Team Leader Android Developer Question:
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Explain me what is the difference between a regular .png and a nine-patch image?

Team Leader Android Developer Interview Question
Team Leader Android Developer Interview Question

Answer:

It is a resizable bitmap resource that can be used for backgrounds or other images on the device. NinePatch class permits drawing a bitmap in nine sections. The nine patch images have extension as.9.png. It allows extension in 9 ways, i.e. 4 corners that are unscaled, 4 edges that are scaled in 1 axis, and the middle one that can be scaled into both axes.

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