Hide overlay windows in VR mode

 */

package com.android.server.vr;

import android.app.AppOpsManager;

import android.content.Context;

import android.content.Intent;

import android.content.pm.PackageManager;

import android.os.Binder;

import android.os.IBinder;

import android.os.UserHandle;

import android.util.ArraySet;

import android.util.Slog;

    private static native void setVrModeNative(boolean enabled);

    private final Object mLock = new Object();

    private final IBinder mOverlayToken = new Binder();

    private boolean mVrModeEnabled = false;

    private ArraySet<VrStateListener> mListeners = new ArraySet<>();

                // Log mode change event.

                Slog.i(TAG, "VR mode " + ((mVrModeEnabled) ? "enabled" : "disabled"));

                setVrModeNative(mVrModeEnabled);

                updateOverlayStateLocked();

                onVrModeChangedLocked();

            }

        }

    }

    private void updateOverlayStateLocked() {

        final long identity = Binder.clearCallingIdentity();

        try {

            AppOpsManager appOpsManager = getContext().getSystemService(AppOpsManager.class);

            if (appOpsManager != null) {

                appOpsManager.setUserRestriction(AppOpsManager.OP_SYSTEM_ALERT_WINDOW,

                        mVrModeEnabled, mOverlayToken);

            }

        } finally {

            Binder.restoreCallingIdentity(identity);

        }

    }

    private boolean getVrMode() {

        synchronized (mLock) {

            return mVrModeEnabled;