Home / user-226495

el.trasgu's questions

Martin Hope
el.trasgu
Asked: 2022-10-24 15:29:40 +0800 CST
  • 0

Let's see if someone can enlighten

I've been messing around all day with how to change an image when clicking on another using javascript, but when calling an element of the document, it throws me the null value

I have the id = "OneOne" in the image of the HTML document;

When clicking on it, through the onclick event, I send the id of the image and the position it occupies as a parameter, in this case it would be "UnoUno" and "0"

In the function that receives the onclick event I try to reference the image I clicked on to change it to another, and I always receive null

let ele = "#" + elemento; //resultado: "#UnoUno"
let control = document.getElementById(ele); //control: null

I've been with this error for a few hours, I've searched, read, reread and I can't find the error that I'm causing

What am I doing wrong?

Part of the affected HTML file:

 <body>
     <main>
         <section class="section">  
              <table class="table">
                 <tr>
                     <td>
                         <img id = "UnoUno" class="img" src="./img/reverso.png" alt="imagen11" onclick="abrirImagenClick('UnoUno', '0')">
                     </td>
                 </tr>
             </table>
         </section>
     </main>
 </body>

Part of the affected CSS file

.table tr td img:hover
{
    border: 3px solid #fe0101;
}

.img
{
    height: 150px;
    width: 110px;
}

Affected part of javascript file

//recibo por parámetro con el evento onclick, el elemento cliqueado y la posición que ocupa
function abrirImagenClick(elemento, posicion)
{
    //variable que concatena el elemento con la almohadilla
    let ele = "#" + elemento;
    //variable que debería de almacenar el elemento del documento donde deseo cambiar la imagen
    //pero me devuelve null
    let control = document.getElementById(ele);
    imagen = document.createElement("img");

    imagen.src = "img/" + barajaBarajada[posicion];

    //control.appendChild(imagen);
}
javascript
Martin Hope
el.trasgu
Asked: 2022-08-02 15:01:17 +0800 CST
  • 4

There is no way to find the solution

Thanks to @JorgeSys, I was able to resolve a question with the Timer and fortunately I have been able to solve that part of my code

Now my question is the following:

I have a for loop for the series

I have a for loop for repeats per series

Inside this loop, I would like to have the duration of the exercises and...

The duration of the rests between repetitions

my code is more or less the following

//bucle series
for (int i = 0; i < numSeries; i++) {
        //bucle repeticiones
        for (int j = 0; j < numRep; j++) {
            //instancio primer Timer y ejecuto
            timeSerie = new Timer();
            timeSerie.schedule(new TimerTask() {
                public void run() {

                    //descontamos 1 a la variable que contiene la duración
                    midTimeSerie--;
                    //calculamos los segundos
                    long ssSerie = midTimeSerie % 60;

                    //si los segundos son igual a 0
                    if (ssSerie == 0) {
                        //la variable coge la duración del ejercicio
                        midTimeSerie = segundosEjer;
                        //cancelamos el Timer actual
                        timeSerie.cancel();
                        //borramos el contenido del TextView
                        txtRelojEjer.setText("");
                    }
                    //si los segundos entan entre 9 y 1
                    else if ((ssSerie < 10) && (ssSerie > 0)) {
                        //escribimos los segundos en el TextView
                        txtRelojEjer.setText("00:0" + ssSerie + "");
                        //reproducimos un sonido
                        toneG.startTone(ToneGenerator.TONE_DTMF_0, 80);
                    }
                    else {
                        //escribimos los segundos en el textView
                        txtRelojEjer.setText("00:" + ssSerie + "");
                    }
                }
            //iteramos cada segundo
            },1000);

            midTimeDescanso = segundosDescEjer;
            timeDescanso = new Timer();
            timeDescanso.schedule(new TimerTask() {
                public void run() {

                    midTimeDescanso--;
                    long ssDescanso = midTimeDescanso % 60;

                    if (ssDescanso == 0) {
                        midTimeDescanso = segundosDescEjer;
                        timeDescanso.cancel();
                        txtRelojDesc.setText("");
                    }
                    else if ((ssDescanso < 4) && (ssDescanso > 0)) {
                        txtRelojDesc.setText("00:0" + ssDescanso + "");
                        toneG.startTone(ToneGenerator.TONE_DTMF_0, 80);
                    }
                    else {
                        txtRelojDesc.setText("00:" + ssDescanso + "");
                    }
                }
            },1000);
        }
    }

But instead of executing the code of the first Timer, and carrying out the programmed process to then move on to the second Timer once the first one has finished, it executes the two Timers at the same time.

Could someone tell me how to make a complete Timer corresponding to the exercise, and once finished, move on to the second Timer corresponding to the rest?

Once the two Timers have finished, it would return to the For loop to continue with the number of repetitions.

At the end of the repetitions and its rests, it would go from the second loop to the first, which would go back for another loop as long as there are still sets.

edited

I am now with the following method, in it, more or less I have what I want except for several errors that I cannot solve

1 - I don't understand why in the first timer, when it reaches 9 it stops

2 - I don't understand why in the second timer, when it reaches 50 it stops

Despite having the timers in two for loops with multiple iterations, only one is performed.

Nor can I get inside the CountDownTimer when trying to debug the code, because it skips all the code that is inside the entire timer.

Can someone clarify my doubts?

