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Android Scientific Calculator

calculator SciFi

Click here to download a powerful android scientific calculator from mogtech.

Click to watch how the calculator was created.

 Following the video tutorial, you will learn how to successfully work with android layouts.
Click to watch the video tutorial on how the calculator was created.


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The XML file for this calculator is below

<?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:layout_width="match_parent"
    android:layout_height="fill_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="horizontal"
    tools:context="com.wordpress.mogtechsoftworks.scificalculator.MainActivity">

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:orientation="vertical">

        <EditText
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:inputType="number"
            android:ems="10"
            android:id="@+id/editText"
            android:layout_weight="10"
            android:hint="Enter a number"
            android:textSize="25dp"
            android:layout_gravity="top" />

        <LinearLayout
            android:orientation="vertical"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:weightSum="1"
            android:layout_weight="1.5"
            android:layout_gravity="top|left|bottom|right"
            android:gravity="fill_horizontal|start|fill_vertical|end">

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="0dp"
                android:weightSum="0"
                android:layout_gravity="top|left|bottom|right"
                android:layout_weight="0.13">

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="1"
                    android:id="@+id/btn1"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_weight="1"
                    android:layout_gravity="top|left|bottom|right" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="2"
                    android:id="@+id/btn2"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_weight="1"
                    android:layout_gravity="top|left|bottom|right" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="3"
                    android:id="@+id/btn3"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_weight="1"
                    android:layout_gravity="top|left|bottom|right" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="4"
                    android:id="@+id/btn4"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_weight="1"
                    android:layout_gravity="top|left|bottom|right" />

            </LinearLayout>
            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="0dp"
                android:layout_gravity="top|left|bottom|center|right"
                android:weightSum="0"
                android:layout_weight="0.13">

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="5"
                    android:id="@+id/btn5"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_gravity="left"
                    android:layout_weight="1" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="6"
                    android:id="@+id/btn6"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_gravity="left"
                    android:layout_weight="1" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="7"
                    android:id="@+id/btn7"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_gravity="left"
                    android:layout_weight="1" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="8"
                    android:id="@+id/btn8"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_gravity="left"
                    android:layout_weight="1" />

            </LinearLayout>
            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="0dp"
                android:layout_gravity="top|left|bottom|center|right"
                android:weightSum="0"
                android:layout_weight="0.13">

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="9"
                    android:id="@+id/btn9"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:layout_weight="1"
                    android:layout_gravity="left"
                    android:gravity="center_vertical|center_horizontal" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="0"
                    android:id="@+id/btn0"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:layout_weight="1"
                    android:layout_gravity="left"
                    android:gravity="center_vertical|center_horizontal" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="."
                    android:id="@+id/dot"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:layout_weight="1"
                    android:layout_gravity="left"
                    android:gravity="center_vertical|center_horizontal" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="Ce"
                    android:id="@+id/Ce"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:layout_weight="1"
                    android:layout_gravity="left"
                    android:gravity="center_vertical|center_horizontal" />

            </LinearLayout>
            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="0dp"
                android:layout_gravity="top|left|bottom|center|right"
                android:weightSum="0"
                android:layout_weight="0.13">

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="+"
                    android:id="@+id/add"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_weight="1"
                    android:layout_gravity="left" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="-"
                    android:id="@+id/subt"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_weight="1"
                    android:layout_gravity="left" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="*"
                    android:id="@+id/mult"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_weight="1"
                    android:layout_gravity="left" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="C"
                    android:id="@+id/C"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_weight="1"
                    android:layout_gravity="left" />

            </LinearLayout>
            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="0dp"
                android:layout_gravity="top|left|bottom|center|right"
                android:weightSum="0"
                android:layout_weight="0.13">

