UI & UX

Android How to Add Fingerprint Authentication

By Sharif Khaleel November 22, 2016 0 Comments

Recently with the release of Android 6.0 (M) last year, there has been a significant amount of changes to the APIs, one of them is Fingerprint Authentication. With the release of new APIs, authenticating users with help of fingerprint sensors on various devices is possible.
Following tutorial example shows how to implement Fingerprint Authentication in your application.

To authenticate users using the fingerprint sensor, you need to get an instance of the newly implemented FingerprintManager class and call the authenticate() method. However your app must be running on a compatible device which includes a fingerprint sensor. Moreover you must implement the user interface for the fingerprint authentication flow on your app, and use the standard Android fingerprint icon in your UI. Note that If you are developing multiple apps that use fingerprint authentication, each app must authenticate the user’s fingerprint separately.

DOWNLOAD CODE DOWNLOAD .APK

VIDEO DEMO

Advantages of Using Fingerprint Authentication

1. Doesn’t matter how sick you are or unable to recollect things, your fingerprint still stays faultless as your identity and can never be misplaced.
2. Fast , Convenient and Reliable to use.
3. Unique fingerprints assure that it’s unlocked just by you.
4. With the help of Fingerprint authentication, online transactions become more convenient, hence your just a tap away from getting verified.

Here is the final app we are about to build.

android-fingerprint-authentication-sign-in

1. Creating New Project

1. Create a new project in Android Studio from File ⇒ New Project and set the minimum SDK version to Android 6.0 (API 23).

android-fingerprint-authentication-minimum-target-version

2. Since we are going to work with Fingerprint authentication, we need to add USE_FINGERPRINT permission to AndroidManifest.xml file

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="info.androidhive.fingerprint">

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

   <application
       android:allowBackup="true"
       android:icon="@mipmap/ic_launcher"
       android:label="@string/app_name"
       android:supportsRtl="true"
       android:theme="@style/AppTheme">
       <activity android:name=".FingerprintActivity">
           <intent-filter>
               <action android:name="android.intent.action.MAIN" />


               <category android:name="android.intent.category.LAUNCHER" />
           </intent-filter>
       </activity>
   </application>
</manifest>

3. Open colors.xml file located under res ⇒ values and update the file.

<?xml version="1.0" encoding="utf-8"?>
<resources>
   <color name="colorPrimary">#263237</color>
   <color name="colorPrimaryDark">#1e282d</color>
   <color name="colorAccent">#1e282d</color>
   <color name="textPrimary">#f5f5f5</color>
   <color name="textPrimaryDark">#95aab4</color>
   <color name="errorText">#ff7878</color>
</resources>

4. Open strings.xml file located under res ⇒ values and update the file.

<resources>
   <string name="app_name">Fingerprint</string>
   <string name="title_activity_main">MainActivity</string>
   <string name="title_fingerprint">One-touch Sign In</string>
   <string name="desc_fingerprint">Please place your fingertip on the scanner to verify your identity</string>
   <string name="note">(Fingerprint sign in makes your app login much faster. Your device should have at least one fingerprint registered in device settings)</string>
   <string name="title_activity_home">Fingerprint</string>
   <string name="activity_home_desc">You have successfully logged in with fingerprint authentication</string>
   <string name="activity_home_note">Close and re-open the app to see the fingerprint auth screen again</string>
</resources>

5. Create the fingerprint icon with the help of “Android Image Assets”. To do so, Right click on the drawable folder and Create a New ⇒ Image Asset named ic_action_fingerprint

2. Creating Fingerprint Activity

6. Create a layout xml file named activity_fingerprint.xml and place the below code.

<?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_fingerprint"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:background="@color/colorPrimary"
   tools:context="info.androidhive.fingerprint.FingerprintActivity">


   <LinearLayout
       android:layout_width="match_parent"
       android:id="@+id/headerLayout"
       android:orientation="vertical"
       android:gravity="center"
       android:layout_marginTop="100dp"
       android:layout_height="wrap_content">


       <ImageView
           android:layout_width="70dp"
           android:layout_height="70dp"
           android:src="@drawable/ic_action_fingerprint"
           android:id="@+id/icon"
           android:paddingTop="2dp"
           android:layout_marginBottom="30dp"/>


       <TextView
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:textColor="@color/textPrimary"
           android:textSize="24sp"
           android:text="@string/title_fingerprint"
           android:layout_marginLeft="5dp"
           android:layout_marginRight="5dp"
           android:layout_marginTop="20dp"
           android:layout_marginBottom="10dp"/>

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


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

   </LinearLayout>
   <TextView
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:textColor="@color/textPrimaryDark"
       android:textSize="14sp"
       android:text="@string/note"
       android:layout_marginLeft="16dp"
       android:textAlignment="center"
       android:layout_marginRight="16dp"
       android:layout_marginBottom="26dp"
       android:layout_alignParentBottom="true"/>

</RelativeLayout>

7. Create an Android Activity class and name it FingeprintActivity.java. The following class includes various methods and functions like, onCreate() method that inflates activity_fingerprint.xml.

