Merge "Text layout in switch may be null when accessibility events are fired." into jb-mr1-dev

    @Override

    public void onPopulateAccessibilityEvent(AccessibilityEvent event) {

        super.onPopulateAccessibilityEvent(event);

        CharSequence text = isChecked() ? mOnLayout.getText() : mOffLayout.getText();

        if (!TextUtils.isEmpty(text)) {

            event.getText().add(text);

        Layout layout =  isChecked() ? mOnLayout : mOffLayout;

        if (layout != null && !TextUtils.isEmpty(layout.getText())) {

            event.getText().add(layout.getText());

        }

    }