Android RadioButtons control the color of a textview

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http://stackoverflow.com – i'm new to android programming and i'm making a program that changes the color of the textview item when you press one of the three radio buttons.each radiobutton corresponds to some specific color. the code compiles and doesn't give any errors , but it doesn't execute. this is the code package org.example.project2; import android.os.Bundle; import android.view.View; import android.app.Activity; import android.view.Menu; import android.widget.RadioButton; import android.widget.EditText; //import android.view.View.OnClickListener; import android.graphics.Color; public class MainActivity extend (HowTos)