Addition Application For Android

Introduction

Ninety percent of people use Android smartphones. I will show you how to create an addition application for Android using Android studio. Android is a kernel based operating system. It allows the user to modify the GUI components and source code.

Requirements

Android studio
Little bit of XML and JAVA Knowledge.

Download link (android studio) https://developer.android.com/studio/

Steps should be followed

Carefully follow my steps on how to create the addition application for android using android studio and I have included the source code below.

Step 1

Open Android studio start the new project.

Step 2

Put the application name and company domain. If you wish to use c++ for code the project, Include c++ support then click next.

Step 3

Select the android minimum SDK. After you chose the minimum SDK it will show approximate percentage of people who use that sdk then click next.

Step 4

Choose the basic activity then click next

Step 5

Put the activity name and layout name. Android studio basically takes the java class name from what you provide as the activity name.

Step 6

Goto activity_layout.xml then click the text bottom. Into the activity_layout.xml copy and paste the below code.

activity_layout.xml code

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/relativeLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="ADDITION"
android:textSize="20dp" >
</TextView>
</LinearLayout>
<LinearLayout
android:id="@+id/linearLayout2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/linearLayout1" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ENTER NO 1" >
</TextView>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.20"
android:id="@+id/edittext1"
android:inputType="number">
</EditText>
</LinearLayout>
<LinearLayout
android:id="@+id/linearLayout3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/linearLayout2" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ENTER NO 2" >
</TextView>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.20"
android:id="@+id/edittext2"
android:inputType="number">
</EditText>
</LinearLayout>
<LinearLayout
android:id="@+id/linearLayout4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/linearLayout3" >
<Button
android:layout_width="wrap_content"
android:id="@+id/button1"
android:layout_height="wrap_content"
android:text="Addition"
android:layout_weight="0.50" />
<Button
android:layout_width="wrap_content"
android:id="@+id/button3"
android:layout_height="wrap_content"
android:text="subtraction"
android:layout_weight="0.50" />
<Button
android:layout_width="wrap_content"
android:id="@+id/button2"
android:layout_height="wrap_content"
android:text="CLEAR"
android:layout_weight="0.50" />
</LinearLayout>
<View
android:layout_height="2px"
android:layout_width="fill_parent"
android:layout_below="@+id/linearLayout4"
android:background="#DDFFDD"/>
</RelativeLayout>

Step 7

This is our user interface of the application

Step 8

Go to LayoutActivity.java then click the text bottom. Into the LayoutActivity.java copy and paste the below code. Do not replace your package name.

LayoutActivity.java code

package ganeshannt.layout;
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.Toast;
public class LayoutActivity extends Activity {
/** Called when the activity is first created. */
EditText txtData1,txtData2;
float num1,num2,result1,result2;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_layout);
Button add = (Button) findViewById(R.id.button1);
add.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
try
{
txtData1 = (EditText) findViewById(R.id.edittext1);
txtData2 = (EditText) findViewById(R.id.edittext2);
num1 = Float.parseFloat(txtData1.getText().toString());
num2 = Float.parseFloat(txtData2.getText().toString());
result1=num1+num2;
Toast.makeText(getBaseContext(),"ANSWER:"+result1,Toast.LENGTH_SHORT).show();
}
catch(Exception e)
{
Toast.makeText(getBaseContext(), e.getMessage(),
Toast.LENGTH_SHORT).show();
}
}
});
Button sub = (Button) findViewById(R.id.button3);
sub.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
try
{
txtData1 = (EditText) findViewById(R.id.edittext1);
txtData2 = (EditText) findViewById(R.id.edittext2);
num1 = Float.parseFloat(txtData1.getText().toString());
num2 = Float.parseFloat(txtData2.getText().toString());
result2=num1-num2;
Toast.makeText(getBaseContext(),"ANSWER:"+result2,Toast.LENGTH_SHORT).show();
}
catch(Exception e)
{
Toast.makeText(getBaseContext(), e.getMessage(),
Toast.LENGTH_SHORT).show();
}
}
});
Button clear = (Button) findViewById(R.id.button2);
clear.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
try
{
txtData1.setText("");
txtData2.setText("");
}
catch(Exception e)
{
Toast.makeText(getBaseContext(), e.getMessage(),
Toast.LENGTH_SHORT).show();
}
}
});
}
}

Step 9

Click the build bottom and make the project. Now your project compilation process is going on. It will show you any error found in your project

Step 10

Click run bottom. Your emulator will start then run your application.

Deliverables

Here we have successfully created addition application for android using android studio

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