The Ultimate Guide to Develop Currency Converter App

Quick Summary :- While doing business with foreign countries, you may need to deal with foreign currencies, convert them, price them, or quote them. How about developing a currency converter app? This article gives an in-depth insight into the strategy to develop a currency converter app.

Currency conversion tools are no longer optional, they’re essential today.

In a world where global transactions happen in seconds, the demand for accurate, real-time currency converter apps is growing fast. Businesses, travelers and fintech platforms need solutions that deliver instant exchange rates without errors or delays. 

Developing a currency converter app means creating a tool that connects users to live forex data, ensures smooth performance and offers an intuitive user experience. 

By the end of 2025, the global Currency Converter Apps market is projected to reach USD 1,302.4 million. The market is expected to grow further, hitting USD 2,692.68 million by 2033.

In this blog, we’ll break down what it takes to build a robust, future-ready currency converter app that meets modern needs.

Developing A Currency Converter App

Identify the Market Requirement For Currency Converter App

You should conduct a proper market research before planning to develop a currency converter app. It is because you have to know who your target audience is and what type of audience is going to use the application. Now, if the market requires an app that converts and offers an exchange rate, then your task becomes simpler.
But, if the demand is for sending the money after knowing the current conversion rate, then you have to build a currency converter application. The currency converter is more useful to travelers who are traveling across the borders.

They can know the real-time currency conversion rate with the use of the application. Without much hassle, they can easily move around. Besides, the competitor’s activity should be tracked as to what rates they are offering to sustain in the market.

Adding Value-Added Features

The point mentioned above focuses on converting money into domestic as well as an international currency. But, apart from it, there should be additional features to keep users engaged.

Let’s have a glance over it:

It should include a wide list of currencies so that you can cover a wide range of countries.

Building currency converter apps should focus on showing up-to-date exchange rates. But, an app owner should open up the gates for a wide variety of currencies across the globe. This will help them attract a horde of users.

It depends on you which and how many currencies you add in your app. If you have a large number of users from specific countries, then you can pin those country’s currency to avoid the hassle.

You can show real-time exchange rates to the users to make the experience seamless.

If the application is related to the currency converter, then it has to have real-time data or live updates that deliver precise and accurate results to the users. If the user wants to check the current rate of domestic or international currency and if the app won’t deliver the desired result, then there will be a negative impact on the application.

To overcome the challenge, you can build a currency converter app that shows real-time data. Also, you can add an offline functionality feature that can store the last live data when the app was connected to the internet.

There should be a graphical representation for delivering exact information to the users.

The currency converter application may contain more than 100s of currencies and to find and convert them to domestic currency would drain a lot of time. In this situation, you can add quick access and search for the history-based recommendations to your app.

This will increase the popularity and user-friendliness and save the time of the users. Now, users can quickly access their desired currency and get the result. Also, you can add graphical representation features that will allure the user and bring new users to the application.

Designing of Currency Converter Application

The designing of a currency converter application solely depends on the platform that you are targeting. Also, you have to consider that the app delivers only information, so there should not be heavy color combinations or inclusion of heavy designs or navigation features.

Just a simple application with minimalistic design and user-friendly functionality, that’s it. There are countable things that you can consider for the development of currency converter apps like currencies, calculators, and live exchange rates.

As you have seen the theoretical information for constructing a currency converter application, let’s see how you can build one technically:

The procedure of Developing Currency Converter Application

Open Android Studio, and go to File > New > Create a New Project. After creating it, you can name it as per your wish. We have named it a Currency Converter App.

After that, click on the next. The next page will be Target Android Device, wherein you have to select Form Factors and minimum SDK.

Here, you need to select the first tab, i.e., Phone & Tablet. In the drop-down, you have to select API 15: Android 4.0.3 (as shown in the image below). Selecting this API is because it covers almost 90% of the devices globally.

The core focus should be compatibility as the application should be compatible with all the Android devices.

After clicking Next, you have to select Add An Empty Activity. Click default and finish.

Here, the two files will be created, i.e., Activity_main.xml & MainActivity.java.  The source code will be put in Activity_main.xml and Java implementation in MainActivity.java.

Activity_main.xml

You can create a currency converter user interface either by copy-pasting the source code or follow below procedures:

You have to go to res folder > layout and then select activity_main.xml. Below is the XML code that you have to add to the Text menu.

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

<RelativeLayout 

   

   

   android:layout_width="match_parent"

   android:layout_height="match_parent"

   tools:context=".MainActivity">

   <TextView

       android:id="@+id/textview"

       android:layout_width="match_parent"

       android:layout_height="wrap_content"

       android:text="Enter Currency in dollars"

       android:textSize="20sp"/>

   <EditText

       android:id="@+id/edtText"

       android:layout_below="@+id/textview"

       android:layout_width="match_parent"

       android:layout_height="wrap_content"

       android:inputType="number"

       android:hint="Enter dollars"/>

   <Button

       android:id="@+id/button"

       android:layout_below="@+id/edtText"

       android:layout_width="wrap_content"

       android:layout_height="wrap_content"

       android:gravity="center"

       android:layout_centerHorizontal="true"

       android:text="CONVERT"

       android:textSize="20sp"

       android:onClick="convertToEuro"/>

   <ImageView

       android:id="@+id/image"

       android:layout_below="@+id/button"

       android:layout_width="match_parent"

       android:layout_height="wrap_content"

       android:src="@drawable/dollars"/>

   <TextView

       android:layout_below="@+id/image"

       android:layout_width="match_parent"

       android:layout_height="wrap_content"

       android:text="Developed By Martin Tumusiime"

       android:layout_centerHorizontal="true"

       android:textSize="20sp"/>

</RelativeLayout>

Relative Layout 

Relative Layout will align the currency converter widgets. Below is the code snippet of the Relative Layout that you have to add in activity_main.xml.

