Left aligning images in LinearLayout using gravity or linear
First off, this is not a duplicate question , to best of my ability I've tried all (there are many) similar questions. Solutions to such problems appear to be very subjective, specific to a given scenario.
My layout currently appears as follows. Black boxes are images (logo and body, respectively), colours represent each layout:

My XML:
<?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="#000"
    android:padding="0px"
    android:layout_margin="0px"
    android:orientation="vertical">
    <LinearLayout
        android:layout_weight="16"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#FFF"
        android:gravity="top|center"
        android:orientation="horizontal">
        <ImageView
            android:id="@+id/logo"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:src="@drawable/logo"
            android:layout_gravity="top|center" />
    </LinearLayout>
    <LinearLayout
        android:layout_weight="4"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#00F"
        android:gravity="bottom|left"
        android:orientation="vertical">
        <ImageView
            android:id="@+id/body"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:src="@drawable/body"
            android:layout_gravity="bottom|left" />
    </LinearLayout>
</LinearLayout>
Here you can see I have a parent linear layout, split into two children linear layouts. This is because I need the images to be positioned differently within that part of the page.
In a nutshell, I need logo to be vertically aligned to the top, and body horizontally aligned to bottom-left.
Now, a few things that I've tried:
RelativeLayout rather than Linear  gravity with layout_gravity for both LinearLayout and ImageView, along with combinations of excluding each  match_parent for width and height is what I want, but I have tried different combinations with wrap_content  What I've come to understand:
gravity:top requires the parent view use orientation:horizontal  gravity:left requires the parent view use orientation:vertical  gravity applies to the children of the view  linear_gravity applies how the child aligns with it's parent  gravity on the parent and linear_gravity on the child might have the same effect (when using one instead of the other)?  Hopefully this is enough information. I'm having a very difficult time wrapping my head around how these layouts work.
Thank you SO much for the help!
 I think your problem is you are setting dimensions of the image views to match_parent .  I would use a RelativeLayout as it seems to be the most efficient in your case (pseudo-XML-code):  
RelativeLayout (width=match_parent, height=match_parent)
  ImageView (width=wrap_content, height=wrap_content, 
             alignParentTop=true, centerHorizontal=true)
  ImageView (width=wrap_content, height=wrap_content, 
             alignParentBottom=true, alignParentLeft=true)
You don't need any gravity setting here. You might want to play with the scaleType attribute depending on your image sizes.
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