How To Develop Currency Converter App

In-Depth Guide To Develop Currency Converter App

By Harikrishna Kundariya Mobile April 2, 2020 12 min read 198 Views

You must have heard about the heavy economic terms – Globalization, Privatisation, and Liberation. Well, these terms have their meaning, which requires a deep study. But, we will discuss Globalization, which means operating business, trade, or transactions that take place between the two countries.

These include currency exchanges, which increase the foreign currency reserve in the country. The more foreign currency reserves, the more powerful the country is. But, the currency rates keep on fluctuating now and then, which becomes an arduous task for the businessman to keep an eye on it.

To overcome this challenge, you can develop a currency converter app. The application will help you in monitoring real-time currency exchange rates, which will give precise and accurate results. Talking about the mobile application cost, then you must go through the article on how much does it cost to make a mobile application.

The nitty-gritty of the construction of the application is included in the article, which will help you understand the do’s & don’ts and also several factors to consider while planning to build an app.

Now, the question comes on: How to develop a currency converter app? Well, this can be answered by going through following steps but before that, let’s have a look at the amazing features of Currency converter application:

  • Provide Real-Time Exchange Rates
  • Currency Analytics
  • Price Tracking Feature
  • More Number of Currencies

The application can also be built from a business perspective. If you are planning to develop an app that explains the considerable steps, then the below information would be helpful to you.

1. Identify the Market Requirement For Currency Converter App

There should be proper market research done before planning to develop a currency converter app. It is because you have to know 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. It will not hassle them, and can easily move around. Besides, the competitor’s activity should be tracked as to what rates they are offering to sustain in the market.

2. 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 which engage the users to it.

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 be focusing 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 to add which and how many currencies to add. 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 its domestic or international currency and if the app won’t be able to 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 which stores the last live data when the app was connected with the internet.

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

The currency converter application will contain more than 100s of currencies and to find and convert them to domestic 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 reduce the time of the users. Now, users can quickly access their desired currency and get the result. Also, you can add graphical representation features which will allure the user and bring new users to the application.

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3. 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, and 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 technically you can build one:

4. 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.

Procedure of Developing Currency Converter Applicatio

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.

4.Developing Currency Converter Application

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 by 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 in the Text menu.

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

<RelativeLayout 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"

   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 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"
   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 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"
   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: Mobile App Growth Statistics In 2020

5. 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 for 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 will get basic features for free, and then you have to pay money for the exclusive features.

Wrap Up

Develop a currency converter application for your users or make money out of it. There are many applications in the market like XE currency, CalConvert, My Currency Converter and many more that are delivering effective results.

If you have an idea and want to unveil the features of a currency converter application, then connect with the leading mobile app development company that has rich resources and skilled manpower.

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How To Develop Currency Converter App

Disclaimer: We at eSparkBiz Technologies have created this blog with all the consideration and utmost care. We always strive for excellence in each of our blog posts and for that purpose, we ensure that all the information written in the blog is complete, correct, comprehensible, accurate and up-to-date. However, we can’t always guarantee that the information written in the blog correct, accurate or up-to-date. Therefore, we always advise our valuable readers not to take any kind of decisions based on the information as well as the views shared by our authors. The readers should always conduct an in-depth research before making the final decision. In addition to these, all the logos, 3rd part trademarks and screenshots of websites & mobile apps are the property of the individual owners. We’re not associated with any of them.

Harikrishna Kundariya

Harikrishna Kundariya

Harikrishna Kundariya, a marketer, developer, app lover, technology savvy, designer, co-founder, Director of eSparkBiz @Mobile App Development Company where you can Hire Mobile App Developer. His 8+ experience enables him to provide digital solutions to new start-ups based on app development.

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