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My Android advanced tutorial ------) the intent in the onStartCommand () method of service in android is null

My Android advanced tutorial ------) the intent in the onStartCommand () method of service in android is null Today, when I was maintaining a company APP, a null pointer suddenly went wrong, Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.content.Intent.getBooleanExtra(java.lang.String, boolean)' on a null object reference The following

To be advanced Phper want to read through an open source project source code, should study which is better?

is important to learn the ideas inside rather than the language techniques. According to several open source frameworks that you tag, my personal opinion is as follows: 1. WP: Do not recommend over-study, this blog system used to be good, but also to do business sites, but the source of the use of the design model is particularly special, a large number of glob

Java Advanced Features-annotations, this is perhaps the most simple and understandable article

view ) {try{Method.invoke (activity);} catch (Illegalaccessexception e) {e.printstacktrace ();} catch (InvocationTargetException e) {e.printstacktrace ();}} });}Done! Isn't it simple?We realize the function of Butterknife by using reflection to get annotations, but the article begins with the lack of reflection performance. In fact, Butterknife itself is not a reflection, but the use of apt tools at compile time can get all the methods, fields, and t

Java Advanced Features-annotations, this is perhaps the most simple and understandable article

onClick(View view) { try { method.invoke(activity); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } } });}Done! Isn't it simple?We realize the function of Butterknife by using reflection to get annotations, but the article begins with the lack of reflection performance. In fact, Butterknife itself

Python entry + advanced chapter 1st introduction to Python (it is not too late to start at any time)

Python entry + advanced chapter 1st introduction to Python (it is not too late to start at any time)1. Python Introduction1.1 Python concepts Python /) it is a high-level scripting language that combines interpretation, compilation, interaction, and object-oriented. The Design of Python is highly readable. Compared wit

"Android Advanced" Why do we create activity base class activity what is the general base class method

(); if (network! = null network.isconnectedorconnecting ()) {returntrue;}} return false;} /** * Infer If there is an Internet connection, if not. The Network Settings dialog box pops up. Returns false */@Overridepublic Boolean validateinternet () {Connectivitymanager manager = (Connectivitymanager) Mcontext.getsystemservice (Context.connectivity_service); if (manager = = null) {Openwirelessset (); return false;} else { Networkinfo[] info = manager.g

Javascript is your high-level function (advanced application), javascript high-level

Javascript is your high-level function (advanced application), javascript high-level In common programming languages, function parameters can only be basic types or object references, and return values are only basic data types or object references. However, in Javascript, a function can be passed as a parameter or returned as a return value. A high-order function can take a function as a parameter or a fun

MySQL Query (advanced) (each punctuation is the focus)

. SELECT * from employee,department where employee.dep_id = department.id; The job is to watch the work. This is the same part of extracting two tables. But the different parts aren't left, right? It's going to be a magical thing to use. INNER JOIN : Link to a virtual table with the same portion of two tables as on condition. SELECT * from the employee inner join Department on employee.dep_id

Yii2 is developed, configured, implemented, and tested based on the advanced API interface of the RESTful architecture. yii2restful

Yii2 is developed, configured, implemented, and tested based on the advanced API interface of the RESTful architecture. yii2restfulEnvironment configuration: Enable pseudo-static Server Take apache as an example. Check httpd. conf In the conf directory of apache and find the following code: LoadModule rewrite_module modules/mod_rewrite.so Remove the # above it. If not found, add it. Find the code Change th

AngularJS advanced (34) Angular Data is not updated in a timely manner

AngularJS advanced (34) Angular Data is not updated in a timely mannerAngular Data Update Is Not timely When the control badge is changed correctly, it is found that the front-end code organization level has a serious problem. RootScope

