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, hdpi, xdpi, xxdpi? How to calculate and differentiate?1, what is the absolute length unit? What is a relative length unit?Absolute length units: in (inch inch), cm (cm), mm (mm), pt (LB), PC (PICA). In, CM, mm, and actual units are identical. PT is a commonly used unit in

Why write this?Article: I have been in contact with brew for more than four months. Although it is not a long time, I still have some knowledge about brew and some of my own opinions. I don't like to learn something useful for my work just to do a good job. I like to know what a thing is. At present, whether it is brew

　　What is the OTG line? To understand what the OTG line is, first we need to understand what OTG functions are on the phone or other mobile devices, OTG: On-the-go, that is, in the abs

Recognize what Gradle is under Android Studio What is Gradle? I haven't figured it out at the beginning. The official explanation is:Gradle is a project automation construction tool based on the concepts of Apache Ant and Apache Maven.So

Question 1. Why is the database designed to be indexed?Library to save 1000W books, to find the "architect of the Road", a check, to find out when to go?The librarian then devised a set of rules: On the first floor of the history class, the second floor of literature, third floor put it class ... It class, sub-software class, hardware class ... Software classes, sorted by book title Sequencer ... To find a book quickly.With the a

What is JNDI? Jndi is the Java Naming and directory interface (Java naming and directory Interface), which is one of the important specifications in the EE specification, and many experts believe that there is no thorough understanding of the significance and role of Jndi, T

installation package into the SD card; 2, the APK file renamed as the form of com.xxx.xxx.apk (Contrast system app directory under the file name changes, pure Chinese or any other file name can be successful I did not test ~); 3, with the root of the re browser to the card in the APK file to move or copy to the system directory in the app directory (that is, you can see the other application icon that directory); 4, find you copied over the APK fi

Referring to Adb.exe, friends who have been concerned about our Android series tutorials should not be unfamiliar, because we operate the Android phone directly via ADB regardless of the root authority or the machine, but probably most of the ADB is only limited to the one step of the brush tutorial, Does not have an in-depth and comprehensive understanding of it. Now I will give you Android

as I know, many procedures are not a problem. Most of the problems occur because of a computer's environmental configuration problem, or a faulty operation. Don't you think that's where the problem lies? "The man was speechless after listening.Seventh ChapterLittle printf came to the fourth place and met a man whose computer was almost covered with sticky notes, and no one knew what he was doing."Motor-mvc, Quadrangular JS, Goquery, Cometeor, some Ja

What is the difference between static pages and Memcached? Sorry, I don't know much about php. I do java, because Memcached also exists in java. I still have some knowledge about Memcached in java. Our company is working on a mobile phone application, and PHP is used on the

I believe that a lot of users with Windows system have a habit, that is, when we work with the computer, will always go to the right mouse button to refresh the system. A friend with obsessive-compulsive disorder will brush the last 10 times in a row, psychologically thinking that the computer will be faster. This refreshing process is actually used to update the display information for the current data. In

I believe every Android novice will encounter this problem, I hope this post can let you no longer tangled.Px:That is, the pixel, 1px represents a physical pixel on the screen;PX units are not recommended, as the same 100px picture, the actual size displayed on different phones may be different as shown (images from Android Developer Guide, same as below).The occasional use of PX is when you need to draw a

Recently a friend went to the computer city to buy a 16G u disk, the computer with 360 u disk authentication test results show that the actual capacity of only 4 G, and suggest that it is shrinking u disk. Friends immediately went to buy a U disk where to find business, merchant wrong, obediently changed a true 16G capacity of U disk. What is the shrinking U disk

Recently the next door began to maliciously hurt the machines of friends who had bought S-OFF. I can't stand it anymore. Post out a description. What is S-OFF? S stands for security lock. S-OFF is the protection off. S-ON is to protect open Secure lock is a security lock.

Chapter 1 view the world of messages in chapter 3 of Windows (I) What is a message? 3.1 send messages to the "Drawing" program 3.2 process custom messages in VCL 3.2.1 custom message 3.2.2 prepare two windows 3.2.3 message sending 3.2.4 message recipient Processing 3.2.5 display form2 and form1 together 3.2.6 run Conclusion 3.3 　 What

QQ Public number is what the QQ public number what is the use? QQ public number is simple, can be understood as the life service number, and micro-letter public number basic mode of operation is the same. Merchants to promote two

recently there are plans to assemble a computer friend, asked a small series of such a question: DIY assembly computer What brand good? In fact, DIY computer machine does not have any brand problems, unless the brand desktop computer. However, think about it, DIY computer contains the CPU, graphics, motherboards, memory, hard disk, chassis, power supply and monitor hardware, each individual DIY hardware is

WAP is a kind of wireless application protocol, which is a global open protocol. WAP defines a common platform for converting information from HTML on the Internet to a WML description of the display on a mobile phone or other handheld device. A variety of networks, that is, it does not rely on some kind of network, to

Daniel, I am sorry, I do not understand PHP, I do Java, because Java also has memcached, I have a certain understanding of Java memcached. Our company is to do a mobile application, the server is PHP to do, but do PHP to improve the efficiency of the static page to do, but the problem came, he put all the logic functions are thrown to the mobile phone to do, main

Before, I did a lot of H5 sharing, but whether it's a broad definition or profound, from this series, I want to start with the definition of H5, and summarize all the content and design methods I know about H5! It's a meaningful thing, and it's a very challenging thing, right here, I hope that if you can patiently read my share of the words must be to my deficiencies and lack of place to make evaluation, let us progress together for this emerging industry efforts! People often ask me