padding

I have a CheckBox that I want centered within its own boundaries, not pushed to the side. Probably easier demonstrated than explained: Note that it isn't centered. Currently defined as: <CheckBox android:id="@+id/checkbox_star" android:layout_width="wrap_content" android:layout_height="match_parent" android:button="@drawable/btn_favorite" android:layout_gravity="center" android:minWidth="48dp" /> Nevermind the custom button drawable. It behaves the same with a vanilla CheckBox as well (the small check box behaves the same). I believe the problem is that the Checkbox widget uses a regular

为什么要使用线程池？ 线程是一个操作系统概念。操作系统负责这个线程的创建、挂起、运行、阻塞和终结操作。而操作系统创建线程、切换线程状态、终结线程都要进行CPU调度——这是一个耗费时间和系统资源的事情。 另一方面，大多数实际场景中是这样的：处理某一次请求的时间是非常短暂的，但是请求数量是巨大的。这种技术背景下，如果我们为每一个请求都单独创建一个线程，那么物理机的所有资源基本上都被操作系统创建线程、切换线程状态、销毁线程这些操作所占用，用于业务请求处理的资源反而减少了。所以最理想的处理方式是，将处理请求的线程数量控制在一个范围，既保证后续的请求不会等待太长时间，又保证物理机将足够的资源用于请求处理本身。 另外，一些操作系统是有最大线程数量限制的。当运行的线程数量逼近这个值的时候，操作系统会变得不稳定。这也是我们要限制线程数量的原因。 线程池的基本使用方式 JAVA语言为我们提供了两种基础线程池的选择：ScheduledThreadPoolExecutor和ThreadPoolExecutor。它们都实现了ExecutorService接口（注意，ExecutorService接口本身和“线程池”并没有直接关系，它的定义更接近“执行器”，而“使用线程管理的方式进行实现”只是其中的一种实现方式）。这篇文章中，我们主要围绕 ThreadPoolExecutor 类进行讲解。

I have the following layout, and I'm trying to add a padding to the left and right.. The controls are a disabled UIButton. My code for creating a button is this: UIButton *buttonTime = [[UIButton alloc] initWithFrame:CGRectMake(90, 10, 50, 20)]; [buttonTime setBackgroundImage:[[UIImage imageNamed:@"bubble.png"] stretchableImageWithLeftCapWidth:9 topCapHeight:13] forState:UIControlStateDisabled]; [buttonTime setTitle:@"27 feb, 2011 11:10 PM" forState:UIControlStateDisabled]; [buttonTime setTitleColor:[UIColor blackColor] forState:UIControlStateDisabled]; buttonTime.titleLabel.font=[UIFont

as the title says i am trying to add padding-like behavior to a UITextView. The textview is generated when the view is pushed inside my navigation controller and the following code occurs: self.textView.layer.cornerRadius = 7; //pretty stuff is pretty NSString *description = appDelegate.productInDisplay.description; [self.textView setText:description]; //pretty stuff has content now CGRect frame = textView.frame; frame.size.height = textView.contentSize.height; textView.frame = frame; //set the UITextView to the size of it's containing text. self.textView.editable = NO; self.theScrollView

I have an html5 page with a navbar. Completely scratch coded. I just recently added a doctype to the item, and now I’m getting extra space under my navbar. If I remove the doctype declaration, it goes back to normal. I have completely reset padding, margins, etc. on everything, and cut it down to the a small amount of code that illustrates the issue. The page can be seen at http://hackthetruth.org/webdesign/broken Does anyone know why declaring the doctype is messing with the height of a div? This is an interesting and subtle, yet important consideration when using inline-block . The short

1.随便写几个标签，不加样式控制的情况下，各自的margin 和padding差异较大。 解决方案：CSS里 *{margin:0;padding:0;} 2.几个img标签放在一起的时候，有些浏览器会有默认的间距，加了问题一中提到的通配符也不起作用。 解决方案：使用float属性为img布局 3.display:flex： IE10 也是支持部分功能。而 IE8 和 IE9 则完全不支持 flexbox 解决方案：无，只能换个方法 4.transform：动画属性 ie9不支持 来源： CSDN 作者： Twilight晨昏 链接： https://blog.csdn.net/cl13735587201/article/details/71216431