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Android resize custom dialog dim / blur background

public class customDialog extends Dialog{
...

public customDialog(Context context) {
	super(context,android.R.style.Theme_Translucent_NoTitleBar);

	WindowManager.LayoutParams lp=getWindow().getAttributes();
	//set transparency of background
	lp.dimAmount=0.6f;  // dimAmount between 0.0f and 1.0f, 1.0f is completely dark
	lp.width = 200; 
	lp.height =  300; 
	getWindow().setAttributes(lp);
	getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND); 
    }
}
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