OTP View in Android Studio

OTP (One-Time Password) is a powerful mechanism for securing applications with an additional layer of authentication. OTP view is an essential component of an authentication screen. In this article, we'll discuss how to implement OTP view in Android Studio.

What is OTP View?

OTP View is a UI component that allows users to input OTP code for authentication purposes. Typically, OTP View consists of a set of input boxes where users can enter a code sent to them via SMS or email.

How to Implement OTP View in Android Studio

To implement OTP View in Android Studio, we can use the EditText class to create multiple input boxes and set a text change listener to switch focus to the next box when the user completes typing in the current box.

Here's some sample code:

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

   <EditText
       android:id="@+id/otp_box_1"
       android:layout_width="40dp"
       android:layout_height="40dp"
       android:inputType="number"
       android:maxLines="1"
       android:textSize="20dp" />

   <EditText
       android:id="@+id/otp_box_2"
       android:layout_width="40dp"
       android:layout_height="40dp"
       android:inputType="number"
       android:maxLines="1"
       android:textSize="20dp" />

   <EditText
       android:id="@+id/otp_box_3"
       android:layout_width="40dp"
       android:layout_height="40dp"
       android:inputType="number"
       android:maxLines="1"
       android:textSize="20dp" />

   <EditText
       android:id="@+id/otp_box_4"
       android:layout_width="40dp"
       android:layout_height="40dp"
       android:inputType="number"
       android:maxLines="1"
       android:textSize="20dp" />

</LinearLayout>

In the above code, we've created four EditText boxes with unique IDs. We've set the input type to "number" and the maximum lines to 1. We've also set the width and height to 40dp and the text size to 20dp.

Next, we can add a text change listener to each EditText box to switch focus to the next box when the user completes typing in the current box. Here's some sample code:

EditText otpBox1 = findViewById(R.id.otp_box_1);
otpBox1.addTextChangedListener(new OTPTextWatcher(otpBox1, otpBox2));

EditText otpBox2 = findViewById(R.id.otp_box_2);
otpBox2.addTextChangedListener(new OTPTextWatcher(otpBox2, otpBox3));

EditText otpBox3 = findViewById(R.id.otp_box_3);
otpBox3.addTextChangedListener(new OTPTextWatcher(otpBox3, otpBox4));

EditText otpBox4 = findViewById(R.id.otp_box_4);
otpBox4.addTextChangedListener(new OTPTextWatcher(otpBox4, null));

In the above code, we've created four EditText objects with the corresponding IDs. Next, we've added a TextWatcher to each EditText box to listen for text changes. The OTPTextWatcher class implements the TextWatcher interface and switches focus to the next EditText box when the user completes typing in the current box.

Conclusion

In conclusion, implementing OTP View is a straightforward process that can add an additional layer of security to an application. By using the EditText class to create multiple input boxes and setting up a text change listener to switch focus to the next box, we can create a simple and user-friendly OTP View in Android Studio.