Now we’re going to define a Renderer so that we can start clearing the screen. Let’s take a quick overview of the methods defined by the Renderer interface:
GLSurfaceView calls this when the surface is created. This happens the first time our application is run, and it may also be called when the device wakes up or when the user switches back to our activity. In practice, this means that this method may be called multiple times while our application is running.
GLSurfaceView calls this after the surface is created and whenever the size has changed. A size change can occur when switching from portrait to landscape and ...
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