Display a Button with visibility Gone Android -


i have linear layout 3 buttons, , linear layout overlays previous layout. need still show 1 of buttons first layout. how can achieve that? here code far: 

<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" >  <linearlayout     android:layout_width="match_parent"     android:layout_height="match_parent"     android:layout_gravity="center_vertical|center_horizontal|center"     android:layout_marginbottom="10dp"     android:layout_marginleft="85dp"     android:layout_marginright="85dp"     android:layout_margintop="20dp"     android:orientation="vertical"     android:padding="10dp"     android:screenorientation="portrait" >      <button         android:id="@+id/fire_help"         android:layout_width="match_parent"         android:layout_height="0dp"         android:layout_gravity="center_vertical|center_horizontal|center"         android:layout_marginbottom="30dp"         android:layout_weight="1"         android:background="@drawable/fire_help"         android:text="@string/fire_service"         android:textcolor="@color/white"         android:textstyle="bold" />      <button         android:id="@+id/police_help"         android:layout_width="match_parent"         android:layout_height="0dp"         android:layout_gravity="center_vertical|center_horizontal|center"         android:layout_marginbottom="30dp"         android:layout_weight="1"         android:background="@drawable/police_help"         android:text="@string/police_help"         android:textcolor="@color/white"         android:textstyle="bold" />      <button         android:id="@+id/medical_help"         android:layout_width="match_parent"         android:layout_height="0dp"         android:layout_gravity="center_vertical|center_horizontal|center"         android:layout_marginbottom="10dp"         android:layout_weight="1"         android:background="@drawable/medical_help"         android:padding="10dp"         android:text="@string/medical_help_description"         android:textcolor="@color/white"         android:textstyle="bold"         android:visibility="visible" >          <requestfocus />     </button> </linearlayout>  <linearlayout     android:id="@+id/overlay"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:background="@color/overlay_background"     android:clickable="true"     android:orientation="vertical"     android:screenorientation="portrait"     android:visibility="visible" >      <tablerow         android:id="@+id/textrow1"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:background="@color/overlay_text_background" >          <textview             android:id="@+id/test_mode"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:layout_gravity="center_vertical|center_horizontal"             android:gravity="center"             android:padding="20dp"             android:text="@string/test_mode"             android:textappearance="?android:attr/textappearancelarge"             android:textcolor="@color/white"             android:textsize="25sp"             android:textstyle="bold" />     </tablerow>      <tablerow         android:id="@+id/textrow2"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:background="@color/white" >          <textview             android:id="@+id/press_button_text"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:padding="20dp"             android:text="@string/press_button"             android:textappearance="?android:attr/textappearancelarge"             android:textsize="16sp"             android:textstyle="bold" />     </tablerow>      <relativelayout         android:id="@+id/overlay_button_layout"         android:layout_width="fill_parent"         android:layout_height="fill_parent"         android:layout_marginleft="65dp"         android:layout_marginright="65dp"         android:layout_margintop="160dp"         android:layout_marginbottom="20dp"         android:background="@drawable/white_background"         android:orientation="vertical"         android:padding="25dp" >          <button             android:id="@+id/overlay_medical_help"             android:layout_width="match_parent"             android:layout_height="match_parent"             android:background="@drawable/medical_help"             android:padding="10dp"             android:src="@drawable/medical_help"             android:text="@string/medical_help_description"             android:textcolor="@color/white"             android:textstyle="bold"             android:visibility="visible" >              <requestfocus />         </button>     </relativelayout> </linearlayout>

here how can programatically 

 view b = findviewbyid(r.id.button);  b.setvisibility(view.gone);

or in xml:

<button ...   android:visibility="gone"/>

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