Cancelling long press on workspace if touch point moves a lot

import static android.view.MotionEvent.ACTION_CANCEL;

import static android.view.MotionEvent.ACTION_DOWN;

import static android.view.MotionEvent.ACTION_MOVE;

import static android.view.MotionEvent.ACTION_POINTER_UP;

import static android.view.MotionEvent.ACTION_UP;

import static android.view.ViewConfiguration.getLongPressTimeout;

import android.view.MotionEvent;

import android.view.View;

import android.view.View.OnTouchListener;

import android.view.ViewConfiguration;

import com.android.launcher3.AbstractFloatingView;

import com.android.launcher3.CellLayout;

    private final Launcher mLauncher;

    private final Workspace mWorkspace;

    private final PointF mTouchDownPoint = new PointF();

    private final float mTouchSlop;

    private int mLongPressState = STATE_CANCELLED;

    public WorkspaceTouchListener(Launcher launcher, Workspace workspace) {

        mLauncher = launcher;

        mWorkspace = workspace;

        // Use twice the touch slop as we are looking for long press which is more

        // likely to cause movement.

        mTouchSlop = 2 * ViewConfiguration.get(launcher).getScaledTouchSlop();

    }

    @Override

            mWorkspace.onTouchEvent(ev);

            if (mWorkspace.isHandlingTouch()) {

                cancelLongPress();

            } else if (action == ACTION_MOVE && PointF.length(

                    mTouchDownPoint.x - ev.getX(), mTouchDownPoint.y - ev.getY()) > mTouchSlop) {

                cancelLongPress();

            }

            result = true;