Android Calculator

Screenshot

In this tutorial, it shows on how to create a calculator in android using eclipse.
How it works?

Open “res/layout/main.xml” file, to add textview, edittext and button widget.

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

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

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical" >

<EditText

android:id="@+id/etid"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:inputType="numberDecimal"

android:textSize="30dp"

android:textStyle="bold"

android:gravity="right"

android:hint="0" />

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:orientation="horizontal">

<Button

android:layout_width="225dp"

android:layout_height="wrap_content"

android:textSize="30dp"

android:enabled="false"

android:text="iCodeFree"/>

<Button

android:id="@+id/bcls"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:textSize="30dp"

android:textStyle="bold"

android:background="#100F12"

android:text="CLR"/>

</LinearLayout>

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:orientation="horizontal">

<Button

android:id="@+id/b7"

android:layout_width="75dp"

android:layout_height="wrap_content"

android:textSize="30dp"

android:text="7"/>

<Button

android:id="@+id/b8"

android:layout_width="75dp"

android:layout_height="wrap_content"

android:textSize="30dp"

android:text="8"/>

<Button

android:id="@+id/b9"

android:layout_width="75dp"

android:layout_height="wrap_content"

android:textSize="30dp"

android:text="9"/>

<Button

android:id="@+id/bdiv"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:textSize="30dp"

android:textStyle="bold"

android:background="#100F12"

android:text="÷"/>

</LinearLayout>

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:orientation="horizontal">

<Button

android:id="@+id/b4"

android:layout_width="75dp"

android:layout_height="wrap_content"

android:textSize="30dp"

android:text="4"/>

<Button

android:id="@+id/b5"

android:layout_width="75dp"

android:layout_height="wrap_content"

android:textSize="30dp"

android:text="5"/>

<Button

android:id="@+id/b6"

android:layout_width="75dp"

android:layout_height="wrap_content"

android:textSize="30dp"

android:text="6"/>

<Button

android:id="@+id/bmul"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:textSize="30dp"

android:textStyle="bold"

android:background="#100F12"

android:text="x"/>

</LinearLayout>

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:orientation="horizontal">

<Button

android:id="@+id/b1"

android:layout_width="75dp"

android:layout_height="wrap_content"

android:textSize="30dp"

android:text="1"/>

<Button

android:id="@+id/b2"

android:layout_width="75dp"

android:layout_height="wrap_content"

android:textSize="30dp"

android:text="2"/>

<Button

android:id="@+id/b3"

android:layout_width="75dp"

android:layout_height="wrap_content"

android:textSize="30dp"

android:text="3"/>

<Button

android:id="@+id/bsub"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:textSize="30dp"

android:textStyle="bold"

android:background="#100F12"

android:text="-"/>

</LinearLayout>

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:orientation="horizontal">

<Button

android:id="@+id/bdot"

android:layout_width="75dp"

android:layout_height="wrap_content"

android:textSize="30dp"

android:text="."/>

<Button

android:id="@+id/b0"

android:layout_width="75dp"

android:layout_height="wrap_content"

android:textSize="30dp"

android:text="0"/>

<Button

android:id="@+id/bequal"

android:layout_width="75dp"

android:layout_height="wrap_content"

android:textSize="30dp"

android:text="="/>

<Button

android:id="@+id/badd"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:textSize="30dp"

android:textStyle="bold"

android:background="#100F12"

android:text="+"/>

</LinearLayout>

2. Open java source program

package icodefree.android.calculator;

//programmer: Joemel E. Resare, MIT

//Eraser Software Solution

//http://iCodeFree.blogspot.com

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

public class CalculatorActivity extends Activity implements OnClickListener{

/** Called when the activity is first created. */

Button btn0, btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8, btn9;

Button btncls, btnequal, btnadd, btnsub, btnmul, btndiv, btndot;

EditText etdis;

