Android ImageView shows image smaller than it is

at the beginning my imageview shows the right size of my image (90x90px). But when I am changing the image the imageview shows the image in another size (it still says my bitmap object is 90x90px large)

Before: http://ift.tt/1wcn55C

After: http://ift.tt/1G8T9Yn

XML:

<ImageView
        android:id="@+id/iv_icon"
        android:src="@drawable/siplaceholder"
        android:scaleType="fitXY"
        app:layout_row="0"
        app:layout_rowSpan="3"
        app:layout_column="0"/>

Code:

inputStream = getAssets().open("icons/" + "siplaceholder.jpg");
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
((ImageView) findViewById(R.id.iv_icon)).setImageBitmap(bitmap);

Please excuse my english but its not my native language.