├── .gitignore
├── .idea
    ├── codeStyles
    │   └── codeStyleConfig.xml
    ├── runConfigurations.xml
    └── vcs.xml
├── LICENSE
├── README.md
├── app
    ├── .gitignore
    ├── build.gradle
    ├── proguard-rules.pro
    └── src
    │   ├── androidTest
    │       └── java
    │       │   └── me
    │       │       └── tatarka
    │       │           └── biometricssample
    │       │               └── ExampleInstrumentedTest.kt
    │   ├── main
    │       ├── AndroidManifest.xml
    │       ├── java
    │       │   └── me
    │       │   │   └── tatarka
    │       │   │       └── biometricssample
    │       │   │           ├── Crypto.kt
    │       │   │           └── MainActivity.kt
    │       └── res
    │       │   ├── drawable-v24
    │       │       └── ic_launcher_foreground.xml
    │       │   ├── drawable
    │       │       └── ic_launcher_background.xml
    │       │   ├── layout
    │       │       └── activity_main.xml
    │       │   ├── mipmap-anydpi-v26
    │       │       ├── ic_launcher.xml
    │       │       └── ic_launcher_round.xml
    │       │   ├── mipmap-hdpi
    │       │       ├── ic_launcher.png
    │       │       └── ic_launcher_round.png
    │       │   ├── mipmap-mdpi
    │       │       ├── ic_launcher.png
    │       │       └── ic_launcher_round.png
    │       │   ├── mipmap-xhdpi
    │       │       ├── ic_launcher.png
    │       │       └── ic_launcher_round.png
    │       │   ├── mipmap-xxhdpi
    │       │       ├── ic_launcher.png
    │       │       └── ic_launcher_round.png
    │       │   ├── mipmap-xxxhdpi
    │       │       ├── ic_launcher.png
    │       │       └── ic_launcher_round.png
    │       │   └── values
    │       │       ├── colors.xml
    │       │       ├── strings.xml
    │       │       └── styles.xml
    │   └── test
    │       └── java
    │           └── me
    │               └── tatarka
    │                   └── biometricssample
    │                       └── ExampleUnitTest.kt
├── build.gradle
├── gradle.properties
├── gradle
    └── wrapper
    │   ├── gradle-wrapper.jar
    │   └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
└── settings.gradle


/.gitignore:
--------------------------------------------------------------------------------
1 | *.iml
2 | .gradle
3 | /local.properties
4 | /.idea/
5 | .DS_Store
6 | /build
7 | /captures
8 | .externalNativeBuild
9 | 


--------------------------------------------------------------------------------
/.idea/codeStyles/codeStyleConfig.xml:
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1 | <component name="ProjectCodeStyleConfiguration">
2 |   <state>
3 |     <option name="USE_PER_PROJECT_SETTINGS" value="true" />
4 |   </state>
5 | </component>


--------------------------------------------------------------------------------
/.idea/runConfigurations.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <project version="4">
 3 |   <component name="RunConfigurationProducerService">
 4 |     <option name="ignoredProducers">
 5 |       <set>
 6 |         <option value="org.jetbrains.plugins.gradle.execution.test.runner.AllInPackageGradleConfigurationProducer" />
 7 |         <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestClassGradleConfigurationProducer" />
 8 |         <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestMethodGradleConfigurationProducer" />
 9 |       </set>
10 |     </option>
11 |   </component>
12 | </project>


--------------------------------------------------------------------------------
/.idea/vcs.xml:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <project version="4">
3 |   <component name="VcsDirectoryMappings">
4 |     <mapping directory="" vcs="Git" />
5 |   </component>
6 | </project>


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | MIT License
 2 | 
 3 | Copyright (c) 2019 Evan Tatarka
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # Biometric Sample
2 | 
3 | A sample implementation of the androidx biometric compat lib with all the workarounds needed for a
4 | production app. [MainActivity.kt](app/src/main/java/me/tatarka/biometricssample/MainActivity.kt)
5 | includes the logic to show the biometric prompt both at startup and on the click of a button.
6 | [Cyrpto.kt](app/src/main/java/me/tatarka/biometricssample/Crypto.kt) handles encrypting and
7 | decrypting data using asymmetric encryption. Both are heavily commented.


--------------------------------------------------------------------------------
/app/.gitignore:
--------------------------------------------------------------------------------
1 | /build
2 | 


--------------------------------------------------------------------------------
/app/build.gradle:
--------------------------------------------------------------------------------
 1 | apply plugin: 'com.android.application'
 2 | 
 3 | apply plugin: 'kotlin-android'
 4 | 
 5 | apply plugin: 'kotlin-android-extensions'
 6 | 
 7 | android {
 8 |     compileSdkVersion 29
 9 |     defaultConfig {
10 |         applicationId "me.tatarka.biometricscompatissue"
11 |         minSdkVersion 23
12 |         targetSdkVersion 29
13 |         versionCode 1
14 |         versionName "1.0"
15 |         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
16 |     }
17 |     buildTypes {
18 |         release {
19 |             minifyEnabled false
20 |             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
21 |         }
22 |     }
23 | }
24 | 
25 | dependencies {
26 |     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
27 |     implementation 'androidx.appcompat:appcompat:1.1.0'
28 |     implementation 'androidx.core:core-ktx:1.1.0'
29 |     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
30 |     implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.1.0'
31 |     implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.2.0-rc03'
32 |     implementation 'androidx.biometric:biometric:1.0.1'
33 |     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.0"
34 |     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.0"
35 |     testImplementation 'junit:junit:4.12'
36 |     androidTestImplementation 'androidx.test:runner:1.2.0'
37 |     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
38 | }
39 | 


--------------------------------------------------------------------------------
/app/proguard-rules.pro:
--------------------------------------------------------------------------------
 1 | # Add project specific ProGuard rules here.
 2 | # You can control the set of applied configuration files using the
 3 | # proguardFiles setting in build.gradle.
 4 | #
 5 | # For more details, see
 6 | #   http://developer.android.com/guide/developing/tools/proguard.html
 7 | 
 8 | # If your project uses WebView with JS, uncomment the following
 9 | # and specify the fully qualified class name to the JavaScript interface
10 | # class:
11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
12 | #   public *;
13 | #}
14 | 
15 | # Uncomment this to preserve the line number information for
16 | # debugging stack traces.
17 | #-keepattributes SourceFile,LineNumberTable
18 | 
19 | # If you keep the line number information, uncomment this to
20 | # hide the original source file name.
21 | #-renamesourcefileattribute SourceFile
22 | 