String sval1, sval2;

double dval1, dval2, answ;

boolean booladd, boolsub, boolmul, booldiv;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

sval1="";

sval2="";

etdis=(EditText)findViewById(R.id.etid);

btn0=(Button)findViewById(R.id.b0);

btn1=(Button)findViewById(R.id.b1);

btn2=(Button)findViewById(R.id.b2);

btn3=(Button)findViewById(R.id.b3);

btn4=(Button)findViewById(R.id.b4);

btn5=(Button)findViewById(R.id.b5);

btn6=(Button)findViewById(R.id.b6);

btn7=(Button)findViewById(R.id.b7);

btn8=(Button)findViewById(R.id.b8);

btn9=(Button)findViewById(R.id.b9);

btndot=(Button) findViewById(R.id.bdot);

btncls=(Button)findViewById(R.id.bcls);

btnequal=(Button)findViewById(R.id.bequal);

btnadd=(Button)findViewById(R.id.badd);

btnsub=(Button)findViewById(R.id.bsub);

btnmul=(Button)findViewById(R.id.bmul);

btndiv=(Button)findViewById(R.id.bdiv);

btn0.setOnClickListener(this);

btn1.setOnClickListener(this);

btn2.setOnClickListener(this);

btn3.setOnClickListener(this);

btn4.setOnClickListener(this);

btn5.setOnClickListener(this);

btn6.setOnClickListener(this);

btn7.setOnClickListener(this);

btn8.setOnClickListener(this);

btn9.setOnClickListener(this);

btncls.setOnClickListener(this);

btnequal.setOnClickListener(this);

btnadd.setOnClickListener(this);

btnsub.setOnClickListener(this);

btnmul.setOnClickListener(this);

btndiv.setOnClickListener(this);

btndot.setOnClickListener(this);

}

public void onClick(View v) {

// TODO Auto-generated method stub

if(v.getId()==R.id.b0){

sval2 += "0";

}else if(v.getId()==R.id.b1){

sval2 += "1";

}else if(v.getId()==R.id.b2){

sval2 += "2";

}else if(v.getId()==R.id.b3){

sval2 += "3";

}else if(v.getId()==R.id.b4){

sval2 += "4";

}else if(v.getId()==R.id.b5){

sval2 += "5";

}else if(v.getId()==R.id.b6){

sval2 += "6";

}else if(v.getId()==R.id.b7){

sval2 += "7";

}else if(v.getId()==R.id.b8){

sval2 += "8";

}else if(v.getId()==R.id.b9){

sval2 += "9";

}else if(v.getId()==R.id.bdot){

sval2 += ".";

}else if(v.getId()==R.id.bcls){

sval2="";

sval1="";

}else if(v.getId()==R.id.badd){

sval1=sval2;

sval2="";

booladd=true;

}else if(v.getId()==R.id.bsub){

sval1=sval2;

sval2="";

boolsub=true;

}else if(v.getId()==R.id.bmul){

sval1=sval2;

sval2="";

boolmul=true;

}else if(v.getId()==R.id.bdiv){

sval1=sval2;

sval2="";

booldiv=true;

}

else if(v.getId()==R.id.bequal){

if(booladd==true){

dval1=Double.parseDouble(sval1);

dval2=Double.parseDouble(sval2);

answ=dval1 + dval2;

sval2=String.valueOf(answ).toString();

etdis.setText(sval2);

booladd=false;

return;

}else if(boolsub==true){

dval1=Double.parseDouble(sval1);

dval2=Double.parseDouble(sval2);

answ=dval1 - dval2;

sval2=String.valueOf(answ).toString();

etdis.setText(sval2);

boolsub=false;

return;

}if(boolmul==true){

dval1=Double.parseDouble(sval1);

dval2=Double.parseDouble(sval2);

answ=dval1 * dval2;

sval2=String.valueOf(answ).toString();

etdis.setText(sval2);

boolmul=false;

return;

}if(booldiv==true){

dval1=Double.parseDouble(sval1);

dval2=Double.parseDouble(sval2);

answ=dval1 / dval2;

sval2=String.valueOf(answ).toString();

etdis.setText(sval2);

booldiv=false;

return;

}

etdis.setText(sval2);

}

Programming Language/IDE: Java and XML / Eclipse Juno
Don't Forget To Give Credits To The One Who Originally Created

Click Here To Download Source Code

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