I import the array data from another activity:

    serie[0] = txtNombreSerie.setText("Regletas");
    serie[1] = spiNumeroSeries.setSelection(3);
    serie[2] = spiDescansoMSeries.setSelection(3);
    serie[3] = spiDescansoSSeries.setSelection(0);
    serie[4] = spiNumeroRepeticiones.setSelection(5);
    serie[5] = spiTiempoMRepeticiones.setSelection(0);
    serie[6] = spiTiempoSRepeticiones.setSelection(10);
    serie[7] = spiDescansoMRepeticiones.setSelection(0);
    serie[8] = spiDescansoSRepeticiones.setSelection(50);

method with the two loops and the two timer

private void metodoIniciarSerie(String[] serie) {

    String nombreSerie = serie[0];
    int numSeries = Integer.parseInt(serie[1]);
    int numMSeries = Integer.parseInt(serie[2]);
    int numSSeries = Integer.parseInt(serie[3]);
    int numRep = Integer.parseInt(serie[4]);
    int tiempoMRep = Integer.parseInt(serie[5]);
    int tiempoSRep = Integer.parseInt(serie[6]);
    int numMRep = Integer.parseInt(serie[7]);
    int numSRep = Integer.parseInt(serie[8]);

    int segundosEjer = ((tiempoMRep * 60) + tiempoSRep);
    int segundosDescEjer = ((numMRep * 60) + numSRep);
    int segundosDescSerie = ((numMSeries * 60) + numSSeries);

    int segundosDesSeries = segundosDescSerie - segundosDescEjer;
    contador = segundosEjer;

    long tiempoEntreTicks = 1000; //un segundo
    long duracionTotal = segundosEjer * 1000; //milisegundos

    long duracionTotalD = segundosDescEjer * 1000; //milisegundos

    for (int i = 0; i < numSeries; i++) {

        for (int j = 0; j < numRep; j++) {

            CountDownTimer ejercicio = new CountDownTimer(duracionTotal, tiempoEntreTicks) {
                public void onTick(long milisegHastaFin) {
                    long segundosPasados = (duracionTotal + milisegHastaFin) / 1000;

                    int m = (int) segundosPasados / 60;
                    int s = (int) segundosPasados % 60;

                    txtDetalleEjer.setText("Trabaja Ejercicio");
                    txtDetalleDesc.setText("");
                    txtRelojEjer.setText(String.format("%02d:%02d", m, s));
                    if ((m == 0) && (s < 11) && (s > 0)) {
                        toneG.startTone(ToneGenerator.TONE_DTMF_0, 80);
                    }
                    else if ((m == 0) && (s == 0)) {
                        toneG.startTone(ToneGenerator.TONE_DTMF_0, 800);
                    }
                }

                public void onFinish() {
                    txtRelojEjer.setText("00:00");

                    CountDownTimer start = new CountDownTimer(duracionTotalD, tiempoEntreTicks) {
                        public void onTick(long milisegHastaFinD) {
                            long segundosPasadosD = (duracionTotalD + milisegHastaFinD) / 1000;

                            int md = (int) segundosPasadosD / 60;
                            int sd = (int) segundosPasadosD % 60;

                            txtDetalleDesc.setText("Descansamos");
                            txtDetalleEjer.setText("");
                            txtRelojDesc.setText(String.format("%02d:%02d", md, sd));

                            if ((md == 0) && (sd == 10)) {
                                toneG.startTone(ToneGenerator.TONE_DTMF_0, 80);
                            }
                            else if ((md == 0) && (sd < 4) && (sd > 0)) {
                                toneG.startTone(ToneGenerator.TONE_DTMF_0, 80);
                            }
                            else if ((md == 0) && (sd == 0)) {
                                toneG.startTone(ToneGenerator.TONE_DTMF_0, 800);
                            }
                        }

                        public void onFinish() {
                            txtRelojDesc.setText("00:00");
                        }
                    }.start();
                }
            }.start();
        }
    }
}

Thank you

java
Martin Hope
el.trasgu
Asked: 2022-07-27 07:25:01 +0800 CST
  • 3

I have the following code for a Timer that counts down from 3 seconds

The problem is that it feeds back over and over again and I don't see a way to stop it.

Can someone explain to me how it works and why the "timer3.cancel()" statement doesn't work?

//método de cuenta atrás
private void time3() {
    //instancio el Timer
    timer3 = new Timer();
    
    timer3.schedule(new TimerTask() {
        //inicia el timer
        public void run() {

            //al valor inicial de la variable, que he puesto en 4, le descuento 1
            midTime3--;
            //calculo la operación para trabajar en segundos
            long ss3 = midTime3 % 60;

            //si el segundo es cero
            if (ss3 == 0) {
                //borro el texto del textView
                txtRelojEjercicio2.setText("");
                //Vuelvo a darle el valor de 4 a la variable, pues se volverá a llamar al método en breve
                midTime3 = 4;
                //cancelo en Timer3 en marcha
                //lo que deseo es detener el Timer hasta que que vuelva a ser llamado el método
                timer3.cancel();
            }
            //si el segundo está entre 4 y 1
            else if ((ss3 < 5) && (ss3 > 0)) {
                //escribo la cuenta atrás en el TextView
                txtRelojEjercicio2.setText("00:0" + ss3 + "");
            }
        }
    //argumentos del timer para que se ejecute cada segundo
    }, 0, 1000);
}

I want to stop the timer, but it restarts over and over again

Can someone shed some light on this for me?

Thank you

java
Martin Hope
el.trasgu
Asked: 2022-07-15 09:21:34 +0800 CST
  • 0

I've been on this issue for a few days and I can't find a solution.

