android "layout_alignParentBottom" in relative layout

Question

So, I have this layout:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:id="@+id/layout"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:background="#FFFF00"
                android:minHeight="100dp"
                android:layout_gravity="bottom"
        >
    <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:textColor="#000000"
            android:background="#FF0000"
            android:text="Hello World"
            />

    <Button
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:layout_alignParentRight="true"
            android:text="button"/>
</RelativeLayout>

and this is how it looks:

but if I add android:layout_alignParentBottom="true" to the button here is how it looks:

1. Can someone please explain me this behavior?
2. How to put my button at the bottom without resizing the yellow layout and without adding thousand of layouts for workarounds?

Answer 1

this solution worked for me

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:id="@+id/layout"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:background="#FFFF00"
                android:minHeight="100dp"
                android:orientation="horizontal"
                android:layout_gravity="bottom"
        >
    <TextView
            android:id="@+id/tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:textColor="#000000"
            android:background="#FF0000"
            android:text="Hello World"
            />

    <Button
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:layout_gravity="bottom|right"
            android:text="button"/>
</FrameLayout>

Answer 2

this one fast one screen

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_gravity="bottom"
    android:background="#FFFF00"
    android:minHeight="100dp" >



    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:text="button" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignTop="@+id/button1"
        android:background="#000000"
        android:text="TextView" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/button1"
        android:layout_alignParentLeft="true"
        android:background="#000000"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:orientation="vertical" >

    </LinearLayout>

</RelativeLayout>