OTP (token) should be automatically read from the message

Question

I am working on an Android App, in which the server sends an OTP and the user needs to enter this OTP in the App, to SignUp for my App. What I want is, that my App should be able to automatically read the OTP sent by the server. How can I achieve this? Any help or guidance in this regard would be highly appreciated.

Answer 1

I will recommend you not to use any third party libraries for auto fetch OTP from SMS Inbox. This can be done easily if you have basic understanding of Broadcast Receiver and how it works. Just Try following approach :

1. Create single interface i.e SmsListner

package com.wnrcorp.reba; public interface SmsListener {     public void messageReceived(String messageText); } 

2. Create single Broadcast Receiver i.e SmsReceiver

package com.wnrcorp.reba; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.telephony.SmsMessage;  public class SmsReceiver extends BroadcastReceiver {     private static SmsListener mListener;     Boolean b;     String abcd, xyz;     @Override     public void onReceive(Context context, Intent intent) {         Bundle data = intent.getExtras();         Object[] pdus = (Object[]) data.get("pdus");         for (int i = 0; i < pdus.length; i++) {             SmsMessage smsMessage = SmsMessage.createFromPdu((byte[]) pdus[i]);             String sender = smsMessage.getDisplayOriginatingAddress();             // b=sender.endsWith("WNRCRP");  //Just to fetch otp sent from WNRCRP             String messageBody = smsMessage.getMessageBody();             abcd = messageBody.replaceAll("[^0-9]", ""); // here abcd contains otp              which is in number format             //Pass on the text to our listener.             if (b == true) {                 mListener.messageReceived(abcd); // attach value to interface                  object             } else {}         }     }     public static void bindListener(SmsListener listener) {         mListener = listener;     } } 

3. Add Listener i.e broadcast receiver in android manifest file

<receiver android:name=".SmsReceiver">     <intent-filter>         <action android:name="android.provider.Telephony.SMS_RECEIVED"/>     </intent-filter> </receiver> 

and add permission

<uses-permission android:name="android.permission.RECEIVE_SMS"/> 

4. The activity where you going to auto fetch otp when it is received in inbox. In my case I'm fetching otp and setting on edittext field.

public class OtpVerificationActivity extends AppCompatActivity {     EditText ed;     TextView tv;     String otp_generated, contactNo, id1;     GlobalData gd = new GlobalData();     @Override     protected void onCreate(Bundle savedInstanceState) {             super.onCreate(savedInstanceState);             setContentView(R.layout.activity_otp_verification);             ed = (EditText) findViewById(R.id.otp);             tv = (TextView) findViewById(R.id.verify_otp);             /*This is important because this will be called every time you receive               any sms */             SmsReceiver.bindListener(new SmsListener() {                 @Override                 public void messageReceived(String messageText) {                     ed.setText(messageText);                 }             });             tv.setOnClickListener(new View.OnClickListener() {                     @Override                     public void onClick(View v) {                         try {                             InputMethodManager imm =                                 (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);                             imm.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);                         } catch (Exception e) {}                         if (ed.getText().toString().equals(otp_generated)) {                             Toast.makeText(OtpVerificationActivity.this, "OTP Verified                                  Successfully!", Toast.LENGTH_SHORT).show();                                        }                         });                 }             } } 

Layout File for OtpVerificationActivity

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/activity_otp_verification"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:paddingBottom="@dimen/activity_vertical_margin"     android:paddingLeft="@dimen/activity_horizontal_margin"     android:paddingRight="@dimen/activity_horizontal_margin"     android:paddingTop="@dimen/activity_vertical_margin"     tools:context="com.wnrcorp.reba.OtpVerificationActivity">     <android.support.v7.widget.CardView         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:id="@+id/firstcard"         xmlns:card_view="http://schemas.android.com/apk/res-auto"         card_view:cardCornerRadius="10dp"         >         <LinearLayout             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:orientation="vertical"             android:background="@android:color/white">             <TextView                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="OTP Confirmation"                 android:textSize="18sp"                 android:textStyle="bold"                 android:id="@+id/dialogTitle"                 android:layout_margin="5dp"                 android:layout_gravity="center"                 />             <EditText                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:id="@+id/otp"                 android:layout_margin="5dp"                 android:hint="OTP Here"                 />             <TextView                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="Verify"                 android:textSize="18sp"                 android:id="@+id/verify_otp"                 android:gravity="center"                 android:padding="10dp"                 android:layout_gravity="center"                 android:visibility="visible"                 android:layout_margin="5dp"                 android:background="@color/colorPrimary"                 android:textColor="#ffffff"                 />         </LinearLayout>     </android.support.v7.widget.CardView> </RelativeLayout> 

Screenshots for OTP Verification Activity where you fetch OTP as soons as messages received

Answer 2

You can try using a simple library like

After installing via gradle and adding permissions initiate SmsVerifyCatcher in method like onCreate activity:

    smsVerifyCatcher = new SmsVerifyCatcher(this, new OnSmsCatchListener<String>() {     @Override     public void onSmsCatch(String message) {         String code = parseCode(message);//Parse verification code         etCode.setText(code);//set code in edit text         //then you can send verification code to server     } }); 

Also, override activity lifecicle methods:

  @Override protected void onStart() {     super.onStart();     smsVerifyCatcher.onStart(); }  @Override protected void onStop() {     super.onStop();     smsVerifyCatcher.onStop(); }  /**  * need for Android 6 real time permissions  */ @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {     super.onRequestPermissionsResult(requestCode, permissions, grantResults);     smsVerifyCatcher.onRequestPermissionsResult(requestCode, permissions, grantResults); }   public String parseCode(String message) {     Pattern p = Pattern.compile("\\b\\d{4}\\b");     Matcher m = p.matcher(message);     String code = "";     while (m.find()) {         code = m.group(0);     }     return code; }