android - Andengine fade in/out and alpha modifiers not working -

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i have problem andengine gles2.

i have code:

sprite black = new sprite(0,0, blackregion, this.getvertexbufferobjectmanager()); black.setsize(camera_width, camera_height);  black.registerentitymodifier(new alphamodifier(2, 0, 255));  mscene.attachchild(black);

so it's not working. nothing does...

what need do?

did set blend function properly? example:

sprite.setblendfunction(gl10.gl_src_alpha, gl10.gl_one_minus_src_alpha);

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