--------------------------------------------------------------------------------
/app/src/androidTest/java/me/tatarka/biometricssample/ExampleInstrumentedTest.kt:
--------------------------------------------------------------------------------
 1 | package me.tatarka.biometricssample
 2 | 
 3 | import androidx.test.InstrumentationRegistry
 4 | import androidx.test.runner.AndroidJUnit4
 5 | 
 6 | import org.junit.Test
 7 | import org.junit.runner.RunWith
 8 | 
 9 | import org.junit.Assert.*
10 | 
11 | /**
12 |  * Instrumented test, which will execute on an Android device.
13 |  *
14 |  * See [testing documentation](http://d.android.com/tools/testing).
15 |  */
16 | @RunWith(AndroidJUnit4::class)
17 | class ExampleInstrumentedTest {
18 |     @Test
19 |     fun useAppContext() {
20 |         // Context of the app under test.
21 |         val appContext = InstrumentationRegistry.getTargetContext()
22 |         assertEquals("me.tatarka.biometricscompatissue", appContext.packageName)
23 |     }
24 | }
25 | 


--------------------------------------------------------------------------------
/app/src/main/AndroidManifest.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3 |           package="me.tatarka.biometricssample">
 4 | 
 5 |     <application
 6 |             android:allowBackup="true"
 7 |             android:icon="@mipmap/ic_launcher"
 8 |             android:label="@string/app_name"
 9 |             android:roundIcon="@mipmap/ic_launcher_round"
10 |             android:supportsRtl="true"
11 |             android:theme="@style/AppTheme">
12 |         <activity android:name="me.tatarka.biometricssample.MainActivity">
13 |             <intent-filter>
14 |                 <action android:name="android.intent.action.MAIN"/>
15 | 
16 |                 <category android:name="android.intent.category.LAUNCHER"/>
17 |             </intent-filter>
18 |         </activity>
19 |     </application>
20 | 
21 | </manifest>


--------------------------------------------------------------------------------
/app/src/main/java/me/tatarka/biometricssample/Crypto.kt:
--------------------------------------------------------------------------------
  1 | package me.tatarka.biometricssample
  2 | 
  3 | import android.security.keystore.KeyGenParameterSpec
  4 | import android.security.keystore.KeyProperties
  5 | import kotlinx.coroutines.Dispatchers
  6 | import kotlinx.coroutines.withContext
  7 | import java.nio.ByteBuffer
  8 | import java.security.*
  9 | import java.security.spec.MGF1ParameterSpec
 10 | import java.security.spec.X509EncodedKeySpec
 11 | import javax.crypto.Cipher
 12 | import javax.crypto.KeyGenerator
 13 | import javax.crypto.spec.GCMParameterSpec
 14 | import javax.crypto.spec.OAEPParameterSpec
 15 | import javax.crypto.spec.PSource
 16 | 
 17 | /*
 18 |     Asymmetric encryption using key wrapping with RSA and AES. This allows you to encrypt data
 19 |     without asking for biometrics, while requiring it to decrypt.
 20 | */
 21 | 
 22 | private val KEY_ALIAS = "key"
 23 | private val AES_KEY_SIZE = 128
 24 | private val AES_CIPHER = "AES/GCM/NoPadding"
 25 | // The device ui freezes while the key is being generated (yes even though it's on a background thread),
 26 | // this is as big as we can go before its very noticeable.
 27 | private val RSA_KEY_SIZE = 1024
 28 | private val RSA_CIPHER = "RSA/ECB/OAEPWithSHA-512AndMGF1Padding"
 29 | 
 30 | private val keyStore by lazy(LazyThreadSafetyMode.NONE) {
 31 |     KeyStore.getInstance("AndroidKeyStore").apply { load(null) }
 32 | }
 33 | 
 34 | private val aesCipher by lazy(LazyThreadSafetyMode.NONE) {
 35 |     Cipher.getInstance(AES_CIPHER)
 36 | }
 37 | 
 38 | private val rsaCipher by lazy(LazyThreadSafetyMode.NONE) {
 39 |     Cipher.getInstance(RSA_CIPHER)
 40 | }
 41 | 
 42 | /**
 43 |  * Generate a symmetric AES key
 44 |  */
 45 | private fun createKey() = KeyGenerator.getInstance("AES").apply { init(AES_KEY_SIZE) }.generateKey()
 46 | 
 47 | /**
 48 |  * Generate an asymmetric RSA key pair
 49 |  */
 50 | private fun createKeyPair(keyStore: KeyStore) =
 51 |     KeyPairGenerator.getInstance("RSA", keyStore.provider).apply {
 52 |         initialize(
 53 |             KeyGenParameterSpec.Builder(KEY_ALIAS, KeyProperties.PURPOSE_DECRYPT)
 54 |                 .setDigests(KeyProperties.DIGEST_SHA256, KeyProperties.DIGEST_SHA512)
 55 |                 .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_OAEP)
 56 |                 .setKeySize(RSA_KEY_SIZE)
 57 |                 .setUserAuthenticationRequired(true)
 58 |                 .build()
 59 |         )
 60 |     }.generateKeyPair()
 61 | 
 62 | /**
 63 |  * Gets an RSA cipher, applying work-arounds for bugs on api 23.
 64 |  */
 65 | private fun rsaCipher(keyStore: KeyStore, opmode: Int) = rsaCipher.apply {
 66 |     /*
 67 |         A known bug in the Android 6.0 (API Level 23) implementation of Bouncy Castle
 68 |         RSA OAEP causes the cipher to default to an SHA-1 certificate, making the SHA-256
 69 |         certificate of the public key incompatible
 70 |                 To work around this issue, explicitly provide a new OAEP specification upon
 71 |         initialization
 72 |         https://code.google.com/p/android/issues/detail?id=197719
 73 |     */
 74 |     val spec =
 75 |         OAEPParameterSpec("SHA-256", "MGF1", MGF1ParameterSpec.SHA1, PSource.PSpecified.DEFAULT)
 76 |     val key = if (opmode == Cipher.WRAP_MODE) {
 77 |         val publicKey = publicKey(keyStore)
 78 |         /*
 79 |             A known bug in Android 6.0 (API Level 23) causes user authentication-related
 80 |             authorizations to be enforced even for public keys
 81 |             To work around this issue, extract the public key material to use outside of
 82 |             the Android Keystore
 83 |             http://developer.android.com/reference/android/security/keystore/KeyGenParameterSpec.html
 84 |           */
 85 |         KeyFactory.getInstance(publicKey.algorithm)
 86 |             .generatePublic(X509EncodedKeySpec(publicKey.encoded))
 87 |     } else {
 88 |         privateKey(keyStore)
 89 |     }
 90 |     init(opmode, key, spec)
 91 | }
 92 | 
 93 | /**
 94 |  * Gets or creates the RSA public key
 95 |  */
 96 | private fun publicKey(keyStore: KeyStore): PublicKey {
 97 |     if (keyStore.containsAlias(KEY_ALIAS)) {
 98 |         val certificate = keyStore.getCertificate(KEY_ALIAS)
 99 |         if (certificate != null) {
100 |             return certificate.publicKey
101 |         } else {
102 |             keyStore.deleteEntry(KEY_ALIAS)
103 |         }
104 |     }
105 |     return createKeyPair(keyStore).public
106 | }
107 | 
108 | /**
109 |  * Gets or creates the RSA private key
110 |  */
111 | private fun privateKey(keyStore: KeyStore): PrivateKey {
112 |     if (keyStore.containsAlias(KEY_ALIAS)) {
113 |         val key = try {
114 |             keyStore.getKey(KEY_ALIAS, null)
115 |         } catch (e: GeneralSecurityException) {
116 |             keyStore.deleteEntry(KEY_ALIAS)
117 |             throw GeneralSecurityException(e)
118 |         }
119 |         if (key is PrivateKey) {
120 |             return key
121 |         } else {
122 |             keyStore.deleteEntry(KEY_ALIAS)
123 |         }
124 |     }
125 |     return createKeyPair(keyStore).private
126 | }
127 | 
128 | /**
129 |  * Encrypts the given input. This does not require the user to unlock the key with biometrics as
130 |  * only the public key is used.
131 |  */
132 | suspend fun encrypt(input: ByteArray): ByteArray {
133 |     return withContext(Dispatchers.IO) {
134 |         // RSA(key) + iv + AES(key, input)
135 |         val key = createKey()
136 |         val (encryptedInput, iv) = aesCipher.run {
137 |             init(Cipher.ENCRYPT_MODE, key)
138 |             doFinal(input) to iv
139 |         }
140 |         val cipher = rsaCipher(keyStore, Cipher.WRAP_MODE)
141 |         val encryptedKey = cipher.wrap(key)
142 |         val output =
143 |             ByteBuffer.allocate(4 + encryptedKey.size + 4 + iv.size + encryptedInput.size).apply {
144 |                 putInt(encryptedKey.size)
145 |                 put(encryptedKey)
146 |                 putInt(iv.size)
147 |                 put(iv)
148 |                 put(encryptedInput)
149 |             }
150 |         output.array()
151 |     }
152 | }
153 | 
154 | /**
155 |  * Decrypts the given input. The authenticator callback should unlock the cipher by prompting the
156 |  * user for biometrics.
157 |  */
158 | suspend fun decrypt(input: ByteArray, authenticator: suspend (Cipher) -> Cipher): ByteArray {
159 |     return withContext(Dispatchers.IO) {
160 |         val lockedCipher = rsaCipher(keyStore, Cipher.UNWRAP_MODE)
161 |         val cipher = withContext(Dispatchers.Main) { authenticator(lockedCipher) }
162 |         // No data to decrypt
163 |         if (input.isEmpty()) {
164 |             return@withContext ByteArray(0)
165 |         }
166 |         ByteBuffer.wrap(input).run {
167 |             val keyLength = getInt()
168 |             val encryptedKey = ByteArray(keyLength).also { get(it) }
169 |             val ivLength = getInt()
170 |             val iv = ByteArray(ivLength).also { get(it) }
171 |             val encryptedOutput =
172 |                 ByteArray(input.size - keyLength - 4 - ivLength - 4).also { get(it) }
173 |             val aesKey = cipher.unwrap(encryptedKey, "AES", Cipher.SECRET_KEY)
174 |             aesCipher.apply { init(Cipher.DECRYPT_MODE, aesKey, GCMParameterSpec(128, iv)) }
175 |                 .doFinal(encryptedOutput)
176 |         }
177 |     }
178 | }
179 | 
180 | 


