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import android.content.BroadcastReceiver;
        import android.content.Context;
        import android.content.Intent;
        import android.os.Bundle;
        import android.support.v4.content.LocalBroadcastManager;
        import android.telephony.SmsManager;
        import android.telephony.SmsMessage;
        import android.util.Log;

        import java.util.regex.Matcher;
        import java.util.regex.Pattern;

public class SmsReceiver extends BroadcastReceiver {

    private static SmsListener mListener;
    Boolean b;
    String abcd,xyz;

    private static String  TAG = "";

    @Override
    public void onReceive(Context context, Intent intent) {

        Bundle bundle = intent.getExtras();
        SmsMessage[] smsm = null;
        String sms_str ="";

        if (bundle != null)
        {
            // Get the SMS message
            Object[] pdus = (Object[]) bundle.get("pdus");
            smsm = new SmsMessage[pdus.length];

            for (int i=0; i<smsm.length; i++){
                smsm[i] = SmsMessage.createFromPdu((byte[])pdus[i]);
                sms_str += smsm[i].getMessageBody().toString();

                String Sender = smsm[i].getOriginatingAddress();
                //Check here sender is yours
                Intent smsIntent = new Intent("otp");

                String pattern = String.valueOf(Pattern.compile( "(\\d{4})"));
                Log.d(TAG, "onReceive: "+pattern);
                // Create a Pattern object
                Pattern filter = Pattern.compile(pattern);

                // Now create matcher object.
                Matcher m = filter.matcher(sms_str);
                Log.d(TAG, "onReceive: filtered " + m);
                smsIntent.putExtra("message",sms_str);
                Log.d(TAG, "onReceive: " + sms_str);
                LocalBroadcastManager.getInstance(context).sendBroadcast(smsIntent);
            }
        }
    }

// methd for communication sending sms to actvity
    public static void bindListener(SmsListener listener) {
        mListener = listener;
    }

}

 private BroadcastReceiver receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent.getAction().equalsIgnoreCase("otp")) {
                final String message = intent.getStringExtra("message");
//                editTextOtp.setText(message);
//                firstDigitOtpEdt.setText(message);
                myString = message;

                String[] digitsArray = myString.split("");
                firstDigitOtpEdt.setText(digitsArray[1]);
                secondDigitOtpEdt.setText(digitsArray[2]);
                thirdDigitOtpEdt.setText(digitsArray[3]);
                fourthDigitOtpEdt.setText(digitsArray[4]);
                //Do whatever you want with the code here
            }
        }
    };
    
      @Override
    public void onResume() {
        LocalBroadcastManager.getInstance(this).registerReceiver(receiver, new IntentFilter("otp"));
        super.onResume();
    }

    @Override
    public void onPause() {
        super.onPause();
        LocalBroadcastManager.getInstance(this).unregisterReceiver(receiver);
    }
    
    onCreate(Bundle s) {
      checkPermissions();
    }
    
    private void checkPermissions() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if ((ContextCompat.checkSelfPermission(this, Manifest.permission.READ_SMS) == PackageManager.PERMISSION_GRANTED)
                    && (ContextCompat.checkSelfPermission(this, Manifest.permission.RECEIVE_SMS) == PackageManager.PERMISSION_GRANTED)) {
                receiveOtp();
            } else {
                ActivityCompat.requestPermissions(this, permissions, PERMISSION_REQUEST);
            }
        } else {
            receiveOtp();
        }
    }
    
    // recving otp from broadcast reciver
     private void receiveOtp() {
        SmsReceiver.bindListener(new SmsListener() {
            @Override
            public void messageReceived(String messageText) {
                myString = messageText;
            }
        });
    }
    
    //result of runtime permission 
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == PERMISSION_REQUEST) {
            if (grantResults.length <= 0 || grantResults[0] != PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(this, "Please Enable sms read and recieve permissions for auto OTP", Toast.LENGTH_LONG).show();
            } else {
                receiveOtp();
            }
        }
    }

public interface SmsListener {
    public void messageReceived(String messageText);
}

// interface for communicating otp

 <LinearLayout
        android:id="@+id/otpView"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:gravity="center_horizontal"
        android:orientation="horizontal"
        app:layout_constraintBottom_toTopOf="@+id/linearLayout"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView2">

        <EditText
            android:id="@+id/et1"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:inputType="number"
            android:maxLength="1"
            android:textAlignment="center"
            android:theme="@style/Theme.App.Base" />

        <android.support.v4.widget.Space
            android:layout_width="2dp"
            android:layout_height="0dp" />

        <EditText
            android:id="@+id/et2"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:inputType="number"
            android:maxLength="1"
            android:textAlignment="center"
            android:theme="@style/Theme.App.Base" />

        <android.support.v4.widget.Space
            android:layout_width="2dp"
            android:layout_height="0dp" />

        <EditText
            android:id="@+id/et3"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:inputType="number"
            android:maxLength="1"
            android:textAlignment="center"
            android:theme="@style/Theme.App.Base" />

        <android.support.v4.widget.Space
            android:layout_width="2dp"
            android:layout_height="0dp" />

        <EditText
            android:id="@+id/et4"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:inputType="number"
            android:maxLength="1"
            android:textAlignment="center"
            android:theme="@style/Theme.App.Base" />

        <android.support.v4.widget.Space
            android:layout_width="2dp"
            android:layout_height="0dp" />


    </LinearLayout>