android programming classes

Import android.content.context;import android.util.typedvalue;//Common Unit conversion Auxiliary class public class Densityutils{private Densityutils () {/* cannot be instantiated */throw new unsupportedoperationexception (' cannot be instantiated ');} /** * DP to PX * * @param context * @param val * @return */public static int dp2px (context context, float Dpval) {return (int ) typedvalue.applydimension (Typedvalue.complex_unit_dip,dpval, Context.getresources (). GetDisplayMetrics ());} /** * S

In Android, in general, an application will have dozens of pages, and an application will generally use a specific theme, where the style of the page is consistent, and the page animation effect, page switching effect should also maintain the same style, then need a base class, To complete the basic settings of the page, which is called the base class. Interface Unified management reasons when the interface reaches a certain number of applications, s

generic test class:1 Packagecn.itcast_05;2 3 Public classObjecttooldemo {4 Public Static voidMain (string[] args) {5 //objecttool ot = new Objecttool ();6 //ot.show ("Hello");7 //ot.show (+);8 //Ot.show (true);9 Ten //objecttool One //ot.show ("Hello"); A // - //objecttool - //ot2.show (+); the // - //objecttool - //Ot3.show (true); - + //If you can understand it, it means there's no

Throw NewMyException ("score must be between 0-100");7}Else {8System.out.println ("Score No Problem");9 }Ten } One A //inherit from RuntimeException for MyException - //Public void Check (int score) { - //if (Score > | | Score the //throw new MyException (); - //} else { - //System.out.println ("Score No Problem"); - // } + // } -}1 Packagecn.itcast_08;2 3 ImportJava.util.Scanner;4 5 /*6 * Custom Exception test class7 */8 Public class

("name")). Value (User.getname ()); * Writer.name ("Followers_count"). Value (User.getfollowerscount ()); *Writer.endobject ();* } * * Public voidWritedoublesarray (jsonwriter writer, listthrowsIOException {*Writer.beginarray ();* for(Double value:doubles) {*Writer.value (value);* } *Writer.endarray ();* }View CodeLruCache .With Linkedhashmap* int// 4MiB * new lrucache* protectedint* return* * }}View CodePatterns .Write regular expressions for commonly used

=NewBufferedWriter (NewOutputStreamWriter (Process.getoutputstream ())); Runcmd (writer, cmd); Process.waitfor (); LOG.D ("Runtime", "OnCreate:process.exitValue ()" +Process.exitvalue ()); Result= Process.exitvalue () = = 0; } Catch(Exception e) {//e.printstacktrace ();}finally{closecloseable (writer); if(Process! =NULL) Process.destroy (); } returnresult; } //Close the stream file Private Static voidclosecloseable (closeable ... closeable) { for(inti = 0; i )

An Android activity that has a variety of tool classes built into it. To use, let your activity inherit this activity, all kinds of convenience, easy to understand I wrote a detailed comment on each method, added the network section, added the form file one key to upload Demo diagram Code void Call (java.lang.String number) The method of calling = Telephone void download (java.lang.String URL,

=?", new string[] {ID});Dbmanager.getinstance (). CloseDatabase ();}Add datapublic static void Addcollect (Object obj) {Sqlitedatabase db = Dbmanager.getinstance (). OpenDatabase ();Contentvalues CV = new Contentvalues ();Cv.put ("id", obj.id);Cv.put ("title", Obj.title);Db.insert (tname, NULL, CV);Dbmanager.getinstance (). CloseDatabase ();}Querying datapublic static arraylistSqlitedatabase db = Dbmanager.getinstance (). OpenDatabase ();cursor cursor = db.query (tname, NULL, NULL, NULL, NULL,

. second, The first step is to execute the onresultactivity () function in activity A, regardless of the getactivity () that you used in fragment B. onresultactivity (), or direct use of onresultactivity (). Span style= "font-family:monospace; font-size:14px; White-space:pre-wrap "> If you rewrite the Onactivityresult method of activity a This program only needs to modify my fragment D and jump activity B, do not need to modify activity A, to meet my needs ~ ~ ~Recording.How to impl

In Android, in general, an application will have dozens of pages, and an application will generally use a specific theme, where the style of the page is consistent, and the page animation effect, page switching effect should also maintain the same style, then need a base class, To complete the basic settings of the page, which is called the base class. Interface Unified management reasons when the interface reaches a certain number of applications,

1, can not be left and right sliding Viewpager/* * date:14-7-28 * project:access-control-v2 */package cn.irains.access.v2.common;import android.content.Context; Import Android.support.v4.view.viewpager;import android.util.attributeset;import android.view.motionevent;/** * AUTHOR:MSDX ([email protected]) * time:14-7-28 morning 10:20 */public class Staticviewpager extends Viewpager {public Sta Ticviewpager (Context context) { super (context); } Public Staticviewpager (context conte

mhandler=New Handler () { @Override publicvoid Handlemessage (Message msg) { switch (msg.what) { testhandler.test:+ = msg.arg1; LOG.D ("Progressvalue-------------->", progressvalue+ "");　　　　　　　　　　 Break} }}Elsewhere, a message is sent through the SendMessage () method for the Handlemessage () method to acceptclassMyThreadImplementsRunnable { Public voidrun () { while(!Thread.CurrentThread (). isinterrupted ()) {Message Message=NewMessage (); Mes

In the process of development. We often use log to output logs to help us debug the programBut sometimes it is not enough to satisfy our needs, for example, I want to know which package this log message comes from. Which classSo we encapsulate a log class. Convenient for our useImport Android.util.log;import cn.edu.sdnu.i.smartsdnu.config;/** * This is a Log of the tool class output information source (package name and class name) * Created by Jimbo on 2015 /7/29. */public class Logutils { /*

Define the class to pass, and you must add Public class Implements serializable{}Incoming class: Public void Onitemclick (adapterview parent, intlong id) { Movie Movie= movielist.get (position); New Intent (movieactivity. this, Editmovie. class ); new Bundle (); Bundle.putserializable ("movie", movie); Intent.putextras (bundle); StartActivity (intent); }Accepted classes:Movie movie = (movie)

(Android common UI programming) how to display rich texts in textviewHttp://www.apkbus.com/android-94717-1-1.html (Commonly used Android UI programming) The second set of textview displays emoticon images and textHttp://www.apkbus.com/