[android-developers] How can i make my texture (or polygon) transparent when i want? (opengl es 1.1)

I have a square polygon with a texture (opengl es 1.1), and i need
that when i want the polygon get's invisible and when i want the
polygon turn's visible again.

It's frustrating because seems to be a very easy thing but i can't
find any tutorials or examples for do it on google or stackoverflow.

please, can someone give me a sample to do it?

thanks!

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