RGBA是0.0～1.0，不是0～255
在iOS的开发中经常用到一个对象UIColor，这个对象提供了一个通过RGBA来设置颜色的方法：[UIColor colorWithRed: green: blue: alpha:];
但是在使用这个方法的时候很多人会遇到设置的颜色不成功的问题，下面就来说明一下使用这个方法应注意的问题点：
1.这个方法中RGBA的值都是小数；
2.颜色值RGB是通过你的颜色值除以255（0xFF）得来的。
[UIColor colorWithRed:123/255 green:127/255 blue:120/255 alpha:1];这个设置是错误的，因为127/255的结果是整数0，而不是我们想要的小数。#000000代表的颜色是黑色。
正确的设置方法应该是：[UIColor colorWithRed:123.0/255 green:127.0/255 blue:120.0/255 alpha:1];
获得通讯录中联系人的所有属性 ，看代码： ABAddressBookRef addressBook = ABAddressBookCreate(); CFArrayRef results = ABAddressBookCopyArrayOfAllPeople(addressBook); for(int i = 0; i CFArrayGetCount(results); i++) { ABRecord
获得通讯录中联系人的所有属性 ，看代码：
ABAddressBookRef addressBook = ABAddressBookCreate();
CFArrayRef results = ABAddressBookCopyArrayOfAllPeople(addressBook);
for(int i = 0; i < CFArrayGetCount(results); i++)
{
ABRecordRef person = CFArrayGetValueAtIndex(results, i);
//读取firstname
NSString *personName = (NSString*)ABRecordCopyValue(person, kABPersonFirstNameProperty);
if(personName != nil)
textView.text = [textView.text stringByAppendingFormat:@"\n姓名：%@\n",personName];
//读取lastname
NSString *lastname = (NSString*)ABRecordCopyValue(person, kABPersonLastNameProperty);
if(lastname != nil)
textView.text = [textView.text stringByAppendingFormat:@"%@\n",lastname];
//读取middlename
NSString *middlename = (NSString*)ABRecordCopyValue(person, kABPersonMiddleNameProperty);
if(middlename != nil)
textView.text = [textView.text stringByAppendingFormat:@"%@\n",middlename];
//读取prefix前缀
NSString *prefix = (NSString*)ABRecordCopyValue(person, kABPersonPrefixProperty);
if(prefix != nil)
textView.text = [textView.text stringByAppendingFormat:@"%@\n",prefix];
//读取suffix后缀
NSString *suffix = (NSString*)ABRecordCopyValue(person, kABPersonSuffixProperty);
if(suffix != nil)
textView.text = [textView.text stringByAppendingFormat:@"%@\n",suffix];
//读取nickname呢称
NSString *nickname = (NSString*)ABRecordCopyValue(person, kABPersonNicknameProperty);
if(nickname != nil)
textView.text = [textView.text stringByAppendingFormat:@"%@\n",nickname];
//读取firstname拼音音标
NSString *firstnamePhonetic = (NSString*)ABRecordCopyValue(person, kABPersonFirstNamePhoneticProperty);
if(firstnamePhonetic != nil)
textView.text = [textView.text stringByAppendingFormat:@"%@\n",firstnamePhonetic];
//读取lastname拼音音标
NSString *lastnamePhonetic = (NSString*)ABRecordCopyValue(person, kABPersonLastNamePhoneticProperty);
if(lastnamePhonetic != nil)
textView.text = [textView.text stringByAppendingFormat:@"%@\n",lastnamePhonetic];
//读取middlename拼音音标
NSString *middlenamePhonetic = (NSString*)ABRecordCopyValue(person, kABPersonMiddleNamePhoneticProperty);
if(middlenamePhonetic != nil)
textView.text = [textView.text stringByAppendingFormat:@"%@\n",middlenamePhonetic];
//读取organization公司
NSString *organization = (NSString*)ABRecordCopyValue(person, kABPersonOrganizationProperty);
if(organization != nil)
textView.text = [textView.text stringByAppendingFormat:@"%@\n",organization];
//读取jobtitle工作
NSString *jobtitle = (NSString*)ABRecordCopyValue(person, kABPersonJobTitleProperty);
if(jobtitle != nil)
textView.text = [textView.text stringByAppendingFormat:@"%@\n",jobtitle];
//读取department部门
NSString *department = (NSString*)ABRecordCopyValue(person, kABPersonDepartmentProperty);
if(department != nil)
textView.text = [textView.text stringByAppendingFormat:@"%@\n",department];
//读取birthday生日
NSDate *birthday = (NSDate*)ABRecordCopyValue(person, kABPersonBirthdayProperty);
if(birthday != nil)
textView.text = [textView.text stringByAppendingFormat:@"%@\n",birthday];
//读取note备忘录
