Let's started with our calculator android App

Hello, friends and this is my first video and I am trying my best in this video. I have to make a CALCULATOR APP in the android studio. you can learn coding in an easy way and you can make your own application through the android studio.

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Step-1

Open your Android Studio
Click on Start a New Android Studio Project.
Give your Application Name wctutorialcalculator and leave other fields blank as it is, then clicks NEXT.

Step-2

Select the Minimum SDK API 15: Android 4.0.3(IceCreamSandwich). I selected because it covers almost 94% device and it has almost all the features. If you want to cover 100% device then you can select API 8: Android 2.2(Froyo).

Step-3

Select the Empty Activity and click NEXT.
Leave the activity name MainActivity as it is and leave everything as it is. Click Finish.

Products Use For Making Videos:

Mic: https://amzn.to/3k9EE0E

Tripod: https://amzn.to/33nZ5Qx

Camera: https://amzn.to/35C3KB4

Laptop: https://amzn.to/3bZcMJS

LED Tubelight: https://amzn.to/2ZwAF6C

Web Hosting: (1) https://www.siteground.com/index.htm?afcode=c434ad624e8607aa53ca1d322ef7ecdb

(2) https://www.hostg.xyz/aff_c?offer_id=6&aff_id=49097

(3) https://bluehost.sjv.io/joqOZ

Step-4

After clicking Finish, it takes around ~2-3 minutes to build Activity and files.
Here is a final project structure for your application.

Step-5

Now we have to add our Java code in our MainActivity.java file.
So open you MainActivity.java file from left side of IDE (app -> java -> com.wctutorial.wctutorialcalculator -> MainActivity.java)

package com.wctutorial.tutorials.wctutorialcalculator;
 
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
 
public class MainActivity extends AppCompatActivity {
 
    Button button0, button1, button2, button3, button4, button5, button6,
            button7, button8, button9, buttonAdd, buttonSub, buttonDivision,
            buttonMul, button10, buttonC, buttonEqual;
    EditText wctutorialEditText;
 
    float mValueOne, mValueTwo;
 
    boolean wctutorialAddition, mSubtract, wctutorialMultiplication, wctutorialDivision;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        button0 = (Button) findViewById(R.id.button0);
        button1 = (Button) findViewById(R.id.button1);
        button2 = (Button) findViewById(R.id.button2);
        button3 = (Button) findViewById(R.id.button3);
        button4 = (Button) findViewById(R.id.button4);
        button5 = (Button) findViewById(R.id.button5);
        button6 = (Button) findViewById(R.id.button6);
        button7 = (Button) findViewById(R.id.button7);
        button8 = (Button) findViewById(R.id.button8);
        button9 = (Button) findViewById(R.id.button9);
        button10 = (Button) findViewById(R.id.button10);
        buttonAdd = (Button) findViewById(R.id.buttonadd);
        buttonSub = (Button) findViewById(R.id.buttonsub);
        buttonMul = (Button) findViewById(R.id.buttonmul);
        buttonDivision = (Button) findViewById(R.id.buttondiv);
        buttonC = (Button) findViewById(R.id.buttonC);
        buttonEqual = (Button) findViewById(R.id.buttoneql);
        wctutorialEditText = (EditText) findViewById(R.id.edt1);
 
 
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                wctutorialEditText.setText(wctutorialEditText.getText() + "1");
            }
        });
 
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                wctutorialEditText.setText(wctutorialEditText.getText() + "2");
            }
        });
 
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                wctutorialEditText.setText(wctutorialEditText.getText() + "3");
            }
        });
 
        button4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                wctutorialEditText.setText(wctutorialEditText.getText() + "4");
            }
        });
 
        button5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                wctutorialEditText.setText(wctutorialEditText.getText() + "5");
            }
        });
 
        button6.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                wctutorialEditText.setText(wctutorialEditText.getText() + "6");
            }
        });
 
        button7.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                wctutorialEditText.setText(wctutorialEditText.getText() + "7");
            }
        });
 
        button8.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                wctutorialEditText.setText(wctutorialEditText.getText() + "8");
            }
        });
 
        button9.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                wctutorialEditText.setText(wctutorialEditText.getText() + "9");
            }
        });
 
        button0.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                wctutorialEditText.setText(wctutorialEditText.getText() + "0");
            }
        });
 
        buttonAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
 
                if (wctutorialEditText == null) {
                    wctutorialEditText.setText("");
                } else {
                    mValueOne = Float.parseFloat(wctutorialEditText.getText() + "");
                    wctutorialAddition = true;
                    wctutorialEditText.setText(null);
                }
            }
        });
 
        buttonSub.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mValueOne = Float.parseFloat(wctutorialEditText.getText() + "");
                mSubtract = true;
                wctutorialEditText.setText(null);
            }
        });
 
        buttonMul.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mValueOne = Float.parseFloat(wctutorialEditText.getText() + "");
                wctutorialMultiplication = true;
                wctutorialEditText.setText(null);
            }
        });
 
        buttonDivision.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mValueOne = Float.parseFloat(wctutorialEditText.getText() + "");
                wctutorialDivision = true;
                wctutorialEditText.setText(null);
            }
        });
 
