I'm trying to develop a help screen for the first launch of an application. To do that work on all size of device, I have done a 9patch file (Don't look at the design it's totally raw. I just want to make a proof of concept for the designer)

![enter image description here](https://i.stack.imgur.com/W6OFJ.png)

As you can see, I want to repeat (according the screen size) the left space vertically and the space between "Swipe to" and "you have done" horizontally.

I've put my png in the hdpi folder and my activity contains the following resource layout:

```
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/helper"
        android:scaleType="fitXY" />
</RelativeLayout>

```

Here is the result with a picture 720px large:
![720px](https://i.stack.imgur.com/h3Nao.png)

Here is the result with a picture 480px large:
![480px portrait](https://i.stack.imgur.com/W6OFJ.png)
![480px landscape](https://i.stack.imgur.com/RYD6W.png)

Here is the result with a picture 240px large:
![240px portrait](https://i.stack.imgur.com/pKl4U.png)
![240px landscape](https://i.stack.imgur.com/IvquL.png)

I think I have to play with a good dimension and ldpi/mdpi/hdpi/xhdpi folder and maybe also with derivated ldpi-landscap/mdpi-landscape.... 

Is there a way to do it right ? What dimension should my image have ?

Thanks in advance !