setVisibility //// visible, invisible

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사이트 참고

onclick에서
RelativeLayout layout1, layout2, layout3;
 
oncreate에서 
layout1 = (RelativeLayout) findViewById(R.id.layout1);
 
if문 안에서
layout1.setVisibility(View.VISIBLE);
            layout2.setVisibility(View.INVISIBLE);
            layout3.setVisibility(View.INVISIBLE);
 
xml에서는
</RelativeLayout>
 
    <RelativeLayout
        android:id="@+id/layout2"
        android:visibility="invisible"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/button1"
        android:background="#00FA9A">
 
        <TextView
            android:id="@+id/txt2"
            android:layout_width="150dp"
            android:layout_height="50dp"
            android:layout_alignParentBottom="true"
            android:text="TextView"
            android:textSize="30dp" />