selector

I am trying to make a button with a selector my button can have the following states: Enabled/Disabled Pressed/Not Pressed According to the states mentioned above. I need to manipulate the button's: Text color background image The button starts off my being disabled so it should have the disabled textColor and the disabled button background. But I can see the default textColor (specified in style) and NO background image! Here is my selector button_selector.xml <?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state

import java.io.IOException; import java.net.InetAddress; import java.net.InetSocketAddress; import java.net.Socket; import java.net.SocketAddress; import java.nio.ByteBuffer; import java.nio.channels.SelectionKey; import java.nio.channels.Selector; import java.nio.channels.ServerSocketChannel; import java.nio.channels.SocketChannel; import java.util.*; public class EchoServer { private InetAddress addr; private int port; private Selector selector; private Map<SocketChannel,List<byte[]>> dataMap; public EchoServer(InetAddress addr, int port) throws IOException { this.addr = addr; this.port =

I need help understanding $(this). Is it possible to narrow the focus of 'this' within the parentheses or does "this" preclude the use of any other attributes? For example: I don't understand why this code: $(this).children("div") can't be rewritten like this: $(this +" div") without having to resort to something like: $('#'+$(this).attr("id")+" div") Also, can you point me to 'this' in the JQuery documentation? It is difficult to use 'this' as a search term for obvious reasons. this isn't a jQuery "thing", but a basic JavaScript one . It can't be re-written the way you have in examples

How can I pass a parameter to the method called by a NSTimer? My timer looks like this: [NSTimer scheduledTimerWithTimeInterval:4 target:self selector:@selector(updateBusLocation) userInfo:nil repeats:YES]; and I want to be able to pass a string to the method updateBusLocation. Also, where am supposed to define the method updateBusLocation? In the same .m file that I create the timer? EDIT: Actually I am still having problems. I am getting the error message: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: ' * -[MapKitDisplayViewController updateBusLocation]:

First, I'm not sure I really understand what a selector is. From my understanding, it's the name of a method, and you can assign it to a class of type 'SEL' and then run methods such as respondToSelector to see if the receiver implements that method. Can someone offer up a better explanation? Secondly, to this point, I have the following code: NSString *thing = @"Hello, this is Craig"; SEL sel = @selector(lowercaseString:); NSString *lower = (([thing respondsToSelector:sel]) ? @"YES" : @"NO"); NSLog (@"Responds to lowercaseString: %@", lower); if ([thing respondsToSelector:sel]) //(lower == @

I feel like this is kind of a silly question, but here I go anyways. I have an image button, and I want to be able to change it's image everytime it is clicked. The API seems to say that the best way to go about doing this is to create xml resource in the drawable folder that contains a selector and values. However when I go to make a new android xml resource, there's no option for drawables. What am I missing? As far as I know, the Android XML editor doesn't allow you to create XML drawables. You have to go to the source tab (labeled: filename.xml) and paste in the text manually. It should