Stay in face settings unless the user explicitly backs out

Bug: 130898604

Test: Builds
Change-Id: I7159c3a6259d298f78b8328b2c6974ba46fb56f9

src/com/android/settings/biometrics/face/FaceSettingsEnrollButtonPreferenceController.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2019 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.face;
+
+import android.content.Context;
+import android.content.Intent;
+import android.view.View;
+import android.widget.Button;
+
+import androidx.preference.Preference;
+
+import com.android.settings.R;
+import com.android.settings.SettingsActivity;
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.password.ChooseLockSettingsHelper;
+import com.android.settingslib.widget.LayoutPreference;
+
+/**
+ * Preference controller that allows a user to enroll their face.
+ */
+public class FaceSettingsEnrollButtonPreferenceController extends BasePreferenceController
+        implements View.OnClickListener {
+
+    private static final String TAG = "FaceSettings/Remove";
+    static final String KEY = "security_settings_face_enroll_faces_container";
+
+    private int mUserId;
+    private byte[] mToken;
+    private SettingsActivity mActivity;
+    private Button mButton;
+
+    public FaceSettingsEnrollButtonPreferenceController(Context context) {
+        this(context, KEY);
+    }
+
+    public FaceSettingsEnrollButtonPreferenceController(Context context,
+            String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        super.updateState(preference);
+
+        mButton = ((LayoutPreference) preference)
+                .findViewById(R.id.security_settings_face_settings_enroll_button);
+        mButton.setOnClickListener(this);
+    }
+
+    @Override
+    public void onClick(View v) {
+        final Intent intent = new Intent();
+        intent.setClassName("com.android.settings", FaceEnrollIntroduction.class.getName());
+        intent.putExtra(Intent.EXTRA_USER_ID, mUserId);
+        intent.putExtra(ChooseLockSettingsHelper.EXTRA_KEY_CHALLENGE_TOKEN, mToken);
+        mContext.startActivity(intent);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    public void setUserId(int userId) {
+        mUserId = userId;
+    }
+
+    public void setToken(byte[] token) {
+        mToken = token;
+    }
+
+    public void setActivity(SettingsActivity activity) {
+        mActivity = activity;
+    }
+}