        buttonEqual.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mValueTwo = Float.parseFloat(wctutorialEditText.getText() + "");
 
                if (wctutorialAddition == true) {
                    wctutorialEditText.setText(mValueOne + mValueTwo + "");
                    wctutorialAddition = false;
                }
 
                if (mSubtract == true) {
                    wctutorialEditText.setText(mValueOne - mValueTwo + "");
                    mSubtract = false;
                }
 
                if (wctutorialMultiplication == true) {
                    wctutorialEditText.setText(mValueOne * mValueTwo + "");
                    wctutorialMultiplication = false;
                }
 
                if (wctutorialDivision == true) {
                    wctutorialEditText.setText(mValueOne / mValueTwo + "");
                    wctutorialDivision = false;
                }
            }
        });
 
        buttonC.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                wctutorialEditText.setText("");
            }
        });
 
        button10.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                wctutorialEditText.setText(wctutorialEditText.getText() + ".");
            }
        });
    }
}

In-Line 156 – 183: Here we set click listener on “=” button. We put condition like if the user click the Add button the wctutorialAddition value is set True on the click listener of the Add button.

After we set the crunchifyAddition value to false, so that we can perform Add an action again.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/relative1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
 
    <EditText
        android:id="@+id/edt1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
 
 
    <Button
        android:id="@+id/button1"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignEnd="@+id/button4"
        android:layout_alignRight="@+id/button4"
        android:layout_below="@+id/edt1"
        android:layout_marginTop="94dp"
        android:text="1" />
 
    <Button
        android:id="@+id/button2"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/button1"
        android:layout_toLeftOf="@+id/button3"
        android:layout_toStartOf="@+id/button3"
        android:text="2" />
 
    <Button
        android:id="@+id/button3"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/button2"
        android:layout_centerHorizontal="true"
        android:text="3" />
 
    <Button
        android:id="@+id/button4"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button1"
        android:layout_toLeftOf="@+id/button2"
        android:text="4" />
 
    <Button
        android:id="@+id/button5"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/button4"
        android:layout_alignLeft="@+id/button2"
        android:layout_alignStart="@+id/button2"
        android:text="5" />
 
    <Button
        android:id="@+id/button6"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button3"
        android:layout_alignStart="@+id/button3"
        android:layout_below="@+id/button3"
        android:text="6" />
 
    <Button
        android:id="@+id/button7"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button4"
        android:layout_toLeftOf="@+id/button2"
        android:text="7" />
 
    <Button
        android:id="@+id/button8"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button5"
        android:layout_alignStart="@+id/button5"
        android:layout_below="@+id/button5"
        android:text="8" />
 
    <Button
        android:id="@+id/button9"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button6"
        android:layout_alignStart="@+id/button6"
        android:layout_below="@+id/button6"
        android:text="9" />
 
    <Button
        android:id="@+id/buttonadd"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignEnd="@+id/edt1"
        android:layout_alignRight="@+id/edt1"
        android:layout_alignTop="@+id/button3"
        android:layout_marginLeft="46dp"
        android:layout_marginStart="46dp"
        android:layout_toRightOf="@+id/button3"
        android:text="+" />
 
    <Button
        android:id="@+id/buttonsub"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignEnd="@+id/buttonadd"
        android:layout_alignLeft="@+id/buttonadd"
        android:layout_alignRight="@+id/buttonadd"
        android:layout_alignStart="@+id/buttonadd"
        android:layout_below="@+id/buttonadd"
        android:text="-" />
 
    <Button
        android:id="@+id/buttonmul"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/buttonsub"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_alignStart="@+id/buttonsub"
        android:layout_below="@+id/buttonsub"
        android:text="*" />
 
    <Button
        android:id="@+id/button10"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button7"
        android:layout_toLeftOf="@+id/button2"
        android:text="." />
 
    <Button
        android:id="@+id/button0"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button8"
        android:layout_alignStart="@+id/button8"
        android:layout_below="@+id/button8"
        android:text="0" />
 
    <Button
        android:id="@+id/buttonC"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button9"
        android:layout_alignStart="@+id/button9"
        android:layout_below="@+id/button9"
        android:text="C" />
 
    <Button
        android:id="@+id/buttondiv"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignEnd="@+id/buttonmul"
        android:layout_alignLeft="@+id/buttonmul"
        android:layout_alignRight="@+id/buttonmul"
        android:layout_alignStart="@+id/buttonmul"
        android:layout_below="@+id/buttonmul"
        android:text="/" />
 
    <Button
        android:id="@+id/buttoneql"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignEnd="@+id/buttondiv"
        android:layout_alignLeft="@+id/button10"
        android:layout_alignRight="@+id/buttondiv"
        android:layout_alignStart="@+id/button10"
        android:layout_below="@+id/button0"
        android:layout_marginTop="37dp"
        android:text="=" />
 
</RelativeLayout>

Now Ready to run the calculator app.

wctutorial.com

how to create Calculator in android studio

Let's started with our calculator android App

Step-1

Step-2

Step-3

Step-4

Step-5

SURAJ KUMAR

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how to create Calculator in android studio

Let's started with our calculator android App

Step-1

Step-2

Step-3

Step-4

Step-5

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