Access another view's content from another view

I have an activity with two view.One view has the buttons and the other is main view.I must disable buttons for some circumstances inside main view.I couldn't figure o开发者_开发百科ut how to do that.

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Button myBtn = (Button) ((MyActivity)getContext()).findViewById(R.id.mybtn);

I was calling this code inside constructor of my view.

That's why it's not working. Now it's working...