/" + label, null);
}
And also, maybe a cursor is viewing that one specific message so notify them as well:
getContentResolver().notifyChange(Uri.parse("content://org.example/messages/" + message.getMessageId(), null);
The getContentResolver() calls happen where the data is accessed. So if it's in a Service or ContentProvider that is where you setNotificationUri and notifyChange. You should not be doing that from where the data is accessed, e.g., an Activity.