Questions tagged as 'java'

Tagged questions
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answers

The app stops when I click on enter

Hello, good evening, I'm trying to login but the app stops when I try to enter the username and password I guess the only thing they need is the java login class: public class Login extends AppCompatActivity { TextView tv_registrar; EditTe...
asked by 12.12.2018 / 07:40
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Read and change line of files in different folders

I will try to explain what I am looking for in a simple and brief way. Taking into account the following folder structure. carpetaPrincipal -> carpeta1 y carperta2 Within carpeta1 and carpeta2 there is a file called t...
asked by 12.12.2018 / 08:11
2
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Print object from an arraylist [duplicate]

When trying to print the list of objects I get the error of java.lang.NullPointerException public Productos(int id, int precio, String nombre) { this.id = id; this.precio = precio; this.nombre = nombre; } public int getId() {...
asked by 11.12.2018 / 19:48
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after end of result set JAVA-MySQL

In the following code I try to make 2 buttons from Arduino send only 1 or 2 and when it reaches java if I press 1 with the help of MySQL it will delete only one number and if I press 2 it will add more products. My doubt is that I can not find w...
asked by 11.12.2018 / 06:49
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Calculate subTotal and Total in a dynamic html and Javascript table

I hope you can help me, I have created a table where I register the item, quantity, unit price and I need you to calculate unit price and assign it to subtotal and then the sum of the subtotals to an input of TOTAL, what I do is search a purchas...
asked by 11.12.2018 / 11:55
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I need to bring a position

I have a recycler view with several cardview and I need a button to open a dialog from which I put a text and edit the textview inside the cardview inside the recycler view. I already have to be able to edit everything but I do not know how to p...
asked by 11.12.2018 / 12:00
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Subtract dates in java

I would like to be able to subtract two dates that I call from a BBDD but the problem that in some cases does not affect me correctly is the time zone @Override public List<Ausentismo> list(Date fechai, Date fechaf, Date fechaMesA, Dat...
asked by 18.12.2018 / 04:27
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Problems downloading PopUp window file in Android Studio

I have an application for android, where I am using WebView to show a web page, from which to download files it shows a popup window (see image) where there are DOWNLOAD buttons to download files, but when pressing DOWNLOAD DO NOT download....
asked by 10.12.2018 / 20:50
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problem when consuming webService

I have made several inquiries and this just does not get anything ... the code of the call to the webService: public SoapObject consultarUsuaris(String tipusUsuari, String authId){ final String metode = "consultarUsuaris...
asked by 11.12.2018 / 15:47
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random numbers not repeated java [duplicated]

Hello, how would you assure that this code did not generate two identical random numbers? is an array of 6 rows and 10 columns to which I assign random numbers from 1 to 1000 int[][] num = new int[6][10]; for(int f=0;f<=5;f++){ fo...
asked by 10.12.2018 / 07:57