Convert some security setting logic to PreferenceController

- Manage trust agent
- Show password
- Sim lock
- Screen pinning

Bug: 32953042
Test: robotests
Change-Id: I0c781a505238cae7a6643b701b750ca63a87a8a5

src/com/android/settings/security/ScreenPinningPreferenceController.java

@@ -0,0 +1,56 @@
+/*
+ * 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.security;
+
+import android.content.Context;
+import android.provider.Settings;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+public class ScreenPinningPreferenceController extends BasePreferenceController {
+
+    private static final String KEY_SCREEN_PINNING = "screen_pinning_settings";
+
+    public ScreenPinningPreferenceController(Context context) {
+        super(context, KEY_SCREEN_PINNING);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        final Preference preference = screen.findPreference(getPreferenceKey());
+        if (preference == null) {
+            return;
+        }
+        if (Settings.System.getInt(mContext.getContentResolver(),
+                Settings.System.LOCK_TO_APP_ENABLED, 0) != 0) {
+            preference.setSummary(
+                    mContext.getString(R.string.switch_on_text));
+        } else {
+            preference.setSummary(
+                    mContext.getString(R.string.switch_off_text));
+        }
+    }
+}