--------------------------------------------------------------------------------
/app/src/main/java/me/tatarka/biometricssample/MainActivity.kt:
--------------------------------------------------------------------------------
  1 | package me.tatarka.biometricssample
  2 | 
  3 | import android.content.Context
  4 | import android.os.Build
  5 | import android.os.Bundle
  6 | import android.security.keystore.KeyGenParameterSpec
  7 | import android.security.keystore.KeyProperties
  8 | import android.util.Base64
  9 | import android.util.Log
 10 | import android.view.View
 11 | import android.view.ViewTreeObserver
 12 | import androidx.appcompat.app.AlertDialog
 13 | import androidx.appcompat.app.AppCompatActivity
 14 | import androidx.biometric.BiometricManager
 15 | import androidx.biometric.BiometricManager.BIOMETRIC_SUCCESS
 16 | import androidx.biometric.BiometricPrompt
 17 | import androidx.core.content.ContextCompat
 18 | import androidx.lifecycle.lifecycleScope
 19 | import kotlinx.android.synthetic.main.activity_main.*
 20 | import kotlinx.coroutines.launch
 21 | import java.security.GeneralSecurityException
 22 | import java.security.InvalidAlgorithmParameterException
 23 | import java.security.KeyException
 24 | import java.security.KeyStore
 25 | import javax.crypto.KeyGenerator
 26 | import kotlin.coroutines.resume
 27 | import kotlin.coroutines.resumeWithException
 28 | import kotlin.coroutines.suspendCoroutine
 29 | 
 30 | class MainActivity : AppCompatActivity() {
 31 | 
 32 |     override fun onCreate(savedInstanceState: Bundle?) {
 33 |         super.onCreate(savedInstanceState)
 34 |         setContentView(R.layout.activity_main)
 35 | 
 36 |         text.text = "Api: " + Build.VERSION.SDK_INT
 37 | 
 38 |         button.setOnClickListener {
 39 |             showBiometricPrompt()
 40 |         }
 41 | 
 42 |         encrypt.setOnClickListener {
 43 |             lifecycleScope.launch {
 44 |                 try {
 45 |                     val encryptedData = encrypt(data.text.toString().toByteArray())
 46 |                     encrypted.text = Base64.encodeToString(encryptedData, 0)
 47 |                 } catch (e: GeneralSecurityException) {
 48 |                     AlertDialog.Builder(this@MainActivity)
 49 |                         .setTitle("Biometrics Error")
 50 |                         .setMessage(e.message)
 51 |                         .setPositiveButton("Ok", null)
 52 |                         .show()
 53 |                 }
 54 |             }
 55 |         }
 56 |     }
 57 | 
 58 |     override fun onResume() {
 59 |         super.onResume()
 60 | 
 61 |         if (canSecurelyAuthenticate(applicationContext)) {
 62 |             // Showing the biometrics prompt will be ignored if the app does not have focus. You may
 63 |             // think that this will always be the case if you are resumed, it is not.
 64 |             if (hasWindowFocus()) {
 65 |                 showBiometricPrompt()
 66 |             } else {
 67 |                 window.decorView.viewTreeObserver.addOnWindowFocusChangeListener(object :
 68 |                     ViewTreeObserver.OnWindowFocusChangeListener {
 69 |                     override fun onWindowFocusChanged(hasFocus: Boolean) {
 70 |                         if (hasFocus) {
 71 |                             window.decorView.viewTreeObserver.removeOnWindowFocusChangeListener(
 72 |                                 this
 73 |                             )
 74 |                             showBiometricPrompt()
 75 |                         }
 76 |                     }
 77 |                 })
 78 |             }
 79 |         }
 80 |     }
 81 | 
 82 |     private fun showProgress(shown: Boolean) {
 83 |         progress.visibility = if (shown) View.VISIBLE else View.INVISIBLE
 84 |     }
 85 | 
 86 |     private fun showBiometricPrompt() {
 87 |         // The coroutine stuff is to make sure crypto is preformed on a background thread while the
 88 |         // prompt is shown on the main thread.
 89 |         lifecycleScope.launch {
 90 |             try {
 91 |                 val decryptedData = decrypt(Base64.decode(encrypted.text.toString(), 0)) { cipher ->
 92 |                     // On api 28 if the user is locked out of biometrics from too many failed
 93 |                     // attempts there will be a long delay before getting the error back. So the
 94 |                     // user isn't confused as to what is going on, show a loading indicator.
 95 |                     if (Build.VERSION.SDK_INT == 28) {
 96 |                         showProgress(true)
 97 | 
 98 |                         // The only way to tell that the prompt is shown is to listen to the window
 99 |                         // losing focus events.
100 |                         window.decorView.viewTreeObserver.addOnWindowFocusChangeListener(object :
101 |                             ViewTreeObserver.OnWindowFocusChangeListener {
102 |                             override fun onWindowFocusChanged(hasFocus: Boolean) {
103 |                                 if (!hasFocus) {
104 |                                     window.decorView.viewTreeObserver.removeOnWindowFocusChangeListener(
105 |                                         this
106 |                                     )
107 |                                     showProgress(false)
108 |                                 }
109 |                             }
110 |                         })
111 |                     }
112 | 
113 |                     suspendCoroutine { continuation ->
114 |                         BiometricPrompt(
115 |                             this@MainActivity,
116 |                             // Run callbacks on the main thread
117 |                             ContextCompat.getMainExecutor(this@MainActivity),
118 |                             object : BiometricPrompt.AuthenticationCallback() {
119 |                                 private var authenticationFailed = false
120 | 
121 |                                 override fun onAuthenticationError(
122 |                                     errorCode: Int,
123 |                                     errString: CharSequence
124 |                                 ) {
125 |                                     val shouldShow =
126 |                                         !isCancel(errorCode) && !authenticationFailed
127 |                                     continuation.resumeWithException(
128 |                                         BiometricException(
129 |                                             errorCode,
130 |                                             errString,
131 |                                             shouldShow
132 |                                         )
133 |                                     )
134 |                                 }
135 | 
136 |                                 override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
137 |                                     continuation.resume(result.cryptoObject!!.cipher!!)
138 |                                 }
139 | 
140 |                                 override fun onAuthenticationFailed() {
141 |                                     // This means the dialog was shown, so we don't want to show the
142 |                                     // error again ourselves
143 |                                     authenticationFailed = true
144 |                                 }
145 | 
146 |                                 /**
147 |                                  * If the prompt was canceled by the user we don't want to show an error ourselves
148 |                                  */
149 |                                 fun isCancel(errorCode: Int) =
150 |                                     errorCode == BiometricPrompt.ERROR_USER_CANCELED
151 |                                             || errorCode == BiometricPrompt.ERROR_NEGATIVE_BUTTON
152 | 
153 |                             }).authenticate(
154 |                             BiometricPrompt.PromptInfo.Builder()
155 |                                 .setTitle("Title")
156 |                                 .setDescription("Description")
157 |                                 .setNegativeButtonText("Cancel")
158 |                                 .build(),
159 |                             // A CryptoObject is required to ensure 'secure' biometrics. Even if you don't need to
160 |                             // unlock what you pass here, you need to pass something or the device may use a
161 |                             // different weaker form of biometrics.
162 |                             BiometricPrompt.CryptoObject(cipher)
163 |                         )
164 |                     }
165 |                 }
166 |                 decrypted.text = String(decryptedData)
167 |             } catch (e: BiometricException) {
168 |                 // Hide the previously shown loading indicator if there's an error.
169 |                 if (Build.VERSION.SDK_INT == 28) {
170 |                     showProgress(false)
171 |                 }
172 |                 if (e.shouldShow) {
173 |                     AlertDialog.Builder(this@MainActivity)
174 |                         .setTitle("Biometrics Error")
175 |                         .setMessage(e.errString)
176 |                         .setPositiveButton("Ok", null)
177 |                         .show()
178 |                 }
179 |             } catch (e: GeneralSecurityException) {
180 |                 AlertDialog.Builder(this@MainActivity)
181 |                     .setTitle("Biometrics Error")
182 |                     .setMessage(e.message)
183 |                     .setPositiveButton("Ok", null)
184 |                     .show()
185 |             }
186 |         }
187 |     }
188 | }
189 | 
190 | /**
191 |  * Checks if we can securely authenticate, i.e. we have secure biometrics hardware and the user can
192 |  * enroll. [androidx.biometric.BiometricManager.canAuthenticate] is insufficient for this because
193 |  * on api 29+ it checks for any form of biometrics, not just ones that are 'secure', so we can
194 |  * get a false-positive.
195 |  */
196 | private fun canSecurelyAuthenticate(context: Context): Boolean {
197 |     if (Build.VERSION.SDK_INT < 23) {
198 |         return false
199 |     }
200 |     try {
201 |         val keystore = KeyStore.getInstance("AndroidKeyStore")
202 |         KeyGenerator.getInstance("AES", keystore.provider)
203 |             .init(
204 |                 KeyGenParameterSpec.Builder("DUMMY_KEY_ALIAS", KeyProperties.PURPOSE_DECRYPT)
205 |                     .setUserAuthenticationRequired(true)
206 |                     .build()
207 |             )
208 |         // On API 24 & 25 regardless of enrollment, as well as devices on API < 29 that have other
209 |         // forms of biometrics enrolled eg. Samsung's iris scan, the above will not throw, but
210 |         // BiometricPrompt will still throw an error when shown. Check the biometric manager as a fallback.
211 |         return BiometricManager.from(context).canAuthenticate() == BIOMETRIC_SUCCESS
212 |     } catch (e: InvalidAlgorithmParameterException) {
213 |         // expected error if user isn't enrolled in secure biometrics
214 |         return false
215 |     } catch (e: Exception) {
216 |         // Log unexpected errors, though if there's an issue with the keystore we probably can't use
217 |         // biometrics anyway.
218 |         Log.w("BiometricSample", e)
219 |         return false
220 |     }
221 | }
222 | 
223 | class BiometricException(
224 |     val code: Int,
225 |     val errString: CharSequence,
226 |     /**
227 |      * If true, we need to show the error to the user.
228 |      */
229 |     val shouldShow: Boolean
230 | ) : Exception("$errString ($code)")
231 | 


