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1. Práctica 4: “Calculadora_1”
Aplicación: Estaesuna app que contengalasfuncionesbásicasde unacalculadora.
Código 1:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.lap_c_pc36.myapplication.MainActivity">
<TextView
android:id="@+id/textView2"
android:layout_width="117dp"
android:layout_height="30dp"
android:text="Numero 1"
android:textSize="20dp" />
<EditText
android:id="@+id/num1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Introduce un numero"
android:inputType="numberDecimal" />
<TextView
android:id="@+id/textView3"
android:layout_width="82dp"
android:layout_height="30dp"

2. android:text="Numero 2"
android:textSize="20dp"/>
<EditText
android:id="@+id/num2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Introduce un numero"
android:inputType="numberDecimal" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="@+id/btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="operacionsuma"
android:text="Suma" />
<Button
android:id="@+id/btn3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="operacionresta"
android:text="Resta" />
<Button
android:id="@+id/btn2"
android:layout_width="match_parent"
android:layout_height="wrap_content"

3. android:onClick="operacionmulti"
android:text="Multiplicacion" />
<Button
android:id="@+id/btn1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="operaciondivision"
android:text="Division" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/textView5"
android:layout_width="191dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="RESULTADO"
android:textSize="20dp" />
<EditText
android:id="@+id/num3"
android:layout_width="293dp"
android:layout_height="4dp"
android:layout_weight="2"
android:ems="10"
android:hint="Resultado"
android:inputType="numberDecimal" />
</LinearLayout>
</LinearLayout></LinearLayout>

4. Código 2:
package com.example.lap_c_pc36.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
public class MainActivityextends AppCompatActivity{
public EditText numero1, numero2, resul;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
numero1=(EditText)findViewById(R.id.num1);
numero2=(EditText)findViewById(R.id.num2);
resul=(EditText)findViewById(R.id.num3);
}
public void operacionsuma(Viewview){
float suma;
float n1= Float.parseFloat(numero1.getText().toString());
float n2=Float.parseFloat(numero2.getText().toString());
suma= n1+n2;
resul.setText(String.valueOf(suma));
}
public void operacionresta(Viewview){
float resta;
float n1=Float.parseFloat(numero1.getText().toString());
float n2=Float.parseFloat(numero2.getText().toString());
resta= n1-n2;

5. resul.setText(String.valueOf(resta));
}
public void operacionmulti(Viewview){
float mul;
float n1=Float.parseFloat(numero1.getText().toString());
float n2=Float.parseFloat(numero2.getText().toString());
mul=n1*n2;
resul.setText(String.valueOf(mul));
}
public void operaciondivision(Viewview)
{
float div;
float n1=Float.parseFloat(numero1.getText().toString());
float n2=Float.parseFloat(numero2.getText().toString());
div= n1/n2;
resul.setText(String.valueOf(div));
}
Captura:
Conclusión:En estapráctica se aprende a utilizarvariablesenAndroidStudioya utilizardiferentes
objetosyextraerel valorde un objeto.