使用UiScrollable滑动寻找对象，只滑动一半便提示未找到，求大佬解答

方法：scrollable.getChildByText(new UiSelector().textMatches(".+"),text,true)
异常：android.support.test.uiautomator.UiObjectNotFoundException: for text= "87"
at android.support.test.uiautomator.UiCollection.getChildByText(UiCollection.java:126)
at android.support.test.uiautomator.UiScrollable.getChildByText(UiScrollable.java:215)