Spring Advanced Tutorial Redefining beans after ApplicationContext initialization is complete

relationship, etc.), followed by spring will not be produced in thin air, and not just for you to host objects, we use Spring is ultimately {new Xxyyzzapplicationcontext (). Getbean (XXYYZZ)}, the contextloaderlistener you defined in Web. XML, or other middleware (struts, etc.)."Everything has its origins. "So if a friend watching this blog is doing unit testing and discovering that auto-injection

Web Service Advanced (vi) Soapbinding binding method exception is not found. You run the APT to generate them

When the appropriate method is populated in the class, the following error is prompted:The reason for the above error is that @soapbinding (STYLE=SOAPBINDING.STYLE.RPC) is not added to the note. The estimate is also related to the JDK version, and this knowledge has time to

Advanced application of entity classes in Windows programs--------------------the state of mind is a realm.

, create a class named Studentdal that defines a method in this class Loadstudentinfo () returns a value type ListMethod of invoking Dal at the BLL layerGets the generic collection returned to the BLL after the UI layerTo use generics as a data source for DGVpublic class Studentextends:student { //One is the account name public string Subjectname {get; set;} Test time public DateTime examdate {get; set;} Result public

There is a development advanced technology called Testing

Many years ago, I worked with a company-recognized expert on projects. A project is a development of a Pocket PC. After writing some components, the experts said to me, "Dude, can you find the bug ?". I took his components and walked several times according to the requirements in the requirement document, saying, "Yes, no problem ". The expert smiled mysteriously. "I know there is a bug. How can I find it?

(Big Data Engineer Learning Path) The second step is to get started with the advanced features of the VIM editor----

document in normal mode Enter :h shiftwidth shiftwidth The open Help file in command line mode Input :ver display version and parameters in command line mode Seven, function set 1.vim function settingCan be set when editing the file function settings, such as the command line mode input :set nu (display number of lines), set value exit Vim will not be saved. To permanently save the configuration, you need to modify the Vim configuration file. Vim configuration file ~/.vimrc , you c

My Android advanced tour ------ & gt; solution to the problem that the item click event cannot be performed when the ListView is nested (ListView) Control in Android, androidlistview

My Android advanced tour ------> solution to the problem that the item click event cannot be performed when the ListView is nested (ListView) Control in Android, androidlistview   During development, you often need to define the Listview by yourself to inherit the BaseAdapter and write it as needed. The problem arises and may not respond when you click every item, cannot obtain the focus. If your custom Lis

The inkjet printer is the most advanced practical technology and concept.

The handheld Inkjet Printer technology is a kind of identification system that integrates the most advanced practical technologies and concepts, data editing and data printing. It not only reflects the ideas and concepts of a new round of industrial reform, in line with industrial development rules, for example, Yu is a high-tech enterprise focusing on R D, prod

----001----Advanced PHP Engineer in technology formation This is the case

The senior PHP engineer is like this1, often read the manual, commonly used functions are familiar with, such as: Time function, array function, file function, MySQL function, GD Library, session. Environment of the independent installation, the commonly used framework will be one to two (THINKPHP,CI).2, familiar with HTTP, TCP/IP and other network communication protocols, PHP interface (json/xml), PHP request Interface (FILE_GET_CONTENTS/CURL).3, fam

What is the advanced programming of Python? This Daniel sums up very in place! Enough for you to use.

A lot of young people who are just getting started or still understanding are going to be in a confused period. is to learn the basics, functions, dictionaries, what, as if you can not do anything, in fact, you have a solid foundation of the words, is able to do a lot of things, learn the basis also don't be confused, because each language is profound, Can not be

This BLOG introduction (there is a UVa524 prime ring advanced edition), uva524 Prime Number

This BLOG introduction (there is a UVa524 prime ring advanced edition), uva524 Prime Number [B001] Hi, everyone. Today, my blog was opened on the first day. Today I have a blog question. It was originally entitled UVa524 by OJ, A affiliated Middle School of Capital Normal University, the requirements are as follows: [Difficulty B] Explain ]--------------------------------------------------------------------

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