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="/"
                    android:id="@+id/div"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:layout_gravity="left"
                    android:layout_weight="1"
                    android:gravity="center_vertical|center_horizontal" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="Cos"
                    android:id="@+id/cos"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:layout_gravity="left"
                    android:layout_weight="1"
                    android:gravity="center_vertical|center_horizontal" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="Sin"
                    android:id="@+id/sin"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:layout_gravity="left"
                    android:layout_weight="1"
                    android:gravity="center_vertical|center_horizontal" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="Tan"
                    android:id="@+id/tan"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:layout_gravity="left"
                    android:layout_weight="1"
                    android:gravity="center_vertical|center_horizontal" />

            </LinearLayout>
            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="0dp"
                android:layout_gravity="top|left|bottom|center|right"
                android:weightSum="0"
                android:layout_weight="0.13">

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="Sinh"
                    android:id="@+id/sinh"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_gravity="left"
                    android:layout_weight="1" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="Cosh"
                    android:id="@+id/cosh"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_gravity="left"
                    android:layout_weight="1" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="Tanh"
                    android:id="@+id/tanh"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_gravity="left"
                    android:layout_weight="1" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="Log"
                    android:id="@+id/log"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_gravity="left"
                    android:layout_weight="1" />

            </LinearLayout>

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="0dp"
                android:layout_gravity="top|left|bottom|center|right"
                android:weightSum="0"
                android:layout_weight="0.13">

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="Pow"
                    android:id="@+id/exp"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:layout_gravity="left"
                    android:layout_weight="1"
                    android:gravity="center_vertical|center_horizontal" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="Sqrt"
                    android:id="@+id/sqrt"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:layout_gravity="left"
                    android:layout_weight="1"
                    android:gravity="center_vertical|center_horizontal" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="Rad"
                    android:id="@+id/rad"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:layout_gravity="left"
                    android:layout_weight="1"
                    android:gravity="center_vertical|center_horizontal" />

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:text="Deg"
                    android:id="@+id/deg"
                    android:textSize="25dp"
                    android:width="90dp"
                    android:layout_gravity="left"
                    android:layout_weight="1"
                    android:gravity="center_vertical|center_horizontal" />



            </LinearLayout>
            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="0dp"
                android:layout_gravity="top|left|bottom|center|right"
                android:weightSum="0"
                android:layout_weight="0.13">

                <Button
                    style="?android:attr/buttonStyleSmall"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:text="%"
                    android:id="@+id/perc"
                    android:textSize="25dp"
                    android:layout_gravity="left"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_weight="3" />

               <Button
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:text="="
                    android:id="@+id/equals"
                    android:textStyle="bold"
                    android:textSize="30dp"
                    android:gravity="center_vertical|center_horizontal"
                    android:layout_gravity="left"
                   android:layout_weight="1" />
            </LinearLayout>

        </LinearLayout>
    </LinearLayout>
</RelativeLayout>
 
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The Java code is


 


package com.wordpress.mogtechsoftworks.scificalculator;

import android.support.v7.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 {