> generateKey() function which generates an encryption key which is then stored securely on the device.

> cipherInit() function that initializes the cipher that will be used to create the encrypted FingerprintManager.

> CryptoObject instance and various other checks before initiating the authentication process which is implemented inside onCreate() method.

Add the following final code of Finagerprint Actvity to the FinagerprintActvity.java file.

package info.androidhive.fingerprint;

import android.Manifest;
import android.annotation.TargetApi;
import android.app.KeyguardManager;
import android.content.pm.PackageManager;
import android.hardware.fingerprint.FingerprintManager;
import android.os.Build;
import android.security.keystore.KeyGenParameterSpec;
import android.security.keystore.KeyPermanentlyInvalidatedException;
import android.security.keystore.KeyProperties;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import java.io.IOException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;


public class FingerprintActivity 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;


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


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


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


       // 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);
       }
   }
}

3. Creating Home Activity

8. Create the Activity by right-clicking your Project, New ⇒ Activity ⇒ Basic Activity and update the following files as shown below.

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:fitsSystemWindows="true"
   tools:context="info.androidhive.fingerprint.HomeActivity">


   <android.support.design.widget.AppBarLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:theme="@style/AppTheme.AppBarOverlay">


       <android.support.v7.widget.Toolbar
           android:id="@+id/toolbar"
           android:layout_width="match_parent"
           android:layout_height="?attr/actionBarSize"
           android:background="?attr/colorPrimary"
           app:popupTheme="@style/AppTheme.PopupOverlay" />


   </android.support.design.widget.AppBarLayout>

   <include layout="@layout/content_home" />

</android.support.design.widget.CoordinatorLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:id="@+id/content_home"
   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"
   app:layout_behavior="@string/appbar_scrolling_view_behavior"
   tools:context="info.androidhive.fingerprint.HomeActivity"
   tools:showIn="@layout/activity_home">


   <TextView
       android:layout_width="match_parent"
       android:text="@string/activity_home_desc"
       android:layout_centerVertical="true"
       android:textSize="24sp"
       android:textAlignment="center"
       android:textColor="@color/colorPrimary"
       android:layout_height="wrap_content" />


   <TextView
       android:layout_width="match_parent"
       android:text="@string/activity_home_note"
       android:layout_alignParentBottom="true"
       android:textSize="14sp"
       android:textAlignment="center"
       android:textColor="@color/colorPrimary"
       android:layout_height="wrap_content"
       android:layout_marginBottom="24dp"/>

</RelativeLayout>

package info.androidhive.fingerprint;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;

public class HomeActivity extends AppCompatActivity {

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_home);
       Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
       setSupportActionBar(toolbar);
   }
}

4. Creating Fingerprint Authentication Handler Class

9. Create a class and name it FingerprintHandler.java. The Handler class extends FingerprintManager.AuthenticationCallback and includes some additional modules. Replace the following set of codes with any existing codes on FingerprintHandler.java file.

package info.androidhive.fingerprint;


import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.fingerprint.FingerprintManager;
import android.os.CancellationSignal;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.widget.TextView;


/**
* Created by whit3hawks on 11/16/16.
*/
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);
   }


   public void update(String e, Boolean success){
       TextView textView = (TextView) ((Activity)context).findViewById(R.id.errorText);
       textView.setText(e);
       if(success){
           textView.setTextColor(ContextCompat.getColor(context,R.color.colorPrimaryDark));
       }
   }
}

5. Testing the Project

Testing on a Physical Device

With the project now complete, debug the app on a physical Android device by placing your fingertip on the fingerprint scanner. If Fingerprint Authentication is succeed, user will be taken to the Home Activity as shown below.

android-fingerprint-authentication-verified

Testing on an Emulator

You could also test the app on an emulator:

> Install Android SDK Tools Revision 24.3, if you have not done so.

> Enroll a new fingerprint in the emulator by going to Settings ⇒ Security ⇒ Fingerprint, then follow the enrollment instructions.

> Use an emulator to emulate fingerprint touch events with the following command. Use the same command to emulate fingerprint touch events on the lockscreen or in your app.

adb -e emu finger touch <finger_id>

On Windows, you may have to run telnet 127.0.0.1 followed by finger touch .

Sharif Khaleel

Information Technology graduate from Maldives, currently making way towards a Doctorate in Information Technology. I enjoy meeting new people and finding ways to help them have an uplifting experience. I have had a variety of experience in Web Development and Mobile Application Development.

