Android @IntDef注解取代Java enum枚举提高性能
为提高Android性能，Android官方建议使用@IntDef注解替代Java的enum枚举。@IntDef的使用给出一个例子，先建立@IntDef数据结构模型，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;
}