Mobile Application Development - Build your Mobile application Calculator in Android Studio Tool

 Hi guys, I am Prabakaran, Welcome to innovative codes academy, In this section we learn about

How to develop Mobile Calculator in Android Studio Tool? Using Rhino Library Package:

Rhino Library Package: https://github.com/F43nd1r/rhino-android

Google Fonts: https://fonts.google.com/

You want source code contact me:

innovativecodesacacademy1@gmail.com

watch full video, Any doubt or quires leave comment with your mail, I will chat with you.

JAVA Source Code:

MainActivity.java

package com.example.calculator_01;

import androidx.appcompat.app.AppCompatActivity;

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

import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;

public class MainActivity extends AppCompatActivity {
    Button btn0,btn1,btn2,btn3,btn4,btn5,btn6,btn7,btn8,btn9,

    btnBracket,btnClear,btnPercent,btnDivide,btnMultiplication,

    btnMinus,btnAddition,btnEqual,btnDot;

    TextView tvinput,tvoutput;
    String process;
    Boolean checkbracket=false;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn0 =findViewById(R.id.btn0);
        btn1 =findViewById(R.id.btn1);
        btn2 =findViewById(R.id.btn2);
        btn3 =findViewById(R.id.btn3);
        btn4 =findViewById(R.id.btn4);
        btn5 =findViewById(R.id.btn5);
        btn6 =findViewById(R.id.btn6);
        btn7 =findViewById(R.id.btn7);
        btn8 =findViewById(R.id.btn8);
        btn9 =findViewById(R.id.btn9);
        btnDivide =findViewById(R.id.btnDivide);
        btnAddition =findViewById(R.id.btnAddition);
        btnMinus =findViewById(R.id.btnSubtraction);
        btnMultiplication =findViewById(R.id.btnMultiply);
        btnPercent =findViewById(R.id.btnPercent);
        btnBracket =findViewById(R.id.btnBracket);
        btnClear =findViewById(R.id.btnclear);
        btnEqual =findViewById(R.id.btnEqual);
        btnDot =findViewById(R.id.btnDot);
        tvinput =findViewById(R.id.tvinput);
        tvoutput =findViewById(R.id.tvoutput);
 btnClear.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View v) {
        tvinput.setText("");
        tvoutput.setText("");
     }
 });
btn0.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        process =tvinput.getText().toString();
        tvinput.setText(process+"0");
    }
});
        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                process =tvinput.getText().toString();
                tvinput.setText(process+"1");
            }
        });
        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                process =tvinput.getText().toString();
                tvinput.setText(process+"2");
            }
        });
        btn3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                process =tvinput.getText().toString();
                tvinput.setText(process+"3");
            }
        });
        btn4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                process =tvinput.getText().toString();
                tvinput.setText(process+"4");
            }
        });
        btn5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                process =tvinput.getText().toString();
                tvinput.setText(process+"5");
            }
        });
        btn6.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                process =tvinput.getText().toString();
                tvinput.setText(process+"6");
            }
        });
        btn7.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                process =tvinput.getText().toString();
                tvinput.setText(process+"7");
            }
        });
        btn8.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                process =tvinput.getText().toString();
                tvinput.setText(process+"8");
            }
        });
        btn9.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                process =tvinput.getText().toString();
                tvinput.setText(process+"9");
            }
        });
        btnMultiplication.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                process =tvinput.getText().toString();
                tvinput.setText(process+"x");
            }
        });
        btnAddition.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                process =tvinput.getText().toString();
                tvinput.setText(process+"+");
            }
        });
        btnMinus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                process =tvinput.getText().toString();
                tvinput.setText(process+"-");
            }
        });
        btnDivide.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                process =tvinput.getText().toString();
                tvinput.setText(process+"÷");
            }
        });
        btnPercent.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                process =tvinput.getText().toString();
                tvinput.setText(process+"%");
            }
        });
        btnDot.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                process =tvinput.getText().toString();
                tvinput.setText(process+".");
            }
        });
        btnBracket.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(checkbracket)
                {
                    process =tvinput.getText().toString();
                    tvinput.setText(process+")");
                    checkbracket=false;
                }
                else
                    {
                        process =tvinput.getText().toString();
                        tvinput.setText(process+"(");
                        checkbracket=true;
                    }
            }
        });
        btnEqual.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
            process =tvinput.getText().toString();
            process =process.replaceAll("x","*");
            process =process.replaceAll("%","/100");
            process =process.replaceAll("÷","/");
                Context rhino = Context.enter();
                rhino.setOptimizationLevel(-1);
                String finalresult="";
                try {

