android apps for dummies

Why is Android activity thinning out oncreate, OnStart, Onresume, OnPause, OnStop, Ondesdroy so many ways to get apps to reload? Original link: http://blog.csdn.net/zhao_3546/article/details/12843477, reprint Please specify, thank you.Recently in the study activity of the START process, Lao Luo's blog In the Look, also found other information study, also with Android4.3 source code,In the process of code, I

In the previous blog post on related topics, we learned how to use action to start activities outside of the current app to handle our business logic, and in this note I briefly introduce the use of componentname to interact with apps outside the current app.Before introducing component, let us first understand the ComponentName class; ComponentName and intent are located under the Android.content package. We can see it from the

I have talked about the knowledge and technology of Android development. Many may be confused (or even eager to know. Because many of my friends want to make a fortune, and I'm a little excited.) ---- how should I pack and release my own apps, how can I put my apps on the Internet and download them? How can I ensure the security and copyright of my

phone how many applications, loading installed apps, in fact loader can come in handy, see Google on the introduction:Https://developer.android.com/reference/android/content/AsyncTaskLoader.html.PS: By the way, the difference between Asynctaskloader and asynctask, read the source we go back to the summary of the two differences, the following:The most important is to load the data, using loader we do not h

There are three ways to get rid of the title bar in Android, and they have their own characteristics.1. Implement in CodeRemember: This code should be written in front of Setcontentview (). 2. Implemented in the manifest file (manifest.xml)This can be used to set the entire application to no title bar, if only one activity is set to a untitled bar form, as long as the above the third line of code written to a certain activity inside it. 3. Defined in

so on. For example, "*" means matching any class name but does not include the package delimiter, while "* *" matches any class name and includes any number of package delimiters. So the code we commented on above means the following: the first line: all methods that keep all classes under Com.ttdevs.proguard and sub-packages are not confused, and the second row keeps all methods and member variables of the class under Com.ttdevs.proguard and all the classes under the sub-package are not confus

Two applications between the value, in fact, the title is too water, the professional argument is "two process how to pass the value", what?! It's not professional enough, okay, you're kinky! "Interprocess communication" is actually more professional, this time you always satisfied! Incidentally, abbreviated to IPC:inter-process communication. Brothers, if you find this article from search engines or other sources, it means that your Android technolog

-------------------four statesCreate---------------onCreate ()------------Start----------------OnStart ()--------------Resume---------------onresume ()-----------Enter the active stateRestart--------------Onrestart ()------------Pause----------------OnPause ()------------into a paused stateStop-----------------onStop ()-------------Enter the stopped stateDestory--------------ondestory ()----------End stateUse the log class to print:LOG.V (String tag,string text);------Verbose levelLOG.D (String

the outline of a view usingView.setClipToOutLine()Method, orandroid:clipToOutlineProperty. There is only a rectangle, rounded rectangle, and the outline of the circle is clipped and can be usedOutline.canClip()The method detects if the crop is supported.Crop the view to a drawable shape. Sets drawable as the background for the view (the view is displayed on it), and the method is called View.setClipToOutline() .Cropping a view is an expensive operation and does not use shape animation when crop

the flag variable is 1, indicating that a connection was generated.When currentstate-historystae =-1, the state is connected to a break, at which time the flag variable is 0, indicating that a fracture has occurred.Create a function to get the Currentstae:public int getcurrentstate () {return this.manager.getWifiState () = = wifimanager.wifi_state_enabled? 1:0;}Next we modify Mythread's Run method as follows:@Overridepublic void Run () {if (historystate = =-1) {currentstate = Getcurrentstate ()

Android web apps development, the official documentation is as follows: http://developer.android.com/intl/zh-CN/guide/webapps/overview.html. First, I felt that the official Android documentation is getting better and better. To put it bluntly, the web app uses webview for development. If you have time, you must take a good look at this document. The more you lea

Why do Android apps use MulticastSocket to listen for multicast? Why do they connect to different routes and run on different mobile phones? Some of them cannot receive multicast messages. ---------------------------!! Reprinted please indicate the source !! ----------------------- A project that uses Wi-Fi multicast to discover devices in the LAN. However, it is found that some routers can work normally, a

In Android app development, there are occasional exceptions that cause the app being used to be abnormal and forced to shut down, which leads to an unfriendly user experience. To solve this problem, we need to catch the exception and do the processing. There are two kinds of exceptions in Java, namely error and RuntimeException, the former do not need us to deal with, we often deal with the latter. So how do you catch the exception of threads at run t

1, about IconfontIconfont is both icon and font, in particular, it should be displayed in the form of a font icon. Unlike icons in traditional picture formats, this kind of icon is easy to change in size, color, and background color because it is displayed in font form.2. How to use 2.1 Download resourcesResource Source: http://www.androidicons.com/ Follow the guide to find the download link. Download the decompression to find Iconfont/font, the inside of the four files copied to the

compilingcommand line to the project root folder, run: SOURCE build/envsetup.shChoosecombo (select default Direct carriage return)Make-j2 There are also those who say this directly. I don't have a test: Make cleanMakeWhen the compilation is complete, start the virtual machine:./EMULATOR-AVD Androidname-system Out/target/product/generic/system.img Methods for compiling individual modules $.build/envsetup.shMMM packages/ap