Scale image-views to different devices – Photoshop

I create a view with an image-view at the top of the view.
The images are in size 1080-800px. If I take a look on my HTC One, it is perfekt. The image width takes the whole-screen. If I take another device , which is bigger or shorter , the images are to small or to big! I put the images to the drawable-xxhdpi folder.
Should I scale them with photoshop to different sizes?

You can see, the size at the left is perfekt, but how I can handle bigger devices like that one on the right side?

Code:

<?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:orientation="vertical" 
android:id="@+id/layout">

<TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Crunch"
    android:textAppearance="?android:attr/textAppearanceLarge" />

<ScrollView
            android:id="@+id/scrollView1"
            android:layout_width="wrap_content"
            android:layout_height="match_parent" >

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



<HorizontalScrollView
    android:id="@+id/horizontalScrollView1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal" >




            <ImageView
    android:id="@+id/imageView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/crunch1" />

<ImageView
    android:id="@+id/imageView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/crunch2" />

    </LinearLayout>
</HorizontalScrollView>

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/crunch" />



<TextView
    android:id="@+id/TVTimer"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="" />

 <Button
    android:id="@+id/pause"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:onClick="verlaufKlick"
    android:text="@string/pause"
    android:visibility="invisible"
      />

</LinearLayout>
        </ScrollView>

 </LinearLayout>