有时候，我们为了在一个image view中显示不同的图片，往往会使用：
if (条件1) {
image.setBackground(R.id.xxx1);
} else if (条件2) {
image.setBackground(R.id.xxx2);
} ...
最近发现可以用另一个简便的方法实现相同的功能
首先，在res/drawable下建立一个xml文件，内容如下
<?xml version="1.0" encoding="utf-8"?>
<level-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:maxLevel="0" android:drawable="@android:color/transparent" />
<item android:maxLevel="1" android:drawable="@drawable/image_1" />
<item android:maxLevel="2" android:drawable="@drawable/image_2" />
<item android:maxLevel="3" android:drawable="@drawable/image_3" />
</level-list>
然后在layout中把image view的src设置成已创建好的xml文件
程序中变换图片时，只需要使用
imageview.getDrawable().setLevel(0) - 透明
imageview.getDrawable().setLevel(1) - 显示image_1
...
以此类推，好像显示剩余电量就是用这个方法来显示不同图片的
C: 代码:
/*------------农历转换函数-----------*/
char *GetDayOf(PSYSTEMTIME pSt)
{
/*天干名称*/
const char *cTianGan[] = {"甲","乙","丙","丁","戊","己","庚","辛","壬","癸"};
/*地支名称*/
const char *cDiZhi[] = {"子","丑","寅","卯","辰","巳","午","未","申","酉","戌","亥"};
/*属相名称*/
const char *cShuXiang[] = {"鼠","牛","虎","兔","龙","蛇","马","羊","猴","鸡","狗","猪"};
/*农历日期名*/
const char *cDayName[] = {"*","初一","初二","初三","初四","初五","初六","初七","初八","初九","初十","十一","十二","十三","十四","十五","十六","十七","十八","十九","二十",
"廿一","廿二","廿三","廿四","廿五","廿六","廿七","廿八","廿九","三十"};
/*农历月份名*/
const char *cMonName[] = {"*","正","二","三","四","五","六","七","八","九","十","十一","腊"};
/*公历每月前面的天数*/
const int wMonthAdd[12] = {0,31,59,90,120,151,181,212,243,273,304,334};
/*农历数据*/
const int wNongliData[100] = {2635,333387,1701,1748,267701,694,2391,133423,1175,396438,
3402,3749,331177,1453,694,201326,2350,465197,3221,3402,
400202,2901,1386,267611,605,2349,137515,2709,464533,1738,
2901,330421,1242,2651,199255,1323,529706,3733,1706,398762,
2741,1206,267438,2647,1318,204070,3477,461653,1386,2413,
330077,1197,2637,268877,3365,531109,2900,2922,398042,2395,
1179,267415,2635,661067,1701,1748,398772,2742,2391,330031,
1175,1611,200010,3749,527717,1452,2742,332397,2350,3222,
268949,3402,3493,133973,1386,464219,605,2349,334123,2709,
2890,267946,2773,592565,1210,2651,395863,1323,2707,265877};
static int wCurYear,wCurMonth,wCurDay;
static int nTheDate,nIsEnd,m,k,n,i,nBit;
TCHAR szNongli[30], szNongliDay[10],szShuXiang[10];
/*---取当前公历年、月、日---*/
wCurYear = pSt->wYear;
wCurMonth = pSt->wMonth;
wCurDay = pSt->wDay;
/*---计算到初始时间1921年2月8日的天数：1921-2-8(正月初一)---*/
nTheDate = (wCurYear - 1921) * 365 + (wCurYear - 1921) / 4 + wCurDay + wMonthAdd[wCurMonth - 1] - 38;
if((!(wCurYear % 4)) && (wCurMonth > 2))
nTheDate = nTheDate + 1;
/*--计算农历天干、地支、月、日---*/
nIsEnd = 0;
m = 0;
while(nIsEnd != 1)
{
if(wNongliData[m] < 4095)
k = 11;
else
k = 12;
n = k;
while(n>=0)
{
//获取wNongliData(m)的第n个二进制位的值
nBit = wNongliData[m];
for(i=1;i<n+1;i++)
nBit = nBit/2;
nBit = nBit % 2;
if (nTheDate <= (29 + nBit))
{
nIsEnd = 1;
break;
}
nTheDate = nTheDate - 29 - nBit;
n = n - 1;
}
if(nIsEnd){
break;
}
m = m + 1;
}
wCurYear = 1921 + m;
wCurMonth = k - n + 1;
wCurDay = nTheDate;
if (k == 12)
{
if (wCurMonth == wNongliData[m] / 65536 + 1){
wCurMonth = 1 - wCurMonth;
}
else if (wCurMonth > wNongliData[m] / 65536 + 1){
wCurMonth = wCurMonth - 1;
}
}
/*--生成农历天干、地支、属相 ==> wNongli--*/
wsprintf(szShuXiang,"%s",cShuXiang[((wCurYear - 4) % 60) % 12]);
wsprintf(szNongli,"%s(%s%s)年",szShuXiang,cTianGan[((wCurYear - 4) % 60) %10],cDiZhi[((wCurYear - 4) % 60) % 12]);
/*--生成农历月、日 ==> wNongliDay--*/
if (wCurMonth < 1){
wsprintf(szNongliDay,"闰%s",cMonName[-1 * wCurMonth]);
}
else{
strcpy(szNongliDay,cMonName[wCurMonth]);
}
strcat(szNongliDay,"月");
strcat(szNongliDay,cDayName[wCurDay]);
return strcat(szNongli,szNongliDay);
}
Objective-C 代码:
//农历转换函数
-(NSString *)LunarForSolar:(NSDate *)solarDate{