NSString *note = (NSString*)ABRecordCopyValue(person, kABPersonNoteProperty);
if(note != nil)
textView.text = [textView.text stringByAppendingFormat:@"%@\n",note];
//第一次添加该条记录的时间
NSString *firstknow = (NSString*)ABRecordCopyValue(person, kABPersonCreationDateProperty);
NSLog(@"第一次添加该条记录的时间%@\n",firstknow);
//最后一次修改該条记录的时间
NSString *lastknow = (NSString*)ABRecordCopyValue(person, kABPersonModificationDateProperty);
NSLog(@"最后一次修改該条记录的时间%@\n",lastknow);
//获取email多值
ABMultiValueRef email = ABRecordCopyValue(person, kABPersonEmailProperty);
int emailcount = ABMultiValueGetCount(email);
for (int x = 0; x < emailcount; x++)
{
//获取email Label
NSString* emailLabel = (NSString*)ABAddressBookCopyLocalizedLabel(ABMultiValueCopyLabelAtIndex(email, x));
//获取email值
NSString* emailContent = (NSString*)ABMultiValueCopyValueAtIndex(email, x);
textView.text = [textView.text stringByAppendingFormat:@"%@:%@\n",emailLabel,emailContent];
}
//读取地址多值
ABMultiValueRef address = ABRecordCopyValue(person, kABPersonAddressProperty);
int count = ABMultiValueGetCount(address);
for(int j = 0; j < count; j++)
{
//获取地址Label
NSString* addressLabel = (NSString*)ABMultiValueCopyLabelAtIndex(address, j);
textView.text = [textView.text stringByAppendingFormat:@"%@\n",addressLabel];
//获取該label下的地址6属性
NSDictionary* personaddress =(NSDictionary*) ABMultiValueCopyValueAtIndex(address, j);
NSString* country = [personaddress valueForKey:(NSString *)kABPersonAddressCountryKey];
if(country != nil)
textView.text = [textView.text stringByAppendingFormat:@"国家：%@\n",country];
NSString* city = [personaddress valueForKey:(NSString *)kABPersonAddressCityKey];
if(city != nil)
textView.text = [textView.text stringByAppendingFormat:@"城市：%@\n",city];
NSString* state = [personaddress valueForKey:(NSString *)kABPersonAddressStateKey];
if(state != nil)
textView.text = [textView.text stringByAppendingFormat:@"省：%@\n",state];
NSString* street = [personaddress valueForKey:(NSString *)kABPersonAddressStreetKey];
if(street != nil)
textView.text = [textView.text stringByAppendingFormat:@"街道：%@\n",street];
NSString* zip = [personaddress valueForKey:(NSString *)kABPersonAddressZIPKey];
if(zip != nil)
textView.text = [textView.text stringByAppendingFormat:@"邮编：%@\n",zip];
NSString* coutntrycode = [personaddress valueForKey:(NSString *)kABPersonAddressCountryCodeKey];
if(coutntrycode != nil)
textView.text = [textView.text stringByAppendingFormat:@"国家编号：%@\n",coutntrycode];
}
//获取dates多值
ABMultiValueRef dates = ABRecordCopyValue(person, kABPersonDateProperty);
int datescount = ABMultiValueGetCount(dates);
for (int y = 0; y < datescount; y++)
{
//获取dates Label
NSString* datesLabel = (NSString*)ABAddressBookCopyLocalizedLabel(ABMultiValueCopyLabelAtIndex(dates, y));
//获取dates值
NSString* datesContent = (NSString*)ABMultiValueCopyValueAtIndex(dates, y);
textView.text = [textView.text stringByAppendingFormat:@"%@:%@\n",datesLabel,datesContent];
}
//获取kind值
CFNumberRef recordType = ABRecordCopyValue(person, kABPersonKindProperty);
if (recordType == kABPersonKindOrganization) {
// it's a company
NSLog(@"it's a company\n");
} else {
// it's a person, resource, or room
NSLog(@"it's a person, resource, or room\n");
}
//获取IM多值
ABMultiValueRef instantMessage = ABRecordCopyValue(person, kABPersonInstantMessageProperty);
for (int l = 1; l < ABMultiValueGetCount(instantMessage); l++)
{
//获取IM Label
NSString* instantMessageLabel = (NSString*)ABMultiValueCopyLabelAtIndex(instantMessage, l);
textView.text = [textView.text stringByAppendingFormat:@"%@\n",instantMessageLabel];
//获取該label下的2属性
NSDictionary* instantMessageContent =(NSDictionary*) ABMultiValueCopyValueAtIndex(instantMessage, l);