--------------------------------------------------------------------------------
/app/src/main/res/drawable-v24/ic_launcher_foreground.xml:
--------------------------------------------------------------------------------
 1 | <vector xmlns:android="http://schemas.android.com/apk/res/android"
 2 |         xmlns:aapt="http://schemas.android.com/aapt"
 3 |         android:width="108dp"
 4 |         android:height="108dp"
 5 |         android:viewportHeight="108"
 6 |         android:viewportWidth="108">
 7 |     <path
 8 |             android:fillType="evenOdd"
 9 |             android:pathData="M32,64C32,64 38.39,52.99 44.13,50.95C51.37,48.37 70.14,49.57 70.14,49.57L108.26,87.69L108,109.01L75.97,107.97L32,64Z"
10 |             android:strokeColor="#00000000"
11 |             android:strokeWidth="1">
12 |         <aapt:attr name="android:fillColor">
13 |             <gradient
14 |                     android:endX="78.5885"
15 |                     android:endY="90.9159"
16 |                     android:startX="48.7653"
17 |                     android:startY="61.0927"
18 |                     android:type="linear">
19 |                 <item
20 |                         android:color="#44000000"
21 |                         android:offset="0.0"/>
22 |                 <item
23 |                         android:color="#00000000"
24 |                         android:offset="1.0"/>
25 |             </gradient>
26 |         </aapt:attr>
27 |     </path>
28 |     <path
29 |             android:fillColor="#FFFFFF"
30 |             android:fillType="nonZero"
31 |             android:pathData="M66.94,46.02L66.94,46.02C72.44,50.07 76,56.61 76,64L32,64C32,56.61 35.56,50.11 40.98,46.06L36.18,41.19C35.45,40.45 35.45,39.3 36.18,38.56C36.91,37.81 38.05,37.81 38.78,38.56L44.25,44.05C47.18,42.57 50.48,41.71 54,41.71C57.48,41.71 60.78,42.57 63.68,44.05L69.11,38.56C69.84,37.81 70.98,37.81 71.71,38.56C72.44,39.3 72.44,40.45 71.71,41.19L66.94,46.02ZM62.94,56.92C64.08,56.92 65,56.01 65,54.88C65,53.76 64.08,52.85 62.94,52.85C61.8,52.85 60.88,53.76 60.88,54.88C60.88,56.01 61.8,56.92 62.94,56.92ZM45.06,56.92C46.2,56.92 47.13,56.01 47.13,54.88C47.13,53.76 46.2,52.85 45.06,52.85C43.92,52.85 43,53.76 43,54.88C43,56.01 43.92,56.92 45.06,56.92Z"
32 |             android:strokeColor="#00000000"
33 |             android:strokeWidth="1"/>
34 | </vector>
35 | 


