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Why are my custom button states not working?

I created custom images with 9 patches for the background of my button. The buttons are in the drawable-hdpi and drawable-mdpi folders. I created a custom selector file for button states.

Login_button.xml selector file:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- Image display in background in select state -->
    <item android:state_pressed="true" android:drawable="@drawable/login_button_down" />

    <!-- Image display in background in select state -->
    <item android:state_focused="true" android:drawable="@drawable/login_button_down" />

    <!-- Default state --> 
    <item android:drawable="@drawable/login_button" />
</selector>

Then I created my own styles.xml file for the button style:

<style name="login_button_style" parent="@android:style/Widget.Button">
        <item name="android:gravity">center_vertical|center_horizontal</item>
        <item name="android:textColor">#FF000000</item>
        <item name="android:shadowColor">#FFFFFFFF</item>
        <item name="android:shadowDx">0</item>
        <item name="android:shadowDy">1</item>
        <item name="android:shadowRadius">0.2</item>
        <item name="android:textSize">13dp</item>
        <item name="android:textStyle">bold</item>
        <item name="android:background">@drawable/login_button</item>
        <item name="android:focusable">true</item>
        <item name="android:clickable">true</item>
    </style>

Then applied this style to my theme file in topic.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="customTheme" parent="@android:style/Theme.NoTitleBar" >
        <item name="android:editTextStyle">@style/login_edittext_style</item>
        <item name="android:buttonStyle">@style/login_button_style</item>
        <item name="android:textViewStyle">@style/login_textview_style</item>
    </style>
</resources>

And finally, the button itself is added to the layout file:

<Button 
   android:text="@string/login_text" 
   android:id="@+id/buttonSignIn" 
   android:layout_width="130dp" 
   android:layout_height="wrap_content">
</Button>

But if I press the button, then the background image will not be changed. The code is fine and everything compiles nicely. I know that I have the same image for two different states, but it does not work even for one state in the emulator. Can someone point me where the problem is?

EDIT:

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+5
1

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xml :

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- Image display in background in select state -->
    <item android:state_pressed="true" android:drawable="@drawable/login_btn_down" />

    <!-- Image display in background in select state -->
    <item android:state_focused="true" android:drawable="@drawable/login_btn_down" />

    <!-- Default state --> 
    <item android:drawable="@drawable/login_btn" />    
</selector>
+5

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