宣告Utils類中的方法

    public static void hideKeyboard(MotionEvent event, View view,
                                    Activity activity) {
        try {
            if (view != null && view instanceof EditText) {
                int[] location = {0, 0};
                view.getLocationInWindow(location);
                
 
int left = location[0], top = location[1], right = left
                        + view.getWidth(), bootom = top + view.getHeight();
                // 判斷焦點位置座標是否在空間內，如果位置在控制元件外，則隱藏鍵盤
                if (event.getRawX() < left || event.getRawX() > right
                        || event.getY() < top || event.getRawY() > bootom) {
                    
 
// 隱藏鍵盤
                    IBinder token = view.getWindowToken();
                    InputMethodManager inputMethodManager = (InputMethodManager) activity
                            .getSystemService(Context.INPUT_METHOD_SERVICE);
                    inputMethodManager.hideSoftInputFromWindow(token,
                            InputMethodManager.HIDE_NOT_ALWAYS);
                }
            }
        } 
 
catch (Exception e) {
            e.printStackTrace();
        }
    }

實現類中寫明

@Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                View view = getCurrentFocus();
                Utils.hideKeyboard(ev, view, MessageBoardActivity.this);//呼叫方法判斷是否需要隱藏鍵盤
                break;
            default:
                break;
        }
        return super.dispatchTouchEvent(ev);
    }