I tried it first with a class and also with different methods, but I don't quite understand how it works

My intention is to ask the user to indicate the time to start the countdown

I want to use a TimePickerDialog, but this one that I use in particular, only asks for hours and minutes, which by the way, the hours do not let me put 0, and it does not let me put seconds, only minutes. Well, or I don't know how they would wear.

I wish I could select the hours, minutes and seconds.

Collect the three data in three variables and send them to a TextView

TimePickerDialog method:

private void metodoSolicitarTiempo(){
    TimePickerDialog timePickerDialog = new TimePickerDialog(PaginaTemporizador.this,
            new TimePickerDialog.OnTimeSetListener() {

                @Override
                public void onTimeSet(TimePicker view, int hourOfDay,
                                      int minute) {
                    //horas es el textview donde deseo ver el dato que retorna
                    //ésto funciona, pero aunque ponga 0 horas, siempre aparece 1
                    //también desearía ver los segundos
                    Horas.setText(hourOfDay + ":" + minute);
                }
            }, horas, minutos, false); //ésta parte no la entiendo. Las variables horas y minutos son de tipo int, pero no entiendo porque las hay que colocar y para qué
    timePickerDialog.show();
}

This is the method that starts the Timer:

public void IniciarCuenta(){

    //Esta parte la utilizaba antes con otro método que pedía horas, minutos y segundos de forma manual por medio de Edittext, ahora no lo utilizo
    //segundos = (Integer.parseInt(Segundos.getText().toString()) + (Integer.parseInt(Minutos.getText().toString()) * 60) + ((Integer.parseInt(Horas.getText().toString()) * 60) * 60));

    //Lo que trataría de hacer, sería pasar a segundos las tres variales retornadas por el método anterior

    new CountDownTimer(segundos * 1000 + 1000, 1000) {

        public void onTick(long millisUntilFinished) {
            segundos = (int) (millisUntilFinished / 1000);

            //Con éstos cálculos mezclo un poco métodos que fui utilizando
            //si ahora me llegaran las variables con cada dato de forma individual, algunos de éstos cálculos estaría de más
            int horas = segundos / (60 * 60);
            int tempMint = (segundos - (horas * 60 * 60));
            int minutos = tempMint / 60;
            segundos = tempMint - (minutos * 60);
            int tempSeg = ((segundos - (horas * 60 * 60))) - (tempMint - (minutos * 60)) - segundos;
            miliSegundos = tempSeg / 60;

            //Aqui relleno el cuadro de texto con las variables resultantes de los cáculos nateriores donde se va viendo la cuenta atrás en el reloj
            txtCronoT.setText(String.format("%02d", horas)
                    + ":" + String.format("%02d", minutos)
                    + ":" + String.format("%02d", segundos)
                    + ":" + String.format("%02d", miliSegundos));
        }

        public void onFinish() {
            txtCronoT.setText("Finalizado");
        }
    }.start();
}

It would be possible for you to explain to me how the TimePickerDialog method works, and if there is the possibility of requesting the seconds and setting the hours to 0.

I would also like to see the thousandths of a second on the clock and it would also be possible.

Regards, and thank you very much

java
Martin Hope
el.trasgu
Asked: 2022-06-12 13:12:33 +0800 CST
  • 0

I have the following code to draw on a JFrame

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.geom.Line2D;
import java.util.ArrayList;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class VentanaDisposicionMesas extends JComponent implements ActionListener{

    static JFrame frmPrincipal;

    private Point inicioArrastre;
    private Point finArrastre;
    private ArrayList lineas = new ArrayList();

    JButton btnGuardar;
    JButton btnCerrar;

    JPanel pnlBotones;

    public VentanaDisposicionMesas() {
        super();
    
        metodoCargarPanel();
    
        addMouseListener(new MouseAdapter() {

            public void mousePressed(MouseEvent e) { // cuando se presiona el mouse
                inicioArrastre = new Point(e.getX(), e.getY());
                repaint();
            }

            public void mouseReleased(MouseEvent e) { // cuando se deja de presionar el mouse
                finArrastre = new Point(e.getX(), e.getY());
                Shape linea = crearLinea(inicioArrastre.x, inicioArrastre.y, finArrastre.x, finArrastre.y);
                lineas.add(linea);
                repaint();
            }
        });
        addMouseMotionListener(new MouseMotionAdapter() {

            public void mouseDragged(MouseEvent e) { // cuando se esta arrastrando el mouse
                finArrastre = new Point(e.getX(), e.getY());
                Shape linea = crearLinea(inicioArrastre.x, inicioArrastre.y, finArrastre.x, finArrastre.y);
                lineas.add(linea);
                inicioArrastre = new Point(finArrastre.x, finArrastre.y);
                repaint();
            }
        });
    }

    public void paint(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        g2.setColor(Color.RED);
        for (Object linea : lineas) { 
            g2.draw((Shape) linea);
        }
    }

    private Line2D.Float crearLinea(int x1, int y1, int x2, int y2) {
        return new Line2D.Float(x1, y1, x2, y2);
    }

    public static void main(String[] args) {
        JFrame ventana = new JFrame("Ejemplo para la Disposición de Mesas");

        ventana.setSize(600, 400);
        ventana.setLocationRelativeTo(null);
        ventana.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        ventana.add(new VentanaDisposicionMesas());
        ventana.setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent ae) {
        if (ae.getSource() == btnCerrar){
            this.setVisible(false);
        }
        else if (ae.getSource() == btnGuardar){
            ;
        }
    }

    private void metodoCargarPanel() {
        pnlBotones = new JPanel();
        pnlBotones.setBounds(0, 550, 400, 30);
        this.add(pnlBotones);
    
        btnCerrar = new JButton("Cerrar");
        btnCerrar.addActionListener(this);
        btnCerrar.setBounds(50, 15, 150, 15);
        pnlBotones.add(btnCerrar);
    
        btnGuardar = new JButton("Cerrar");
        btnGuardar.addActionListener(this);
        btnGuardar.setBounds(205, 15, 150, 15);
        pnlBotones.add(btnGuardar);
    }
}

It works fine for me, but now I try to add the panel with the two buttons, and I have not succeeded in any way.