--------------------------------------------------------------------------------
/app/src/main/res/drawable/ic_launcher_background.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <vector
 3 |         xmlns:android="http://schemas.android.com/apk/res/android"
 4 |         android:height="108dp"
 5 |         android:width="108dp"
 6 |         android:viewportHeight="108"
 7 |         android:viewportWidth="108">
 8 |     <path android:fillColor="#008577"
 9 |           android:pathData="M0,0h108v108h-108z"/>
10 |     <path android:fillColor="#00000000" android:pathData="M9,0L9,108"
11 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
12 |     <path android:fillColor="#00000000" android:pathData="M19,0L19,108"
13 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
14 |     <path android:fillColor="#00000000" android:pathData="M29,0L29,108"
15 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
16 |     <path android:fillColor="#00000000" android:pathData="M39,0L39,108"
17 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
18 |     <path android:fillColor="#00000000" android:pathData="M49,0L49,108"
19 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
20 |     <path android:fillColor="#00000000" android:pathData="M59,0L59,108"
21 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
22 |     <path android:fillColor="#00000000" android:pathData="M69,0L69,108"
23 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
24 |     <path android:fillColor="#00000000" android:pathData="M79,0L79,108"
25 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
26 |     <path android:fillColor="#00000000" android:pathData="M89,0L89,108"
27 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
28 |     <path android:fillColor="#00000000" android:pathData="M99,0L99,108"
29 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
30 |     <path android:fillColor="#00000000" android:pathData="M0,9L108,9"
31 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
32 |     <path android:fillColor="#00000000" android:pathData="M0,19L108,19"
33 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
34 |     <path android:fillColor="#00000000" android:pathData="M0,29L108,29"
35 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
36 |     <path android:fillColor="#00000000" android:pathData="M0,39L108,39"
37 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
38 |     <path android:fillColor="#00000000" android:pathData="M0,49L108,49"
39 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
40 |     <path android:fillColor="#00000000" android:pathData="M0,59L108,59"
41 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
42 |     <path android:fillColor="#00000000" android:pathData="M0,69L108,69"
43 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
44 |     <path android:fillColor="#00000000" android:pathData="M0,79L108,79"
45 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
46 |     <path android:fillColor="#00000000" android:pathData="M0,89L108,89"
47 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
48 |     <path android:fillColor="#00000000" android:pathData="M0,99L108,99"
49 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
50 |     <path android:fillColor="#00000000" android:pathData="M19,29L89,29"
51 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
52 |     <path android:fillColor="#00000000" android:pathData="M19,39L89,39"
53 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
54 |     <path android:fillColor="#00000000" android:pathData="M19,49L89,49"
55 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
56 |     <path android:fillColor="#00000000" android:pathData="M19,59L89,59"
57 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
58 |     <path android:fillColor="#00000000" android:pathData="M19,69L89,69"
59 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
60 |     <path android:fillColor="#00000000" android:pathData="M19,79L89,79"
61 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
62 |     <path android:fillColor="#00000000" android:pathData="M29,19L29,89"
63 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
64 |     <path android:fillColor="#00000000" android:pathData="M39,19L39,89"
65 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
66 |     <path android:fillColor="#00000000" android:pathData="M49,19L49,89"
67 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
68 |     <path android:fillColor="#00000000" android:pathData="M59,19L59,89"
69 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
70 |     <path android:fillColor="#00000000" android:pathData="M69,19L69,89"
71 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
72 |     <path android:fillColor="#00000000" android:pathData="M79,19L79,89"
73 |           android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
74 | </vector>
75 | 


