How to add fingerprint scanner in android programmatically ?

Hello Guys ,

   In this tutorial we are making fingerprint authentication app in android studio. Fingerprint Authentication is used to protect the sensitive data. Nowadays, all app use these feature in their app for security purpose. It is very easy to implement fingerprint authentication. Here we implement fingerprint authentication.   Here we used TextView , ImageView and Button for create attractive layout for app.

Fingerprint Authentication App looking like below picture :

Let's get started.

Step 1 : Create a new Project.

Step 2 :  Add dependency in gradle file.

   implementation 'androidx.biometric:biometric:1.1.0'

Step 3 :  Add Permission in AndroidManifest.xml file.

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.fingerprint_auth"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/Theme.Fingerprint_Auth"> <activity android:name=".Home"></activity> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> <uses-permission android:name="android.permission.USE_BIOMETRIC" /> </manifest>

Step 4 :  Edit activity_main.xml file.

• Here we add  TextView and ImageView for creating attractive layout.

<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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:gravity="center" android:orientation="vertical" tools:context=".MainActivity"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text=" FingerPrint\nAuthentication" android:textColor="@color/black" android:textStyle="normal" android:textSize="30dp" /> <ImageView android:layout_width="100dp" android:layout_height="100dp" android:layout_marginVertical="20dp" android:src="@drawable/ic_baseline_fingerprint_24" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Use fingerprint to login" android:textColor="@color/black" android:textStyle="normal" android:textSize="18sp" /> <TextView android:id="@+id/msgtext" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="" android:textSize="18sp" /> <Button android:id="@+id/login" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginVertical="20dp" android:background="@drawable/btn_background" android:text="Login" /> </LinearLayout>

Step 5 :  Implement MainActivity.java file.

import androidx.appcompat.app.AppCompatActivity; import androidx.biometric.BiometricManager; import androidx.biometric.BiometricPrompt; import androidx.core.content.ContextCompat; import android.content.Intent; import android.graphics.Color; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; import java.util.concurrent.Executor; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); TextView msgtex = findViewById(R.id.msgtext); final Button loginButton = findViewById(R.id.login); // Create BiometricManager Variables for check user can use sensor or not. BiometricManager biometricManager = BiometricManager.from(this); switch (biometricManager.canAuthenticate()){ //we can use biometric sensor case BiometricManager.BIOMETRIC_SUCCESS: break; // Device Doesnot have any fingerprint sensor case BiometricManager.BIOMETRIC_ERROR_NO_HARDWARE: msgtex.setText("This Device Doesnot have a fingerprint sensor"); loginButton.setVisibility(View.GONE); break; // Biometric Sensor not available at that time. case BiometricManager.BIOMETRIC_ERROR_HW_UNAVAILABLE: msgtex.setText("This Device Biometric sensor is not available at that time."); loginButton.setVisibility(View.GONE); break; // this means that the device doesn't contain your fingerprint case BiometricManager.BIOMETRIC_ERROR_NONE_ENROLLED: msgtex.setText("Doesn't have fingerprint saved"); loginButton.setVisibility(View.GONE); break; } // Create Variable for executing Executor executor = ContextCompat.getMainExecutor(this); final BiometricPrompt biometricPrompt = new BiometricPrompt(MainActivity.this, executor, new BiometricPrompt.AuthenticationCallback() { @Override public void onAuthenticationError(int errorCode, CharSequence errString) { super.onAuthenticationError(errorCode, errString); } @Override public void onAuthenticationSucceeded(BiometricPrompt.AuthenticationResult result) { super.onAuthenticationSucceeded(result); startActivity(new Intent(MainActivity.this , Home.class)); } @Override public void onAuthenticationFailed() { super.onAuthenticationFailed(); } }); final BiometricPrompt.PromptInfo promptInfo = new BiometricPrompt.PromptInfo.Builder().setTitle("FingerPrint Auth") .setDescription("Use your fingerprint to login ").setNegativeButtonText("Cancel").build(); loginButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { biometricPrompt.authenticate(promptInfo); } }); } }

Output :

I hope you like post. If you liked this post do comment ,share and promote the post 🙏 . Please stay with us and support.  🙏