I have tried adding the buttons to this.add(btnClose); but it does not work

I have tried to make another JFrame and add this one from the drawing to the previous one, but I have not been able to

if I try to add it with the name of the JFrame (window.add();) it gives me an error

I'm starting with the subject of Java Swing, and I don't understand it very well, can someone enlighten me a bit on the way?

on the other hand, would it be possible to save the drawing made in the JFrame as an image? That would be the function of the save button

Regards, and thank you very much

java
Martin Hope
el.trasgu
Asked: 2022-05-14 04:48:18 +0800 CST
  • 0

I am trying to add a JMenuBar using the GridBagLayout organizer, and am unable to do so.

Could someone explain to me how to do it?

I have a basic exercise where I have added label and buttons for testing. So far, I have no problems, but when it comes to adding the menu bar, I get lost.

This is my code:

public class ClaseGridBagLayout extends JFrame implements ActionListener{

    GridBagLayout admin = new GridBagLayout();
    GridBagConstraints subLayout;
    

    //instancio el menú
    JMenuBar miMenu;
        JMenu mArchivo;
            JMenuItem iCopiar;
            JMenuItem iPegar;
        JMenu mAyuda;
            JMenuItem iAyuda;

    //instancio los label del ejercicio
    JLabel lblTitulo;
    JLabel lblFila1Dos;
    JLabel lblFila2Uno;
    JLabel lblFila2Tres;
    JLabel lblFila3Dos;

    //instancio los botones del ejercicio
    JButton btnFila1Uno;
    JButton btnFila1tres;
    JButton btnFila2Dos;
    JButton btnFila3Uno;
    JButton btnFila3Tres;

    JButton btnCerrar;

    //cnstructor de la clase
    public ClaseGridBagLayout(){
        super(" La clase ClaseGridBagLayout");
    
        //creo los distintos métodos
        metodoCargarConfiguracion();       
        metodoCargarIconos();        
        metodoCargarMenu();        
        metodoCargarComponentesPasivos();        
        metodoCargarComponentesActivos();
    
        //le doy la medida necesaria para los elemtos que se carguen
        pack();
        //lo hago visible
        setVisible(true);
    }

    //como ejemplo le doy función al botón cerrar
    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == btnCerrar){
            System.exit(0);
        }
    }

    //aquí cargo la configuración general con el controlador GridBagLayout
    private void metodoCargarConfiguracion() {
        this.getContentPane().setLayout(new GridBagLayout());
    
        //creo el gestor para las posiciones en pantalla
        subLayout = new GridBagConstraints();
    
        setLookAndFeel();
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    private void metodoCargarIconos() {
    
    }

    //cargo label y los posiciono por la ventana
    private void metodoCargarComponentesPasivos() {
    
        lblTitulo = new JLabel("Título");
        subLayout.gridx = 0;
        subLayout.gridy = 1;
        subLayout.weightx = 1;
        subLayout.weighty = 1;
        this.getContentPane().add(lblTitulo, subLayout);
    
        lblFila1Dos = new JLabel("1 - 2");
        subLayout.gridx = 2;
        subLayout.gridy = 2;
        subLayout.weightx = 1;
        subLayout.weighty = 1;
        this.getContentPane().add(lblFila1Dos, subLayout);
    
        lblFila2Uno = new JLabel("2 - 1");
        subLayout.gridx = 1;
        subLayout.gridy = 3;
        subLayout.weightx = 1;
        subLayout.weighty = 1;
        this.getContentPane().add(lblFila2Uno, subLayout);
    
        lblFila2Tres = new JLabel("2 - 3");
        subLayout.gridx = 3;
        subLayout.gridy = 3;
        subLayout.weightx = 1;
        subLayout.weighty = 1;
        this.getContentPane().add(lblFila2Tres, subLayout);
    
        lblFila3Dos = new JLabel("3 - 2");
        subLayout.gridx = 2;
        subLayout.gridy = 4;
        subLayout.weightx = 1;
        subLayout.weighty = 1;
        this.getContentPane().add(lblFila3Dos, subLayout);
    }

    //cargo botones y los posiciono por la ventana
    private void metodoCargarComponentesActivos() {
    
        btnFila1Uno = new JButton("1 - 1");
        subLayout.gridx = 1;
        subLayout.gridy = 5;
        subLayout.weightx = 1;
        subLayout.weighty = 1;
        this.getContentPane().add(btnFila1Uno, subLayout);
    
        btnFila1tres = new JButton("1 - 3");
        subLayout.gridx = 3;
        subLayout.gridy = 5;
        subLayout.weightx = 1;
        subLayout.weighty = 1;
        this.getContentPane().add(btnFila1tres, subLayout);
    
        btnFila2Dos = new JButton("2 - 2");
        subLayout.gridx = 2;
        subLayout.gridy = 6;
        subLayout.weightx = 1;
        subLayout.weighty = 1;
        this.getContentPane().add(btnFila2Dos, subLayout);
    
