Android @IntDef注解取代Java enum枚舉提高性能

為提高Android性能，Android官方建議使用@IntDef注解替代Java的enum枚舉。@IntDef的使用給出一個例子，先建立@IntDef數據結構模型，例如MyDay.java：

package zhangphil.test;

import android.support.annotation.IntDef;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

public class MyDay {

public static final int SUNDAY = 0;

public static final int MONDAY = 1;

public static final int TUESDAY = 2;

public static final int WEDNESDAY = 3;

public static final int THURSDAY = 4;

public static final int FRIDAY = 5;

public static final int SATURDAY = 6;

@IntDef({SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY})

@Retention(RetentionPolicy.SOURCE)

public @interface WeekDays {

}

@WeekDays

private int mCurDay = SUNDAY;

public void setCurrentDay(@WeekDays int currentDay) {

this.mCurDay = currentDay;

}

@WeekDays

public int getCurrentDay() {

return mCurDay;

}

}

使用：

MyDay days = new MyDay();

days.setCurrentDay(MyDay.TUESDAY);

@MyDay.WeekDays int day = days.getCurrentDay();

switch (day) {

case MyDay.SUNDAY:

break;

case MyDay.MONDAY:

break;

case MyDay.TUESDAY:

break;

case MyDay.WEDNESDAY:

break;

case MyDay.THURSDAY:

break;

case MyDay.FRIDAY:

break;

case MyDay.SATURDAY:

break;

default:

break;

}

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