Android keyboard show/hide event

    public static void hideKeyBoard(View v) {
        InputMethodManager imm = (InputMethodManager) v.getContext().getSystemService(INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(v.getApplicationWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
    }

    public static void showKeyBoard(View v) {
        InputMethodManager imm = (InputMethodManager) v.getContext().getSystemService(INPUT_METHOD_SERVICE);
        imm.showSoftInput(v, InputMethodManager.SHOW_IMPLICIT);
    }

    private ViewTreeObserver.OnGlobalLayoutListener keyboardLayoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            int heightDiff = rootLayout.getRootView().getHeight() - rootLayout.getHeight();
            int contentViewTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();

            LocalBroadcastManager broadcastManager = LocalBroadcastManager.getInstance(BaseFragmentActivity.this);

            if(heightDiff <= contentViewTop){
                onHideKeyboard();

                Intent intent = new Intent("KeyboardWillHide");
                broadcastManager.sendBroadcast(intent);
            } else {
                int keyboardHeight = heightDiff - contentViewTop;
                onShowKeyboard(keyboardHeight);

                Intent intent = new Intent("KeyboardWillShow");
                intent.putExtra("KeyboardHeight", keyboardHeight);
                broadcastManager.sendBroadcast(intent);
            }
        }
    };
    private boolean keyboardListenersAttached = false;
    private ViewGroup rootLayout;

    protected void onShowKeyboard(int keyboardHeight) {}
    protected void onHideKeyboard() {}

    protected void attachKeyboardListeners(View contentView) {
        if (keyboardListenersAttached) {
            return;
        }

        rootLayout = (ViewGroup)contentView;
        rootLayout.getViewTreeObserver().addOnGlobalLayoutListener(keyboardLayoutListener);
        keyboardListenersAttached = true;
    }