我使用AutoCompleteTextView，当用户点击它，我想说明的建议，即使它没有文字 - 但setThreshold（0）的作品完全一样setThreshold（1） - 因此，用户必须输入至少1字符显示的建议。

I am using AutoCompleteTextView , when user clicks on it, I want to show suggestions even if it has no text - but setThreshold(0) works exactly the same as setThreshold(1) - so the user has to enter at least 1 character to show the suggestions.

推荐答案

这是documented行为的：当阈值小于或等于0，1的阈值被施加

This is documented behavior: "When threshold is less than or equals 0, a threshold of 1 is applied.".

您可以手动表明通过 showDropDown下拉（），所以也许你可以安排，以显示它时，你想要的。或者，子类 AutoCompleteTextView 和覆盖 enoughToFilter（），返回真所有时间。

You can manually show the drop-down via showDropDown(), so perhaps you can arrange to show it when you want. Or, subclass AutoCompleteTextView and override enoughToFilter(), returning true all of time.