        btnFila3Uno = new JButton("3 - 1");
        subLayout.gridx = 1;
        subLayout.gridy = 7;
        subLayout.weightx = 1;
        subLayout.weighty = 1;
        this.getContentPane().add(btnFila3Uno, subLayout);
    
        btnFila3Tres = new JButton("3 - 3");
        subLayout.gridx = 3;
        subLayout.gridy = 7;
        subLayout.weightx = 1;
        subLayout.weighty = 1;
        this.getContentPane().add(btnFila3Tres, subLayout);
    
        btnCerrar = new JButton("Cerrar");
        btnCerrar.addActionListener(this);
        subLayout.gridx = 2;
        subLayout.gridy = 8;
        subLayout.weightx = 1;
        subLayout.weighty = 1;
        this.getContentPane().add(btnCerrar, subLayout);

    }

    //método principal
    public static void main(String[] args){
        ClaseGridBagLayout miClase = new ClaseGridBagLayout();
    }

    //método sin función con el diseño por defecto
    private void setLookAndFeel() {
        try{
            UIManager.setLookAndFeel("");
        }
        catch (Exception e){
        
        }
    }

    //aquí intento cargar el menú sin éxito
    private void metodoCargarMenu() {
    
        //creo la barra de menús
        miMenu = new JMenuBar();
    
        //creo el menú y sus item
        mArchivo = new JMenu();
            iCopiar = new JMenuItem();
            iPegar = new JMenuItem();
        mAyuda = new JMenu();
            iAyuda = new JMenuItem();
    
    
        //agrego el menú a la barra
        miMenu.add(mArchivo);
        miMenu.add(mAyuda);

        //agrego los item al menú
        mArchivo.add(iCopiar);
        mArchivo.add(iPegar);
        mAyuda.add(iAyuda);
    
        //agrego la barra al panel principal, pero no se como agregarlo al constraint del GridBagLayout. La verdad, no tengo idea de como se ha de hacer
        this.setJMenuBar(miMenu);
        subLayout.gridx = 0;
        subLayout.gridy = 0;
        subLayout.weightx = 1;
        subLayout.weighty = 1;
        this.getContentPane().add(miMenu, subLayout);

    }
}

The truth is that I'm a bit lost with this topic of the bar, different tests and none of them work.

I've tried adding a JPanel, and a layout inside the JPanel, adding the bar to the layout, but I can't do it either.

//creo el panel
JPanel fila1 = new JPanel();
//creo el gestor de la ventana del panel
GridLayout f1 = new GridLayout(2, 1);

//agrego el menú al gestor del panel
fila1.add(miMenu);
//agrego el gestor al panel
fila1.setLayout(f1);
//agrego el panel al panel principal GridBagLayout gestionado por el constraint subLayout;
this.getContentPane().add(fila1, subLayout);

Could someone give me light on this?

java
Martin Hope
el.trasgu
Asked: 2022-09-10 11:25:12 +0800 CST
  • 3

A few days ago, a user asked how to calculate the age in the Linux Bash shell

Once the question was answered, he told me if they could not calculate, in addition to the age in years, the months and days.

I have done the exercise in Java, and due to the short time available, I have not yet been able to adapt it to the command interpreter, I am working on it

The question came with its code and asked how to complete it, I have translated it into Java and it has seemed interesting enough to publish it in this language

It could be done with methods and in many fewer lines, but the fun is in doing it without shortcuts

public static void main(String[] args){
    Scanner teclado = new Scanner(System.in);
    
    System.out.println("Ingrese su año de nacimiento");
    int a = teclado.nextInt();
    System.out.println("Ingrese su mes de nacimiento");
    int m = teclado.nextInt();
    System.out.println("Ingrese su dia de nacimiento");
    int d = teclado.nextInt();
            
    Date date = new Date();
    LocalDate localDate = date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
    int anio = localDate.getYear();
    int mes = localDate.getMonthValue();
    int dia   = localDate.getDayOfMonth();

    int day = dia - d;
    int year = anio - a;
    int month = mes - m;

    int MES = month + 12;

    if (m > mes){
        System.out.println("Tiene " + year + " años");
        System.out.println("Con " + MES + " meses");
        System.out.println("Con " + day + " dias");
    }else{
        System.out.println("Tiene " + year + " años");
        System.out.println("Con " + month + " meses");
        System.out.println("Con " + day + " dias");
    }
}
java
Martin Hope
el.trasgu
Asked: 2022-08-01 19:45:43 +0800 CST
  • 1

A few days ago a community user asked this question, and once I answered it, he decided to delete it.

Since it had taken me some time to craft the answer to get the code to work, I'm taking the liberty of reposting the question and my answer.

