Android中点击空白处隐藏软键盘

InputMethodManager imm= (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);

@Override
    public
 
boolean
 onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        if
 (event.getAction() == MotionEvent.ACTION_DOWN) {
            System.out.println("down"
);
            if
 (RegisterActivity.
this
.getCurrentFocus() != 
null
) {
                if
 (RegisterActivity.
this
.getCurrentFocus().getWindowToken() != 
null
) {
                    imm.hideSoftInputFromWindow(RegisterActivity.this
.getCurrentFocus().getWindowToken(),
                            InputMethodManager.HIDE_NOT_ALWAYS);
                }
            }
        }
        return
 
super
.onTouchEvent(event);
    }