问使用onItemLongclick的GestureDetector

EN

    @Override public boolean onTouchEvent(MotionEvent event) {
        int action = event.getActionMasked();
        if (action != MotionEvent.ACTION_UP && action != MotionEvent.ACTION_CANCEL) {
            int N = event.getHistorySize();
            int P = event.getPointerCount();
            for (int i = 0; i < N; i++) {
                for (int j = 0; j < P; j++) {
                    mCurX = event.getHistoricalX(j, i);
                    mCurY = event.getHistoricalY(j, i);
                    drawPoint(mCurX, mCurY,
                            event.getHistoricalPressure(j, i),
                            event.getHistoricalTouchMajor(j, i));
                }
            }
            for (int j = 0; j < P; j++) {
                mCurX = event.getX(j);
                mCurY = event.getY(j);
                drawPoint(mCurX, mCurY, event.getPressure(j), event.getTouchMajor(j));
            }
        }
        return true;
    }