The question was the following:

Good day. Could someone please help me with this error, I have to get a percentage from a range of numbers. I get the count correctly, but the arithmetic doesn't work for me to get the percentage.

public class Ej08 {
    public static void main(String[] args) throws Exception {
       int n;
       int suma=0;
       int bajo=0;
       int inv=0;
       float num;
       double mbajo= 5.0;
       float mybajo= 14;
       double minv= 80.0;
       float myinv= 100;
       int i;
       java.util.Scanner lea = new java.util.Scanner(System.in);
       System.out.print("Indique la cantidad de numeros : ");
       n = lea.nextInt();
       if(n<=0)
           System.out.println("El valor no es valido");
       else {
           for(i=1;i<=n;i++) {
               System.out.print("Dato "+i+" : ");
               num=lea.nextFloat();
               suma += num;
               if(num> mbajo && num<=mybajo){
                   bajo= bajo + 1;
                   System.out.println(" sumo "+ num);

               }
               if(num> minv && num <= myinv){
                   inv= inv + 1;
                   System.out.println(" sumo "+ num);
                
               }
           }
           System.out.println("bajo trae: "+bajo);
           System.out.println("inviable tre: "+inv);
           System.out.println("n trae: "+n);
           double prom= (suma/(n*1.0));
           float pb=(bajo /n)*100;
           float pi=(inv / n)*100;
        
           /* if (prom>=01){
               5.1 7 25 70 50 90
           }*/
        
           System.out.println("El promedio de los números es : "+prom);
           System.out.println("bajo: "+pb);
           System.out.println("inviable: "+pi);
       }
       lea.close();

In the code you can see that the low variable brings 2 and the inv variable brings 1 and the n variable brings 6 which is the number of times the program reads.

I need to know how much is under n, that is, how much is 2 of 6 is simple, it is divided and multiplied by 100, but it does not perform the operation because in the end pb and pi have 0.0 as a result

java
Martin Hope
el.trasgu
Asked: 2022-08-01 16:53:35 +0800 CST
  • 0

I think they had published this question yesterday

How to evaluate that the received data is decimal without using an exception and that these data, which are two values ​​A and B, are between the following ranges:

A value between -150 and 150

B value between -100 and 100

Today I started working on it and after having achieved the code that evaluated it, when I started to publish the answer, I found that it had been deleted by the author

So taking advantage of the fact that I already had the code, I will answer myself

c#
Martin Hope
el.trasgu
Asked: 2022-06-24 14:55:28 +0800 CST
  • 1

It is something that I have questioned since I began to study programming, that I have even asked two professors, and one without answering changed the subject because, according to what he said, it was not the time to explain it, and the other told me that it was for reasons of speed up access, but it is not very clear to me

Does anyone know the reason why, once a complete class has been imported, for example:

import java.util.*;

In the same program, we find the following additional imports ?

import java.util.ArrayList;
import java.util.Scanner;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

When I started my studies, they explained to me that with the asterisk the entire class and sub-classes are imported, however it is common to find total and partial imports

Can someone explain it to me ?

Because searching the internet I have seen little information about it and very ambiguous

Regards, and thank you very much

java
Martin Hope
el.trasgu
Asked: 2022-06-12 16:30:33 +0800 CST
  • 3

Today I had an exam question in which I was asked for the following restrictions for a code that was requested by keyboard:

  • It must have 9 characters, of which:
    • The first has to be a number
    • The second has to be a script
    • The next 7 remaining characters have to be numbers

The code is requested three times, stored and displayed at each iteration

In the exam I did not know how to do it, and now at home I have done it in the following way that I think works:

public class RestringirEntradaTeclado {

    public static void main(String[] args){
        //instanciamos la clase Scanner para pedir el código
        Scanner teclado = new Scanner(System.in);
        //creamos un string para recoger dicho código
        String codigo;
        //creamos dos contadores, para el bucle del pedido y de los caracteres
        int contador = 0, pedido = 1;
        //creamos un ArrayList para almacenar los códigos
        ArrayList<String> catalogo = new ArrayList<String>();
    
        //mientras haya menos de tres pedidos, repetir
        while (pedido <= 3){
            //pedimos el código
            System.out.println("Introduzca el código: ");
            //recogemos el código en la variable
            codigo = teclado.nextLine();
            //creamos un array de caracteres                      
            char[] miChar = new char[codigo.length()];
            //pasamos el código recogido del teclado al array de caracteres
            miChar = codigo.toCharArray();
            //tomamos el primer caracter del array de caracteres y los convertimos a entero
            int n1 = Character.getNumericValue(miChar[0]);
    
            //efectuamos la primera evaluación de si el código tiene 9 caracteres
            if (codigo.length() == 9){ 
                //segunda evaluación, el primer carácter es un número ?           
                if ((n1 >= 0) && (n1 <= 9)){
                    //tercera evaluación, el segundo carácter es un guión ?
                    if (miChar[1] == '-'){
                        //creamos un bucle para evaluar los 7 caracteres restantes
                        for (int i = 2; i < 9; i++){
                            //en cada iteración del bucle, convertimos el carácter del array de caracteres en número
                            int n2 = Character.getNumericValue(miChar[i]);
                            //En la cuatra evaluación, comprobamos que ese carácter sea realmente un número
                            if ((n2 >= 0) && (n2 <= 9)){
                                //aumentamos el contador en 1
                                contador++;
                            }
                            else {
                                System.out.println("Las posiciones 3 - 9 tienen que ser números");
                            }
                        }
                    }
                    else {
                        System.out.println("El segundo carácter tiene que ser un guión");
                    }
                }
                else{
                    System.out.println("El primer carácter tiene que ser un número");
                }
            }else {
                System.out.println("El código debe constar de un número + un guión en la segunda posición + 7 números");
            }
            //si el contador es igual a 7 de cada uno de los 7 números evaluados
            if (contador == 7){
                //convertimos a String el array de caracteres
                String cod = String.valueOf(miChar);
                //agregamos el String al ArrayList del catálogo
                catalogo.add(cod);
                //imprimimos el ArrayList
                System.out.println(catalogo);
                //reseteamos el contador de los caracteres
                contador = 0;
            }
            //aumentamos en 1 el contador de los pedidos
            pedido++;
        }   
    } 
}

