SMS OTP Fetcher library for android

    //sms verification
    implementation 'com.github.stfalcon:smsverifycatcher:0.3.2'

Requires permission for receiving and reading sms.

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

declare smsVerifyCatcher

private SmsVerifyCatcher smsVerifyCatcher;

onCreate() initialise smsVerifyCatcher

        //setup sms verify for otp
        smsVerifyCatcher = new SmsVerifyCatcher(this, new OnSmsCatchListener<String>() {
            @Override
            public void onSmsCatch(String message) {
                String code = parseCode(message);//set code in edit text
                if(!code.equals("")){
                    //TODO:- handle received code
                }
                //then you can send verification code to server
            }
        });

Codes for parsing verification code, starting and stopping catcher and for android runtime permissions. Place it after onCretae() method

    /**
     * Parse verification code
     *
     * @param message sms message
     * @return only four numbers from massage string
     */
    private 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;
    }

    @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);
    }

Hacks for using directly from fragments

• Declare smscatcher in activity
• find view in fragment, acces by typecasting activity
• start catcher in fragment start.
• use permissions directly in activity

    @Override
    public void onStart() {
        super.onStart();
        ((ActivityName)listener).smsVerifyCatcher.onStart();
    }

In fragment onCreateView

        //setup sms verify for otp
        ((LoginActivity)listener).smsVerifyCatcher = new SmsVerifyCatcher(getActivity(), new OnSmsCatchListener<String>() {
            @Override
            public void onSmsCatch(String message) {
                String code = ((ActivityName)listener).parseCode(message);
                otpView.setOTP(code);
                if(!code.equals("")){
                    verifyOTP(otpView.getOTP(),textviewEmail.getText().toString());

                }

                //then you can send verification code to server
            }
        });

In activity place codes after onCreate Method

declare catcher in activity

 //for sms verification
    public SmsVerifyCatcher smsVerifyCatcher;

parseString can be placed either in activity or in fragment

    /**
     * Parse verification code
     *
     * @param message sms message
     * @return only four numbers from massage string
     */
    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;
    }

    /**
     * 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);
    }

You can set phone number filter:

smsVerifyCatcher.setPhoneNumberFilter("777");

or set message filter via regexp:

smsVerifyCatcher.setFilter("<regexp>");