    EditText txtAnswer;
    Button btn1, btn2,btn3, btn4,btn5,btn6,btn7,btn8,btn9,btn0,btnStop,btnTanh,btnCosh,btnCoth,btnSqr;
    Button btnAdd, btnSubt,btnMult,btnEquals,btnSin,btnCos,btnTan,btnCe,btnC,btnDiv,btnPerc,btnLog,btnReg, btnDeg,btnExp;
    Double Answer; Double Val2 =0.0; Double Val1 =0.1;
    String Sign; boolean solved = false; boolean solvedWithouEqu = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        AddOnclickListenersForButton();
    }
    private void AddOnclickListenersForButton(){
        txtAnswer = (EditText) findViewById(R.id.editText);
        btn0=(Button)findViewById(R.id.btn0);btn1=(Button)findViewById(R.id.btn1);
        btn2=(Button)findViewById(R.id.btn2);btn3=(Button)findViewById(R.id.btn3);
        btn4=(Button)findViewById(R.id.btn4);btn5=(Button)findViewById(R.id.btn5);
        btn6=(Button)findViewById(R.id.btn6);btn7=(Button)findViewById(R.id.btn7);
        btn9=(Button)findViewById(R.id.btn9);btn8=(Button)findViewById(R.id.btn8);
        btnC=(Button)findViewById(R.id.C);btnCe=(Button)findViewById(R.id.Ce);
        btnCos=(Button)findViewById(R.id.cos);btnTan=(Button)findViewById(R.id.tan);
        btnEquals=(Button)findViewById(R.id.equals);btnPerc=(Button)findViewById(R.id.perc);
        btnDiv=(Button)findViewById(R.id.div);btnAdd=(Button)findViewById(R.id.add);
        btnSubt=(Button)findViewById(R.id.subt);btnLog=(Button)findViewById(R.id.log);
        btnStop=(Button)findViewById(R.id.dot);btnMult=(Button)findViewById(R.id.mult);
        btnTanh=(Button)findViewById(R.id.tanh);btnCoth=(Button)findViewById(R.id.sinh);
        btnCosh=(Button)findViewById(R.id.cosh);btnSqr=(Button)findViewById(R.id.sqrt);
        btnSin=(Button)findViewById(R.id.sin);btnExp=(Button)findViewById(R.id.exp);
        btnDeg=(Button)findViewById(R.id.deg);btnReg=(Button)findViewById(R.id.rad);


        btn0.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(solved==true || solvedWithouEqu==true){txtAnswer.setText(""); solved=false;solvedWithouEqu=false;}
                txtAnswer.setText(txtAnswer.getText().toString() +  btn0.getText().toString());
            }
        });
        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(solved==true || solvedWithouEqu==true){txtAnswer.setText(""); solved=false;solvedWithouEqu=false;}
                txtAnswer.setText(txtAnswer.getText().toString() +  btn1.getText().toString());
            }
        });
        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(solved==true || solvedWithouEqu==true){txtAnswer.setText(""); solved=false;solvedWithouEqu=false;}
                txtAnswer.setText(txtAnswer.getText().toString() +  btn2.getText().toString());
            }
        });
        btn3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(solved==true || solvedWithouEqu==true){txtAnswer.setText(""); solved=false;solvedWithouEqu=false;}
                txtAnswer.setText(txtAnswer.getText().toString() +  btn3.getText().toString());
            }
        });
        btn4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(solved==true || solvedWithouEqu==true){txtAnswer.setText(""); solved=false;solvedWithouEqu=false;}
                txtAnswer.setText(txtAnswer.getText().toString() +  btn4.getText().toString());
            }
        });
        btn5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(solved==true || solvedWithouEqu==true){txtAnswer.setText(""); solved=false;solvedWithouEqu=false;}
                txtAnswer.setText(txtAnswer.getText().toString() +  btn5.getText().toString());
            }
        });
        btn6.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(solved==true || solvedWithouEqu==true){txtAnswer.setText(""); solved=false;solvedWithouEqu=false;}
                txtAnswer.setText(txtAnswer.getText().toString() +  btn6.getText().toString());
            }
        });
        btn7.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(solved==true || solvedWithouEqu==true){txtAnswer.setText(""); solved=false;solvedWithouEqu=false;}
                txtAnswer.setText(txtAnswer.getText().toString() +  btn7.getText().toString());
            }
        });
        btn8.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(solved==true || solvedWithouEqu==true){txtAnswer.setText(""); solved=false;solvedWithouEqu=false;}
                txtAnswer.setText(txtAnswer.getText().toString() +  btn8.getText().toString());
            }
        });
        btn9.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(solved==true || solvedWithouEqu==true){txtAnswer.setText(""); solved=false;solvedWithouEqu=false;}
                txtAnswer.setText(txtAnswer.getText().toString() +  btn9.getText().toString());
            }
        });
        btnStop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(solved==true || solvedWithouEqu==true){txtAnswer.setText(""); solved=false;solvedWithouEqu=false;}
                txtAnswer.setText(txtAnswer.getText().toString() +  btnStop.getText().toString());
            }
        });
        btnAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try{
                    if (Val2==0.0){
                        Val1=Double.parseDouble(txtAnswer.getText().toString()) ;
                        txtAnswer.setText(""); Sign="+";Val2=Double.parseDouble("1");
                    }
                    else {
                        Val1=Val1 + Double.parseDouble(txtAnswer.getText().toString())  ;
                        txtAnswer.setText(Val1.toString()); Sign="+";solvedWithouEqu=true;}
                }
                catch (Exception ex) {txtAnswer.setText("0");}
                finally {