Akkis

Thank you! Another useful tutorial 🙂 Just note that FinagerprintHandler.class code doesn’t open the HomeActivity after a successful fingerprint reading.
- Ravi Tamada
  
  Yes, it seems. I’ll update the code. Thanks for pointing that out.
  - Alok Raj Singh
    
    Hello sir plz update does “doesn’t open the HomeActivity after a successful fingerprint reading”
    and notify me alokrajsingh255@gmail.com
  - AnthonyHaddad
    
    Hello Ravi, Did you update the code? Thanks in advance
- Sharif khaleel
  
  I’ll update the code. Thank You.
  - AnthonyHaddad
    
    Hello Sharif, did u update the code? thanks in advance
Harsh

Hey Ravi, thanks for sharing this tutorial. I have one doubt related to
Service. that is when my app closes my background service runs but when i
removed it from my task manager then the background Service also
Stops.So if i want to start that service then what i do for that.
Because my push notification are also not receives with this kind of
issue, Please Kindly help. 🙂
- Ravi Tamada
  
  Why are you removing the app from Task Manager?
  - Harsh
    
    Thanks for the reply Ravi..i am using Redmi 3s prime phone and for cleaning the RAM i am removing app from task manager. I am also removing whatsapp and facebook app from my task manager, but after that i get message from both whatsapp and facebook , but not from my app, So how whatsapp and facebook start their service even after i removed it from task manager?
    Please help ravi, its burning issue for me, and it will help other developers too…
    - Ravi Tamada
      
      What is service you are using to receive the message. Push notification?
      - Harsh
        
        GCMBaseIntentService
      - Ravi Tamada
        
        I guess GCM service won’t be killed as it runs as google service. Have a look at below links
        http://stackoverflow.com/questions/31981275/why-gmail-yahoo-whats-app-service-is-not-getting-killed
        
        http://stackoverflow.com/questions/10671460/restart-the-service-even-if-app-is-force-stopped-and-keep-running-service-in-bac
        
        Also try using Firebase instead of GCM.
      - Harsh
        
        If GCM service won’t be killed then i would get the push notifications, but i would not. if i not removed my app from task manager then, i am getting push notifications, but when i remove my app then push notification does not arrives.
      - Ravi Tamada
        
        I have see why this is happening?
      - Harsh
        
        That is also big mystery for me. Please see if you could help.
      - Mayank Sharma
        
        in Redmi Phones ( Based on MIUI) You Have to Give Permission for Auto start the app So You can get Push notifications when App is clear from memory
        
        so for that Go to Security > Permission > AutoStart and select your app and turn On auto start for that and after that you will be able to receive Push.
        
        Note : MIUI have default auto start on for Facebook , Whats app etc as they are popular apps so MIUI takes care of that so basically concept is that if any app have auto start permission by MIUI then its able to receive push when its not in stack
        if you turn off auto start for Facebook , Whatsapp then they will also not able to receive push
      - Dheeraj Kumar
        
        hi sir i want ask one question that’s how to sensor used associated with api for give information using fingerprint like a Adhar card etc…
        and what should need of resourses …..such as device etc…
        Please see if you could help.
      - Dheeraj Kumar
        
        hi sir i want ask one question that’s how to sensor used associated with api for give information using fingerprint like a Adhar card etc…
        and what should need of resourses …..such as device etc…
        Please see if you could help.
Renitto Jose

Thank you Ravi for the tutorial. The tutorial got some typo errors . BTW are you using any patterns for the development, like MVP, MVVM or any other if so please provide a simple tutorial on that.
- Ravi Tamada
  
  Hi Renitto
  
  Could you point out the typo errors. I’ll correct them. I am not using any MVP or other models as of now.
  - Renitto Jose
    
    FingerprintActivity / FinagerprintActvity.java
  - Arbaaz
    
    There is one more typo error at step 7 (Fingeprint)
- Sharif khaleel
  
  Hi Renitto,
  
  Could you please highlight those errors 🙂
Bhavesh Sharma

Sir, Can you please suggest me some latest android books (2016) covering latest technologies ?
Manoj Kumar

Thank you Ravi for the tutorial. I had One doubt, That is what kind of data we can get after authentication (“onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result)”)
and we will store the result in to database. How We can Use it For Real time Applications For authentication. does it will generate a unique id for each user..
- Sharif khaleel
  
  Android system doesn’t allow users to save fingerprints remotely. Fingerprints are stored in a secure place by android and are not accessible.
  
  “Thus, raw images and processed fingerprint features must not be passed in untrusted memory. All such biometric data needs to be secured within sensor hardware or trusted memory. (Memory inside the TEE is considered as trusted memory; memory outside the TEE is considered untrusted.)” – Android
Rami Ali

Thanks Ravi for the tutorial,, but when i tried to add Fingerprint in a Service , i got an error

is there anyway to add fingerprint auth in Service ?
- Ravi Tamada
  
  What’s the error?
  - Rami Ali
    
    i am getting a toast message saying ” Fingerprint Authentication error fingerprint operation canceled”
Jean-dev

hello i wanna be to save the finger touch in sqlite database
- Sharif khaleel
  
  Android doesn’t allow users to save fingerprints remotely. Fingerprints are stored in a secure place by android and are not accessible.
  
