Oh look, GmsCore is using more hidden APIs.

import android.annotation.SdkConstant.SdkConstantType;

import android.annotation.StringRes;

import android.annotation.SystemApi;

import android.annotation.UserIdInt;

import android.annotation.TestApi;

import android.annotation.UserIdInt;

import android.annotation.XmlRes;

import android.app.PackageDeleteObserver;

import android.app.PackageInstallObserver;

import android.os.UserHandle;

import android.os.storage.VolumeInfo;

import android.util.AndroidException;

import android.util.Log;

import com.android.internal.util.ArrayUtils;

 * You can find this class through {@link Context#getPackageManager}.

 */

public abstract class PackageManager {

    private static final String TAG = "PackageManager";

    /**

     * This exception is thrown when a given package, application, or component

    public abstract List<ResolveInfo> queryBroadcastReceiversAsUser(Intent intent,

            @ResolveInfoFlags int flags, @UserIdInt int userId);

    /** {@hide} */

    @Deprecated

    public List<ResolveInfo> queryBroadcastReceivers(Intent intent,

            @ResolveInfoFlags int flags, @UserIdInt int userId) {

        Log.w(TAG, "STAHP USING HIDDEN APIS KTHX");

        return queryBroadcastReceiversAsUser(intent, flags, userId);

    }

    /**

     * Determine the best service to handle for a given Intent.

     *

     *             but the older observer interface will not get additional

     *             failure details.

     */

    // @SystemApi

    public abstract void installPackage(

            Uri packageURI, IPackageInstallObserver observer, int flags,

            String installerPackageName);

     *             continue to be supported but the older observer interface

     *             will not get additional failure details.

     */

    // @SystemApi

    public abstract void installPackageWithVerification(Uri packageURI,

            IPackageInstallObserver observer, int flags, String installerPackageName,

            Uri verificationURI,

     * on the system for other users, also install it for the calling user.

     * @hide

     */

    // @SystemApi

    public abstract int installExistingPackage(String packageName) throws NameNotFoundException;

    /**