how to align parent bottom in android linear layout?

Question

I have a linearlayout

and I want to create at the bottom of it a slice.

I know there are some options, but I'm a bit confused

1) android:layout_gravity:"bottom" --> this doesn't work for me for some reason.

2) android:gravity_weight="0" and give the sibling before it android:gravity_weight:"1"

3) android:height="wrap_content" and give the sibling before it android:height:"match_parent"

I know how to do this using relativeLayout, but I want to practice linearLayout

what would you suggest?

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/blue_bg"
    android:orientation="vertical" >

   <ImageView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:layout_marginTop="5dp"
        android:src="@drawable/signup_illu_why" />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight=""
        android:orientation="horizontal" />

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:src="@drawable/signup_skip_icon" />

</LinearLayout>

Answer 1

<LinearLayout
    android:orientation="vertical"
                              ... >

    <Space
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <SomeViewThatNeedsGoBottom
                             ... />

</LinearLayout>

Answer 2

Actually, you can set the parent element's gravity to bottom

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/blue_bg"
    android:orientation="vertical"
    android:gravity="bottom" >

   <ImageView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:layout_marginTop="5dp"
        android:src="@drawable/signup_illu_why" />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight=""
        android:orientation="horizontal" />

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:src="@drawable/signup_skip_icon" />

</LinearLayout>