Add android.settings.BIOMETRIC_ENROLL action intent

Fixes: 112925362

Test: adb shell am start -a android.settings.BIOMETRIC_ENROLL
Change-Id: I8dc37520b290483dab46cee2f6ca8612f4cf870e

AndroidManifest.xml

@@ -1524,6 +1524,15 @@
             android:exported="false"
             android:screenOrientation="portrait"/>
 
+        <activity android:name=".biometrics.BiometricEnrollActivity"
+            android:exported="true"
+            android:theme="@style/GlifTheme.Light">
+            <intent-filter>
+                <action android:name="android.settings.BIOMETRIC_ENROLL" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+        </activity>
+
         <activity android:name=".biometrics.fingerprint.FingerprintSettings" android:exported="false"/>
         <activity android:name=".biometrics.fingerprint.FingerprintEnrollFindSensor" android:exported="false"/>
         <activity android:name=".biometrics.fingerprint.FingerprintEnrollEnrolling" android:exported="false"/>

src/com/android/settings/biometrics/BiometricEnrollActivity.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.settings.biometrics;
+
+import android.app.settings.SettingsEnums;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.os.Bundle;
+
+import com.android.settings.biometrics.face.FaceEnrollIntroduction;
+import com.android.settings.biometrics.fingerprint.FingerprintEnrollIntroduction;
+import com.android.settings.core.InstrumentedActivity;
+
+/**
+ * Trampoline activity launched by the {@code android.settings.BIOMETRIC_ENROLL} action which
+ * shows the user an appropriate enrollment flow depending on the device's biometric hardware.
+ * This activity must only allow enrollment of biometrics that can be used by
+ * {@link android.hardware.biometrics.BiometricPrompt}.
+ */
+public class BiometricEnrollActivity extends InstrumentedActivity {
+
+    private static final String SETTINGS_PACKAGE = "com.android.settings";
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        final PackageManager pm = getApplicationContext().getPackageManager();
+        final Intent intent = new Intent();
+
+        // This logic may have to be modified on devices with multiple biometrics.
+        if (pm.hasSystemFeature(PackageManager.FEATURE_FINGERPRINT)) {
+            intent.setClassName(SETTINGS_PACKAGE, FingerprintEnrollIntroduction.class.getName());
+        } else if (pm.hasSystemFeature(PackageManager.FEATURE_FACE)) {
+            intent.setClassName(SETTINGS_PACKAGE, FaceEnrollIntroduction.class.getName());
+        }
+
+        startActivity(intent);
+        finish();
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        return SettingsEnums.BIOMETRIC_ENROLL_ACTIVITY;
+    }
+}