Reset activity reference after invalidation

import android.graphics.PointF;

import android.graphics.Rect;

import android.os.Build;

import android.os.Handler;

import android.os.SystemClock;

import android.view.MotionEvent;

import android.view.View;

    protected final BaseActivityInterface<S, T> mActivityInterface;

    protected final InputConsumerProxy mInputConsumerProxy;

    protected final ActivityInitListener mActivityInitListener;

    private final Handler mHandler = new Handler();

    // Callbacks to be made once the recents animation starts

    private final ArrayList<Runnable> mRecentsAnimationStartCallbacks = new ArrayList<>();

    protected RecentsAnimationController mRecentsAnimationController;

        mActivityInitListener.unregister();

        ActivityManagerWrapper.getInstance().unregisterTaskStackListener(mActivityRestartListener);

        mTaskSnapshot = null;

        mHandler.post(() -> {

            // Defer clearing the activity since invalidation can happen over multiple callbacks

            mActivity = null;

        });

    }

    private void invalidateHandlerWithLauncher() {