Currency converter using Using Android Studio

This tutorial will teach you how to make make a Currency Converter  app Using Android Studio step by step.it will help you convert the currency easily.

We made the layout design in activity_main.xml

activity_main.xml

<?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:gravity="center"
    android:orientation="vertical"
    tools:context=".MainActivity">


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


        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Currency Converter"
            android:textSize="30sp" 
            />


    </LinearLayout>


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


        <EditText
            android:id="@+id/txtuname"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10"

            />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Enter the Username"


            />


    </LinearLayout>


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


        <EditText
            android:id="@+id/txt"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10"

            />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Messgae"


            />


    </LinearLayout>


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


        <Button
            android:id="@+id/btn1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@color/colorAccent"
            android:text="ADD"

            />


    </LinearLayout>


</LinearLayout>

MainActivity

package com.example.kobinath.currency;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {


    Spinner sp1,sp2;
    EditText ed1;
    Button b1;

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

        sp1 = findViewById(R.id.spfrom);
        sp2 = findViewById(R.id.spto);
        ed1 = findViewById(R.id.txtamt);


        String[] from = {"USD"};
        ArrayAdapter ad = new ArrayAdapter<String>(this,R.layout.support_simple_spinner_dropdown_item,from);
        sp1.setAdapter(ad);


        String[] to = {"Indian Rupees","Srilankan Rupees"};
        ArrayAdapter ad1 = new ArrayAdapter<String>(this,R.layout.support_simple_spinner_dropdown_item,to);
        sp2.setAdapter(ad1);


        b1 = findViewById(R.id.btn1);

        b1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Double tot;

                Double amt = Double.parseDouble(ed1.getText().toString());

                if(sp1.getSelectedItem().toString() == "USD" && sp2.getSelectedItem().toString() == "Indian Rupees")
                {
                    tot = amt * 70.0;
                    Toast.makeText(getApplicationContext(),tot.toString(),Toast.LENGTH_LONG).show();
                }
                else if(sp1.getSelectedItem().toString() == "USD" && sp2.getSelectedItem().toString() == "Srilankan Rupees")
                {
                    tot = amt * 179.0;
                    Toast.makeText(getApplicationContext(),tot.toString(),Toast.LENGTH_LONG).show();
                }
            }
        });
    }
}

I have attached the video tutorial below it will help you  to do this  step by step.