App stops working when adding image to imageButton

I am trying to make an scrollview with some imageButtons.

If i create it with blank buttons it works great.

My xml is:

<RelativeLayout xmlns:android="http://ift.tt/nIICcg"
xmlns:tools="http://ift.tt/LrGmb4" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainScreen">


<HorizontalScrollView
    android:id="@+id/filtersScroll"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true">

    <LinearLayout
        android:id="@+id/filtersLayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <ImageButton
            android:id="@+id/filtro1"
            android:layout_width="64dp"
            android:layout_height="64dp"/>
        <ImageButton
            android:id="@+id/filtro2"
            android:layout_width="64dp"
            android:layout_height="64dp" />
        <ImageButton
            android:id="@+id/filtro3"
            android:layout_width="64dp"
            android:layout_height="64dp"/>
        <ImageButton
            android:id="@+id/filtro4"
            android:layout_width="64dp"
            android:layout_height="64dp"/>
        <ImageButton
            android:id="@+id/filtro5"
            android:layout_width="64dp"
            android:layout_height="64dp"/>
        <ImageButton
            android:id="@+id/filtro6"
            android:layout_width="64dp"
            android:layout_height="64dp"/>
        <ImageButton
            android:id="@+id/filtro7"
            android:layout_width="64dp"
            android:layout_height="64dp"/>
        <ImageButton
            android:id="@+id/filtro8"
            android:layout_width="64dp"
            android:layout_height="64dp"/>




    </LinearLayout>

</HorizontalScrollView>

And what i get is:

But when i add a picture to the drawable folder(don't know if it matters but the picture is 2000x2000) and add it to one of the imageButtons like so:

<ImageButton
            android:id="@+id/filtro1"
            android:layout_width="64dp"
            android:layout_height="64dp"
            android:scaleType="centerInside"
            android:src="@drawable/smiley" />

Not only i can't make the image resize to the size of the button, but the app also stops working as soon as i try to run it.

This is how the preview looks like:

What am i missing? Has it something to do with the size of the source picture? I mean, i just want it to resize to the size of the button and work.

Also, what happened to the other folders that used to be in drawable/ ? Now you don't have to separate the images according to their size?