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/SimLockPreferenceController.java

@@ -0,0 +1,108 @@
+/*
+ * 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.os.PersistableBundle;
+import android.os.UserManager;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.telephony.CarrierConfigManager;
+import android.telephony.SubscriptionInfo;
+import android.telephony.SubscriptionManager;
+import android.telephony.TelephonyManager;
+
+import com.android.settings.core.BasePreferenceController;
+
+import java.util.List;
+
+public class SimLockPreferenceController extends BasePreferenceController {
+
+    private static final String KEY_SIM_LOCK = "sim_lock_settings";
+
+    private final CarrierConfigManager mCarrierConfigManager;
+    private final UserManager mUserManager;
+    private final SubscriptionManager mSubscriptionManager;
+    private final TelephonyManager mTelephonyManager;
+
+    public SimLockPreferenceController(Context context) {
+        super(context, KEY_SIM_LOCK);
+        mUserManager = (UserManager) context.getSystemService(Context.USER_SERVICE);
+        mCarrierConfigManager = (CarrierConfigManager)
+                mContext.getSystemService(Context.CARRIER_CONFIG_SERVICE);
+        mSubscriptionManager = (SubscriptionManager) context
+                .getSystemService(Context.TELEPHONY_SUBSCRIPTION_SERVICE);
+        mTelephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        final PersistableBundle b = mCarrierConfigManager.getConfig();
+        final boolean IsAdmin = mUserManager.isAdminUser();
+        if (!IsAdmin || !isSimIccReady() ||
+                b.getBoolean(CarrierConfigManager.KEY_HIDE_SIM_LOCK_SETTINGS_BOOL)) {
+            return DISABLED_FOR_USER;
+        }
+        return AVAILABLE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        final Preference preference = screen.findPreference(getPreferenceKey());
+        if (preference == null) {
+            return;
+        }
+        // Disable SIM lock if there is no ready SIM card.
+        preference.setEnabled(isSimReady());
+    }
+
+    /* Return true if a SIM is ready for locking.
+     * TODO: consider adding to TelephonyManager or SubscritpionManasger.
+     */
+    private boolean isSimReady() {
+        final List<SubscriptionInfo> subInfoList =
+                mSubscriptionManager.getActiveSubscriptionInfoList();
+        if (subInfoList != null) {
+            for (SubscriptionInfo subInfo : subInfoList) {
+                final int simState = mTelephonyManager.getSimState(subInfo.getSimSlotIndex());
+                if ((simState != TelephonyManager.SIM_STATE_ABSENT) &&
+                        (simState != TelephonyManager.SIM_STATE_UNKNOWN)) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Return true if a there is a Slot that has Icc
+     */
+    private boolean isSimIccReady() {
+        final List<SubscriptionInfo> subInfoList =
+                mSubscriptionManager.getActiveSubscriptionInfoList();
+
+        if (subInfoList != null) {
+            for (SubscriptionInfo subInfo : subInfoList) {
+                if (mTelephonyManager.hasIccCard(subInfo.getSimSlotIndex())) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+}