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>

Answer 3

You shall use the new size qualifiers for this. That's the best way. What you are doing is not wrong, but with so many different breed of devices it have become obsolete. Refer this