                    Scriptable scriptable = rhino.initStandardObjects();
                    finalresult=rhino.evaluateString(scriptable,process,"javascript",1,null).toString();
                    }
                catch (Exception e)
                {
                    finalresult="0";
                }
                tvoutput.setText(finalresult);
            }
        });
    }
}

XML Source Code:
Below XML code for Connect the two file input.xml and buttons.xml in activity_main.xml
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:background="@color/white">

    <include
        layout="@layout/input"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <include
            layout="@layout/buttons"
            android:layout_height="wrap_content"
            android:layout_width="match_parent"
            />
    </RelativeLayout>
</LinearLayout>

Buttons Creations:
buttons.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="match_parent"
    android:layout_width="match_parent">
 <GridLayout
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:columnCount="6"
     android:rowCount="5">

     <Button
         android:id="@+id/btnclear"
         android:layout_height="100dp"
         android:layout_width="wrap_content"
         android:layout_row="0"
         android:layout_column="0"
         android:text="C"
         android:textSize="25sp"
         android:background="@color/white"
         android:textColor="@color/black"
         android:fontFamily="@font/got"
         />
     <Button
         android:id="@+id/btnBracket"
         android:layout_height="100dp"
         android:layout_width="wrap_content"
         android:layout_row="0"
         android:layout_column="1"
         android:text="()"
         android:textSize="25sp"
         android:background="@color/white"
         android:textColor="@color/black"
         android:fontFamily="@font/got"
         />
     <Button
         android:id="@+id/btnPercent"
         android:layout_height="100dp"
         android:layout_width="wrap_content"
         android:layout_row="0"
         android:layout_column="2"
         android:text="%"
         android:textSize="25sp"
         android:background="@color/white"
         android:textColor="@color/black"
         android:fontFamily="@font/got"
         />
     <Button
         android:id="@+id/btnDivide"
         android:layout_height="100dp"
         android:layout_width="wrap_content"
         android:layout_row="0"
         android:layout_column="3"
         android:text="÷"
         android:textSize="25sp"
         android:background="@color/white"
         android:textColor="@color/blue"
         android:fontFamily="@font/got"
         />
     <Button
         android:id="@+id/btn7"
         android:layout_height="100dp"
         android:layout_width="wrap_content"
         android:layout_row="1"
         android:layout_column="0"
         android:text="7"
         android:textSize="25sp"
         android:background="@color/white"
         android:textColor="@color/black"
         android:fontFamily="@font/got"
         />
     <Button
         android:id="@+id/btn8"
         android:layout_height="100dp"
         android:layout_width="wrap_content"
         android:layout_row="1"
         android:layout_column="1"
         android:text="8"
         android:textSize="25sp"
         android:background="@color/white"
         android:textColor="@color/black"
         android:fontFamily="@font/got"
         />

     <Button
         android:id="@+id/btn9"
         android:layout_width="wrap_content"
         android:layout_height="100dp"
         android:layout_row="1"
         android:layout_column="2"
         android:background="@color/white"
         android:fontFamily="@font/got"
         android:text="9"
         android:textColor="@color/black"
         android:textSize="25sp" />

