Custom Checkable View which responds to Selector

Question

I have a group of FrameLayout which I want to be checkable/selectable,

That is, after a click I would like the FrameLayout to display as checked - when pressed again I would like it to become unchecked. What's more, I want this visual que to be described as usual through though the use of a <selector>.

I can't seem to get this working - I'm not sure what I'm missing:

public class CheckableFrameLayout extends FrameLayout implements Checkable {
    private boolean mChecked = false;
    public CheckableFrameLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public void setChecked(boolean checked) {
        mChecked = checked;
        refreshDrawableState();
    }

    public boolean isChecked() {
        return mChecked;
    }

    public void toggle() {
        setChecked(!mChecked);
    }
}

The layout of the CheckableFrameLayout:

<com.test.view.CheckableFrameLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/selector_horizontal"
    android:clickable="true" >

The selector backing it (selector_horizontal.xml):

<item android:drawable="@drawable/selector_vertical_selected" android:state_pressed="false" android:state_checked="true"/>  
<item android:drawable="@drawable/selector_vertical_pressed" android:state_pressed="true" android:state_checked="false"/>
<item android:drawable="@drawable/selector_vertical_normal" android:state_pressed="false" android:state_checked="false"/>

Using the above code the "state_pressed" is working fine, but the View itself is not becoming checked (not is the Checkable code being called as discovered through debug).

Answer 1

Adding the following code to a Checkable class allows Selectors to work:

private static final int[] CheckedStateSet = {
    android.R.attr.state_checked,
};

@Override
protected int[] onCreateDrawableState(int extraSpace) {
    final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
    if (isChecked()) {
        mergeDrawableStates(drawableState, CheckedStateSet);
    }
    return drawableState;
}

@Override
public boolean performClick() {
    toggle();
    return super.performClick();
}