--------------------------------------------------------------------------------
/app/src/main/res/layout/activity_main.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3 |         xmlns:app="http://schemas.android.com/apk/res-auto"
 4 |         xmlns:tools="http://schemas.android.com/tools"
 5 |         android:layout_width="match_parent"
 6 |         android:layout_height="match_parent"
 7 |         tools:context=".MainActivity">
 8 | 
 9 |     <TextView
10 |             android:id="@+id/text"
11 |             android:layout_width="wrap_content"
12 |             android:layout_height="wrap_content"
13 |             app:layout_constraintBottom_toBottomOf="parent"
14 |             app:layout_constraintLeft_toLeftOf="parent"
15 |             app:layout_constraintRight_toRightOf="parent"
16 |             app:layout_constraintTop_toTopOf="parent"
17 |             tools:text="Api 27" />
18 | 
19 |     <ProgressBar
20 |             android:id="@+id/progress"
21 |             android:layout_width="wrap_content"
22 |             android:layout_height="wrap_content"
23 |             android:layout_marginTop="16dp"
24 |             android:visibility="invisible"
25 |             app:layout_constraintEnd_toEndOf="parent"
26 |             app:layout_constraintStart_toStartOf="parent"
27 |             app:layout_constraintTop_toTopOf="parent" />
28 | 
29 |     <EditText
30 |             android:id="@+id/data"
31 |             android:layout_width="0dp"
32 |             android:layout_height="wrap_content"
33 |             android:layout_marginStart="16dp"
34 |             android:layout_marginEnd="16dp"
35 |             android:hint="Data"
36 |             app:layout_constraintEnd_toStartOf="@+id/encrypt"
37 |             app:layout_constraintStart_toStartOf="parent"
38 |             app:layout_constraintTop_toBottomOf="@+id/progress" />
39 | 
40 |     <Button
41 |             android:id="@+id/encrypt"
42 |             android:layout_width="wrap_content"
43 |             android:layout_height="wrap_content"
44 |             android:layout_marginEnd="16dp"
45 |             android:text="Encrypt"
46 |             app:layout_constraintEnd_toEndOf="parent"
47 |             app:layout_constraintTop_toBottomOf="@+id/progress" />
48 | 
49 |     <TextView
50 |             android:id="@+id/encrypted"
51 |             android:layout_width="0dp"
52 |             android:layout_height="wrap_content"
53 |             android:layout_marginStart="16dp"
54 |             android:layout_marginEnd="16dp"
55 |             app:layout_constraintEnd_toEndOf="parent"
56 |             app:layout_constraintStart_toStartOf="parent"
57 |             app:layout_constraintTop_toBottomOf="@+id/data"
58 |             tools:text="Encrypted" />
59 | 
60 |     <TextView
61 |             android:id="@+id/decrypted"
62 |             android:layout_width="0dp"
63 |             android:layout_height="wrap_content"
64 |             android:layout_marginStart="16dp"
65 |             android:layout_marginEnd="16dp"
66 |             app:layout_constraintEnd_toEndOf="parent"
67 |             app:layout_constraintStart_toStartOf="parent"
68 |             app:layout_constraintTop_toBottomOf="@+id/encrypted"
69 |             tools:text="Decrypted" />
70 | 
71 |     <Button
72 |             android:id="@+id/button"
73 |             android:layout_width="wrap_content"
74 |             android:layout_height="wrap_content"
75 |             android:layout_marginStart="8dp"
76 |             android:layout_marginEnd="8dp"
77 |             android:layout_marginBottom="8dp"
78 |             android:text="Authenticate with biometrics"
79 |             app:layout_constraintBottom_toBottomOf="parent"
80 |             app:layout_constraintEnd_toEndOf="parent"
81 |             app:layout_constraintStart_toStartOf="parent" />
82 | </androidx.constraintlayout.widget.ConstraintLayout>


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/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml:
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1 | <?xml version="1.0" encoding="utf-8"?>
2 | <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
3 |     <background android:drawable="@drawable/ic_launcher_background"/>
4 |     <foreground android:drawable="@drawable/ic_launcher_foreground"/>
5 | </adaptive-icon>


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/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml:
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1 | <?xml version="1.0" encoding="utf-8"?>
2 | <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
3 |     <background android:drawable="@drawable/ic_launcher_background"/>
4 |     <foreground android:drawable="@drawable/ic_launcher_foreground"/>
5 | </adaptive-icon>


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/app/src/main/res/mipmap-hdpi/ic_launcher.png:
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/app/src/main/res/mipmap-hdpi/ic_launcher_round.png:
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/app/src/main/res/mipmap-mdpi/ic_launcher.png:
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/app/src/main/res/mipmap-mdpi/ic_launcher_round.png:
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/app/src/main/res/mipmap-xhdpi/ic_launcher.png:
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/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png:
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/app/src/main/res/mipmap-xxhdpi/ic_launcher.png:
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/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png:
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/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png:
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/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png:
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/app/src/main/res/values/colors.xml:
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1 | <?xml version="1.0" encoding="utf-8"?>
2 | <resources>
3 |     <color name="colorPrimary">#008577</color>
4 |     <color name="colorPrimaryDark">#00574B</color>
5 |     <color name="colorAccent">#0288D1</color>
6 | </resources>
7 | 


