How to put button abover other and at the bottom android?

Question

I would like to know how to put my three buttons at the bottom in the right order. Actually the three buttons are aligned but at the top.

Here is my xml code:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="fill_parent"
android:layout_height="fill_parent" 
tools:context="com.example.siansa.MainActivity"
tools:ignore="MergeRootFrame">

<Button
    android:id="@+id/button1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom"
    android:background="@color/blue"
    android:text="@string/connexion"
    android:textColor="@color/white" />

<Button
    android:id="@+id/button2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/red"
    android:layout_gravity="bottom"
    android:text="@string/inscription"
    android:textColor="@color/white" />

    <Button
    android:id="@+id/button3"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/gold"
    android:text="@string/guest"
               android:layout_gravity="bottom"
    android:textColor="@color/white" />

Answer 1

Did you try this in your XML?

android:layout_above="@+id/button"
android:layout_below="@+id/button"
android:layout_toLeftOf="@+id/button"
android:layout_toRightOf="@+id/button" 

Edit:

Or try:

android:layout_alignParentTop="true"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"