Cross Platform Web: HelloWorld and CH8Ex1CircleWeb

CrossPlatform Hello World

Ch8Ex1CircleWeb

Swift: demo

Here is the workaround using repl.it
Circle on Repl.it
This is for use on iOS using XCode

---

// Declare our new Circle class
class Circle {
    var radius = 0.0
    
    init(radius: Double) { // Constructor
        self.radius = radius
        
    }
    var Area: Double{
        return 3.14*(radius*radius)
    }
    
    func getArea() -> Double {
        return 3.14*(radius*radius)
    }
    
    var Circumference: Double {
        return 2*3.14*radius
    }
    func getCircumference() -> Double{
        return 2*3.14*radius
    }
}



@IBAction func btnCalc(_ sender: UIButton) {

        let rad=Double(tbRad.text!);

        let circ1=Circle(radius:rad!);

        let a=String(format: "%.2f",circ1.getArea());

        let c=circ1.getCircumference();

        lblArea.text="Area: \(a)";

        lblCirc.text="Circumfrence: \(c)";

    }

Xamarin Intro: Hello World

 1) Open MS Visual Studio 2019

2) File-> New Project->C#->Android->Android App (Xamarin) Blank App (
3) Launch the app
You can run the app on your android phone via usb cable
or
Open Android Studio and launch the emulator.
Now you will see that emulator on the Start arrow:

4) Now modify the ui that was created, first stop the app (red square button)
Goto Resources->Layout->Main.axml
- Add a linear (vertical) layout to replay the Relative Layout (see the xml below)
- Add a TextView
- Add a EditView
- Add a button
5) Goto Mainactivity.cs
add code like this after line 17:
            Button button = FindViewById<Button>(Resource.Id.button1);

            TextView tvResult = FindViewById<TextView>(Resource.Id.textView1);

            EditText etName = FindViewById<EditText>(Resource.Id.editText1);

            button.Click += delegate {

                tvResult.Text = "Hello " + etName.Text;

            };

My activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

    <Button

        android:id="@+id/button1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="Click Me" />

    <EditText

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:minWidth="25px"

        android:minHeight="25px"

        android:id="@+id/editText1"

        android:hint="Your Name" />

    <TextView

        android:textAppearance="?android:attr/textAppearanceMedium"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:id="@+id/textView1" />

</LinearLayout>

MS Visual Studio 2019 Xamarin: How To on Android

Note: The emulator requires that you have an Intel CPU on your workstation.

1) Open MS Visual Studio 2019
2) File-> New Project->C#->Android->Android App (Xamarin) Blank App 

3) In MainActivity.cs

- on line 6 insert

using System;

using Android.Widget; //if not already there

4) Launch the app
You can run the app on your android phone via usb cable
or
Open Android Studio and launch the emulator.
Now you will see that emulator on the Start arrow:

5) Now modify the ui that was created, first stop the app (red square button)
Goto Resources->Layout->Main.axml

- Delete the relative layout.
- Add a linear (vertical) layout (see the xml below)
- Add a TextView
- Add a EditView
- Add a button

  6) Add the Circle class Right Click on the project->New C# Class named Circle.
public class Circle
    {
        private double radius;

        public double Radius
        {
            get
            {
                return radius;
            }
            set
            {
                radius = value;
                if (radius < 0)
                    radius = radius * -1;
            }
        }

        public Circle(double radius)
        {
            this.radius = radius;
        }

        public double getArea()
        {
            return Math.PI * radius * radius;
        }

        public double getCircumference()
        {
            return 2 * Math.PI * radius;
        }
    }

7) Goto Mainactivity.cs

after line 17// SetContentView(Resource.Layout.activity_main);
add code like this: 
Button button = FindViewById<Button>(Resource.Id.button1);
TextView tvResult = FindViewById<TextView>(Resource.Id.textView1);
EditText etRadius = FindViewById<EditText>(Resource.Id.editText1);

button.Click += delegate {
  Circle myCircle = new Circle(Double.Parse(etRadius.Text));

  tvResult.Text = "Area: " + String.Format("{0:0.00}", myCircle.getArea());

  tvResult.Text +="\nCircumference: "+String.Format("{0:0.00}", myCircle.getCircumference());

};

8) You will see this error: The name 'Double' does not exist in the current context
Click on the light bulb and it will add:
using System;

9) If you can not run an emulator and have an android phone:
Get the .apk from here \bin\Debug
Copy it to your phone and install it.

