BiometricPrompt

BiometricPrompt dependency:

developer.android.com/jetpack/androidx/releases/biometric

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".MainActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="openActivity2"
        android:text="Open Activity2"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

package com.codinginflow.biometricpromptexample

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.Toast
import androidx.biometric.BiometricManager
import androidx.biometric.BiometricPrompt
import androidx.core.content.ContextCompat

class MainActivity : AppCompatActivity() {
    private lateinit var biometricPrompt: BiometricPrompt

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        biometricPrompt = createBiometricPrompt()

        //BiometricManager.from(this).canAuthenticate()

        //biometricPrompt.cancelAuthentication()
    }

    private fun createBiometricPrompt(): BiometricPrompt {
        val executor = ContextCompat.getMainExecutor(this)

        val callback = object : BiometricPrompt.AuthenticationCallback() {
            override fun onAuthenticationError(errorCode: Int, errString: CharSequence) {
                Toast.makeText(
                    this@MainActivity,
                    "onAuthenticationError\nerrorCode: $errorCode\nerrString: $errString",
                    Toast.LENGTH_LONG
                ).show()
            }

            override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
                val intent = Intent(this@MainActivity, Activity2::class.java)
                startActivity(intent)
            }

            override fun onAuthenticationFailed() {
                Toast.makeText(this@MainActivity, "onAuthenticationFailed",
                    Toast.LENGTH_SHORT).show()
            }
        }

        return BiometricPrompt(this, executor, callback)
    }

    private fun createPromptInfo(): BiometricPrompt.PromptInfo {
        val promptInfo = BiometricPrompt.PromptInfo.Builder()
            .setTitle("Title")
            .setSubtitle("Subtitle")
            .setDescription("Description")
            //.setNegativeButtonText("Cancel")
            .setDeviceCredentialAllowed(true)
            //.setConfirmationRequired(false)
            .build()

        return promptInfo
    }

    fun openActivity2(view: View) {
        val promptInfo = createPromptInfo()
        biometricPrompt.authenticate(promptInfo)
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".Activity2">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Activity2"
        android:textAppearance="@style/TextAppearance.AppCompat.Large"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

package com.codinginflow.biometricpromptexample

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle

class Activity2 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_2)
    }
}