Android P support

app/build.gradle

@@ -1,15 +1,15 @@
 apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion "25.0.0"
+    compileSdkVersion 28
     defaultConfig {
         applicationId "com.fingerprint.authentication"
-        minSdkVersion 23
-        targetSdkVersion 25
+        minSdkVersion 19
+        targetSdkVersion 28
         versionCode 1
         versionName "1.0"
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
         release {
@@ -20,10 +20,9 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
-    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
-        exclude group: 'com.android.support', module: 'support-annotations'
-    })
-    compile 'com.android.support:appcompat-v7:25.2.0'
-    testCompile 'junit:junit:4.12'
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'com.android.support:appcompat-v7:28.0.0'
+
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+    implementation "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
 }

app/src/main/AndroidManifest.xml

@@ -2,6 +2,10 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.fingerprint.authentication">
 
+    <!-- Step 1: Add the following permission to the app  -->
+    <uses-permission android:name="android.permission.USE_BIOMETRIC" />
+
+    <!-- Step 2: This permission is depreciated in Android P  -->
     <uses-permission android:name="android.permission.USE_FINGERPRINT" />
 
     <application
@@ -10,7 +14,8 @@
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name=".FingerprintActivity"
+        <activity
+            android:name=".FingerprintActivity"
             android:screenOrientation="portrait">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -19,7 +24,9 @@
             </intent-filter>
         </activity>
 
-
+        <activity
+            android:name=".MainActivity"
+            android:screenOrientation="portrait" />
     </application>
 
 </manifest>

app/src/main/java/com/fingerprint/authentication/BiometricUtils.kt

@@ -0,0 +1,56 @@
+package com.fingerprint.authentication
+
+import android.Manifest
+import android.content.Context
+import android.content.pm.PackageManager
+import android.os.Build
+import android.support.v4.app.ActivityCompat
+import android.support.v4.hardware.fingerprint.FingerprintManagerCompat
+
+object BiometricUtils {
+
+
+    val isBiometricPromptEnabled = Build.VERSION.SDK_INT > Build.VERSION_CODES.M
+
+
+    /*
+     * Condition I: Check if the android version in device is greater than
+     * Marshmallow, since fingerprint authentication is only supported
+     * from Android 6.0.
+     * Note: If your project's minSdkversion is 23 or higher,
+     * then you won't need to perform this check.
+     *
+     * */
+    val isSdkVersionSupported = Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
+
+
+    /*
+     * Condition II: Check if the device has fingerprint sensors.
+     * Note: If you marked android.hardware.fingerprint as something that
+     * your app requires (android:required="true"), then you don't need
+     * to perform this check.
+     *
+     * */
+    fun isHardwareSupported(context: Context) = FingerprintManagerCompat.from(context).isHardwareDetected
+
+
+    /*
+     * Condition III: Fingerprint authentication can be matched with a
+     * registered fingerprint of the user. So we need to perform this check
+     * in order to enable fingerprint authentication
+     *
+     * */
+    fun isFingerprintAvailable(context: Context) = FingerprintManagerCompat.from(context).hasEnrolledFingerprints()
+
+
+    /*
+     * Condition IV: Check if the permission has been added to
+     * the app. This permission will be granted as soon as the user
+     * installs the app on their device.
+     *
+     * */
+    fun isPermissionGranted(context: Context): Boolean {
+        return ActivityCompat.checkSelfPermission(context, Manifest.permission.USE_FINGERPRINT) == PackageManager.PERMISSION_GRANTED
+    }
+
+}

app/src/main/java/com/fingerprint/authentication/FingerprintActivity.kt

@@ -0,0 +1,31 @@
+package com.fingerprint.authentication
+
+import android.content.Intent
+import android.graphics.Color
+import android.os.Bundle
+import android.support.v7.app.AppCompatActivity
+import android.widget.Toast
+import kotlinx.android.synthetic.main.activity_fingerprint.*
+
+class FingerprintActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_fingerprint)
+        initTouchAuth()
+    }
+
+    private fun initTouchAuth() {
+        val handler = FingerprintHandler(this)
+        handler.initTouchAuth { code, message ->
+            if (handler.isSuccess(code)) {
+                Toast.makeText(this, message, Toast.LENGTH_LONG).show()
+                startActivity(Intent(this, MainActivity::class.java))
+                finish()
+            } else {
+                errorText.setTextColor(Color.RED)
+                errorText.text = message
+            }
+        }
+    }
+}