在getDrawingCache()之前调用下面的代码
View.measure(
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
View.layout(0, 0, View.getMeasuredWidth(),
View.getMeasuredHeight());
View.buildDrawingCache();
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