Applications made using Android Studio

I am starting to make some applications for Android cell phones using Android Studio. The software was written in JavaScript or Kotlin. I find it very interesting. Here are the two applications I have done, one is for learning the first 80 Kanjis and the other one is for a restaurant. They are very simple but were made in different languages and using different models. Making them using different contexts and structures helps to learn the software. Here are the videos of the applications working.

Here are the principal parts of the Kanji application. It is explained in Portuguese. The first part shows all the 80 Kanjis of the application and the lower button gives and explanation of the meaning of the Kanji chosen. It shows the ON pronunciation (Chinese), the KUN pronunciation (Japanese) and the meaning. Later 5 words that uses that Kanji are shown with its pronunciation and meaning. The Kanji meaning refers to general concepts ideas, for example the Kanji "木" refers to a tree but the word "木造", where that Kanji is used, refers to things made of wood.

There are also 2 buttons one to hide the content of the pronunciation and meaning of the Kanji and its examples and another to show. This can help to learn them.

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Some of the background pictures are related to the meaning of the Kanji, like "man" below to the left and "mountain" below to the right.

Some background pictures are from the Edo period of Japan.

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Here is how the Kanji for mountain will look after the pronunciation and meanings of the Kanji are hidden.

The purpose of this application is to help Brazilians who would like to work or study in Japan, like I did under the Monbusho scholarship. Most online applications to learn Kanjis are explained in English and most Brazilians do not speak English, so I made this application in Portuguese to help them learn these basic Kanjis.

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The other application, for a restaurant, was made for some friends who had to close their restaurant,due to the corona virus,and work by delivery, to promote their business.

There are been many hackers that stole date that is why various types of data encryption appeared. In the video below I describe how the AES encryption works. It was made for a Portuguese course of the Fatec.