Scale Images in Different Resolutions XML

Question

I have created 4 resolution folders and put the appropriate image sizes into each as seen in the picture below:

I have also created 8 different layout folders for various screen sizes as seen in the picture below:

As you can see in the picture below, I need to re-size the images in each according XML file so they fill the screen:

I use this code to scale down images which works fine:

android:adjustViewBounds="true"  
    android:maxWidth="150dp" 
    android:scaleType="fitCenter"

But I cannot figure out how to scale up images. I have been trying to use this code:

android:adjustViewBounds="true"  
    android:minWidth="150dp" 
    android:scaleType="fitCenter"

Any ideas on how to scale up the images? Thank you!!

XML:

    <ImageButton
    android:id="@+id/btnPlay"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_below="@+id/imageView1"
    android:layout_marginTop="15dp"
    android:background="@null"
    android:src="@drawable/btn_play"
    android:adjustViewBounds="true"  
    android:scaleX="1.5"
    android:scaleY="1.5"
    android:scaleType="fitXY"  />

Answer 1

Have you tried?:

android:scaleX="1.5" // 1 is 100% size
android:scaleY="1.5"

Answer 2

try android:scaleType="fitXY" instead of android:scaleType="fitCenter"

Edit

use LinearLayout with layout_weight and weightSum

like adjust WeighSum and layout_weight according to your UI !

 <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:weightSum="8" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="3" >

        <!-- your Match m Image -->
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="2"
        android:background="#fff" >

        <!-- your play image -->
    </LinearLayout>

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

        <!-- your Multiplayer image -->
    </LinearLayout>

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

        <!-- your High score Image -->
    </LinearLayout>

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

        <!-- your how to play Image -->
    </LinearLayout>
</LinearLayout>