Option to disable fingerprint authentication

app/src/main/java/org/koitharu/kotatsu/core/prefs/AppSettings.kt

@@ -125,6 +125,10 @@ class AppSettings(context: Context) {
 		get() = prefs.getString(KEY_APP_PASSWORD, null)
 		set(value) = prefs.edit { if (value != null) putString(KEY_APP_PASSWORD, value) else remove(KEY_APP_PASSWORD) }
 
+	var isBiometricProtectionEnabled: Boolean
+		get() = prefs.getBoolean(KEY_PROTECT_APP_BIOMETRIC, true)
+		set(value) = prefs.edit { putBoolean(KEY_PROTECT_APP_BIOMETRIC, value) }
+
 	var sourcesOrder: List<String>
 		get() = prefs.getString(KEY_SOURCES_ORDER, null)
 			?.split('|')
@@ -293,6 +297,7 @@ class AppSettings(context: Context) {
 		const val KEY_READER_MODE_DETECT = "reader_mode_detect"
 		const val KEY_APP_PASSWORD = "app_password"
 		const val KEY_PROTECT_APP = "protect_app"
+		const val KEY_PROTECT_APP_BIOMETRIC = "protect_app_bio"
 		const val KEY_APP_VERSION = "app_version"
 		const val KEY_ZOOM_MODE = "zoom_mode"
 		const val KEY_BACKUP = "backup"

app/src/main/java/org/koitharu/kotatsu/main/ui/protect/ProtectActivity.kt

@@ -96,6 +96,9 @@ class ProtectActivity :
 	}
 
 	private fun useFingerprint(): Boolean {
+		if (!viewModel.isBiometricEnabled) {
+			return false
+		}
 		if (BiometricManager.from(this).canAuthenticate(BIOMETRIC_WEAK) != BIOMETRIC_SUCCESS) {
 			return false
 		}

app/src/main/java/org/koitharu/kotatsu/main/ui/protect/ProtectViewModel.kt

@@ -19,6 +19,9 @@ class ProtectViewModel(
 
 	val onUnlockSuccess = SingleLiveEvent<Unit>()
 
+	val isBiometricEnabled
+		get() = settings.isBiometricProtectionEnabled
+
 	fun tryUnlock(password: String) {
 		if (job?.isActive == true) {
 			return

app/src/main/java/org/koitharu/kotatsu/settings/protect/ProtectSetupActivity.kt

@@ -1,5 +1,7 @@
 package org.koitharu.kotatsu.settings.protect
 
+import android.content.pm.PackageManager
+import android.os.Build
 import android.os.Bundle
 import android.text.Editable
 import android.text.TextWatcher
@@ -7,9 +9,11 @@ import android.view.KeyEvent
 import android.view.View
 import android.view.WindowManager
 import android.view.inputmethod.EditorInfo
+import android.widget.CompoundButton
 import android.widget.TextView
 import androidx.core.graphics.Insets
 import androidx.core.view.isGone
+import androidx.core.view.isVisible
 import org.koin.androidx.viewmodel.ext.android.viewModel
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.BaseActivity
@@ -18,7 +22,7 @@ import org.koitharu.kotatsu.databinding.ActivitySetupProtectBinding
 private const val MIN_PASSWORD_LENGTH = 4
 
 class ProtectSetupActivity : BaseActivity<ActivitySetupProtectBinding>(), TextWatcher,
-	View.OnClickListener, TextView.OnEditorActionListener {
+	View.OnClickListener, TextView.OnEditorActionListener, CompoundButton.OnCheckedChangeListener {
 
 	private val viewModel by viewModel<ProtectSetupViewModel>()
 
@@ -31,6 +35,9 @@ class ProtectSetupActivity : BaseActivity<ActivitySetupProtectBinding>(), TextWa
 		binding.buttonNext.setOnClickListener(this)
 		binding.buttonCancel.setOnClickListener(this)
 
+		binding.switchBiometric.isChecked = viewModel.isBiometricEnabled
+		binding.switchBiometric.setOnCheckedChangeListener(this)
+
 		viewModel.isSecondStep.observe(this, this::onStepChanged)
 		viewModel.onPasswordSet.observe(this) {
 			finishAfterTransition()
@@ -62,6 +69,10 @@ class ProtectSetupActivity : BaseActivity<ActivitySetupProtectBinding>(), TextWa
 		}
 	}
 
+	override fun onCheckedChanged(buttonView: CompoundButton?, isChecked: Boolean) {
+		viewModel.setBiometricEnabled(isChecked)
+	}
+
 	override fun onEditorAction(v: TextView?, actionId: Int, event: KeyEvent?): Boolean {
 		return if (actionId == EditorInfo.IME_ACTION_DONE && binding.buttonNext.isEnabled) {
 			binding.buttonNext.performClick()
@@ -85,6 +96,7 @@ class ProtectSetupActivity : BaseActivity<ActivitySetupProtectBinding>(), TextWa
 
 	private fun onStepChanged(isSecondStep: Boolean) {
 		binding.buttonCancel.isGone = isSecondStep
+		binding.switchBiometric.isVisible = isSecondStep && isBiometricAvailable()
 		if (isSecondStep) {
 			binding.layoutPassword.helperText = getString(R.string.repeat_password)
 			binding.buttonNext.setText(R.string.confirm)
@@ -93,4 +105,9 @@ class ProtectSetupActivity : BaseActivity<ActivitySetupProtectBinding>(), TextWa
 			binding.buttonNext.setText(R.string.next)
 		}
 	}
+
+	private fun isBiometricAvailable(): Boolean {
+		return Build.VERSION.SDK_INT >= Build.VERSION_CODES.M &&
+			packageManager.hasSystemFeature(PackageManager.FEATURE_FINGERPRINT)
+	}
 }

app/src/main/java/org/koitharu/kotatsu/settings/protect/ProtectSetupViewModel.kt

@@ -22,6 +22,9 @@ class ProtectSetupViewModel(
 	val onPasswordMismatch = SingleLiveEvent<Unit>()
 	val onClearText = SingleLiveEvent<Unit>()
 
+	val isBiometricEnabled
+		get() = settings.isBiometricProtectionEnabled
+
 	fun onNextClick(password: String) {
 		if (firstPassword.value == null) {
 			firstPassword.value = password
@@ -35,4 +38,8 @@ class ProtectSetupViewModel(
 			}
 		}
 	}
+
+	fun setBiometricEnabled(isEnabled: Boolean) {
+		settings.isBiometricProtectionEnabled = isEnabled
+	}
 }