Simple Android Calculator

MainActivity.java

package kantapp.simplecalculator;

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;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity
{
    Button add,sub,mult,div,clear;
    EditText num1,num2;
    TextView result;

    int number1;
    int number2;
    int total;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        num1=(EditText)findViewById(R.id.num1);
        num2=(EditText)findViewById(R.id.num2);


            result = (TextView) findViewById(R.id.result);
            add = (Button) findViewById(R.id.add);
            add.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v)
                {
                    number1 = Integer.parseInt(num1.getText().toString());
                    number2 = Integer.parseInt(num2.getText().toString());

                    total = number1 + number2;

                    result.setText(Integer.toString(total));
                }
            });

            sub = (Button) findViewById(R.id.sub);
            sub.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    number1 = Integer.parseInt(num1.getText().toString());
                    number2 = Integer.parseInt(num2.getText().toString());

                    total = number1 - number2;

                    result.setText(Integer.toString(total));
                }
            });

            mult = (Button) findViewById(R.id.mult);
            mult.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    number1 = Integer.parseInt(num1.getText().toString());
                    number2 = Integer.parseInt(num2.getText().toString());

                    total = number1 * number2;

                    result.setText(Integer.toString(total));
                }
            });

            div = (Button) findViewById(R.id.div);
            div.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    number1 = Integer.parseInt(num1.getText().toString());
                    number2 = Integer.parseInt(num2.getText().toString());

                    if(number2==0)
                    {
                        Toast.makeText(MainActivity.this, "Please Enter Other Number", Toast.LENGTH_SHORT).show();
                    }
                    else
                    {
                        total = number1 / number2;

                        result.setText(Integer.toString(total));
                    }

                }
            });


            clear = (Button) findViewById(R.id.clear);
            clear.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    num1.setText("0");
                    num2.setText("0");
                }
            });

    }


}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="kantapp.simplecalculator.MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignEnd="@+id/num1"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_alignRight="@+id/num1"
        android:text="Enter Number 1 :"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <EditText
        android:id="@+id/num1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/textView"
        android:text="0" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/num1"
        android:text="Enter Number 2 :"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <EditText
        android:id="@+id/num2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"
        android:layout_below="@+id/textView2"
        android:text="0" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/add"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="+" />

        <Button
            android:id="@+id/sub"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="-" />

        <Button
            android:id="@+id/mult"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="*" />

        <Button
            android:id="@+id/div"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="/" />
    </LinearLayout>

    <Button
        android:id="@+id/clear"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="Clear" />

    <TextView
        android:id="@+id/result"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Result"
        android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="kantapp.simplecalculator">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        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>

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