NSString* username = [instantMessageContent valueForKey:(NSString *)kABPersonInstantMessageUsernameKey];
if(username != nil)
textView.text = [textView.text stringByAppendingFormat:@"username：%@\n",username];
NSString* service = [instantMessageContent valueForKey:(NSString *)kABPersonInstantMessageServiceKey];
if(service != nil)
textView.text = [textView.text stringByAppendingFormat:@"service：%@\n",service];
}
//读取电话多值
ABMultiValueRef phone = ABRecordCopyValue(person, kABPersonPhoneProperty);
for (int k = 0; k<ABMultiValueGetCount(phone); k++)
{
//获取电话Label
NSString * personPhoneLabel = (NSString*)ABAddressBookCopyLocalizedLabel(ABMultiValueCopyLabelAtIndex(phone, k));
//获取該Label下的电话值
NSString * personPhone = (NSString*)ABMultiValueCopyValueAtIndex(phone, k);
textView.text = [textView.text stringByAppendingFormat:@"%@:%@\n",personPhoneLabel,personPhone];
}
//获取URL多值
ABMultiValueRef url = ABRecordCopyValue(person, kABPersonURLProperty);
for (int m = 0; m < ABMultiValueGetCount(url); m++)
{
//获取电话Label
NSString * urlLabel = (NSString*)ABAddressBookCopyLocalizedLabel(ABMultiValueCopyLabelAtIndex(url, m));
//获取該Label下的电话值
NSString * urlContent = (NSString*)ABMultiValueCopyValueAtIndex(url,m);
textView.text = [textView.text stringByAppendingFormat:@"%@:%@\n",urlLabel,urlContent];
}
//读取照片
NSData *image = (NSData*)ABPersonCopyImageData(person);
UIImageView *myImage = [[UIImageView alloc] initWithFrame:CGRectMake(200, 0, 50, 50)];
[myImage setImage:[UIImage imageWithData:image]];
myImage.opaque = YES;
[textView addSubview:myImage];
}
CFRelease(results);
CFRelease(addressBook);
原帖地址：http://www.cocoachina.com/bbs/read.php?tid=62527&fpage=2
转自：http://hi.baidu.com/windy1123/blog/item/87b9b638d588372271cf6c32.html
今天在在编译android工程时遇到 Unable to execute dex: Java heap space的问题，现在分享一下
上网找了一下，有两种：
1. eclipse.int 添加内存
2. 导入工程的jar通过add User Library方式导入
右键工程->build path->add Library->user Library->user Libraries->new->随便取个名字->add JARs->ok
添加过程中记得将user systemLibrary选中
其中第一种方法我已经尝试将在eclipse.ini中将
--launcher.XXMaxPermSize
512m（这个修改要参考自己机器的物理内存大小），下面会附上eclipse.ini中参数的含义；
重点说一下第二种：
开始按照网上说的正确Add User Library and set as User system Library，同时根据项目的需要将不需要的关联library给去除
出现Unable to execute dex: Java heap space主要的原因是JVM加载jar包占用了大量的分配的内存
eclipse.ini
-startup
plugins/org.eclipse.equinox.launcher_1.0.201.R35x_v20090715.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.0.200.v20090519
-showsplash
org.eclipse.platform
--launcher.XXMaxPermSize
256m
-vmargs
-Xms40m
-Xmx256m
下面直接可以配置相关参数
参数中-vmargs的意思是设置JVM参数，所以后面的其实都是JVM的参数了，我们首先了解一下JVM内存管理的机制，然后再解释每个参数代表的含义。
堆(Heap)和非堆(Non-heap)内存
按照官方的说法：“Java 虚拟机具有一个堆，堆是运行时数据区域，所有类实例和数组的内存均从此处分配。堆是在Java 虚拟机启动时创建的。”“在JVM中堆之外的内存称为非堆内存(Non-heap memory)”。可以看出JVM主要管理两种类型的内存：堆和非堆。简单来说堆就是Java代码可及的内存，是留给开发人员使用的；非堆就是JVM留给自己用的，所以方法区、JVM内部处理或优化所需的内存(如JIT编译后的代码缓存)、每个类结构(如运行时常数池、字段和方法数据)以及方法和构造方法的代码都在非堆内存中。
堆内存分配
JVM初始分配的内存由-Xms指定，默认是物理内存的1/64；JVM最大分配的内存由-Xmx指定，默认是物理内存的1/4。默认空余堆内存小于40%时，JVM就会增大堆直到-Xmx的最大限制；空余堆内存大于70%时，JVM会减少堆直到-Xms的最小限制。因此服务器一般设置-Xms、-Xmx相等以避免在每次GC 后调整堆的大小。
非堆内存分配
JVM使用-XX:PermSize设置非堆内存初始值，默认是物理内存的1/64；由XX:MaxPermSize设置最大非堆内存的大小，默认是物理内存的1/4。
JVM内存限制(最大值)
首先JVM内存限制于实际的最大物理内存，假设物理内存无限大的话，JVM内存的最大值跟操作系统有很大的关系。简单的说就32位处理器虽然可控内存空间有4GB,但是具体的操作系统会给一个限制，这个限制一般是2GB-3GB（一般来说Windows系统下为1.5G-2G，Linux系统下为2G-3G），而64bit以上的处理器就不会有限制了。
参数形如“项 值”这种形式，中间有空格的需要换行书写，如果值中有空格的需要用双引号包括起来。比如我们使用-vm C:\Java\jre1.6.0\bin\javaw.exe参数设置虚拟机，在eclipse.ini文件中要写成这样：
-vm
C:\Java\jre1.6.0\bin\javaw.exe
其中–launcher.XXMaxPermSize（注意最前面是两个连接线）跟-XX:MaxPermSize参数的含义基本是一样的，区别就是前者是eclipse.exe启动的时候设置的参数，而后者是eclipse所使用的JVM中的参数。