Add a More item for Special app access page.

This allows users to toggle non-exclusive roles, such as the temporary
SMS access (non-exclusive) role.

Bug: 110557011
Test: atest MorePreferenceControllerTest
Change-Id: Id9c0338ef2996aaa741c3da8104e867f32050f3a

src/com/android/settings/applications/specialaccess/MoreSpecialAccessPreferenceController.java

@@ -0,0 +1,64 @@
+/*
+ * 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.applications.specialaccess;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.text.TextUtils;
+
+import androidx.preference.Preference;
+
+import com.android.settings.core.BasePreferenceController;
+
+public class MoreSpecialAccessPreferenceController extends BasePreferenceController {
+
+    private final Intent mIntent;
+
+    public MoreSpecialAccessPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+
+        final PackageManager packageManager = context.getPackageManager();
+        final String packageName = packageManager.getPermissionControllerPackageName();
+        if (packageName != null) {
+            Intent intent = new Intent(Intent.ACTION_MANAGE_SPECIAL_APP_ACCESSES)
+                    .setPackage(packageName);
+            ResolveInfo resolveInfo = packageManager.resolveActivity(intent,
+                    PackageManager.MATCH_DEFAULT_ONLY);
+            mIntent = resolveInfo != null ? intent : null;
+        } else {
+            mIntent = null;
+        }
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return mIntent != null ? AVAILABLE_UNSEARCHABLE : UNSUPPORTED_ON_DEVICE;
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        if (TextUtils.equals(preference.getKey(), mPreferenceKey)) {
+            if (mIntent != null) {
+                mContext.startActivity(mIntent);
+            }
+            return true;
+        }
+        return false;
+    }
+}