  “Thus, raw images and processed fingerprint features must not be passed in untrusted memory. All such biometric data needs to be secured within sensor hardware or trusted memory. (Memory inside the TEE is considered as trusted memory; memory outside the TEE is considered untrusted.)” – Android
Aniket Indulkar

nice
Vaibhav

how to get scanned fingerprint name after Authentication Succeeded ??
Mansukh Gagal

@ravi8x:disqus Is Fingerprint provide any unique code for specific scanned fingerprint or Fingerprint name which is show on settings->secure->fingerprint ?
Pavitra Golchha

The app that you shared is not opening.

It says “Unfortunately, Fingerprint has stopped.”

I’m using Coolpad Note 3 Lite, running Android 6.0 with a fingerprint sensor.
Pascal Okyere Adomako

Thanks @ravi8x:disqus for this tutorial. I have been able to successfully implement it. I just wanna know, is there anyway i can get the scanned fingerprint result and save elsewhere?
Also, at certain times, my sensor seems to be blocked (not onAuthenticationError) until a few tries. This always happens just when i use the app i built from this tutorial. I am using a Oneplus 3
- Sharif khaleel
  
  Android doesn’t allow users to save fingerprints remotely. Fingerprints are stored in a secure place by android and are not accessible.
  
  “Thus, raw images and processed fingerprint features must not be passed in untrusted memory. All such biometric data needs to be secured within sensor hardware or trusted memory. (Memory inside the TEE is considered as trusted memory; memory outside the TEE is considered untrusted.)” – by Android
  - Bladimir Barajas
    
    How do you make an app to register a user using fingerprint auth, and be able to BAN the user by this same method? I would love to have the option to BAN users Permanently by fingerprint auth. Is this possible or do you know a workaround that can achieve this?
    
    Thanks!
    - Sharif khaleel
      
      There are no workaround, at least nothing that I know. Also you should’t try to sync fingerprint data to cloud.
N Veera

how to list all fingerprints name?
- AnthonyHaddad
  
  did u get it to redirect to the homeActivity page?
  - Kamran Azam
    
    After :
    @Override
    public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
    this.update(“Fingerprint Authentication succeeded.”, true);
    
    //add this code:
    Intent i = new Intent(context, HomeActivity.class); //Replace HomeActivity with the name of your activity
    context.startActivity(i);
    
    //Hope this help
    }
Ash Ashu

@ravi8x:disqus can I add fingerprint data in sql or firebase datatbase and can I use tht data for authentications .eg. I need to verify the fingerprints from adhar card and the data I am giving ..
please rply soon ..
- Sharif khaleel
  
  Syncing fingerprint data to cloud is not supported by Android.
  
  “Thus, raw images and processed fingerprint features must not be passed in untrusted memory. All such biometric data needs to be secured within sensor hardware or trusted memory. (Memory inside the TEE is considered as trusted memory; memory outside the TEE is considered untrusted.)” – by Android
  - Ravi Tamada
    
    Thanks Sharif.
Fenil Shah

Hello guys,

Thank you for great tutorial. I have a quick question if you guys don’t mind answering. How do i restrict fingerprint authentication to be used on single activity. currently i is running on every single activity of my app.

Thanks.
Mayank Langalia

Hello My phone is not support finger print.
Is there any other alternative. ? how to achieve this authentication without sensor ?
Viral Patel

Thank you very much for wonderful tutorial. I want to use php mysql login authentication with fingerprint reader with android app please help to implement this.
Frenki Tahir

How to display the finger scan results based on the id, the example displays the results of a different finger scan, so each finger d scan and display the scan results
Kennedy

Hey Ravi, this doesn’t work on Samsung galaxy s5, after the app launches,it says my device doesnt have a finger print sensor, any ideas?
- Kritika Gopala Krishnan
  
  samsung has ts own fingerpnt API calld Pass. Android’s API doesn’t work.
Akshay Panchal

Are you using it with the external fingerprint device for it…?@RaviTamda
Er Umang Kejriwal

how can i use external bio-metric device for fingerprint?
Iron Man

What is use of gerateKey, cipherObject etc? and which Samsung devices do not support Android’s Fingerprint API?

Advantages of Using Fingerprint Authentication

1. Creating New Project

2. Creating Fingerprint Activity

3. Creating Home Activity

4. Creating Fingerprint Authentication Handler Class

5. Testing the Project

Testing on a Physical Device

Testing on an Emulator

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