今天自定義Recycleview時，呼叫

adapter.notifyDataSetChanged();

報異常，異常資訊如下：

 java.lang.IllegalStateException: View with id 2131230785: com.example.smartcity.widget.viewpageRecycleview.PageRecyclerView#onMeasure() did not set the measured dimension by calling setMeasuredDimension()

解決方法：在onMeasure()裡新增：setMeasuredDimension（）

 @Override
    protected void onMeasure(int widthSpec, int heightSpec) {
        setMeasuredDimension(widthSpec, heightSpec);
        super.onMeasure(widthSpec, heightSpec);
        shortestDistance = getMeasuredWidth() / 3;
    }