Combined biometric settings implementation

There will be multiple biometrics authentications existing at the same
time, so we added a new page for multiple biometrics to control
biometrics settings.

Bug: 183449119
Test: manual test
Change-Id: I359082caf771e07dfd5b24973cb8a3cf372c1b30

src/com/android/settings/biometrics/combination/BiometricSettingsAppPreferenceController.java

@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2021 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.combination;
+
+import static android.provider.Settings.Secure.BIOMETRIC_APP_ENABLED;
+
+import android.app.admin.DevicePolicyManager;
+import android.content.Context;
+import android.hardware.face.FaceManager;
+import android.hardware.fingerprint.FingerprintManager;
+import android.provider.Settings;
+
+import com.android.settings.Utils;
+import com.android.settings.core.TogglePreferenceController;
+import com.android.settingslib.RestrictedLockUtils.EnforcedAdmin;
+import com.android.settingslib.RestrictedLockUtilsInternal;
+
+/**
+ * Preference controller that controls whether the biometrics authentication to be used in apps.
+ */
+public class BiometricSettingsAppPreferenceController extends TogglePreferenceController {
+    private static final int ON = 1;
+    private static final int OFF = 0;
+    private static final int DEFAULT = ON;
+
+    private int mUserId;
+    private FaceManager mFaceManager;
+    private FingerprintManager mFingerprintManager;
+
+    public BiometricSettingsAppPreferenceController(Context context, String key) {
+        super(context, key);
+        mFaceManager = Utils.getFaceManagerOrNull(context);
+        mFingerprintManager = Utils.getFingerprintManagerOrNull(context);
+    }
+
+    protected EnforcedAdmin getRestrictingAdmin() {
+        return RestrictedLockUtilsInternal.checkIfKeyguardFeaturesDisabled(mContext,
+                DevicePolicyManager.KEYGUARD_DISABLE_BIOMETRICS, mUserId);
+    }
+
+    public void setUserId(int userId) {
+        mUserId = userId;
+    }
+
+    @Override
+    public boolean isChecked() {
+        return Settings.Secure.getIntForUser(mContext.getContentResolver(), BIOMETRIC_APP_ENABLED,
+                DEFAULT, mUserId) == ON;
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        return Settings.Secure.putIntForUser(mContext.getContentResolver(), BIOMETRIC_APP_ENABLED,
+                isChecked ? ON : OFF, mUserId);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        if (mFaceManager == null || mFingerprintManager == null) {
+            return AVAILABLE_UNSEARCHABLE;
+        }
+        // This preference will be available only if the user has registered either face auth
+        // or fingerprint.
+        final boolean hasFaceEnrolledUser = mFaceManager.hasEnrolledTemplates(mUserId);
+        final boolean hasFingerprintEnrolledUser =
+                mFingerprintManager.hasEnrolledTemplates(mUserId);
+        if (hasFaceEnrolledUser || hasFingerprintEnrolledUser) {
+            return AVAILABLE;
+        } else {
+            return AVAILABLE_UNSEARCHABLE;
+        }
+    }
+}