2015 a summary of the development of mobile Internet application software for higher vocational colleges

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Author: User
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1. System Design (slight)

2. Program troubleshooting (slightly)

3. Function coding (can be organized)

UI layout (simple drag layout)

Network communication (JSON)

Normal process: According to the interface to go HTTP request, get JSON, send handler, receive data reflected to the interface.

Common POST Requests

/** * General POST request *  * @param URL *            interface address * @param params *            map Collection of parameters and values * @return JSON string */public static string Generalpost (String URL, map<string, string> params) {HttpPost request = new HttpPost (URL);//Create an HTTP POST request try {Jsono Bject jsonrequest = new Jsonobject (), if (params! = null) {for (String Key:params.keySet ()) {Jsonrequest.put (key, params. Get (key));}} Map-->json-->stringentitystringentity se = new stringentity (jsonrequest.tostring ()); request.setEntity (SE); HttpResponse HttpResponse = new Defaulthttpclient (). Execute (Request); String retsrc = entityutils.tostring (Httpresponse.getentity ()); return retsrc;} catch (Unsupportedencodingexception e) {e.printstacktrace ();} catch (Clientprotocolexception e) {e.printstacktrace ();} catch (ParseException e) {e.printstacktrace (),} catch (Jsonexception e) {e.printstacktrace ();} catch (IOException e) {E.P Rintstacktrace ();} Return "";}

/** * General JSON parsing * *  @param jsonstring   JSON data * *  @param keystring  Return key *             * @return */public String BAC Kjson (String jsonstring, String keystring) {string val = null;try {jsonobject jsonresponse = new Jsonobject (jsonstring); VA L = jsonresponse.getstring (keystring);} catch (Jsonexception e) {//TODO auto-generated catch Blocke.printstacktrace ();} return Val;}

Content push (Notification)

/** * Show notifications in status bar * Plus permissions <uses-permission android:name= "Android.permission.VIBRATE"/> * */private void Shownotifica tion () {//Create a Notificationmanager reference Notificationmanager Notificationmanager = (Notificationmanager) This.getsystemservice (Android.content.Context.NOTIFICATION_SERVICE);//define various properties of NOTIFICATION NOTIFICATION notification = new Notification (r.drawable.ic_launcher, "Test System", System.currenttimemillis ());//Flag_auto_cancel This notification can be cleared by the status bar's Purge button//flag_no_clear the notification cannot be cleared by the status bar's Purge button//flag_ongoing_event notification is placed in the running//flag_insistent Whether it has been performed, such as music has been playing , know user response notification.flags |= notification.flag_ongoing_event; Place this notice in the "ongoing", "running" Group of the notification bar notification.flags |= notification.flag_no_clear; Indicates that this notification is not cleared after clicking "Purge Notification" in the notification bar, and is often used with flag_ongoing_event notification.flags |= notification.flag_show_lights;// Default_all use all default values, such as sound, vibration, splash screen, etc.//default_lights Use default flash hint//default_sounds Use default alert sound//default_vibrate Use default phone shake, add <uses-permissionnotification.defaults = notification.default_lights;//Overlay Effect constantnotification.defaults=notification.default_lights| Notification.default_sound;notification.ledargb = COLOR.BLUE;NOTIFICATION.LEDONMS = 5000; Flash time, milliseconds//Set notification event message charsequence Contenttitle = "test system title"; Notification Bar title Charsequence ContentText = "test system contents"; Notification bar content Intent notificationintent = new Intent (mainactivity.this,mainactivity.class); Click on the notification to jump after the activitypendingintent contentitent = pendingintent.getactivity (this, 0,notificationintent, 0); Notification.setlatesteventinfo (This, contenttitle, contenttext,contentitent);// Pass the notification to notificationmanagernotificationmanager.notify (0, notification);} Delete notification private void Clearnotification () {//Start after delete we define the notification Notificationmanager Notificationmanager = ( Notificationmanager) This.getsystemservice (Notification_service); notificationmanager.cancel (0);}


Data Graph presentation (line chart)

Android paint is commonly used in third-party open source class Library, example: Click to open the link, very easy to use. But estimate the game, not necessarily to open source jar package, so you have to draw, more complex examples: Click to open the link

Local Database (Sqlite)

//Open or create Test.db database Sqlit Edatabase db = Openorcreatedatabase ("Test.db", context.mode_private, NULL);d b.execsql ("DROP TABLE IF EXISTS person");// Create Person Table Db.execsql ("CREATE TABLE person (_id INTEGER PRIMARY KEY autoincrement, name VARCHAR, age SMALLINT)");//entity class Perso n person = new Person ();p erson.name = "John";p Erson.age = 30;//Insert Data db.execsql ("INSERT INTO person VALUES (NULL,?,?)", NE W object[]{person.name, Person.age});//Add, update, and delete//db.executesql (String sql);//db.executesql (String sql, object[) Bindargs);//sql statement, and then the second parameter is the actual parameter set//query data cursor c = db.rawquery ("select * from person WHERE is age >=?", New string[]{"33"}) ; while (C.movetonext ()) {int _id = C.getint (C.getcolumnindex ("_id")); String name = c.getstring (C.getcolumnindex ("name")); int age = C.getint (C.getcolumnindex ("Age")); LOG.I ("db", "_id=>" + _id + ", name=>" + name + ", age=>" + age);} C.close ();//close current database Db.close (); 


2015 a summary of the development of mobile Internet application software for higher vocational colleges

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