Custom indeterminate progress bar

Question

I successfully have implemented this progress

Using animation-list with resources like this:

But problem is, that i can't impement half-heighted progress with this resources.

I have tried half-heighted resources with gravity centered vertically like this:

But the result was

Android pushed this progress to bottom. Any ideas how can I center my half-heited progress? Thx in advance.

@Antoine Marques I have tried nine-patch drawables, but i get somethink like this

And here is my animation-list:

<item android:duration="200" android:drawable="@drawable/progressbar_indeterminate1_0" />

And resource example:

Answer 1

The solution to your problem is wrapping your custom progress drawable inside a ScaleDrawable :

<scale xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/my_custom_progress"
    android:scaleGravity="center_vertical|center_horizontal"
    android:scaleHeight="100%"
    android:scaleWidth="100%" />