我有两个文件，其中有android键码： Qwerty.xml 以及 numbers.xml . 在任何按下shift键时，我都希望显示数字键盘。

java类：

public class MyKeyboard extends InputMethodService
                        implements KeyboardView.OnKeyboardActionListener
{
    private KeyboardView kv;
    private Keyboard keyboard;
    private boolean caps = false;
    @Override
    public View onCreateInputView() {
        kv = (KeyboardView)getLayoutInflater().inflate(R.layout.keyboard, null);
        keyboard = new Keyboard(this, R.xml.qwerty);
        //keyboard = new Keyboard(this,R.xml.qwerty1);
        kv.setKeyboard(keyboard);
        kv.setOnKeyboardActionListener(this);
        return kv;
    }
    @Override
    public void onPress(int primaryCode) {
    }
    @Override
    public void onRelease(int primaryCode) {
    }
    @Override
    public void onKey(int primaryCode, int[] keyCodes) {
        InputConnection ic = getCurrentInputConnection();
        switch (primaryCode){
            case Keyboard.KEYCODE_DELETE:
                ic.deleteSurroundingText(1, 0);
                break;
            case Keyboard.KEYCODE_SHIFT:
                caps = !caps;
                keyboard.setShifted(caps);
                kv.invalidateAllKeys();
                break;
            case Keyboard.KEYCODE_DONE:
                ic.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_ENTER));
                break;
            default:
                char code = (char) primaryCode;
                if (Character.isLetter(code) && caps) {
                   code = Character.toUpperCase(code);
                }
                ic.commitText(String.valueOf(code), 1);
        }
    }
    @Override
    public void onText(CharSequence text) {
    }
    @Override
    public void swipeLeft() {
    }
    @Override
    public void swipeRight() {
    }
    @Override
    public void swipeDown() {
    }
    @Override
    public void swipeUp() {
    }
}

有什么方法可以调用吗 case Keyboard.KEYCODE_SHIFT 为了加载 numbers.xml 要显示数字键盘的文件？