Table of Contents

    Introduction:

    Are you using the latest version of android? Yes, Then use Android’s latest feature Fingerprint authentication. Only you have the authorization to access your own phone and app. After the release of Android 6.0 Marshmallow android released fingerprint-secured authentication, Which allows you to secure your app and phone. It’s also called as biometric authentication.

    It’s a very Fast and Dependable way of authenticating a user’s identity

    - Nowadays all the payment apps are using fingerprint access to allow you send payment and receive payments.
    - It’s very secured so it can not allow any other person’s fingerprint identity to access your phone and payment app.
    - To implement this functionality in your app if you do not have Marshmallow version 6.0 then you have to download from Android SDK.
    - It will not accessible in non-fingerprint support smartphones.

     

    Steps to enable fingerprint in your smartphone.

    - Your device should have fingerprint scanner which can authenticate your thumb or finger.
    - Device should be compatible with android Marshmallow version 6.0.
    - You have to set your device lock screen as password, pin or pattern and you have to add at least single fingerprint.

    Steps for implementation via programming.

    1. Create a new project in Android Studio from File ⇒ New Project and set the minimum SDK version to Android 6.0 (API 23).
    2. Without permission it won’t allow you to start your app so first of all you have to add permission in AndroidManifest.xml file. (Help contact Android App Development Team) 

    - App also need to add permission to add feature of touch sensor in order to access finger touch.

    - App will check that your device has registered fingerprint or not if not then it will give message that please add at least one fingerprint in your smartphone.
    XML coding for frontend UI.
    activity_main.xml

    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_fingerprint"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#252b30"
    android:orientation="vertical">

    <ImageView
    android:id="@+id/icon"
    android:layout_width="60dp"
    android:layout_height="60dp"
    android:layout_gravity="center"
    android:layout_marginBottom="30dp"
    android:layout_marginTop="100dp"
    android:paddingTop="2dp"
    android:src="@drawable/ic_action_fingerprint" />

    <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:layout_marginBottom="10dp"
    android:layout_marginLeft="5dp"
    android:layout_marginRight="5dp"
    android:layout_marginTop="20dp"
    android:text="@string/title_fingerprint"
    android:textColor="@android:color/white"
    android:textSize="20sp" />

    <TextView
    android:id="@+id/desc"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:layout_margin="16dp"
    android:gravity="center"
    android:paddingEnd="30dp"
    android:paddingStart="30dp"
    android:text="@string/desc_fingerprint"
    android:textAlignment="center"
    android:textColor="@android:color/white"
    android:textSize="16sp" />

    <TextView
    android:id="@+id/errorText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="30dp"
    android:gravity="center"
    android:paddingEnd="30dp"
    android:paddingStart="30dp"
    android:textAlignment="center"
    android:textColor="@android:color/white"
    android:textSize="14sp" />


    Create fingerprint authentication part.

    You have to check that your device has software,hardware settings to access fingerprint authentication.

    Initialize both Android KeyguardManager and FingerprintManager.

    KeyguardManager keyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);
    FingerprintManager fingerprintManager = (FingerprintManager) getSystemService(FINGERPRINT_SERVICE);

    If your device support both this conditions than you are now accessible to use fingerprint authentication.

    To perform this authentication we have to create key,cipher and cryptoobject.

    Below code will give you access to gain keystore instance which allows you to store cryptographic keys.

    - Initialize empty keystore
    - Initialize keyGenerator
    try {
    keyStore = KeyStore.getInstance("AndroidKeyStore");
    } catch (Exception e) {
    e.printStackTrace();
    }

    KeyGenerator keyGenerator;
    try {
    keyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES, "AndroidKeyStore");
    } catch (NoSuchAlgorithmException | NoSuchProviderException e) {
    throw new RuntimeException("Failed to get KeyGenerator instance", e);
    }

    try {
    keyStore.load(null);
    keyGenerator.init(new
    KeyGenParameterSpec.Builder(KEY_NAME,
    KeyProperties.PURPOSE_ENCRYPT |
    KeyProperties.PURPOSE_DECRYPT)
    .setBlockModes(KeyProperties.BLOCK_MODE_CBC)
    .setUserAuthenticationRequired(true)
    .setEncryptionPaddings(
    KeyProperties.ENCRYPTION_PADDING_PKCS7)
    .build());
    keyGenerator.generateKey();
    } catch (NoSuchAlgorithmException |
    InvalidAlgorithmParameterException
    | CertificateException | IOException e) {
    throw new RuntimeException(e);
    }

