overriding

问题 I have an imageView nested inside of a scrollView that allows me to view an image, pinch to zoom, and pan around if I am zoomed in enough. Using a custom GestureRecognizer, I have (per the request of the person I'm building this app for) overridden the default behavior of the one finger pan so that it does something other than pan. This works perfectly. Now the problem is that I still need the ability to pan around the image like I could with the one finger pan, I just need this to now be

问题 I'm trying to override the onBackPressed() method of the ActivityGroup class: public class MyClass extends ActivityGroup { @Override public void onBackPressed() { // do something return; } but I'm getting the error The method onBackPressed() of type MyClass must override a superclass method . I'm relatively new to Java, I've seen here that people do it and it works for them Why I'm getting this error? I'm writing an app for android 1.5, could the problem be here? 回答1: Edit You need to

问题 Follow up from This Question - In the Question class I have the following properties (I'm simplifying here) public class Question : IDisposable, IEquatable<Question>{ protected virtual DataRow Row{ get { return DataTable.Rows[0]; } } public string Value { get { return this.Row.Field<string>("Value"); } } } now, for the SessionQuestion class I want to keep this in play, but I want to read the Value field from a different data table : public class SessionQuestion : Question, IEquatable

问题 I am trying to override the admin Sales Totals block (Mage_Adminhtml_Block_Sales_Totals) situated under "/app/code/core/Mage/Adminhtml/Block/Sales/Totals.php" I declare my module like this: <?xml version="1.0" encoding="UTF-8"?> <config> <modules> <CompanyName_Adminhtml> <version>0.1.0</version> </CompanyName_Adminhtml> </modules> <global> <blocks> <companyname_adminhtml> <class>CompanyName_Adminhtml_Block_Adminhtml_Sales_Totals</class> </companyname_adminhtml> <adminhtml> <rewrite> <sales

问题 In a XSD file, a want to define: a parent type (that contains 10 nodes). a 7 child types (each child type contains the same 10 nodes, but the type of the 2nd node is different). It can be done by defining the child types by restriction on the parent type (the parent type will be the base type for the child types). The problem: In child types, I have to write again all the nodes of the parent type (not only the 2nd node). The question: Can I write only the node that I'm overriding (the 2nd

问题 I want to write a category on UINavigationItem to make changes to barBackButtonItem across my entire app. From what I have been told in the comments here ( Change BackBarButtonItem for All UIViewControllers? ), I should "override backBarButtonItem in it, then your method will be called whenever their back bar button item is called for." - but how do I know what method to override? I have looked at the UINavigationItem documentation, and there are multiple methods used for initializing a

问题 This question already has answers here : How to override cout in C++? (9 answers) Closed 3 years ago . I already have a large code base that uses a lot of couts. I cannot go and change all the existing couts. Is there something I can do so that, the existing couts add FUNCTION , LINE and time information along with what needs to be printed in the cout? In otherwords can I override cout to use my implementationwhich will print the string along with all the extra information. I am open to doing

问题 I created a subclass of UITextField to override the method rightViewRectForBounds. Here is my custom class CustomTextField @interface CustomTextField : UITextField @end @implementation CustomTextField // override rightViewRectForBounds method: - (CGRect)rightViewRectForBounds:(CGRect)bounds{ NSLog(@"rightViewRectForBounds"); CGRect rightBounds = CGRectMake(bounds.origin.x + 10, 0, 30, 44); return rightBounds ; } @end Now I set up my ViewController to call the custom class instead of

问题 I have created a JList using GrazedLists, specifically an EventList which I then pass into a SeparatorList with a custom Comparator that sorts my EventList elements. I am using a DefaultEventListModel as the JList model, passing in my SeparatorList. And I am using a custom CellRenderer to decorate the SeparatorList.Separator cells. All is displaying nicely, I see a nicely formatted list grouped as I like, similar to optgroups in HTML SELECT elements. Now I would like to prevent selection of

问题 I would like to roughly monitor the progress of a file upload. I know that I can override the MultipartEntity and make the writeTo(OutputStream out) method write to a FilterOutputStream class that I created to wrap the default InputStream. For full details on how I did that, see my answer here. However, upon closer inspection this counts every byte sent twice! I went to the documentation to see what was up. Looks like FilterOutputStream's write(byte[], int, int) method simply calls the