<RelativeLayout 
   
   
   android_layout_width="match_parent"
   android_layout_height="match_parent"
   tools_context=".MainActivity">
</RelativeLayout>

Plain Text 

Now, you have to enter TextView – “Enter Currency in Dollars,” this will convert currencies from dollars to euros.

To implement the above TextView, below code should be added to activity_main.xml:

<TextView
       android_id="@+id/textview"
       android_layout_width="match_parent"
       android_layout_height="wrap_content"
       android_text="Enter Currency in dollars"
       android_textSize="20sp"/>

Edit Text View 

With the help of the following widget, you can add a figure or currency that you want to convert. Below code snippet will help you in implementing the Edit Text Widget in activity_main.xml:

<EditText
       android_id="@+id/edtText"
       android_layout_below="@+id/textview"
       android_layout_width="match_parent"
       android_layout_height="wrap_content"
       android_inputType="number"
       android_hint="Enter dollars"/>

Button Widget 

Edit Text Widget will help you in adding Button widget with the following code snippet:

<Button
       android_id="@+id/button"
       android_layout_below="@+id/edtText"
       android_layout_width="wrap_content"
       android_layout_height="wrap_content"
       android_gravity="center"
       android_layout_centerHorizontal="true"
       android_text="CONVERT"
       android_textSize="20sp"
       android_onClick="convertToEuro"/>

Note: convertToEuro method will be used in Java code

Image View 

The application will look more attractive if you add image widgets to it. Using the following code snippet will help you enhance the user experience.

<ImageView
       android_id="@+id/image"
       android_layout_below="@+id/button"
       android_layout_width="match_parent"
       android_layout_height="wrap_content"
       android_src="@drawable/dollars"/>

Note: For adding images, you have to download the image, and copy and paste in your drawable folder (you will find it under res).

Below is the final code of activity_main.xml file that will reflect once you are done with the code:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
   
   
   android_layout_width="match_parent"
   android_layout_height="match_parent"
   tools_context=".MainActivity">
   <TextView
       android_id="@+id/textview"
       android_layout_width="match_parent"
       android_layout_height="wrap_content"
       android_text="Enter Currency in dollars"
       android_textSize="20sp"/>
   <EditText
       android_id="@+id/edtText"
       android_layout_below="@+id/textview"
       android_layout_width="match_parent"
       android_layout_height="wrap_content"
       android_inputType="number"
       android_hint="Enter dollars"/>
   <Button
       android_id="@+id/button"
       android_layout_below="@+id/edtText"
       android_layout_width="wrap_content"
       android_layout_height="wrap_content"
       android_gravity="center"
       android_layout_centerHorizontal="true"
       android_text="CONVERT"
       android_textSize="20sp"
       android_onClick="convertToEuro"/>
   <ImageView
       android_id="@+id/image"
       android_layout_below="@+id/button"
       android_layout_width="match_parent"
       android_layout_height="wrap_content"
       android_src="@drawable/dollars"/>
   <TextView
       android_layout_below="@+id/image"
       android_layout_width="match_parent"
       android_layout_height="wrap_content"
       android_text="Developed By Martin Tumusiime"
       android_layout_centerHorizontal="true"
       android_textSize="20sp"/>
</RelativeLayout>

Add Java code to MainActivity.java File 

Get back to Java > com.example.currencyconverterApp and select MainActivity

onCreate method that is already created will be the first thing you will find in the Main Activity Java File. Below is the code snippet:

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

Now is the time to implement convertToEuro method in activity_main.xml with following coding:

public void convertToEuro(View view){
   EditText editText = (EditText) findViewById(R.id.edtText);
   int dollars = Integer.parseInt(editText.getText().toString());
   int euro = 2000;
   double result = dollars * euro ;
   Toast.makeText(MainActivity.this, Double.toString(result), Toast.LENGTH_LONG).show();

MainActivity.java

You have to add the code implementation in the Java file:

public class MainActivity extends AppCompatActivity {
   public void convertToEuro(View view){
       EditText editText = (EditText) findViewById(R.id.edtText);
       int dollars = Integer.parseInt(editText.getText().toString());
       int euro = 2000;
       double result = dollars * euro ;
       Toast.makeText(MainActivity.this, Double.toString(result), Toast.LENGTH_LONG).show();
   }
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
   }
}

By performing the above procedure, you would be able to build a currency converter application on the Android platform.

Read also: A Guide On Choosing The Right Mobile App Database

How to Make Money Out of a Currency Converter Application?

Now, as you have understood the process of developing an android application, you can start earning by making one for yourself. How? Well. Below is the answer to your question.

Add this currency converter app to Apple App Store and charge a price or upload it on Google Play Store without charging even a single penny.

But then the question comes, how will you earn money on Google Play Store? Well, you can feature advertisements on your mobile and earn money, or you can opt for the freemium model. In this model, you can provide features for free, and then you can charge money for the exclusive features.

Harikrishna Kundariya

CEO, eSparkBiz

Harikrishna Kundariya, a marketer, developer, IoT, chatbot and blockchain savvy, designer, co-founder, Director of eSparkBiz @Software Development Company where you can Hire Software Developers. His 15+ experience enables him to provide digital solutions to new start-ups based on Web app development.