     

    cryptoObject = new FingerprintManager.CryptoObject(cipher);
    Helper helper = new FingerprintHandler(this);
    helper.startAuth(fingerprintManager, cryptoObject);

    Create FingerPrintHandler class to access FingerprintManager Authentication
    - onAuthenticationFailed() it will called when your authentication is incorrect or not match.
    - onAuthenticationError(int errMsgId, CharSequence errString) it will called if there is any kind of fatal error.
    - onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) it will called when your fingerprint is correct or successfully authorized.
    - onAuthenticationHelp(int helpMsgId, CharSequence helpString) This method can give additional information regarding fingerprint authentication.

    FingerprintHandler.java file
    public class FingerprintHandler extends FingerprintManager.AuthenticationCallback {

    private Context context;
    // Constructor
    public FingerprintHandler(Context mContext) {
    context = mContext;
    }

    public void startAuth(FingerprintManager manager, FingerprintManager.CryptoObject cryptoObject) {
    CancellationSignal cancellationSignal = new CancellationSignal();
    if (ActivityCompat.checkSelfPermission(context, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {
    return;
    }
    manager.authenticate(cryptoObject, cancellationSignal, 0, this, null);
    }


    @Override
    public void onAuthenticationError(int errMsgId, CharSequence errString) {
    this.update("Fingerprint Authentication error\n" + errString, false);
    }


    @Override
    public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
    this.update("Fingerprint Authentication help\n" + helpString, false);
    }


    @Override
    public void onAuthenticationFailed() {
    this.update("Fingerprint Authentication failed.", false);
    }

    @Override
    public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
    this.update("Fingerprint Authentication succeeded.", true);
    ((Activity) context).finish();
    Intent intent = new Intent(context, HomeActivity.class);
    context.startActivity(intent);
    }

    public void update(String e, Boolean success){
    TextView textView = ((Activity)context).findViewById(R.id.errorText);
    textView.setText(e);
    ImageView icon = ((Activity)context).findViewById(R.id.icon);
    if(success){
    icon.setImageDrawable(ContextCompat.getDrawable(context,R.drawable.ic_action_fingerprint_success));
    textView.setTextColor(ContextCompat.getColor(context,R.color.colorAccess));
    }else {
    icon.setImageDrawable(ContextCompat.getDrawable(context,R.drawable.ic_action_fingerprint_error));
    textView.setTextColor(ContextCompat.getColor(context,R.color.colorError));
    }
    }
    }


    MainActivity.java file
    public class MainActivity extends AppCompatActivity {

    private KeyStore keyStore;
    // Variable used for storing the key in the Android Keystore container
    private static final String KEY_NAME = "androidHive";
    private Cipher cipher;
    private TextView textView;
    private ImageView icon;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // Initializing both Android Keyguard Manager and Fingerprint Manager
    KeyguardManager keyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);
    FingerprintManager fingerprintManager = (FingerprintManager) getSystemService(FINGERPRINT_SERVICE);

    textView = findViewById(R.id.errorText);
    icon = findViewById(R.id.icon);

    // Check whether the device has a Fingerprint sensor.
    if(!fingerprintManager.isHardwareDetected()){
    /**
    * An error message will be displayed if the device does not contain the fingerprint hardware.
    * However if you plan to implement a default authentication method,
    * you can redirect the user to a default authentication activity from here.
    * Example:
    * Intent intent = new Intent(this, DefaultAuthenticationActivity.class);
    * startActivity(intent);
    */
    textView.setText("Your Device does not have a Fingerprint Sensor");
    }else {
    // Checks whether fingerprint permission is set on manifest
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {
    textView.setText("Fingerprint authentication permission not enabled");
    }else{
    // Check whether at least one fingerprint is registered
    if (!fingerprintManager.hasEnrolledFingerprints()) {
    textView.setText("Register at least one fingerprint in Settings");
    }else{
    // Checks whether lock screen security is enabled or not
    if (!keyguardManager.isKeyguardSecure()) {
    textView.setText("Lock screen security not enabled in Settings");
    }else{
    generateKey();

