Use key index as virtual view ID.

    }

    /**

     * Generates a virtual view identifier for the specified key.

     * Generates a virtual view identifier for the given key. Returned

     * identifiers are valid until the next global layout state change.

     *

     * @param key The key to identify.

     * @return A virtual view identifier.

     */

    private static int generateVirtualViewIdForKey(Key key) {

        // The key code is unique within an instance of a Keyboard.

        return key.mCode;

        // The key x- and y-coordinates are stable between layout changes.

        // Generate an identifier by bit-shifting the x-coordinate to the

        // left-half of the integer and OR'ing with the y-coordinate.

        return ((0xFFFF & key.mX) << (Integer.SIZE / 2)) | (0xFFFF & key.mY);

    }

    private final OnGlobalLayoutListener mGlobalLayoutListener = new OnGlobalLayoutListener() {