[Settings] Hide subscriptions not existed within device

For non-active subscriptions, the one inserted in slot
but turned off need to be visible to the user. However,
the one un-plugged need to be invisble.

Since SubscriptionUtil#getSelectableSubscriptionInfoList() didn't cover all the cases required. Create this one to fit into the criteria required here.

Bug: 191228344
Test: local
Change-Id: Ia68c23b007164b7520456cb6c7427ca142558b59

src/com/android/settings/network/helper/QuerySimSlotIndex.java

@@ -0,0 +1,87 @@
+/*
+ * 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.network.helper;
+
+import android.telephony.SubscriptionManager;
+import android.telephony.TelephonyManager;
+import android.telephony.UiccSlotInfo;
+
+import java.util.Arrays;
+import java.util.concurrent.Callable;
+import java.util.concurrent.atomic.AtomicIntegerArray;
+
+/**
+ * This is a Callable class which query slot index within device
+ */
+public class QuerySimSlotIndex implements Callable<AtomicIntegerArray> {
+    private static final String TAG = "QuerySimSlotIndex";
+
+    private TelephonyManager mTelephonyManager;
+    private boolean mDisabledSlotsIncluded;
+    private boolean mOnlySlotWithSim;
+
+    /**
+     * Constructor of class
+     * @param TelephonyManager
+     * @param disabledSlotsIncluded query both active and inactive slots when true,
+     *                              only query active slot when false.
+     * @param onlySlotWithSim query slot index with SIM available when true,
+     *                        include absent ones when false.
+     */
+    public QuerySimSlotIndex(TelephonyManager telephonyManager,
+            boolean disabledSlotsIncluded, boolean onlySlotWithSim) {
+        mTelephonyManager = telephonyManager;
+        mDisabledSlotsIncluded = disabledSlotsIncluded;
+        mOnlySlotWithSim = onlySlotWithSim;
+    }
+
+    /**
+     * Implementation of Callable
+     * @return slot index in AtomicIntegerArray
+     */
+    public AtomicIntegerArray call() {
+        UiccSlotInfo [] slotInfo = mTelephonyManager.getUiccSlotsInfo();
+        if (slotInfo == null) {
+            return new AtomicIntegerArray(0);
+        }
+        int slotIndexFilter = mOnlySlotWithSim ? 0 : SubscriptionManager.INVALID_SIM_SLOT_INDEX;
+        return new AtomicIntegerArray(Arrays.stream(slotInfo)
+                .filter(slot -> filterSlot(slot))
+                .mapToInt(slot -> mapToSlotIndex(slot))
+                .filter(slotIndex -> (slotIndex >= slotIndexFilter))
+                .toArray());
+    }
+
+    protected boolean filterSlot(UiccSlotInfo slotInfo) {
+        if (mDisabledSlotsIncluded) {
+            return true;
+        }
+        if (slotInfo == null) {
+            return false;
+        }
+        return slotInfo.getIsActive();
+    }
+
+    protected int mapToSlotIndex(UiccSlotInfo slotInfo) {
+        if (slotInfo == null) {
+            return SubscriptionManager.INVALID_SIM_SLOT_INDEX;
+        }
+        if (slotInfo.getCardStateInfo() == UiccSlotInfo.CARD_STATE_INFO_ABSENT) {
+            return SubscriptionManager.INVALID_SIM_SLOT_INDEX;
+        }
+        return slotInfo.getLogicalSlotIdx();
+    }
+}