                }
              }
        });
        btnSubt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try{
                    if (Val2==0.0){
                        Val1=Double.parseDouble(txtAnswer.getText().toString()) ;
                        txtAnswer.setText(""); Sign="-";Val2=Double.parseDouble("1");
                    }
                    else {
                        Val1=Val1 - Double.parseDouble(txtAnswer.getText().toString())  ;
                        txtAnswer.setText(Val1.toString()); Sign="-";solvedWithouEqu=true;
                    }
                }
                catch (Exception ex) {txtAnswer.setText("0");}
                finally {

                }

            }
        });
        btnC.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                txtAnswer.setText("");Val2=0.0; Val1=0.0;
            }
        });
        btnCe.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try{
                    int i= txtAnswer.getText().length();
                    txtAnswer.setText(txtAnswer.getText().subSequence(0,i-1));
                    if (txtAnswer.getText()==null){Val1=0.0;}
                }
                catch (Exception ex) {txtAnswer.setText("");}
                finally {

                }


            }
        });
        btnDiv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try{
                    if (Val2==0.0){
                        Val1=Double.parseDouble(txtAnswer.getText().toString()) ;
                        txtAnswer.setText(""); Sign="/";Val2=Double.parseDouble("1");
                    }
                    else {
                        Val1=Val1 / Double.parseDouble(txtAnswer.getText().toString())  ;
                        txtAnswer.setText(Val1.toString()); Sign="/";solvedWithouEqu=true;
                    }
                }
                catch (Exception ex) {txtAnswer.setText("0");}
                finally {

                }

            }
        });
        btnMult.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try{
                    if (Val2==0.0){
                        Val1=Double.parseDouble(txtAnswer.getText().toString()) ;
                        txtAnswer.setText(""); Sign="*";Val2=Double.parseDouble("1");
                    }
                    else {
                        Val1=Val1 * Double.parseDouble(txtAnswer.getText().toString())  ;
                        txtAnswer.setText(Val1.toString()); Sign="*";solvedWithouEqu=true;
                    }
                }
                catch (Exception ex) {txtAnswer.setText("0");}
                finally {

                }

            }
        });
        btnExp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try{
                    if (Val2==0.0){
                        Val1=Double.parseDouble(txtAnswer.getText().toString()) ;
                        txtAnswer.setText(""); Sign="^";Val2=Double.parseDouble("1");
                    }
                    else {
                        Val1=Math.pow(Val1, Double.parseDouble(txtAnswer.getText().toString()))  ;
                        txtAnswer.setText(Val1.toString()); Sign="^";solvedWithouEqu=true;
                    }
                }
                catch (Exception ex) {txtAnswer.setText("0");}
                finally {

                }

            }
        });
        btnPerc.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try{
                    if (Val2==0.0){
                        Val1=Double.parseDouble(txtAnswer.getText().toString()) ;
                        txtAnswer.setText(""); Sign="%";Val2=Double.parseDouble("1");
                    }
                    else {
                        Val1 = Val1 * (Double.parseDouble(txtAnswer.getText().toString()) / 100);
                        txtAnswer.setText(Val1.toString());
                        Sign = "%";
                        solvedWithouEqu = true;
                    }
                }
                catch (Exception ex) {txtAnswer.setText("0");}
                finally {

