[android-developers] HelloEffects confusion

I'm looking at the HelloEffects sample, and I'm very confused.

There is this line of code:

 GLES20.glUniform1i(mTexSamplerHandle, 0);

I would think it should be:

 GLES20.glUniform1i(mTexSamplerHandle, texId);

But that doesn't work.

Can someone help me understand this line?

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