Calculate Simple Interest in Android App

Activity_main.xml File

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

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

 xmlns:app="http://schemas.android.com/apk/res-auto"     

xmlns:tools="http://schemas.android.com/tools" 

 android:layout_width="match_parent"     

android:layout_height="match_parent"     

android:orientation="vertical" 

 tools:context=".MainActivity">

<TextView 

 android:layout_width="fill_parent"         

android:layout_height="wrap_content" 

 android:text="SImple Calculator"         

android:textAlignment="center" 

 android:textSize="30dp"        />
 

<TextView         

android:layout_width="fill_parent" 

 android:layout_height="wrap_content" 

 android:text="------------------------------------------" 

 android:textAlignment="center"         

android:textSize="30dp"  />

<EditText         

android:layout_width="fill_parent" 

 android:layout_height="wrap_content" 

 android:hint="Enter Amount"         

android:id="@+id/amt" 

 android:textAlignment="center" 

 android:inputType="number"/>

<EditText         

android:layout_width="fill_parent" 

 android:layout_height="wrap_content"         

android:hint="Enter Interest Rate (In %)" 

 android:id="@+id/interest"         

android:textAlignment="center" 

 android:inputType="number"/>

<EditText 

 android:layout_width="fill_parent"         

android:layout_height="wrap_content" 

 android:hint="Enter Time (in Year)"         

android:id="@+id/tim" 

 android:textAlignment="center" 

 android:inputType="number"        />

<Button 

 android:layout_width="wrap_content"         

android:layout_height="wrap_content"         

android:text="Calculate" 

 android:id="@+id/btn"        />

<TextView         

android:layout_width="fill_parent"         

android:layout_height="wrap_content" 

 android:id="@+id/txt1"         

android:textSize="30dp"        />

    
<TextView         

android:layout_width="fill_parent" 

 android:layout_height="wrap_content" 

 android:id="@+id/txt2" 

 android:textSize="20dp"        />

</LinearLayout>

MainActivity.Java File

 
package com.irawen.simpleinterest;
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;

public class MainActivity extends AppCompatActivity {

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

        OnCLick();
    }

    EditText amt,interest,time;
    Button btn;
    TextView txt1,txt2;

    public  void OnCLick()
    {
        amt=(EditText)findViewById(R.id.amt);
        interest=(EditText)findViewById(R.id.interest);
        time=(EditText)findViewById(R.id.tim);
        btn=(Button)findViewById(R.id.btn);
        txt1=(TextView)findViewById(R.id.txt1);
        txt2=(TextView)findViewById(R.id.txt2);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View v) {
                int a=Integer.parseInt(amt.getText().toString());
                int b=Integer.parseInt(interest.getText().toString());
                int c=Integer.parseInt(time.getText().toString());
                int d;
                d=(a*b*c)/100;
                int e=a+d;

                txt1.setText("Total Interest Is :"+String.valueOf(d));
                txt2.setText("Total Amount is : "+String.valueOf(e));

            }
        });
    }
}