I have followed this tutorial and created my own keyboard, but I can't change the background color for it's keys.

keyboard.xml

<Keyboard xmlns:android="http://schemas.android.com/apk/res/android"
android:horizontalGap="3px"
android:keyWidth="10%p"
android:keyHeight="60dp"
android:keyBackground="@color/color_green" 
android:keyTextColor="@color/color_red"
android:verticalGap="3px">

keyboard_view.xml

<android.inputmethodservice.KeyboardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/keyboard_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:background="@color/all_white">
</android.inputmethodservice.KeyboardView>

MyInputMethodService.java

    @Override
public View onCreateInputView() {
    keyboardView = (KeyboardView) getLayoutInflater().inflate(R.layout.keyboard_view, null);
    keyboardView.setPreviewEnabled(false);
    keyboard = new Keyboard(this, R.xml.number_pad);
    keyboardView.setKeyboard(keyboard);
    keyboardView.setOnKeyboardActionListener(this);
    return keyboardView;
}

enter image description here

I've tried change android:keyBackground and android:keyTextColor, but nothing changes, but if I change some key value in the same file it works.

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