Android 枚举（Enum）类最佳实践

public class MainActivity extends Activity {

//先定义 常量
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;

//用@IntDef "包住" 常量；
// @Retention 定义策略
// 声明构造器
@IntDef({SUNDAY, MONDAY,TUESDAY,WEDNESDAY,THURSDAY,FRIDAY,SATURDAY})
@Retention(RetentionPolicy.SOURCE)
public @interface WeekDays {}

@WeekDays int currentDay = SUNDAY;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setCurrentDay(WEDNESDAY);

//声明变量
@WeekDays int today = getCurrentDay();

switch (today){
case SUNDAY:
break;
case MONDAY:
break;
case TUESDAY:
break;
case WEDNESDAY:
break;
case THURSDAY:
break;
case FRIDAY:
break;
case SATURDAY:
break;
default:
break;
}

}

public void setCurrentDay(@WeekDays int currentDay) {
this.currentDay = currentDay;
}

@WeekDays
public int getCurrentDay() {
return currentDay;
}
}

compile 'com.android.support:support-annotations:22.0.0'