84 lines
3.9 KiB
Markdown
84 lines
3.9 KiB
Markdown
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Android FingerprintDialog Sample
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===================================
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A sample that demonstrates to use registered fingerprints to authenticate the user in your app
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Introduction
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------------
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This sample demonstrates how you can use registered fingerprints in your app to authenticate the user
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before proceeding some actions such as purchasing an item.
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First you need to create a symmetric key in the Android Key Store using [KeyGenerator][1]
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which can be only be used after the user has authenticated with fingerprint and pass
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a [KeyGenParameterSpec][2].
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By setting [KeyGenParameterSpec.Builder.setUserAuthenticationRequired][3] to true, you can permit the
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use of the key only after the user authenticate it including when authenticated with the user's
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fingerprint.
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Then start listening to a fingerprint on the fingerprint sensor by calling
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[FingerprintManager.authenticate][4] with a [Cipher][5] initialized with the symmetric key created.
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Or alternatively you can fall back to server-side verified password as an authenticator.
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Once the fingerprint (or password) is verified, the
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[FingerprintManager.AuthenticationCallback#onAuthenticationSucceeded()][6] callback is called.
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[1]: https://developer.android.com/reference/javax/crypto/KeyGenerator.html
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[2]: https://developer.android.com/reference/android/security/keystore/KeyGenParameterSpec.html
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[3]: https://developer.android.com/reference/android/security/keystore/KeyGenParameterSpec.Builder.html#setUserAuthenticationRequired%28boolean%29
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[4]: https://developer.android.com/reference/android/hardware/fingerprint/FingerprintManager.html#authenticate%28android.hardware.fingerprint.FingerprintManager.CryptoObject,%20android.os.CancellationSignal,%20int,%20android.hardware.fingerprint.FingerprintManager.AuthenticationCallback,%20android.os.Handler%29
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[5]: https://developer.android.com/reference/javax/crypto/Cipher.html
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[6]: https://developer.android.com/reference/android/hardware/fingerprint/FingerprintManager.AuthenticationCallback.html#onAuthenticationSucceeded%28android.hardware.fingerprint.FingerprintManager.AuthenticationResult%29
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Pre-requisites
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--------------
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- Android SDK 26
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- Android Build Tools v27.0.2
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- Android Support Repository
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Screenshots
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-------------
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<img src="screenshots/1-purchase-screen.png" height="400" alt="Screenshot"/> <img src="screenshots/2-fingerprint-dialog.png" height="400" alt="Screenshot"/> <img src="screenshots/3-fingerprint-authenticated.png" height="400" alt="Screenshot"/> <img src="screenshots/4-new-fingerprint-enrolled.png" height="400" alt="Screenshot"/>
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Getting Started
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---------------
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This sample uses the Gradle build system. To build this project, use the
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"gradlew build" command or use "Import Project" in Android Studio.
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Support
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-------
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- Google+ Community: https://plus.google.com/communities/105153134372062985968
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- Stack Overflow: http://stackoverflow.com/questions/tagged/android
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If you've found an error in this sample, please file an issue:
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https://github.com/googlesamples/android-FingerprintDialog
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Patches are encouraged, and may be submitted by forking this project and
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submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.
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License
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-------
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Copyright 2017 The Android Open Source Project, Inc.
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Licensed to the Apache Software Foundation (ASF) under one or more contributor
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license agreements. See the NOTICE file distributed with this work for
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additional information regarding copyright ownership. The ASF licenses this
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file to you under the Apache License, Version 2.0 (the "License"); you may not
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use this file except in compliance with the License. You may obtain a copy of
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the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations under
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the License.
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