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/app/src/main/res/values/strings.xml:
--------------------------------------------------------------------------------
1 | <resources>
2 |     <string name="app_name">Biometrics Sample</string>
3 | </resources>
4 | 


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/app/src/main/res/values/styles.xml:
--------------------------------------------------------------------------------
 1 | <resources>
 2 | 
 3 |     <!-- Base application theme. -->
 4 |     <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
 5 |         <!-- Customize your theme here. -->
 6 |         <item name="colorPrimary">@color/colorPrimary</item>
 7 |         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
 8 |         <item name="colorAccent">@color/colorAccent</item>
 9 |     </style>
10 | 
11 | </resources>
12 | 


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/app/src/test/java/me/tatarka/biometricssample/ExampleUnitTest.kt:
--------------------------------------------------------------------------------
 1 | package me.tatarka.biometricssample
 2 | 
 3 | import org.junit.Test
 4 | 
 5 | import org.junit.Assert.*
 6 | 
 7 | /**
 8 |  * Example local unit test, which will execute on the development machine (host).
 9 |  *
10 |  * See [testing documentation](http://d.android.com/tools/testing).
11 |  */
12 | class ExampleUnitTest {
13 |     @Test
14 |     fun addition_isCorrect() {
15 |         assertEquals(4, 2 + 2)
16 |     }
17 | }
18 | 


--------------------------------------------------------------------------------
/build.gradle:
--------------------------------------------------------------------------------
 1 | // Top-level build file where you can add configuration options common to all sub-projects/modules.
 2 | 
 3 | buildscript {
 4 |     ext.kotlin_version = '1.3.50'
 5 | 
 6 |     repositories {
 7 |         google()
 8 |         jcenter()
 9 |         
10 |     }
11 |     dependencies {
12 |         classpath 'com.android.tools.build:gradle:3.5.2'
13 |         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
14 |         // NOTE: Do not place your application dependencies here; they belong
15 |         // in the individual module build.gradle files
16 |     }
17 | }
18 | 
19 | allprojects {
20 |     repositories {
21 |         google()
22 |         jcenter()
23 |         
24 |     }
25 | }
26 | 
27 | task clean(type: Delete) {
28 |     delete rootProject.buildDir
29 | }
30 | 


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/gradle.properties:
--------------------------------------------------------------------------------
 1 | # Project-wide Gradle settings.
 2 | # IDE (e.g. Android Studio) users:
 3 | # Gradle settings configured through the IDE *will override*
 4 | # any settings specified in this file.
 5 | # For more details on how to configure your build environment visit
 6 | # http://www.gradle.org/docs/current/userguide/build_environment.html
 7 | # Specifies the JVM arguments used for the daemon process.
 8 | # The setting is particularly useful for tweaking memory settings.
 9 | org.gradle.jvmargs=-Xmx1536m
10 | # When configured, Gradle will run in incubating parallel mode.
11 | # This option should only be used with decoupled projects. More details, visit
12 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
13 | # org.gradle.parallel=true
14 | # AndroidX package structure to make it clearer which packages are bundled with the
15 | # Android operating system, and which are packaged with your app's APK
16 | # https://developer.android.com/topic/libraries/support-library/androidx-rn
17 | android.useAndroidX=true
18 | # Automatically convert third-party libraries to use AndroidX
19 | android.enableJetifier=true
20 | # Kotlin code style for this project: "official" or "obsolete":
21 | kotlin.code.style=official
22 | 


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/gradle/wrapper/gradle-wrapper.jar:
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/gradle/wrapper/gradle-wrapper.properties:
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1 | #Fri Nov 09 19:59:09 EST 2018
2 | distributionBase=GRADLE_USER_HOME
3 | distributionPath=wrapper/dists
4 | zipStoreBase=GRADLE_USER_HOME
5 | zipStorePath=wrapper/dists
6 | distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-bin.zip
7 | 


