Percent Support Library – what, when, how?

What, when?

With the release of Android M (API 23) the Support library got a major update as well. One of the unsung heroes is a feature badly requested since Android’s early days – the ability to set dimensions in percentages. With the release of the Percent Support Library is’t now possible to set a View to take exactly 30% of the screen, or to set it’s marginTop to 10% for example.

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Basic Java: What Interfaces really are?

As an assistant of a course in basic Java in my local university, I saw a common misunderstanding among students what interfaces really are. In this short article I’ll try to give students another point of view.

As we all know “an interface is a group of related methods with empty bodies”*. Consider the following example:
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