Android 點擊EditText的時候彈出軟鍵盤，點擊EditText之外空白處軟鍵盤消失

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) {  if (myActivity.this.getCurrentFocus() != null) {  
                if (myActivity.this.getCurrentFocus().getWindowToken() != null) {  
                    imm.hideSoftInputFromWindow(myActivity.this.getCurrentFocus().getWindowToken(),  
                            InputMethodManager.HIDE_NOT_ALWAYS);  
                }  
            }  
        }  
        return super.onTouchEvent(event);  
    }