AF: Show passwords settings for available autofill service.

Separates autofill preferences into 2 categories - one for the passwords
settings and one for the existing default service preference.

The passwords preference controller dynamically creates preferences for
each autofill service.

Bug: 169455298
Test: manual
Test: TODO new test for controller
Change-Id: I369b5db00be75957c869df4d960595e9e1d9772c

res/values/strings.xml

@@ -11481,8 +11481,10 @@
     <!-- AutoFill strings -->
     <!-- Preference label for choosing auto-fill service. [CHAR LIMIT=60] -->
     <string name="autofill_app">Autofill service</string>
+    <!-- Preference category for showing auto-fill services with saved passwords. [CHAR LIMIT=60] -->
+    <string name="autofill_passwords">Passwords</string>
     <!-- Keywords for the auto-fill feature. [CHAR LIMIT=NONE] -->
-    <string name="autofill_keywords">auto, fill, autofill</string>
+    <string name="autofill_keywords">auto, fill, autofill, password</string>
 
     <!-- Message of the warning dialog for setting the auto-fill app. [CHAR_LIMIT=NONE] -->
     <string name="autofill_confirmation_message">

res/xml/default_autofill_picker_settings.xml

@@ -22,6 +22,18 @@
     android:title="@string/autofill_app"
     settings:keywords="@string/autofill_keywords">
 
+  <PreferenceCategory
+      android:key="passwords_category"
+      android:persistent="false"
+      android:title="@string/autofill_passwords"
+      settings:controller="com.android.settings.applications.autofill.PasswordsPreferenceController" >
+  </PreferenceCategory>
+
+  <PreferenceCategory
+      android:key="default_service_category"
+      android:title="@string/autofill_app">
+
+    <!-- TODO(b/169455298): Fix the redundant title. -->
     <com.android.settings.widget.GearPreference
         android:key="default_autofill_main"
         android:title="@string/autofill_app"
@@ -30,6 +42,7 @@
         settings:keywords="@string/autofill_keywords">
       <extra android:name="for_work" android:value="false" />
     </com.android.settings.widget.GearPreference>
+  </PreferenceCategory>
 
 
   <com.android.settings.widget.WorkOnlyCategory

src/com/android/settings/applications/autofill/PasswordsPreferenceController.java

@@ -0,0 +1,94 @@
+/*
+ * 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.applications.autofill;
+
+import android.annotation.UserIdInt;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ServiceInfo;
+import android.graphics.drawable.Drawable;
+import android.os.UserHandle;
+import android.service.autofill.AutofillServiceInfo;
+import android.text.TextUtils;
+import android.util.IconDrawableFactory;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceGroup;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.Utils;
+import com.android.settings.core.BasePreferenceController;
+
+import java.util.List;
+
+/**
+ * Queries available autofill services and adds preferences for those that declare passwords
+ * settings.
+ */
+public class PasswordsPreferenceController extends BasePreferenceController {
+
+    private final PackageManager mPm;
+    private final IconDrawableFactory mIconFactory;
+    private final List<AutofillServiceInfo> mServices;
+
+    public PasswordsPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+        mPm = context.getPackageManager();
+        mIconFactory = IconDrawableFactory.newInstance(mContext);
+        mServices = AutofillServiceInfo.getAvailableServices(mContext, UserHandle.myUserId());
+        for (int i = mServices.size() - 1; i >= 0; i--) {
+            final String passwordsActivity = mServices.get(i).getPasswordsActivity();
+            if (TextUtils.isEmpty(passwordsActivity)) {
+                mServices.remove(i);
+            }
+        }
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return mServices.isEmpty() ? CONDITIONALLY_UNAVAILABLE : AVAILABLE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        final PreferenceGroup group = screen.findPreference(getPreferenceKey());
+        // TODO(b/169455298): Show work profile passwords too.
+        addPasswordPreferences(screen.getContext(), UserHandle.myUserId(), group);
+    }
+
+    private void addPasswordPreferences(
+            Context prefContext, @UserIdInt int user, PreferenceGroup group) {
+        for (int i = 0; i < mServices.size(); i++) {
+            final AutofillServiceInfo service = mServices.get(i);
+            final Preference pref = new Preference(prefContext);
+            final ServiceInfo serviceInfo = service.getServiceInfo();
+            pref.setTitle(serviceInfo.loadLabel(mPm));
+            final Drawable icon =
+                    mIconFactory.getBadgedIcon(
+                            serviceInfo,
+                            serviceInfo.applicationInfo,
+                            user);
+            Utils.setSafeIcon(pref, icon);
+            pref.setIntent(
+                    new Intent(Intent.ACTION_MAIN)
+                            .setClassName(serviceInfo.packageName, service.getPasswordsActivity()));
+            group.addPreference(pref);
+        }
+    }
+}