Wednesday, 10 June 2015

Simple Maths function like Sum/Addition | Subtraction | Division | Multiplication | Calculator

5 comments
In this android example we see program for mathematics function like SUM or Addition of two numbers,Subtraction,Division,Multiplication just like a Calculator for android. In this android tutorial we write a very simple code to develop a simple calculator for android.let's see step by step android example

CREATE NEW ANDROID PROJECT:


Step 1: Write code into activity_main.xml


<?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" >

    <TextView

        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="Maths Function" />

    <EditText

        android:id="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="number" >

        <requestFocus />

    </EditText>

    <EditText

        android:id="@+id/editText2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="number" />

    <Button

        android:id="@+id/buttonsum"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Sum/Addition" />

     <Button

         android:id="@+id/buttonsub"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="Subtraction" />

     <Button

         android:id="@+id/buttondiv"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="Division" />

     <Button

         android:id="@+id/buttonmul"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="multiplication" />

    <TextView

        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Large Text"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>



Step 2: Write code into MainActivity.java


package dev.androidapplink.mathsfunapp;


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;
import android.widget.TextView;

public class MainActivity extends Activity {

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Create object
Button btnsum = (Button) findViewById(R.id.buttonsum);
Button btnsub = (Button) findViewById(R.id.buttonsub);
Button btndiv = (Button) findViewById(R.id.buttondiv);
Button btnmul = (Button) findViewById(R.id.buttonmul);
final EditText etv = (EditText) findViewById(R.id.editText1);
final EditText etv2 = (EditText) findViewById(R.id.editText2);
final TextView result = (TextView) findViewById(R.id.textView1);
// Create button click event
btnsum.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {
int x = new Integer(etv.getText().toString());
int y = new Integer(etv2.getText().toString());
int sum = x + y; //Perform Maths operation
result.setText("The ANS of " + x + " + " + y + " = " + sum);//print answer
}
});

btnsub.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {
int x = new Integer(etv.getText().toString());
int y = new Integer(etv2.getText().toString());
int sub = x - y; //Perform Maths operation
result.setText("The ANS of " + x + " - " + y + " = " + sub);//print answer
}
});

btndiv.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {
int x = new Integer(etv.getText().toString());
int y = new Integer(etv2.getText().toString());
int div = x / y; //Perform Maths operation
result.setText("The ANS of " + x + " / " + y + " = " + div);//print answer
}
});

btnmul.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {
int x = new Integer(etv.getText().toString());
int y = new Integer(etv2.getText().toString());
int mul = x * y; //Perform Maths operation
result.setText("The ANS of " + x + " * " + y + " = " + mul);//Print answer
}
});
}

}

NOTE: No need any special permission in AndroidManifest.xml


Step 3: Now Run Your Project:


Addition/Sum:

Subtraction:


Division:


Multiplication:


Download Project:


Search Result

5 comments :

  1. int x = new Integer(etv.getText().toString()); is this the only way to take input from the the user, and please explain why you put "new" in the begining plz...

    ReplyDelete
  2. Sir there is an Error in program :-
    error: Package R does not exist
    error: Package R does not exist
    Why it is coming when program is Run please give Solution.....

    ReplyDelete
    Replies
    1. in android studio there press alt+enter if not resolve then go to file and click invalid catch and restart then restart your android studio.

      Delete
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