Code Fragment-對於if語句中的boolean值分開判斷的處理。

本文參考自《代碼整潔之道》，這本書，非常好！

向方法中傳入boolean值參數，用於判斷邏輯並分開執行。缺點：

• 方法簽名立即變得複雜起來。
• 此方法做的事情多餘一件。

執行個體：

    /**     * @param isChecked     */    protected void setAllDayViewsVisibility(boolean isChecked) {        if (isChecked) {            if (mEndTime.hour == 0 && mEndTime.minute == 0) {                mEndTime.monthDay--;                long endMillis = mEndTime.normalize(true);                // Do not allow an event to have an end time                // before the                // start time.                if (mEndTime.before(mStartTime)) {                    mEndTime.set(mStartTime);                    endMillis = mEndTime.normalize(true);                }                setDate(mEndDateButton, endMillis);                setTime(mEndTimeButton, endMillis);            }            mStartTimeButton.setVisibility(View.GONE);            mEndTimeButton.setVisibility(View.GONE);            mTimezoneRow.setVisibility(View.GONE);        } else {            if (mEndTime.hour == 0 && mEndTime.minute == 0) {                mEndTime.monthDay++;                long endMillis = mEndTime.normalize(true);                setDate(mEndDateButton, endMillis);                setTime(mEndTimeButton, endMillis);            }            mStartTimeButton.setVisibility(View.VISIBLE);            mEndTimeButton.setVisibility(View.VISIBLE);            mTimezoneRow.setVisibility(View.VISIBLE);        }        updateHomeTime();    }

重構以後，變成2個方法

protected void setAllDayViewsGone() {if (mEndTime.hour == 0 && mEndTime.minute == 0) {mEndTime.monthDay--;long endMillis = mEndTime.normalize(true);// Do not allow an event to have an end time// before the// start time.if (mEndTime.before(mStartTime)) {mEndTime.set(mStartTime);endMillis = mEndTime.normalize(true);}setDate(mEndDateButton, endMillis);setTime(mEndTimeButton, endMillis);}mStartTimeButton.setVisibility(View.GONE);mEndTimeButton.setVisibility(View.GONE);mTimezoneRow.setVisibility(View.GONE);updateHomeTime();}protected void setAllDayViewsVisible() {if (mEndTime.hour == 0 && mEndTime.minute == 0) {mEndTime.monthDay++;long endMillis = mEndTime.normalize(true);setDate(mEndDateButton, endMillis);setTime(mEndTimeButton, endMillis);}mStartTimeButton.setVisibility(View.VISIBLE);mEndTimeButton.setVisibility(View.VISIBLE);mTimezoneRow.setVisibility(View.VISIBLE);updateHomeTime();}