Easy and Excellent Source Code of Calculator App

Easy and Excellent Source Code of Calculator App is written below,

Calculator.java:

package com.example.calculator;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {
    double in1 = 0, i2 = 0;
    TextView edittext1;
    boolean Add, Sub, Multiply, Divide, Remainder, deci;
    Button button_0, button_1, button_2, button_3, button_4, button_5, button_6, button_7, button_8, button_9, button_Add, button_Sub,
            button_Mul, button_Div, button_Equ, button_Del, button_Dot, button_Remainder;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button_0 = (Button) findViewById(R.id.b0);
        button_1 = (Button) findViewById(R.id.b1);
        button_2 = (Button) findViewById(R.id.b2);
        button_3 = (Button) findViewById(R.id.b3);
        button_4 = (Button) findViewById(R.id.b4);
        button_5 = (Button) findViewById(R.id.b5);
        button_6 = (Button) findViewById(R.id.b6);
        button_7 = (Button) findViewById(R.id.b7);
        button_8 = (Button) findViewById(R.id.b8);
        button_9 = (Button) findViewById(R.id.b9);
        button_Dot = (Button) findViewById(R.id.bDot);
        button_Add = (Button) findViewById(R.id.badd);
        button_Sub = (Button) findViewById(R.id.bsub);
        button_Mul = (Button) findViewById(R.id.bmul);
        button_Div = (Button) findViewById(R.id.biv);
        button_Remainder = (Button) findViewById(R.id.BRemain);
        button_Del = (Button) findViewById(R.id.buttonDel);
        button_Equ = (Button) findViewById(R.id.buttoneql);

        edittext1 = (TextView) findViewById(R.id.display);

        button_1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                edittext1.setText(edittext1.getText() + “1”);
            }
        });

        button_2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                edittext1.setText(edittext1.getText() + “2”);
            }
        });

        button_3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                edittext1.setText(edittext1.getText() + “3”);
            }
        });

        button_4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                edittext1.setText(edittext1.getText() + “4”);
            }
        });

        button_5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                edittext1.setText(edittext1.getText() + “5”);
            }
        });

        button_6.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                edittext1.setText(edittext1.getText() + “6”);
            }
        });

        button_7.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                edittext1.setText(edittext1.getText() + “7”);
            }
        });

        button_8.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                edittext1.setText(edittext1.getText() + “8”);
            }
        });

        button_9.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                edittext1.setText(edittext1.getText() + “9”);
            }
        });

        button_0.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                edittext1.setText(edittext1.getText() + “0”);
            }
        });

        button_Add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (edittext1.getText().length() != 0) {
                    in1 = Float.parseFloat(edittext1.getText() + “”);
                    Add = true;
                    deci = false;
                    edittext1.setText(null);
                }
            }
        });

        button_Sub.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (edittext1.getText().length() != 0) {
                    in1 = Float.parseFloat(edittext1.getText() + “”);
                    Sub = true;
                    deci = false;
                    edittext1.setText(null);
                }
            }
        });

        button_Mul.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (edittext1.getText().length() != 0) {
                    in1 = Float.parseFloat(edittext1.getText() + “”);
                    Multiply = true;
                    deci = false;
                    edittext1.setText(null);
                }
            }
        });

        button_Div.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (edittext1.getText().length() != 0) {
                    in1 = Float.parseFloat(edittext1.getText() + “”);
                    Divide = true;
                    deci = false;
                    edittext1.setText(null);
                }
            }
        });

        button_Remainder.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (edittext1.getText().length() != 0) {
                    in1 = Float.parseFloat(edittext1.getText() + “”);
                    Remainder = true;
                    deci = false;
                    edittext1.setText(null);
                }
            }
        });

        button_Equ.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (Add || Sub || Multiply || Divide || Remainder) {
                    i2 = Float.parseFloat(edittext1.getText() + “”);
                }

                if (Add) {

                    edittext1.setText(in1 + i2 + “”);
                    Add = false;
                }

                if (Sub) {

                    edittext1.setText(in1 – i2 + “”);
                    Sub = false;
                }

                if (Multiply) {
                    edittext1.setText(in1 * i2 + “”);
                    Multiply = false;
                }

                if (Divide) {
                    edittext1.setText(in1 / i2 + “”);
                    Divide = false;
                }
                if (Remainder) {
                    edittext1.setText(in1 % i2 + “”);
                    Remainder = false;
                }
            }
        });

        button_Del.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                edittext1.setText(“”);
                in1 = 0.0;
                i2 = 0.0;
            }
        });

        button_Dot.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (deci) {
                    //do nothing or you can show the error
                } else {
                    edittext1.setText(edittext1.getText() + “.”);
                    deci = true;
                }

