Add getAllCollapsedRatTypes to NetworkTemplate

import static android.net.NetworkStats.ROAMING_YES;

import static android.net.wifi.WifiInfo.sanitizeSsid;

import android.annotation.NonNull;

import android.annotation.Nullable;

import android.compat.annotation.UnsupportedAppUsage;

import android.os.Parcel;

import java.io.DataOutputStream;

import java.io.IOException;

import java.util.Arrays;

import java.util.Collection;

import java.util.HashSet;

import java.util.List;

import java.util.Objects;

        }

    }

    /**

     * Return all supported collapsed RAT types that could be returned by

     * {@link #getCollapsedRatType(int)}.

     */

    @NonNull

    public static final int[] getAllCollapsedRatTypes() {

        final int[] ratTypes = TelephonyManager.getAllNetworkTypes();

        final HashSet<Integer> collapsedRatTypes = new HashSet<>();

        for (final int ratType : ratTypes) {

            collapsedRatTypes.add(NetworkTemplate.getCollapsedRatType(ratType));

        }

        // Ensure that unknown type is returned.

        collapsedRatTypes.add(TelephonyManager.NETWORK_TYPE_UNKNOWN);

        return toIntArray(collapsedRatTypes);

    }

    @NonNull

    private static int[] toIntArray(@NonNull Collection<Integer> list) {

        final int[] array = new int[list.size()];

        int i = 0;

        for (final Integer item : list) {

            array[i++] = item;

        }

        return array;

    }

    /**

     * Check if matches Wi-Fi network template.

     */