    if (cipherInit()) {
    FingerprintManager.CryptoObject cryptoObject = new FingerprintManager.CryptoObject(cipher);
    FingerprintHandler helper = new FingerprintHandler(this);
    helper.startAuth(fingerprintManager, cryptoObject);
    }
    }
    }
    }
    }
    }

    @TargetApi(Build.VERSION_CODES.M)
    protected void generateKey() {
    try {
    keyStore = KeyStore.getInstance("AndroidKeyStore");
    } catch (Exception e) {
    e.printStackTrace();
    }

    KeyGenerator keyGenerator;
    try {
    keyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES, "AndroidKeyStore");
    } catch (NoSuchAlgorithmException | NoSuchProviderException e) {
    throw new RuntimeException("Failed to get KeyGenerator instance", e);
    }

    try {
    keyStore.load(null);
    keyGenerator.init(new
    KeyGenParameterSpec.Builder(KEY_NAME,
    KeyProperties.PURPOSE_ENCRYPT |
    KeyProperties.PURPOSE_DECRYPT)
    .setBlockModes(KeyProperties.BLOCK_MODE_CBC)
    .setUserAuthenticationRequired(true)
    .setEncryptionPaddings(
    KeyProperties.ENCRYPTION_PADDING_PKCS7)
    .build());
    keyGenerator.generateKey();
    } catch (NoSuchAlgorithmException |
    InvalidAlgorithmParameterException
    | CertificateException | IOException e) {
    throw new RuntimeException(e);
    }
    }

    @TargetApi(Build.VERSION_CODES.M)
    public boolean cipherInit() {
    try {
    cipher = Cipher.getInstance(KeyProperties.KEY_ALGORITHM_AES + "/" + KeyProperties.BLOCK_MODE_CBC + "/" + KeyProperties.ENCRYPTION_PADDING_PKCS7);
    } catch (NoSuchAlgorithmException | NoSuchPaddingException e) {
    throw new RuntimeException("Failed to get Cipher", e);
    }

    try {
    keyStore.load(null);
    SecretKey key = (SecretKey) keyStore.getKey(KEY_NAME,
    null);
    cipher.init(Cipher.ENCRYPT_MODE, key);
    return true;
    } catch (KeyPermanentlyInvalidatedException e) {
    return false;
    } catch (KeyStoreException | CertificateException | UnrecoverableKeyException | IOException | NoSuchAlgorithmException | InvalidKeyException e) {
    throw new RuntimeException("Failed to init Cipher", e);
    }
    }
    }

    How to run app in your device and emulator

    - To test the app, it is possible to use a real device that has a touch sensor. Anyway, it is possible to test the app in the emulator too.
    - To use this app in Android emulator you have to configure it
    - Your device should be compatible of Marshmallow 6.0 version.
    - If your device do not have registered of fingerprint it will show you message as per first screen
    - If your fingerprint does not match it will show your incorrect fingerprint message

    About Author

    Manektech Team

    ManekTech Team

    ManekTech is a well-known software development and IT consulting company, providing custom software, website, and mobile app development services. ManekTech has own content writing and development team who writes content on various and trending technology that it serves currently.

    Subscribe to Our Newsletter!

    Join us to stay updated with our latest blog updates, marketing tips, service tips, trends, news and announcements!

    Areas we serve

    USA

    4100 NW Loop 410, Suite 200, San Antonio, Texas, USA 78229

    UK

    7 Artisan Place Harrow, HA3 5DS

    India

    4th Floor, Timber Point, Prahaladnagar Road, Ahmedabad, Gujarat - 380015

    Germany

    Franz-Joseph-Strasse, 11,Munich, 80801, Germany

    PREV
    NEXT