Note see below for a LinearLayout example.
//activity_main.xml
<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

    <Button

        android:id="@+id/button1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="Calc" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:minWidth="25px"
        android:minHeight="25px"
        android:id="@+id/editText1"
        android:hint="Radius" />

    <TextView

        android:textAppearance="?android:attr/textAppearanceMedium"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:id="@+id/textView1" />

</LinearLayout>

Week12 Repl.it CircleApp Xamarin workaround using Repl.it

This is a work around if you do not have access to MS Visual Studio 2017 or newer.
CircleApp on Repl.it

Visual Studio 2019 Enterprise Tips

AndroidStudio Projects: Circle how to

package ... //this is the first line in your MainActivity.java 

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initButton();
    }
    private void initButton()
    {
        Button button = (Button)findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                EditText rad = (EditText) findViewById(R.id.editTextRadius);
                double r = Double.parseDouble(rad.getText().toString());
                if (r <= 0)
                    r = r * -1;

                Circle circ= new Circle(r);

                TextView textViewA = (TextView) findViewById(R.id.textViewArea);
                TextView textViewC = (TextView) findViewById(R.id.textViewCircumference);
                textViewA.setText(String.format("Area: %.2f", circ.getArea()));
                textViewC.setText(String.format("Circumference: %.2f", circ.getCircumference()));

            }
        });
    }
}

--snip
package ... //this is the first line in your Circle.java file

public class Circle {
    double radius;

    public double getRadius() {
        return radius;
    }

    public void setRadius(double radius) {
        this.radius = radius;
    }

    public Circle(double radius){
        this.radius = radius;
    }

    public double getArea(){
        return Math.PI * radius * radius;
    }

    public double getCircumference(){
        return 2 * Math.PI * radius;
    }

}

Unit 8 Chapter9 iOS: Hello World Swift on Repl.it

Hello World Swift on Repl.it

Augusta Technical College Student Services Spring Semester Survey

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Week 16 Platform Revisit Recording

CIST2381 Week 16 Platform Revisit Recording Password=AieA6W7D

Week 16 Platform Revisit

T1 Implement a Triangle Calculator on the platform of your choice.
Calculates the area of a  Equilateral Triangle.
T2 Implement a Triangular Pyramid calculator.
The volume of a  triangular Pyramid
Note: The triangle sides are all the same.
T1 The Area of Equilateral Triangle: K = (1/4) * √3 * len2  
T2 The volume of a triangular Pyramid: 1/3*(√3)/4*(Length*Length)*Height
Square root examples:AppInventor
c: result=sqrt(3);
c#: Math.Sqrt(3);
Java: Math.sqrt(3);
Swift:
let x = 3.0
print(x.squareRoot())

AppInventor

  online Triangular Pyramid Calculator

Equilateral Triangles Calculator

Triangle Calculator

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Week 12 Xamarin Demo Recording YnCPEpP5

Week 12 Xamarin Demo Recording

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If you are using a desktop please get and use a mic. Contact me for assistance.

Swift using Repl.it

Here is a circle app example using swift on Repl.it.

Ch7 Xamarin Circle class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;

namespace Ch7Ex1Circle
{
    public class Circle
    {
        private double radius;

        public double Radius
        {
            get
            {
                return radius;
            }
            set
            {
                radius = value;
                if (radius < 0)
                    radius = radius * -1;
            }
        }

        public Circle(double radius)
        {
            this.Radius = radius;
        }

        public double getArea()
        {
            return Math.PI * radius * radius;
        }

        public double getCircumference()
        {
            return 2 * Math.PI * radius;
        }
    }

}