android application development tutorial

In the face of a project, I think of three options for Android application Development framework:1. The use of loader + httpclient + Greendao + Gson + Fragment, the advantage is a strong customization, because of the use of Google's own loader and Loadermanager, strong code robustness.The disadvantage is that the whole set of code learning costs are high, the use

This article is to record the relationship between drive layer, HAL layer and application layer in Android development, and its development method, this article will take the LED control as an example to record.One is can be given after their own development to do the refere

);// the width and height values of the fixed clip image //inTent.putextra ("Outputx", 680); //intent.putextra ("OutputY", 480); // to prevent memory limitations and the data returned by each vendor are not uniform, It is not recommended to use this returned data directly, but instead to return the data Urlintent.putextra ("Return-data", false); startactivityforresult (intent,request_code_system_cropper);} @Overrideprotected voidonactivityresult (intrequestcode,intresultcode,intent data) {if (R

username name is in Chinese)Final String Path = "Http://192.168.1.104/Web/servlet/CheckLogin?name=" + urlencoder.encode (name) + "pass=" + Pass;Post mode submit dataThe post submission data is written to the server using a stream. There are two more properties in the protocol header:Content-type:application/x-www-form-urlencoded, describing the mimetype of the submitted dataCONTENT-LENGTH:32, describing the length of the submitted dataAdd post two properties to the request header String data =

Httputils (); Download fileHttp.download (Path,// Target// download the path and file name of the data save true,// whether to support breakpoint continuation true,// If there is no file name in the request address, the file name is in the response header and is automatically renamed after the download is complete NewRequestcallback// listening for download status// callback after successful download@Override Public voidOnsuccess (responseinforesponseinfo) {Toast.maketext

Android Network application development, there are mainly two ways, one is socket (is the encapsulation of the TCP/UDP Protocol), the other is the use of HTTP protocol, Android is mainly provided in two ways, HttpURLConnection and Apache HttpClient. The following is a detailed description of the

This article mainly introduces detailed information about the application number development tutorial. For more information, see the following article, for more information, see Application number (the new name of "application number" for the public platform applet) has f

Android.content.context;public class MyApplication extends application {private static final String VALUE = "Jay";p rivate String value;private static Context C Ontext; @Overridepublic void OnCreate () {super.oncreate (); SetValue (VALUE);//Initialize global variable context = Getapplicationcontext () ;//Get Global context}public void SetValue (String value) {this.value = value;} Public String GetValue () {return value;} public static Context GetCont

In Android Application Development, we do not want users to directly press the back key to exit the activity, but hide the application to the background, similar to pressing the Home Key. Provided belowCodeFor more information, see. Public BooleanOnkeydown (IntKeycode, keyevent event ){If(Keycode = keyevent. keycod

Size Units (px, dpi, dp, dip, and sp) of the View for android Application Development, and androiddpi I. pixel (px) and screen resolution 1) px (Pixels, Pixels): corresponds to the actual Pixels on the screen. For example, 320*480 screens have 320 pixels horizontally and 480 pixels vertically. 2) the screen resolution is the total number of physical pixels displa

Improved to proficient in Mobile (android, IOS) App application service program development 6.2 development ImprovementPlease refer toDevelopment ManualBasic label language and Expression in 6.3 proficient in mobile App application service program developmentFamiliar with li

I call it?Browser.addjavascriptinterface (This, "Android"); Browser is the WebView object.On the page UploadFile () is a method of the called activity, which essentially opens the selection dialog, the same process as the first method. Just return the file path and upload it yourself.The new version of Android system is ready, and there is a problem: in android2.3 and other versions have a bug, the method

After you create an Android app project, start debugging directly and discover that visual Studio Emulator for Android has run successfully, but the app is always in build (wait longer than 1 hours) and is not deployed to the emulator as expected via ADB. Export the app directly to the APK and drag it to the simulator to deploy directly, prompting:File transfer failed. Error:unable to install the file throu

Creating a Database Android does not automatically provide a database. Using SQLite in an Android application, you must create your own database, and then create tables, indexes, and fill data. Android provides sqliteopenhelper to help you create a database, and you can easily create a database just by inheriting the

application directory:Compiled header file:/* Don't EDIT this file-it are machine generated */#include C's Code implementation:#include Code as shown above, you can according to the above INotify introduction and code in the comments, the implementation of the code is basically not difficult, but understand the implementation of the principle of a good understanding of the inotify implementation mechanism, so as to be more effective AH.Java layer cod

AppleWatch Development Tutorial Watch Application Object new introduction and writing run code add Watch app object when new content introducedWhen the Watch app object is added to the created project, it contains two parts: Watch app and WatchKit extension,2.18. Where the Watch app is part of the user's iwatch, it is so far only allowed to contain storyboard fil

A book I've been reading recently is the authoritative guide to Android Application Development (fourth edition), which is highly recommended. The book describes some of the user interface design specifications, for beginners I think it is very necessary, here the code to everyone, hope for us all useful. When we design our user interface, we always support speci

One, the Toast in Android　　A simple message prompt box.When the view is displayed to the user, it is displayed as floating in the application.　　Unlike dialog, it never gets the focus and cannot be clicked.　　The user will probably type something else in the middle.　　The idea of a toast class is to be as unobtrusive as possible, while also displaying information to the user in the hope that they will see it.