The intention would be to reduce so much evaluation, I don't know if there will be the possibility of doing a simple if restricting what is requested in a simple line like:

if (caracteres [0-9], '-', [0-9], [0-9], [0-9], [0-9], [0-9], [0-9], [0-9])

All the best

EDITED

Impressive, thank you all very much for the answers, finally, the code has been like this:

public class RestriccionesComprimidas {

    public static void main(String[] args){
        Scanner teclado = new Scanner(System.in);
        String codigo;
        int pedido = 1;
        ArrayList<String> catalogo = new ArrayList<String>();
    
        while (pedido <= 3){
            System.out.println("Introduzca el código: ");
            codigo = teclado.nextLine();                      
            Pattern pat = Pattern.compile("^[0-9]-[0-9]{7}$");
            Matcher mat = pat.matcher(codigo);                                                                           
            if ((mat.matches()) && (codigo.length() == 9)) {
                catalogo.add(codigo);
                System.out.println(catalogo);
            }else{
                System.out.println("El código debe constar de: \n"
                    + "- Primer carácter un número \n"
                    + "- Segundo carácter un guión \n"
                    + "- Siguientes 7 carácter serán números");
            }
            pedido++;
        }
        teclado.close();   
    } 
}

Thanks for your help

java
Martin Hope
el.trasgu
Asked: 2022-05-18 01:54:36 +0800 CST
  • 0

Fortunately, and thanks to the help of the community, I am solving the problems that I had in my application.

Now I'm transferring another one of them, that no matter how much I've read and followed manuals and videos, I can't solve it either.

I have a query that I make to the database, and from it I get the "Number", the "Name", and the digits that identify the image of each member that I have in the "dragables" app folder

The images are saved with the format "a" + "Nº" (This number is the one I get in the query)

This is the query class:

public class ListItemSocios
{
    ConexionSQLServer miConexion = new ConexionSQLServer();

    public List<Map<String,String>> getlist()
    {
        List<Map<String,String>> data = null;
        data = new ArrayList<Map<String,String>>();
        try
        {
            Statement stn = miConexion.metodoConexionBD().createStatement();
            ResultSet rst = stn.executeQuery("select f_ConsumerNO, f_ConsumerName, f_CardNO from t_b_Consumer");

            while (rst.next())
            {
                Map<String,String> dtname = new HashMap<String, String>();
                dtname.put("Numero", rst.getString("f_ConsumerNO"));
                dtname.put("Nombre", rst.getString("f_ConsumerName"));
                dtname.put("Foto", "a" + rst.getString("f_CardNO"));
                data.add(dtname);
            }
            rst.close();
            stn.close();
        }
        catch (Exception ee)
        {
            ee.printStackTrace();
        }
        return data;
    }
}

From here I call the above class and display the data in the list:

public void metodoLlenarListaSocios() {
    ListView list_S = (ListView) findViewById(R.id.lista_Socios);
    List<Map<String, String>> MyDataList = null;
    ListItemSocios MyData = new ListItemSocios();
    MyDataList = MyData.getlist();


    // definimos las imagenes que cargara el listview
    String[] nFotos = {"Foto"};
    int[] resId = new int[nFotos.length];
    for (int i = 0; i < nFotos.length; i++) {
        resId[i] = getResources().getIdentifier("a" + nFotos[i], "drawable", getPackageName());
    }
    String[] FromV = {"Numero", "Nombre", "Foto"};
    int[] Tow = {R.id.edt_socio_numero, R.id.edt_socio_nombre, R.id.img_socio_imagen};
    ad = new SimpleAdapter(PaginaListaS.this, MyDataList, R.layout.vista_socio, FromV, Tow);
    list_S.setAdapter(ad);
}

The data shows me well, but the image has no way and I don't know how to do it. I use a SimpleCursorAdapter, and in some answer I heard, that it would have to be with a CustomCursorAdapter, but I don't know how to do it.

This is the code for the custom view:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/black"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:layout_width="114dp"
            android:layout_height="134dp"
            android:orientation="vertical">

            <ImageView
                android:id="@+id/img_socio_imagen"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                tools:srcCompat="@tools:sample/avatars" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="130dp"
            android:orientation="vertical">

            <TextView
                android:id="@+id/txt_socio_numero"
                android:layout_width="match_parent"
                android:layout_height="30dp"
                android:text="Socio"
                android:textColor="@color/white"
                android:textStyle="bold" />

            <TextView
                android:id="@+id/edt_socio_numero"
                android:layout_width="match_parent"
                android:layout_height="35dp"
                android:textColor="@color/amarillo"
                android:textStyle="bold" />

            <TextView
                android:id="@+id/txt_socio_nombre"
                android:layout_width="match_parent"
                android:layout_height="30dp"
                android:text="Usuario"
                android:textColor="@color/white"
                android:textStyle="bold" />

            <TextView
                android:id="@+id/edt_socio_nombre"
                android:layout_width="match_parent"
                android:layout_height="38dp"
                android:textColor="@color/amarillo"
                android:textStyle="bold" />

        </LinearLayout>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="2dp"
        android:background="@color/white"
        android:orientation="horizontal"></LinearLayout>

</LinearLayout>

The result of the code is: enter image description here

You can call me useless, but I'm sorry to say, I don't get it. This thing about ArrayList, Map, adapter and Lists is beyond me.