            }
        });

    }
}

calculator.xml:

<?xml version="1.0" encoding="utf-8"?>

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



    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:background="#ecf0f1"

    android:orientation="vertical">





    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_weight="0.3"

        android:orientation="horizontal">



        <TextView

            android:id="@+id/display"

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:background="#ecf0f1"

            android:textSize="30sp" />

    </LinearLayout>



    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_weight="0.2"

        android:orientation="horizontal">



        <Button

            android:id="@+id/buttonDel"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="Del"

            android:textColor="#ecf0f1"

            android:textSize="20sp" />



        <Button

            android:id="@+id/buttoneql"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="Answer"

            android:textColor="#ecf0f1"

            android:textSize="30sp" />



    </LinearLayout>



    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_weight="0.2"

        android:orientation="horizontal">



        <Button

            android:id="@+id/b1"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="1"

            android:textColor="#ecf0f1"

            android:textSize="20sp" />



        <Button

            android:id="@+id/b2"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="2"

            android:textColor="#ecf0f1"

            android:textSize="20sp" />



        <Button

            android:id="@+id/b3"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="3"

            android:textColor="#ecf0f1"

            android:textSize="20sp" />



        <Button

            android:id="@+id/biv"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="/"

            android:textColor="#ecf0f1"

            android:textSize="30sp" />



    </LinearLayout>



    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_weight="0.2"

        android:orientation="horizontal">



        <Button

            android:id="@+id/b4"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="4"

            android:textColor="#ecf0f1"

            android:textSize="20sp" />



        <Button

            android:id="@+id/b5"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="5"

            android:textColor="#ecf0f1"

            android:textSize="20sp" />



        <Button

            android:id="@+id/b6"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="6"

            android:textColor="#ecf0f1"

            android:textSize="20sp" />



        <Button

            android:id="@+id/bsub"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="-"

            android:textColor="#ecf0f1"

            android:textSize="30sp" />



    </LinearLayout>



    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_weight="0.2"

        android:orientation="horizontal">



        <Button

            android:id="@+id/b7"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="7"

            android:textColor="#ecf0f1"

            android:textSize="20sp" />



        <Button

            android:id="@+id/b8"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="8"

            android:textColor="#ecf0f1"

            android:textSize="20sp" />



        <Button

            android:id="@+id/b9"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="9"

            android:textColor="#ecf0f1"

            android:textSize="20sp" />



        <Button

            android:id="@+id/bmul"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="x"

            android:textColor="#ecf0f1"

            android:textSize="30sp" />



    </LinearLayout>



    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_weight="0.2"

        android:orientation="horizontal">



        <Button

            android:id="@+id/bDot"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="."

            android:textColor="#ecf0f1"

            android:textSize="20sp" />



        <Button

            android:id="@+id/b0"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="0"

            android:textColor="#ecf0f1"

            android:textSize="20sp" />



        <Button

            android:id="@+id/BRemain"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:text="%"

            android:textColor="#ecf0f1"

            android:textSize="30sp" />



        <Button

            android:id="@+id/badd"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_margin="1dp"

            android:layout_weight="0.25"

            android:background="#ED6996"

            android:onClick="onClick"

            android:text="+"

            android:textColor="#ecf0f1"

            android:textSize="30sp" />



    </LinearLayout>


</LinearLayout>

Output:

This image has an empty alt attribute; its file name is image-4.png
This image has an empty alt attribute; its file name is image-5.png

I Think You Understand above Topic “Easy and Excellent Source Code of Calculator App”.
For any query or suggestions feel free to fill comment section and send it


You may also like...

Leave a Reply

Your email address will not be published. Required fields are marked *