About this app

COLS is a plenty of apps to promote and spread creations and ideas using code to rethinking science such as physics and mathematics etc. It adopts “ App Project +Opening Code” mode to make ideas true. To cure the sciencephobia, the most effective way is not calculating or writing the answer of questions in the textbooks, but constructing an environment of learning and promoting the culture of learning. Doing experiments is such a way. Unfortunately, in reality, there are a lot of restrictions including materials, workplace, conditions and funding if we want to do an experiment. Coding is a feasible and cheap way to overcome these limitations.
A great many education cases and creations have been created or invented for many years. Computer Aided Instrument(CAI) is the popular way being used by many educators, but the learner is programmed by it. In Prof. Seymour Papert’s book, The Children’s Machine says， we should not stop on the mode of CAI which is “drill and kill”. We should go on to PET(Progressive Education Technology). Transform the learning mode from Programmed to programming or coded to coding. His view is important to us today. The way needs one of the computer languages for people to grasp and practice. App Inventor(AI) is one of the languages. It makes learning language easier than before and having relations with the smart phone. If we want to transform the situation from programmed to programming , AI gives a possibility to us. Students or learners use computer and smart devices to solve their questions , not the programmed solution obliges learners get the instrument.

Convex Lens Imaging has two versions. The first is very simple which can be seen a prototype of the question . It contains three cases of imaging. The second is more complicated which is added more and more and modified from the first version. It contains a variable of focal length which has three types of imaging and has countless cases which can be described by formula and variables. It becomes smarter and smarter.
The screens can be read through the open source code. The course contains two key points. One is the variable for focal length and a formula behind. They makes finite cases to countless possible. The other is that traditional rectangular coordinate system transforms to AI’s rectangular coordinate system. The formula has tight relation with the two systems and traditional ones is easier to get the formula than the other. We should transform the formula from traditional form which the (0,0) point is in the central to the other form which the (0,0) point is on the left-top. The key points are clearly described to users through open source code and their descriptions.
The source code can be downloaded from download.csdn.net . The important points of solutions are pressed in an WeChat Public Account . We can select one of these versions of the solution by a list. Block or picture codes make it easier. The description to these codes is very important , because it may show the learners many secrects about the app that you can’t read directly from codes.
All suggestion are available. Please email colscodeopen@gmail.com.

New features

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App Permissions

Allows applications to open network sockets.
Allows applications to access information about networks.
Allows applications to access information about Wi-Fi networks.
Allows an application to read from external storage.
Allows an application to write to external storage.