I don't know how to apply the code you gave me. I have MyDataList which is supposed to be returned by MyData.getlist();. And then I have your code, but I don't know how to link one to the other.

public void metodoLlenarListaSocios() {
    ListView list_S = (ListView) findViewById(R.id.lista_Socios);
    List<Map<String, String>> MyDataList = null;
    ListItemSocios MyData = new ListItemSocios();
    MyDataList = MyData.getlist();

    for (int i = 0; i < MyDataList.size(); i++) {
        Map<String, String> socio = MyDataList.get(i);
        int resId = getResources().getIdentifier("a" + socio.get("Foto"), "drawable", getPackageName());
        socio.put("Foto", Integer.toString(resId));
    }
    String[] FromV = {"Numero", "Nombre", "Foto"};

    int[] Tow = {R.id.edt_socio_numero, R.id.edt_socio_nombre, R.id.img_socio_imagen};
    ad = new SimpleAdapter(PaginaListaS.this, MyDataList, R.layout.vista_socio, FromV, Tow);
    list_S.setAdapter(ad);
}
java
Martin Hope
el.trasgu
Asked: 2022-05-17 03:31:39 +0800 CST
  • 0

I have followed several manuals and seen several answers on the subject, but my limited knowledge allows me to find the solution, that's why I turn to you.

I want to upload a member's image to a activity. I have the images in the folder drawables.

If I load the image individually using R.dragable.3904123, the image loads without problems

If I use variables to get that same address of the image, the image is not displayed.

private void metodoCargarImagen() {
   //este método lo usaba para obtener la URL de la imagen del servidor, ahora obtengo(R.dragable.)
    String imagenURL = miConexion.metodoEnviarRutaImagenes();
    //este método lo utilizo para obtener el nombre de la imagen, en este caso(3904123)
    String nImagen = metodoObtenerNumeroImagen(socio);
    //aqui concateno (R.dragable. + a + 3904123)
    String rutaImg = imagenURL + "a" + nImagen;
    //convierto el String en URI ?
    Uri uriImagen = Uri.parse(rutaImg);
    //Agrega imagen al ImageView.
    Picasso.with(this)
            .load(uriImagen) //con este método, a la derecha me aparece el texto "RequestCreator"
            .error(R.drawable.avestruz)
            .fit()
            .centerInside()
            .into(img_vS_img);
}

This is the image code:

<ImageView
    android:id="@+id/img_vS_img"
    android:layout_width="102dp"
    android:layout_height="145dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:srcCompat="@drawable/avestruz" />

This would be the code loading the same image address, but individually:

private void metodoCargarImagen() {
    String imagenURL = miConexion.metodoEnviarRutaImagenes();
    String nImagen = metodoObtenerNumeroImagen(socio);
    //Uri rutaImg = imagenURL + "a" + nImagen + extImg;
    String rutaImg = imagenURL + "a" + nImagen;
    //Uri uriImage = Uri.parse("android.resource://" + getPackageName() +"/"+ rutaImg);
    //Crea ruta de la imagen.
    //rutaImg = rutaImg.replace("@drawable/", "android.resource://"+ getPackageName() +"/drawable/");
    //Obtiene la uri de la imagen.
    Uri uriImagen = Uri.parse(rutaImg);
    //Agrega imagen al ImageView.
    Picasso.with(this)
            .load(R.drawable.a3904123)  //Me sigue apareciendo "RequestCreator" pero la imagen es visible
            .error(R.drawable.avestruz)
            .fit()
            .centerInside()
            .into(img_vS_img);
}

image of the code by variable

enter image description here

enter image description here

The possibility of loading the image without converting it into Uri, I had previously discarded it because it didn't work for me either

java
Martin Hope
el.trasgu
Asked: 2022-05-05 11:47:09 +0800 CST
  • 1

Since the beginning of my project I have been trying to show the images of the partners stored in a folder of the server of my database, and I have not succeeded until now

I have videos, manuals, searches and infinite websites, in all of them I see similar things, but in the vast majority those images are taken from the same website.

What I want is to take them from a shared PHOTO folder

I arrive at the server through a dynamic IP that we are going to assume is "mi_ip_dinamica.net" I use URL = "\mi_ip_dinamica.net\Equipo-BaseDatos\PHOTO" If I go to the network I see my computer and my shared folder, in location it says: \Team-Database, resource \PHOTO

I have tried several ways, this one with the picasso library

String extImg = ".jpg";

private String imageURL = "\my_ip_dynamic.net\Equipment-Database\PHOTO";

String nImage = methodGetImageNumber();

    String rutaImg = imageURL + nImagen + extImg;

    Picasso.with(this)

            .load(rutaImg)

            .error(R.drawable.avestruz)

            .fit()

            .centerInside()

            .into(Cimagen);

In the GetImageNumber method, what I do is ask the database for the user number, the image of each user is stored named by that number.jpg

Could someone give me an idea? What am I doing wrong, what do I need to do, how could I redirect my project? Any help, please?

Thanks for the answer Jorgesys.

With dynamic ip, I mean the changeip.com server, that is, my public ip, which is dynamic, is linked to the changeip service, so it works as if it were a fixed static ip.

When you mention, in the imageURL string, this is where I'm missing something, I don't know if it's:

"https://mi_ip_dinamica.net/Equipo-BaseDatos/PHOTO";

either:

"https://mi_ip_dinamica.net/PHOTO";

Well, I have the folder shared and in the same folder it tells me that its network address is:

//equipoLocal/photo.

I also wouldn't know if I have to open specific ports on the router for picasso. I currently open port 136 for http:// or 445 for https://.

But I can't get it to work either way.

Another problem I see is that when I put the URI in the browser, it goes blank without loading any image

java