Hola Mundo Android SDK Eclipse ADT – Credit – Money

Éste es un video en el que se muestra como hacer nuestro primer programa en android, utilizando elAndroid SDKla aplicación es el clásico "Hola Mundo!", utilizando los controles Button y TextView.

Enlace directo:https://www.youtube.com/watch?v=vqrpEo-3llY

Adicional:

activity_main.xml

AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/AbsoluteLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" 

    TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_x="27dp"
        android:layout_y="29dp"
        android:text="Bienvenido" /

    Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_x="42dp"
        android:layout_y="94dp"
        android:onClick="HolaMundo"
        android:text="Aceptar" /

/AbsoluteLayout

MainActivity.java

package com.example.holamundo;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends Activity {
 private TextView tv1;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  tv1 = (TextView)findViewById(R.id.textView1);
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }
 
 public void HolaMundo(View v){
  tv1.setText("HolaMundo!");
 }

}

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Agregar y eliminar clases en jQuery. – Miami – Abogado – Law Firm

Para agregar y eliminar clases enjQuery haremos uso de las funciones.addClass() y.removeClass(), su sintaxis sería de la siguiente manera:

$('elementohtml').addClass('NombreDeClase');
$('elementohtml').removeClass('NombreDeClase');

$('') convierte nuestro elemento html en un objetojQuery y las funciones.addClass() y.removeClass() agregan a éste elemento html la clase la cual coloquemos como parámetro o argumento.

Un ejemplo de como agregar una clase por ejemplo a un párrafo para cambiar su color de fuente sería:

$(document).ready(function(){
         $('p').addClass('azul');    
});

Ésto suponiendo que tenemos en nuestrocss una clase llamada.azul:

.azul { 
color: #0938F0; 
} 

Y si queremos cambiar la clase del párrafo al hacer clic en un botón haríamos lo siguiente:

-Para agregar el botón usaremos la etiqueta de htmlbutton , su sintaxis sería:

button type="button"Texto del boton/button

-Y nuestro botón sería:

button type="button"Agregar Clase/button

Nuestro código jQuery para cambiar la clase del párrafo haciendo clic en el botón "Agregar Clase" sería:

$(document).ready(function(){
    $('button').click(function(){
         $('p').addClass('azul');    
    });
});

Y para quitar una clase haciendo clic en un botón:

$(document).ready(function(){
    $('button').click(function(){
         $('p').removeClass('azul');    
    });
});

En el siguiente ejemplo agregamos una clase a un texto en undiv y lo transformamos en un cuadrado, y a un rectángulo le quitamos su clase y lo convertimos en un simple texto:

!DOCTYPE html
html
    head
 style
 h2 {
    font-family:arial;
}
 .rectangulo{
 display: inline-block;
 height:150px;
 width:400px;
 background-color:#BB17ED;
 font-family:arial;
 color:#ffffff;
 border-radius: 8px;
 text-align:center;
 margin-top:5px;
}
 .azul{
 display: inline-block;
 height:200px;
 width:200px;
 background-color:#0938F0;
 font-family:arial;
 color:#ffffff;
 border-radius: 8px;
 text-align:center;
 margin-top:5px;
}
 /style
     titleAgregar y eliminar clases jQuery/title
 script src="http://code.jquery.com/jquery-1.9.1.js"/script
 /head
 body
  h2Haz clic en los botones para eliminar y agregar las clases/h2
  button id="uno" type="button"Agregar Clase/button
  button id="dos" type="button"Quitar Clase/button
  /br
  div id="cuadrado"Soy un cuadro/div
  div Class="rectangulo"Soy un rectangulo/div    
 script
$(document).ready(function(){
    $('#uno').click(function(){
         $('#cuadrado').addClass('azul');    
    });
     $('#dos').click(function(){
         $('.rectangulo').removeClass('rectangulo');
    });
});
 /script
 /body
/html

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