AIDE Tutorial - 54 Simple Calculator

AIDE Tutorial - 54 Simple Calculator
Watch the video below Main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"  >

<EditText
android:id="@+id/edittext1"
android:inputType="number|numberDecimal"
android:layout_width="match_parent"        android:layout_height="wrap_content" />

<EditText
android:layout_below="@+id/edittext1"
android:id="@+id/edittext2"
android:inputType="number|numberDecimal"
android:layout_width="match_parent"        android:layout_height="wrap_content" />

<Button
android:layout_below="@+id/edittext2"
android:id="@+id/add"
android:text="Add"
android:layout_width="wrap_content"        android:layout_height="wrap_content" />

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

<Button
android:layout_below="@+id/subtract"
android:id="@+id/multiply"
android:text="Multiply"
android:layout_width="wrap_content"      android:layout_height="wrap_content" />

<Button
android:layout_below="@+id/multiply"
android:id="@+id/divide"
android:text="Divide"
android:layout_width="wrap_content"        android:layout_height="wrap_content" />

    <TextView
android:id="@+id/mainTextView"
android:layout_below="@+id/divide"
        android:text=""
        android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
</RelativeLayout>

Main.xml

<RelativeLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"  >
<EditText
android:id="@+id/edittext1"
android:inputType="number|numberDecimal"
android:layout_width="match_parent"        
android:layout_height="wrap_content" />
<EditText
android:layout_below="@+id/edittext1"
android:id="@+id/edittext2"
android:inputType="number|numberDecimal"
android:layout_width="match_parent"        
android:layout_height="wrap_content" />
<Button
android:layout_below="@+id/edittext2"
android:id="@+id/add"
android:text="Add"
android:layout_width="wrap_content"        
android:layout_height="wrap_content" />
<Button
android:layout_below="@+id/add"
android:id="@+id/subtract"
android:text="Subtract"
android:layout_width="wrap_content"        
android:layout_height="wrap_content" />
<Button
android:layout_below="@+id/subtract"
android:id="@+id/multiply"
android:text="Multiply"
android:layout_width="wrap_content"      
android:layout_height="wrap_content" />
<Button
android:layout_below="@+id/multiply"
android:id="@+id/divide"
android:text="Divide"
android:layout_width="wrap_content"        
android:layout_height="wrap_content" />
    <TextView
android:id="@+id/mainTextView"
android:layout_below="@+id/divide"
        android:text=""
        android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
</RelativeLayout>

MainActivity.java
package com.kcgroup.simplecalculator;

import android.app.*;
import android.os.*;
import android.widget.*;
import android.view.*;

public class MainActivity extends Activity
{ private Button btnadd, btnsub, btnmul, btndiv;
private EditText et1,et2;
private TextView tv;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
btnadd=(Button)findViewById(R.id.add);
btnsub=(Button)findViewById(R.id.subtract);
btnmul=(Button)findViewById(R.id.multiply);
btndiv=(Button)findViewById(R.id.divide);
et1=(EditText)findViewById(R.id.edittext1);
et2=(EditText)findViewById(R.id.edittext2);
tv=(TextView)findViewById(R.id.mainTextView);

btnadd.setOnClickListener(new View.OnClickListener(){

@Override
public void onClick(View p1)
{
double a=Double.parseDouble(et1.getText().toString());
double b=Double.parseDouble(et2.getText().toString());
double result=a+b;
tv.setText(String.valueOf(result));

// TODO: Implement this method
} });

btnsub.setOnClickListener(new View.OnClickListener(){

@Override
public void onClick(View p1)
{
double a=Double.parseDouble(et1.getText().toString());
double b=Double.parseDouble(et2.getText().toString());
double result=a-b;
tv.setText(String.valueOf(result));

// TODO: Implement this method
} });

btnmul.setOnClickListener(new View.OnClickListener(){

@Override
public void onClick(View p1)
{
double a=Double.parseDouble(et1.getText().toString());
double b=Double.parseDouble(et2.getText().toString());
double result=a*b;
tv.setText(String.valueOf(result));

// TODO: Implement this method
} });

btndiv.setOnClickListener(new View.OnClickListener(){

@Override
public void onClick(View p1)
{
double a=Double.parseDouble(et1.getText().toString());
double b=Double.parseDouble(et2.getText().toString());
double result=a/b;
tv.setText(String.valueOf(result)); } });
  }}