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What difference with Android when iOS is not open?

- by hqt

My question may seem silly, but, I've read in many Android books that the better part of Android is Android is open, and iOS is closed. But, from a programmer viewpoint, who cares about this point? Programmers just care about the platform: is it easy to program in, easy to have help in the network, etc. They don't care about whether the platform is open or closed. One book had additional information, but I don't understand it much. Since iOS is not open, I’d be able to share my work with others only if Apple allowed it. So, if you write an app, and need to share, you must have Apple's permission, but not Android's? Please help me understand this point. I'm preparing for a presentation on Android. And I don't know if I should put this point into my presentation.

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Tetris : Effective rotation

- by hqt

I rotate each piece by rotation formula. More detail, because rotation angle is 90 so : xNew = y; yNew = -x; But my method has met two problems : 1) Out of box : each type of pieces is fit in square 4x4. (0,0 at under left) But by this rotation, at some case they will out of this box. For example, there is a point with coordinate (5,6) So, please help me how to fit these coordinate into 4x4 box again, or give me another formula for this. 2) at I case : (4 squares at same row or same column), just has two rotations case. but in method above, they still has 4 pieces. So, how to prevent this. Thanks :)

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Config Apache HTTP Server for Eclipse

- by hqt

Maybe this question is silly but I really don't know how to solve. First, as other server, I want to define new server. So, in Eclipse, I go to: WindowsPreferenceServer: 1) When I add new server, in list, no category for apache HTTP server. Just has apache tomcat. So, I click into download additional server adapter--still don't have in list. 2) So, I search. I point to location I have installed. Good, Eclipse sees that is a HTTP Server. And Eclipse see folder to put project into for me (because I use LAMPP so that folder isn't in Apache folder). But here is my problem. When I want to run a new PHP Project. Right click, run on server. A new dialog appear take me to choose which server to run. And, in list of server, no HTTP Server, So, I don't know how to choose Apache HTTP Server !!! (because Eclipse doesn't see which server that I have defined, eclipse just find adapter first) So, if I want to run this project, I must copy all and paste to apache folder. Too handy !!! Please help me. Thanks :)

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Javascript: How to test JSONP on localhost

- by hqt

Here is the way I test JSONP: I run XAMPP, and in folder htdocs I create a javascript folder . I create json1.json file contain some data to process. After that, I run this html file locally, and it will call a function in "other machine" (in this case is localhost) Here is my code : <head> <script> function updateSales(sales) { alert('test jsonp'); // real code here } </script> </head> <body> <h1>JSONP Example</h1> <script src="http://localhost:85/javascript/json1.json?callback=updateSales"></script> </body> But when I run, nothing happen. But if change to other real json on the internet, it will work. It means change line : <script src="http://localhost:85/javascript/json1.json?callback=updateSales"></script> to line: <script src="http://gumball.wickedlysmart.com/?callback=updateSales"></script> It will work smoothly. So, I don't know how to test JSONP by using localhost, please help me. Thanks :)

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Ruby: how to know depth of multidemensional array

- by hqt

This is my problem I have met in my assignment. Array A has two elements: array B and array C. Array B has two elements: array D and array E At some point, array X just contains two elements: string a and string b. I don't know how to determine how deep array A is. For example: arrA = [ [ [1,2] ] ] I have tested by: A[0][0][0] == nil which returns false. Moreover, A[0][0]..[0] == nil always returns false. So, I cannot do this way to know how deep array A is.

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