     <Button
         android:id="@+id/btnMultiply"
         android:layout_height="100dp"
         android:layout_width="wrap_content"
         android:layout_row="1"
         android:layout_column="3"
         android:text="x"
         android:textSize="25sp"
         android:background="@color/white"
         android:textColor="@color/blue"
         android:fontFamily="@font/got"
         />
     <Button
     android:id="@+id/btn4"
     android:layout_height="100dp"
     android:layout_width="wrap_content"
     android:layout_row="2"
     android:layout_column="0"
     android:text="4"
     android:textSize="25sp"
     android:background="@color/white"
     android:textColor="@color/black"
     android:fontFamily="@font/got"
     />
     <Button
         android:id="@+id/btn5"
         android:layout_height="100dp"
         android:layout_width="wrap_content"
         android:layout_row="2"
         android:layout_column="1"
         android:text="5"
         android:textSize="25sp"
         android:background="@color/white"
         android:textColor="@color/black"
         android:fontFamily="@font/got"
         />
     <Button
         android:id="@+id/btn6"
         android:layout_height="100dp"
         android:layout_width="wrap_content"
         android:layout_row="2"
         android:layout_column="2"
         android:text="6"
         android:textSize="25sp"
         android:background="@color/white"
         android:textColor="@color/black"
         android:fontFamily="@font/got"
         />
     <Button
         android:id="@+id/btnSubtraction"
         android:layout_height="100dp"
         android:layout_width="wrap_content"
         android:layout_row="2"
         android:layout_column="3"
         android:text="-"
         android:textSize="25sp"
         android:background="@color/white"
         android:textColor="@color/blue"
         android:fontFamily="@font/got"
         />
     <Button
         android:id="@+id/btn1"
         android:layout_height="100dp"
         android:layout_width="wrap_content"
         android:layout_row="3"
         android:layout_column="0"
         android:text="1"
         android:textSize="25sp"
         android:background="@color/white"
         android:textColor="@color/black"
         android:fontFamily="@font/got"
         />

     <Button
         android:id="@+id/btn2"
         android:layout_width="wrap_content"
         android:layout_height="100dp"
         android:layout_row="3"
         android:layout_column="1"
         android:background="@color/white"
         android:fontFamily="@font/got"
         android:text="2"
         android:textColor="@color/black"
         android:textSize="25sp" />

     <Button
         android:id="@+id/btn3"
         android:layout_height="100dp"
         android:layout_width="wrap_content"
         android:layout_row="3"
         android:layout_column="2"
         android:text="3"
         android:textSize="25sp"
         android:background="@color/white"
         android:textColor="@color/black"
         android:fontFamily="@font/got"
         />
     <Button
         android:id="@+id/btnAddition"
         android:layout_height="100dp"
         android:layout_width="wrap_content"
         android:layout_row="3"
         android:layout_column="3"
         android:text="+"
         android:textSize="25sp"
         android:background="@color/white"
         android:textColor="@color/blue"
         android:fontFamily="@font/got"
         />
     <Button
         android:id="@+id/btn0"
         android:layout_height="100dp"
         android:layout_width="wrap_content"
         android:layout_row="4"
         android:layout_column="0"
         android:text="0"
         android:textSize="25sp"
         android:background="@color/white"
         android:textColor="@color/black"
         android:fontFamily="@font/got"
         />
     <Button
         android:id="@+id/btnDot"
         android:layout_height="100dp"
         android:layout_width="wrap_content"
         android:layout_row="4"
         android:layout_column="1"
         android:layout_columnSpan="2"
         android:layout_columnWeight="1"
         android:text="."
         android:textSize="25sp"
         android:background="@color/white"
         android:textColor="@color/black"
         android:fontFamily="@font/got"
         />
     <Button
         android:id="@+id/btnEqual"
         android:layout_height="100dp"
         android:layout_width="wrap_content"
         android:layout_row="4"
         android:layout_column="3"
         android:text="="
         android:textSize="25sp"
         android:background="@color/blue"
         android:textColor="@color/black"
         android:fontFamily="@font/got"
         />
 </GridLayout>
</RelativeLayout>

Input and Output Text Box Creation:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:background="@color/white"
    xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/tvinput"
    android:text=""
    android:textSize="30dp"
    android:textColor="@color/black"
    android:padding="20dp"
    android:gravity="end"
    android:fontFamily="@font/got"
    />
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tvoutput"
        android:text=""
        android:textSize="30dp"
        android:textColor="@color/black"
        android:padding="20dp"
        android:gravity="end"
        />
</LinearLayout>
AndroidManifest(File):
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.calculator_01">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>
Click on below link: 
https://youtu.be/rJhomr8b9c4
Android Studio Tool Download link given below:
---------------------------------------------------------------------------------------------------------------
https://developer.android.com/studio
Channel link:

https://www.youtube.com/channel/UCX1KgUr3ZA6cCR81qGGpA6g?sub_confirmation=1