//天干名称
NSArray *cTianGan = [NSArrayarrayWithObjects:@"甲",@"乙",@"丙",@"丁",@"戊",@"己",@"庚",@"辛",@"壬",@"癸", nil];
//地支名称
NSArray *cDiZhi = [NSArrayarrayWithObjects:@"子",@"丑",@"寅",@"卯",@"辰",@"巳",@"午",@"未",@"申",@"酉",@"戌",@"亥",nil];
//属相名称
NSArray *cShuXiang = [NSArrayarrayWithObjects:@"鼠",@"牛",@"虎",@"兔",@"龙",@"蛇",@"马",@"羊",@"猴",@"鸡",@"狗",@"猪",nil];
//农历日期名
NSArray *cDayName = [NSArray arrayWithObjects:@"*",@"初一",@"初二",@"初三",@"初四",@"初五",@"初六",@"初七",@"初八",@"初九",@"初十",
@"十一",@"十二",@"十三",@"十四",@"十五",@"十六",@"十七",@"十八",@"十九",@"二十",
@"廿一",@"廿二",@"廿三",@"廿四",@"廿五",@"廿六",@"廿七",@"廿八",@"廿九",@"三十",nil];
//农历月份名
NSArray *cMonName = [NSArrayarrayWithObjects:@"*",@"正",@"二",@"三",@"四",@"五",@"六",@"七",@"八",@"九",@"十",@"十一",@"腊",nil];
//公历每月前面的天数
const int wMonthAdd[12] = {0,31,59,90,120,151,181,212,243,273,304,334};
//农历数据
const int wNongliData[100] = {2635,333387,1701,1748,267701,694,2391,133423,1175,396438
,3402,3749,331177,1453,694,201326,2350,465197,3221,3402
,400202,2901,1386,267611,605,2349,137515,2709,464533,1738
,2901,330421,1242,2651,199255,1323,529706,3733,1706,398762
,2741,1206,267438,2647,1318,204070,3477,461653,1386,2413
,330077,1197,2637,268877,3365,531109,2900,2922,398042,2395
,1179,267415,2635,661067,1701,1748,398772,2742,2391,330031
,1175,1611,200010,3749,527717,1452,2742,332397,2350,3222
,268949,3402,3493,133973,1386,464219,605,2349,334123,2709
,2890,267946,2773,592565,1210,2651,395863,1323,2707,265877};
static int wCurYear,wCurMonth,wCurDay;
static int nTheDate,nIsEnd,m,k,n,i,nBit;
//取当前公历年、月、日
NSDateComponents *components = [[NSCalendar currentCalendar] components:NSDayCalendarUnit |NSMonthCalendarUnit | NSYearCalendarUnit fromDate:solarDate];
wCurYear = [components year];
wCurMonth = [components month];
wCurDay = [components day];
//计算到初始时间1921年2月8日的天数：1921-2-8(正月初一)
nTheDate = (wCurYear - 1921) * 365 + (wCurYear - 1921) / 4 + wCurDay + wMonthAdd[wCurMonth - 1] - 38;
if((!(wCurYear % 4)) && (wCurMonth > 2))
nTheDate = nTheDate + 1;
//计算农历天干、地支、月、日
nIsEnd = 0;
m = 0;
while(nIsEnd != 1)
{
if(wNongliData[m] < 4095)
k = 11;
else
k = 12;
n = k;
while(n>=0)
{
//获取wNongliData(m)的第n个二进制位的值
nBit = wNongliData[m];
for(i=1;i<n+1;i++)
nBit = nBit/2;
nBit = nBit % 2;
if (nTheDate <= (29 + nBit))
{
nIsEnd = 1;
break;
}
nTheDate = nTheDate - 29 - nBit;
n = n - 1;
}
if(nIsEnd)
break;
m = m + 1;
}
wCurYear = 1921 + m;
wCurMonth = k - n + 1;
wCurDay = nTheDate;
if (k == 12)
{
if (wCurMonth == wNongliData[m] / 65536 + 1)
wCurMonth = 1 - wCurMonth;
else if (wCurMonth > wNongliData[m] / 65536 + 1)
wCurMonth = wCurMonth - 1;
}
//生成农历天干、地支、属相
NSString *szShuXiang = (NSString *)[cShuXiang objectAtIndex:((wCurYear - 4) % 60) % 12];
NSString *szNongli = [NSString stringWithFormat:@"%@(%@%@)年",szShuXiang, (NSString *)[cTianGanobjectAtIndex:((wCurYear - 4) % 60) % 10],(NSString *)[cDiZhi objectAtIndex:((wCurYear - 4) % 60) %12]];
//生成农历月、日
NSString *szNongliDay;
if (wCurMonth < 1){
szNongliDay = [NSString stringWithFormat:@"闰%@",(NSString *)[cMonName objectAtIndex:-1 * wCurMonth]];
}
else{
szNongliDay = (NSString *)[cMonName objectAtIndex:wCurMonth];
}
NSString *lunarDate = [NSString stringWithFormat:@"%@ %@月 %@",szNongli,szNongliDay,(NSString*)[cDayName objectAtIndex:wCurDay]];
return lunarDate;
}
NSDate *nowDate = [NSDatenew];
NSDateFormatter *formatter= [[NSDateFormatter alloc]init];
[formattersetDateFormat:@"yyyy/MM/dd HH:mm:ss"];
NSArray *array = [NSTimeZoneknownTimeZoneNames];
//快速枚举法
for(NSString *timeZoneNamein array){
[formattersetTimeZone:[NSTimeZonetimeZoneWithName:timeZoneName]];
NSLog(@"%@,%@",timeZoneName,[formatterstringFromDate:nowDate]);
}
[formatterrelease];
[nowDaterelease];