                }

            }
        });
        btnLog.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                try{
                    Answer=Math.log(Double.parseDouble(txtAnswer.getText().toString()));
                    Val2=0.0; Val1=0.0;
                    txtAnswer.setText(Answer.toString());solvedWithouEqu=true;
                }
                catch (Exception ex) {txtAnswer.setText("0");}
                finally {

                }

            }
        });
        btnSin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                try{
                    Answer=Math.sin(Double.parseDouble(txtAnswer.getText().toString()));
                    Val2=0.0; Val1=0.0;
                    txtAnswer.setText(Answer.toString());solvedWithouEqu=true;
                }
                catch (Exception ex) {txtAnswer.setText("0");}
                finally {

                }

            }
        });
        btnCos.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                try{

                    Answer=Math.cos(Double.parseDouble(txtAnswer.getText().toString()));
                    Val2=0.0; Val1=0.0;
                    txtAnswer.setText(Answer.toString());solvedWithouEqu=true;
                }
                catch (Exception ex) {txtAnswer.setText("0");}
                finally {

                }

            }
        });
        btnTan.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                try{
                    Answer=Math.tan(Double.parseDouble(txtAnswer.getText().toString()));
                    Val2=0.0; Val1=0.0;
                    txtAnswer.setText(Answer.toString());solvedWithouEqu=true;

                }
                catch (Exception ex) {txtAnswer.setText("0");}
                finally {

                }

            }
        });
        btnCoth.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                try{
                    Answer=Math.sinh(Double.parseDouble(txtAnswer.getText().toString()));
                    Val2=0.0; Val1=0.0;
                    txtAnswer.setText(Answer.toString());solvedWithouEqu=true;

                }
                catch (Exception ex) {txtAnswer.setText("0");}
                finally { }

            }
        });
        btnCosh.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                try{
                    Answer=Math.cosh(Double.parseDouble(txtAnswer.getText().toString()));
                    Val2=0.0; Val1=0.0;
                    txtAnswer.setText(Answer.toString());solvedWithouEqu=true;
                }
                catch (Exception ex) {txtAnswer.setText("0");}
                finally { }

            }
        });
        btnTanh.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                try{
                    Answer=Math.tanh(Double.parseDouble(txtAnswer.getText().toString()));
                    Val2=0.0; Val1=0.0;
                    txtAnswer.setText(Answer.toString());solvedWithouEqu=true;

                }
                catch (Exception ex) {txtAnswer.setText("0");}
                finally {

                }

            }
        });

        btnReg.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                try{
                    Answer=Math.toRadians(Double.parseDouble(txtAnswer.getText().toString()));
                    Val2=0.0; Val1=0.0;
                    txtAnswer.setText(Answer.toString());solvedWithouEqu=true;
                }
                catch (Exception ex) {txtAnswer.setText("0");}
                finally {

                }

            }
        });

        btnDeg.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                try{
                    Answer=Math.toDegrees(Double.parseDouble(txtAnswer.getText().toString()));
                    Val2=0.0; Val1=0.0;
                    txtAnswer.setText(Answer.toString());solvedWithouEqu=true;

                }
                catch (Exception ex) {txtAnswer.setText("0");}
                finally {

                }

            }
        });

        btnEquals.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try{
                    Val2=Double.parseDouble(txtAnswer.getText().toString());
                    switch (Sign){
                        case  "+":Answer=Val1 + Val2; break;
                        case  "-":Answer=Val1 - Val2; break;
                        case  "*":Answer=Val1 * Val2; break;
                        case  "/":Answer=Val1 / Val2; break;
                        case  "%":Answer=Val1 * (Val2/100); break;
                        case  "^":Answer=Math.pow(Val1, Val2); break;
                        default:
                    }
                    txtAnswer.setText(String.format(Answer.toString()));
                    Val2=0.0; Val1=0.0; solved=true; Sign="";
                }
                catch (Exception ex) {txtAnswer.setText("0");}
                finally {

                }

            }
        });

    }
}


 




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