In Sketchware: How to create a calculator for any simple formula?

Create a simple formula calculator Android app in Sketchware

Here is a tutorial to calculate using any simple formula, for users of Sketchware Android app.
I'll take the example of calculating volume of a cone.Formula is: Vcone = 1/3 × pi × r2 × h

Step 1
Download Sketchware

Step 2
Go to my projects and start a new project.
Fill details in Project Settings:-
Package name: com.cone
Project name: conevolume
App name: Cone Volume
App icon:
App version: 1.0

Step 3
Create View of your app. It is saved as main.xml. The process is simple. In the view field drag and drop 'linear', 'textview', 'button' and 'edittext' to places where you want them to appear.
In my project I have inserted 5 'linear', 4 'textview', 3 'edittext' and 2 'button'.

Edit the 'textview' fields to write details. Modify text of 'button' to write calculate, Reset, etc. Change background color of 'linear'. Modify Edittext to remove 'hint', and change 'input type' to 'number decimal'. I have modified Edittext1 and Edittext2 to take input of radius and height of cone, and Edittext3 is for volume output.


Step 4
After your view is set, click on 'Logic'.
You will find a screen as in picture below.
Click on onCreate and drag and drop 'set Enable' view into the field. Now choose 'Edittext3' and make setEnable 'false'


Step 5
Now go to 'Button 1 onClick'. Add three new 'variables'. I have added 'r', 'h' and 'vol'. Drag if - else control into field. Now add: if not length of Edittext1 and Edittext2 is > 0, show message ..., else... The picture below shows how to do it.

Now within 'else' field, set Variable 'r' to, toNumber Edittext1, and so on for all input fields. Set output variable 'vol' to your formula pi * r^2 * h / 3. Then set Edittext3 to your output variable 'vol'. It is shown in the picture below.
Step 6
Go to 'Button2 onClick', which is reset button and use 'settext' view for all three 'Edittext' to set them to empty.
Step 7
Now Compile and run the App. Your app is ready.

You can send the apk to your Email account to get the apk file. Or you can save it to your mobile directly using 'ES File explorer' app.

This video below is a tutorial on how to make an app for simple calculations:


Here is a video of a temperature converter created in Sketchware:


For any queries please write below.

Comments

  1. Hi can you help me pls? Trying to make a app where you get user input, multiply by a number then devide by 2 and display the answer?

    ReplyDelete
  2. I am developing own native language Dictionary app..with help of your video youtube..
    I want a picture for every word different pictures ..eg apple image of apple.
    Mango img of mango...can you help me.?

    ReplyDelete
    Replies
    1. I'll make a tutorial for it. And then I will send you link

      Delete
  3. how can make app disable button befor user input number
    or i have 5 input (edittext) if user fill 2 input app fill other 0 auto

    ReplyDelete
    Replies
    1. @ahmed Darwesh
      To disable Button, Use set enable false Block in onCreate. And on Edittext on text changed event (for all Edittext), if length of edittext1.getText is more than 0 and Edittext2.getText is more than 0, use set enable true for button.

      Delete
  4. جيد جدا انا ممتن لك واتابعك كثير شكرا لك

    ReplyDelete
  5. I want to make a financial calculator for making check stubs. How can I make one for Texas taxes

    ReplyDelete
  6. Dear sir

    When I input number in mainActivity
    then how can i show input equally to anotherActivity

    ReplyDelete
    Replies
    1. You have to create file shared preferences component with same name in both activities. Then you can save the input in file Shared preferences using a key, and retrieve it on another Activity.

      Delete
  7. Is very gooooooood i like the sketchware and you sanjeev

    ReplyDelete
  8. This was a really great contest and hopefully I can attend the next one. It was alot of fun and I really enjoyed myself..
    How to make an app

    ReplyDelete
  9. Hello,

    I have a weird problem that I come across when subtracting certain numbers for my calculator app. When I try to subtract .10 from .01, the results are -.0900002. It doesnt do this with all number numbers accept when I'm adding numbers certain together. Can you please tell me how to fix it.

    ReplyDelete
  10. hi ... i need a help in calculation method.

    137 / 20 = 6.85
    i need to split the result value 6.85 in two textboxs i.e. 6 in textview4 and 85 in textview5. (split the value after decimal)
    is it possible in sketchware ?
    Thanks in advance.

    ReplyDelete
  11. Suppose n is your result in decimal format.
    You can get the integer value by using:
    floor (n).
    Floor is a math block.

    You can get the remaining decimal value by subtracting floor(n) from n.

    ReplyDelete
    Replies
    1. Thanks for your reply.
      I followed the floor in match block, but could not found how to substract floor... please guide further.

      Thanks :)

      Delete
  12. how can i set brackets? I.e. (d*i)/10000

    ReplyDelete
    Replies
    1. No need of brackets in sketchware, it automatically adds brackets in code.

      Delete
  13. cluld help me on an app im trying to make for my work. im calculating boardfoot.the formula we use at work is
    W*L÷12+15% =bdft

    i need W and L as an input sa result is the bdft

    i cant seem to get the 15% not 0.15.coz its the 15% of the total of W*L÷12

    ReplyDelete
  14. Small code . I can't see. You can explain me?

    ReplyDelete
  15. Hello i want do 100:250 but it result was 0. what is the problem

    ReplyDelete
    Replies
    1. Since the result is less than 1, use the block toString with decimal.

      Delete
  16. Hello, I wanna make an app to manage my coaching class in which the name of sudent, I batch, and fees history exist

    ReplyDelete
  17. Amigo...tipo..estou tentando faser um app com a seguinte logica : na primeira tela coloco um numero em um edit text, esse numero tem que ser multiplcado pelo resultado de outra multiplicação de duas edit text que esta na segunda tela, e o resultado final deve aparecer em uma textview na terceira tela.. pode me ajudar?

    ReplyDelete

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