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I want to use libdx and box2d, what things I can simulate with box2d or libgdx and I need something that can be useful in everyday life, it can be on any platform thanks.
You can simulate the effect of gravity on objects having different shapes and mass. You could allow the user to place objects and make the user specify the shape, mass ans size. then the user can watch as gravity causes the shapes to move in interesting patterns.
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I'm looking an API for video and audio calling which is free and it can handle huge amount of user.
I have try ZegoCloud, VideoSDk, Agora.io all are paid after a certain limit.
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I am trying to implement a application to recognized human facial expressions(happiness,sadness,boring, etc,) then after automatically selecting a song which suitable for current emotion of the person, if he is sad system playing enjoyable song, how can i do this thing, if any API's already have? any examples for me?
According to my understanding，your core need is facial expression recognition.there is an API ready for you ,emotion API by Microsoft https://azure.microsoft.com/zh-cn/services/cognitive-services/emotion/.Which Can detect emotions including anger, contempt, disgust, fear, happiness, neutral, sadness and surprise. You can think of these emotions across cultural boundaries, usually by certain facial expressions.
example:you can refer to How-old, a popular APP which Can measure the characters of age and Gender through photos.the different is:it's a light application Supported by another Microsoft API(Project Oxford),But I think you can get some inspiration from it.
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I want to compare the 2 images(images of people)and want a result that these are of same person or not(By Face recognization).I have to do this for millions of images so I cannot do it manually .Is there any api for android that can be used in my app.
You could use Camera.Face or FaceDetector.Face class. Take parameters of face on both photos and compare their parameters using e.g. eyesDistance(). If those parameters quite the same -> its the same person.
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I am going to start a project on Markov Decision Processes and am starting up a basic framework to work in. The first thing I want to set up is a grid of n by n, with cells which are empty or occupied by some class of agents (lets say a monkey, banana and palm tree). I want to be able to visualize this with JAVA. But am actually hoping that I will not have to write the code from scratch, i.e. the visualization part.
So, a grid of n by n, with (possible) some word, picture or number in each cell. Any ideas on existing packages?
I think you can use a JTable
http://docs.oracle.com/javase/7/docs/api/javax/swing/JTable.html
http://docs.oracle.com/javase/tutorial/uiswing/components/table.html
Setting the appropiate TableCellRenderer you can display each cell the way you like.
The problem is that you have to write some code.
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How to create a event reminder. Example, an user created an event which is today 5.00pm and stored it into database. When ruun the program the reminder will pop up if the system time is 5.00pm. Is there any API can do that? From google what I got was those freeware.
Assuming you use Date to represent the time you want to fire the alert, schedule a custom Callable task in a ScheduledExecutorService.
Ths code would look like this:
myScheculer.schedule(alertTime.getTime() - System.currentTimeMillis(), new AlertTask());
In the AlertTask implementation, use JOptionPane.showMessage() to pop the notification.