content

数据:ContentProvider类

℡╲_俬逩灬. 提交于 2019-12-03 01:33:59
一个程序可以通过实现一个Content provider的抽象接口将自己的数据完全暴露出去,而且 Content providers是以类似数据库中表的方式将数据暴露 。 Content providers存储和检索数据,通过它可以让所有的应用程序访问到,这也是 应用程序之间唯一共享数据的方法 。 要想使应用程序的数据公开化,可通过2种 方法: 1)创建一个属于你自己的Content provider 2)将你的数据添加到一个已经存在的Content provider中,前提是有相同数据类型并且有写入Content provider的权限 从数据共享的角度出发, ContentProvider应该是Android在系统启动时就创建了 ,否则就谈不上数据共享了。 这就要求在AndroidManifest.XML中使用<provider>元素明确定义。 当应用需要通过ContentProvider对外共享数据时,步骤如下: 【1】继承ContentProvider并重写下面方法: public class PersonContentProvider extends ContentProvider{ public boolean onCreate() public Uri insert(Uri uri, ContentValues values) public int delete

android provider 基础介绍

江枫思渺然 提交于 2019-12-03 01:33:31
Android 是如何实现应用程序之间数据共享的 ? 一个应用程序可以创建自己的数据,这个数据对该应用程序来说是私有的,外界更本看不到,也不知道数据是如何存储的,或者是使用 数据库 还是使用文件,还是通过网上获得,这些一切都不重要,重要的是外界可以通过这一套标准及统一的接口和这个程序里的数据打交道,例如:添加 (insert) 、删除 (delete) 、查询 (query) 、修改 (update) 。 android 为我们提供了 ContentProvider 来实现数据的共享,一个程序如果想让别的程序可以操作自己的数据,就定义自己的 ContentProvider ,然后在 AndroidManifest.xml 中注册,其他 application 可以通过获取 ContentResolver 通过 Uri 来操作上一程序的数据。 android 中的电话本等数据就是通过 ContentProvider 实现数据共享的, 系统 中有很多已经存在的共享 Uri 。我们可以使用 ContentResolver 通过 Uri 来操作不同表的数据 ; 如 Contacts.People.CONTENT_URI 什么是 URI? 将其分为 A , B , C , D 4 个部分: A :标准前缀,用来说明一个 Content Provider 控制这些数据,无法改变的 ;"

jQuery tabs: how to create a link to a specific tab?

匿名 (未验证) 提交于 2019-12-03 01:25:01
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: I'm using a simple jQuery script for tabs: The JS: $(document).ready(function() { $(".tab-content").hide(); $("ul.tabs li:first").addClass("active").show(); $(".tab-content:first").show(); $("ul.tabs li").click(function() { $("ul.tabs li").removeClass("active"); $(this).addClass("active"); $(".tab-content").hide(); var activeTab = $(this).find("a").attr("href"); $(activeTab).show(); return false; }); }); The HTML (for the index.html): Top Voters Top Commenters Tab content Some content Tab content Some content Tab content Some content What I

Content type 'text/plain;charset=UTF-8' not supported error in spring boot inside RestController class

匿名 (未验证) 提交于 2019-12-03 01:23:02
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I got the following @RestController inside a spring boot application : @Data @RestController public class Hello { @Autowired private ResturantExpensesRepo repo ; @RequestMapping ( value = "/expenses/restaurants" , method = RequestMethod . POST , consumes = MediaType . APPLICATION_JSON_VALUE , headers = MediaType . APPLICATION_JSON_VALUE ) @ResponseBody public void hello ( @RequestBody ResturantExpenseDto dto ) { Logger logger = LoggerFactory . getLogger ( "a" ); logger . info ( "got a request" ); ResturantExpenseEntity

Why No android.content.SyncAdapter meta-data registering sync-adapter?

匿名 (未验证) 提交于 2019-12-03 01:23:02
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: I am following the SampleSyncAdapter and upon startup, it appears that my SyncAdapter is not configured correctly. It reports an error trying to load its meta-data. How can I isolate the problem? You can see the other accounts in the system that register correctly. Logcat: 12-21 17:10:50.667 W/PackageManager( 121): Unable to load service info ResolveInfo{4605dcd0 com.myapp.syncadapter.MySyncAdapter p=0 o=0 m=0x108000} 12-21 17:10:50.667 W/PackageManager( 121): org.xmlpull.v1.XmlPullParserException: No android.content.SyncAdapter meta-data 12

golang template - how to render templates?

匿名 (未验证) 提交于 2019-12-03 01:11:01
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: One layout template with three children templates. layout.html {{template "tags"}} {{template "content"}} {{template "comment"}} tags.html {{define "tags"}} {{.Name}} {{end}} content.html {{define "content"}} {{.Title}} {{.Content}} {{end}} comment.html {{define "tags"}} {{.Note}} {{end}} gocode type Tags struct { Id int Name string } type Content struct { Id int Title string Content string } type Comment struct { Id int Note string } func main() { tags := &Tags{"Id":1, "Name":"golang"} Content := &Content{"Id":9, "Title":"Hello", "Content":

How to modify dummy content in android master/detail activity?

匿名 (未验证) 提交于 2019-12-03 01:10:02
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: I would modify the items generated by eclipse in the master/detail schema. I can't find a way to do this. In particular I would take the items from an xml (res/values/arrays) resource file. this is the java file: package com.ga.termeapp.dummy; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; public class DummyContent { public static class DummyItem { public String id; public String content; public DummyItem(String id, String content) { this.id = id; this.content = content; } @Override public

Facebook SDK for iOS: FBSDKShareDialog is not shown

匿名 (未验证) 提交于 2019-12-03 00:59:01
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I am a newbie in iOS, and I would like to share a link using the Facebook SDK for iOS. My code's as follows: @IBAction func shareVoucherUsingFacebook ( sender : UIButton ) { print ( "Facebook" ) let content : FBSDKShareLinkContent = FBSDKShareLinkContent () content . contentURL = NSURL ( string : "www.google.com" ) content . contentTitle = "Content Title" content . contentDescription = "This is the description" let shareDialog : FBSDKShareDialog = FBSDKShareDialog () shareDialog . shareContent = content shareDialog . delegate =

Webpack dev server React Content Security Policy error

匿名 (未验证) 提交于 2019-12-03 00:56:02
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: I have my single page app running on webpack-dev-server. I can load and reload my entry route over at localhost:8080 and it works every time. However i can load localhost:8080/accounts/login only via a link from within the app i.e whenever i reload localhost:8080/accounts/login from the browser refresh button i get Cannot GET /accounts/login/ as the server response, and on the console i get Content Security Policy: The page’s settings blocked the loading of a resource at self (“default-src http://localhost:8080 ”). Source: ;(function

JAXB - List&lt;Serializable&gt;?

匿名 (未验证) 提交于 2019-12-03 00:56:02
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: I made some classes using xjc. public class MyType { @XmlElementRefs({ @XmlElementRef(name = "MyInnerType", type = JAXBElement.class, required = false), }) @XmlMixed protected List<Serializable> content; public List<Serializable> getContent() { if (content == null) { content = new ArrayList<Serializable>(); } return this.content; } } But i cant add inner elements using getContent().add(newItem); because MyInnerType is not Serializable. Why its not a List of Objects? How do i add inner elements? 回答1: Please take a look here and here (one