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/gradlew:
--------------------------------------------------------------------------------
  1 | #!/usr/bin/env sh
  2 | 
  3 | ##############################################################################
  4 | ##
  5 | ##  Gradle start up script for UN*X
  6 | ##
  7 | ##############################################################################
  8 | 
  9 | # Attempt to set APP_HOME
 10 | # Resolve links: $0 may be a link
 11 | PRG="$0"
 12 | # Need this for relative symlinks.
 13 | while [ -h "$PRG" ] ; do
 14 |     ls=`ls -ld "$PRG"`
 15 |     link=`expr "$ls" : '.*-> \(.*\)$'`
 16 |     if expr "$link" : '/.*' > /dev/null; then
 17 |         PRG="$link"
 18 |     else
 19 |         PRG=`dirname "$PRG"`"/$link"
 20 |     fi
 21 | done
 22 | SAVED="`pwd`"
 23 | cd "`dirname \"$PRG\"`/" >/dev/null
 24 | APP_HOME="`pwd -P`"
 25 | cd "$SAVED" >/dev/null
 26 | 
 27 | APP_NAME="Gradle"
 28 | APP_BASE_NAME=`basename "$0"`
 29 | 
 30 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 31 | DEFAULT_JVM_OPTS=""
 32 | 
 33 | # Use the maximum available, or set MAX_FD != -1 to use that value.
 34 | MAX_FD="maximum"
 35 | 
 36 | warn () {
 37 |     echo "$*"
 38 | }
 39 | 
 40 | die () {
 41 |     echo
 42 |     echo "$*"
 43 |     echo
 44 |     exit 1
 45 | }
 46 | 
 47 | # OS specific support (must be 'true' or 'false').
 48 | cygwin=false
 49 | msys=false
 50 | darwin=false
 51 | nonstop=false
 52 | case "`uname`" in
 53 |   CYGWIN* )
 54 |     cygwin=true
 55 |     ;;
 56 |   Darwin* )
 57 |     darwin=true
 58 |     ;;
 59 |   MINGW* )
 60 |     msys=true
 61 |     ;;
 62 |   NONSTOP* )
 63 |     nonstop=true
 64 |     ;;
 65 | esac
 66 | 
 67 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 68 | 
 69 | # Determine the Java command to use to start the JVM.
 70 | if [ -n "$JAVA_HOME" ] ; then
 71 |     if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
 72 |         # IBM's JDK on AIX uses strange locations for the executables
 73 |         JAVACMD="$JAVA_HOME/jre/sh/java"
 74 |     else
 75 |         JAVACMD="$JAVA_HOME/bin/java"
 76 |     fi
 77 |     if [ ! -x "$JAVACMD" ] ; then
 78 |         die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
 79 | 
 80 | Please set the JAVA_HOME variable in your environment to match the
 81 | location of your Java installation."
 82 |     fi
 83 | else
 84 |     JAVACMD="java"
 85 |     which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 86 | 
 87 | Please set the JAVA_HOME variable in your environment to match the
 88 | location of your Java installation."
 89 | fi
 90 | 
 91 | # Increase the maximum file descriptors if we can.
 92 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
 93 |     MAX_FD_LIMIT=`ulimit -H -n`
 94 |     if [ $? -eq 0 ] ; then
 95 |         if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
 96 |             MAX_FD="$MAX_FD_LIMIT"
 97 |         fi
 98 |         ulimit -n $MAX_FD
 99 |         if [ $? -ne 0 ] ; then
100 |             warn "Could not set maximum file descriptor limit: $MAX_FD"
101 |         fi
102 |     else
103 |         warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
104 |     fi
105 | fi
106 | 
107 | # For Darwin, add options to specify how the application appears in the dock
108 | if $darwin; then
109 |     GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
110 | fi
111 | 
112 | # For Cygwin, switch paths to Windows format before running java
113 | if $cygwin ; then
114 |     APP_HOME=`cygpath --path --mixed "$APP_HOME"`
115 |     CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
116 |     JAVACMD=`cygpath --unix "$JAVACMD"`
117 | 
118 |     # We build the pattern for arguments to be converted via cygpath
119 |     ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
120 |     SEP=""
121 |     for dir in $ROOTDIRSRAW ; do
122 |         ROOTDIRS="$ROOTDIRS$SEP$dir"
123 |         SEP="|"
124 |     done
125 |     OURCYGPATTERN="(^($ROOTDIRS))"
126 |     # Add a user-defined pattern to the cygpath arguments
127 |     if [ "$GRADLE_CYGPATTERN" != "" ] ; then
128 |         OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
129 |     fi
130 |     # Now convert the arguments - kludge to limit ourselves to /bin/sh
131 |     i=0
132 |     for arg in "$@" ; do
133 |         CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
134 |         CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
135 | 
136 |         if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
137 |             eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
138 |         else
139 |             eval `echo args$i`="\"$arg\""
140 |         fi
141 |         i=$((i+1))
142 |     done
143 |     case $i in
144 |         (0) set -- ;;
145 |         (1) set -- "$args0" ;;
146 |         (2) set -- "$args0" "$args1" ;;
147 |         (3) set -- "$args0" "$args1" "$args2" ;;
148 |         (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
149 |         (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
150 |         (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
151 |         (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
152 |         (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
153 |         (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
154 |     esac
155 | fi
156 | 
157 | # Escape application args
158 | save () {
159 |     for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
160 |     echo " "
161 | }
162 | APP_ARGS=$(save "$@")
163 | 
164 | # Collect all arguments for the java command, following the shell quoting and substitution rules
165 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
166 | 
167 | # by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
168 | if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
169 |   cd "$(dirname "$0")"
170 | fi
171 | 
172 | exec "$JAVACMD" "$@"
173 | 


--------------------------------------------------------------------------------
/gradlew.bat:
--------------------------------------------------------------------------------
 1 | @if "%DEBUG%" == "" @echo off
 2 | @rem ##########################################################################
 3 | @rem
 4 | @rem  Gradle startup script for Windows
 5 | @rem
 6 | @rem ##########################################################################
 7 | 
 8 | @rem Set local scope for the variables with windows NT shell
 9 | if "%OS%"=="Windows_NT" setlocal
10 | 
11 | set DIRNAME=%~dp0
12 | if "%DIRNAME%" == "" set DIRNAME=.
13 | set APP_BASE_NAME=%~n0
14 | set APP_HOME=%DIRNAME%
15 | 
16 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
17 | set DEFAULT_JVM_OPTS=
18 | 
19 | @rem Find java.exe
20 | if defined JAVA_HOME goto findJavaFromJavaHome
21 | 
22 | set JAVA_EXE=java.exe
23 | %JAVA_EXE% -version >NUL 2>&1
24 | if "%ERRORLEVEL%" == "0" goto init
25 | 
26 | echo.
27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
28 | echo.
29 | echo Please set the JAVA_HOME variable in your environment to match the
30 | echo location of your Java installation.
31 | 
32 | goto fail
33 | 
34 | :findJavaFromJavaHome
35 | set JAVA_HOME=%JAVA_HOME:"=%
36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe
37 | 
38 | if exist "%JAVA_EXE%" goto init
39 | 
40 | echo.
41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
42 | echo.
43 | echo Please set the JAVA_HOME variable in your environment to match the
44 | echo location of your Java installation.
45 | 
46 | goto fail
47 | 
48 | :init
49 | @rem Get command-line arguments, handling Windows variants
50 | 
51 | if not "%OS%" == "Windows_NT" goto win9xME_args
52 | 
53 | :win9xME_args
54 | @rem Slurp the command line arguments.
55 | set CMD_LINE_ARGS=
56 | set _SKIP=2
57 | 
58 | :win9xME_args_slurp
59 | if "x%~1" == "x" goto execute
60 | 
61 | set CMD_LINE_ARGS=%*
62 | 
63 | :execute
64 | @rem Setup the command line
65 | 
66 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
67 | 
68 | @rem Execute Gradle
69 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
70 | 
71 | :end
72 | @rem End local scope for the variables with windows NT shell
73 | if "%ERRORLEVEL%"=="0" goto mainEnd
74 | 
75 | :fail
76 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
77 | rem the _cmd.exe /c_ return code!
78 | if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
79 | exit /b 1
80 | 
81 | :mainEnd
82 | if "%OS%"=="Windows_NT" endlocal
83 | 
84 | :omega
85 | 


--------------------------------------------------------------------------------
/settings.gradle:
--------------------------------------------------------------------------------
1 | include ':app'
2 | 


--------------------------------------------------------------------------------